A copy machine based on an integrated seamless scanning camera and a method of using the same

Abstract

The present application relates to a kind of based on integrated seamless scanning camera's copy machine and its use method, the copy machine includes rack, object platform, side shift device, screw device, upper and lower scanning components and background controller, wherein upper and lower scanning components are respectively arranged in the upper and lower sides of object platform, and scanning is realized by side shift and lifting.The background controller controls the cooperative action of component according to scanning mode, and image is collected and handled.The method includes system self-checking, pre-analysis, scanning mode selection, light source and camera configuration, image acquisition, local enhancement, image stitching and output etc..By introducing image registration, weighted fusion, error judgment etc., the accuracy and quality of scanning image are improved, and efficient scanning and restoration of complex or large material are realized.The scheme is compact in structure, high in imaging accuracy, and suitable for printing plate making, industrial image acquisition etc.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of copying equipment, and in particular relates to a copying machine based on an integrated seamless scanning camera, which is especially suitable for scenes of high-precision identification and editing of product patterns and shapes, and can be widely applied to the copying needs of complex products in the textile, leather, packaging, electronics, building materials and other industries. BACKGROUND

[0002] In the prior art, traditional copying machines mainly rely on single contour identification technology, which usually uses simple image acquisition equipment and can only obtain the external contour information of the product. Such copying machines have significant limitations: they cannot effectively identify the patterns and shapes in the middle of the product, resulting in a lack of sufficient detailed information for subsequent graphic editing operations, making it difficult to meet the needs of complex product design and processing.

[0003] For example, in the textile, leather, packaging and other industries, the product surface often has rich patterns and fine shape structures, and the traditional copying machine cannot accurately obtain these information, resulting in a large difference between the copied graphics and the original product, reducing the copying efficiency and quality, and increasing the workload and cost of manual post-processing.

[0004] In addition, the traditional equipment adopts a single scanning and light source layout at the top, and when dealing with special materials such as transparent, semi-transparent and high-reflective materials, it is easy to have problems such as blurred imaging and glare interference, and the use effect is greatly reduced. SUMMARY

[0005] The present application aims to provide a copying machine based on an integrated seamless scanning camera, which solves the problems of the prior art through the following technical innovations: an integrated seamless scanning camera is introduced, breaking through the limitation of traditional equipment that can only identify contours, achieving accurate identification of patterns and shapes in the middle of the product, and providing comprehensive data support for graphic editing; a multi-mode scanning and light source coordination scheme is designed to adapt to special materials such as transparent, semi-transparent and high-reflective materials, improving the copying effect of complex materials; through automatic adjustment and intelligent algorithms, the copying efficiency and quality are improved, the cost of manual intervention is reduced, and the needs of various industries are met.

[0006] To solve the above technical problems, the technical scheme of the present application provides a copying machine based on an integrated seamless scanning camera, which comprises:

[0007] a rack;

[0008] an object platform fixed on the rack;

[0009] a side shift device movably connected at the length direction position of the rack;

[0010] a lead screw device installed in the side shift device along the up-down movement direction;

[0011] a scanning assembly connected to the side shifting device through the lead screw device, located above and below the object platform and capable of moving closer to or further away from the object platform through the lead screw device, the scanning assembly comprising an external light source device; and

[0012] a background controller in communication connection with the side shifting device, the lead screw device and the scanning assembly respectively; wherein

[0013] the background controller controls the side shifting device to move along the length direction of the object platform and controls the scanning assembly to move in the up-down direction to move closer to or further away from the object platform, while providing light source in the scanning direction to simultaneously scan the face or the face and back of the object placed on the object platform and obtain the scanning image; and the background controller also controls the light illumination angle of the external light source device to the object platform.

[0014] Optionally, the side shifting device comprises:

[0015] a pair of side plates, respectively connected to the tracks on both sides of the width direction of the rack;

[0016] a synchronous beam, the two ends of which are respectively connected to the inner bottom of a pair of the side plates; and

[0017] a pair of side shifting lead screw groups, respectively arranged at the connection between the side plates and the rack; wherein

[0018] the side shifting lead screw groups control a pair of the side plates to move synchronously through the synchronous beam.

[0019] Optionally, the number of the lead screw devices is two groups, respectively arranged on the inner side surface of the side plates, and each of the lead screw devices comprises an upper lead screw device and a lower lead screw device which are vertically and coaxially distributed, have the same structure and are oppositely symmetrically arranged, the upper lead screw device and the lower lead screw device each comprise a lead screw, a lead screw motor, a lead screw fixed block and a lead screw sliding rail arranged in a traditional way, the lead screw motor controls the rotation of the lead screw and drives the lead screw fixed block to move back and forth along the length direction of the lead screw with the lead screw sliding rail as the guide; and each of the lead screw fixed blocks is connected to a camera fixed plate for connecting the scanning assembly.

[0020] Optionally, the scanning assembly comprises:

[0021] an integrated scanning camera, the two ends of which are respectively connected to the corresponding camera fixed plates in a pair of the side plates, for scanning the object placed on the object platform and obtaining the scanning image;

[0022] The external light source device is connected to the corresponding camera fixing plate in a pair of side plates through a light source moving screw rod group at both ends, used to provide light source for the scanned object on the object platform, and the light source irradiation direction points to the scanning area of the integrated scanning camera.

[0023] Optionally, the integrated scanning camera includes an upper scanning camera and a lower scanning camera with the same structure and opposite installation methods, and each end is connected between a pair of the upper screw rod device and a pair of the lower screw rod device, and the upper scanning camera and the lower scanning camera each include:

[0024] The camera profile is in the shape of a long rectangular cabinet with an element containing cavity and a lens containing cavity inside, and an opening is formed at the top and the bottom of the lens containing cavity;

[0025] The camera back plate covers and seals the opening at the top of the camera profile;

[0026] The chip is horizontally arranged in the lens containing cavity and close to the camera back plate;

[0027] The glass plate covers and seals the opening at the bottom of the lens containing cavity;

[0028] The seamless lens is arranged vertically in the lens containing cavity along the length direction of the camera profile and contacts the glass plate, and is located below the chip; and

[0029] A pair of camera light source plates are arranged in the lens containing cavity along the length direction of the camera profile and are symmetrically distributed on both sides of the seamless lens, and the light source is inclined downwardly towards the glass plate; wherein

[0030] The glass plate is towards the object platform.

[0031] Optionally, the number of the external light source device is two groups, and is arranged in a triangular shape between a pair of the camera fixing plates with the integrated scanning camera, and the two external light source devices are located on one side of the glass plate of the integrated scanning camera, and the light source irradiation direction of the two external light source devices points to the scanning area of the integrated scanning camera, and each external light source device includes:

[0032] The housing is in the shape of a long rectangular cabinet with an open bottom;

[0033] The cover plate covers and seals the opening at the bottom of the housing;

[0034] The light source fixing shaft is located in the housing;

[0035] The rotating shaft is formed at both ends of the light source fixing shaft and is rotatably arranged at the inner side of both ends of the length direction of the housing; and

[0036] A light source plate is fixed on the light source fixing shaft and generally faces the cover plate.

[0037] The shell is provided with a rotating shaft seat at the position connected with the rotating shaft, and the driving motor connected with the rotating shaft is arranged in the rotating shaft seat. The driving motor controls the rotation of the rotating shaft and drives the rotation of the light source fixing shaft, and controls the turning direction of the light source plate to adjust the light irradiation angle of the external light source device to the object platform.

[0038] To solve the above technical problems, the technical scheme of the present application also provides a use method of a copy machine based on an integrated seamless scanning camera, which comprises the following steps:

[0039] Step 1: start the copy machine, trigger the system self-checking program and move the scanning assembly to the initial position;

[0040] Step 2: perform material pre-analysis on the to-be-scanned object placed on the object platform, preliminarily collect images and generate a pre-analysis result;

[0041] Step 3: select a matched scanning mode according to the pre-analysis result, and identify fine areas in the image;

[0042] Step 4: configure the height parameters and light source parameters of the upper scanning camera and the lower scanning camera according to the scanning mode;

[0043] Step 5: control the side shifting device to drive the upper scanning camera and the lower scanning camera to move along the object platform, and perform image collection;

[0044] Step 6: when scanning to the fine area, automatically switch to a local enhanced scanning mode;

[0045] Step 7: after completing the scanning, perform image data processing, including error analysis, position correction, image fusion, and generate an image file;

[0046] Step 8: save the image file and perform system reset before shutdown.

[0047] Optionally, in the step of configuring the light source parameters, the light source compensation displacement is calculated by the formula:

[0048]

[0049] The light source compensation displacement is used to adjust the irradiation center position, so that the light source position is aligned with the target area, thereby improving the uniformity of image collection;

[0050] Wherein:

[0051] is the light source synchronous displacement compensation amount;

[0052] Speed-compensation coefficient;

[0053] This represents the distance the side panel moves.

[0054] Optionally, during image processing in step 7, the following formula is used:

[0055]

[0056] The system performs coordinate correction on the image frames;

[0057] in:

[0058] These are the pixel coordinates of the lower surface after the transformation;

[0059] This is the scaling factor;

[0060] These are the rotation and shear coefficients;

[0061] This is the translation amount;

[0062] And through the formula:

[0063]

[0064] Calculate the mean error after mapping image points;

[0065] in:

[0066] This represents the average distance error.

[0067] This represents the total number of matching homogeneous feature points;

[0068] For the upper surface Coordinates of one feature point;

[0069] To align the lower surface of the first Coordinates of one feature point;

[0070] To determine the matching accuracy before image stitching or fusion.

[0071] Optionally, when the mean image error meets a set threshold, the system performs weighted fusion on adjacent image frames, and the fusion weight is calculated from the scan position using the following formula:

[0072] ;

[0073] ;

[0074] wherein:

[0075] is the weight of the previous frame;

[0076] is the weight of the next frame;

[0077] x is the horizontal coordinate of the pixel in the overlapping region;

[0078] is the starting and ending horizontal coordinate of the overlapping region;

[0079] The final fused image is obtained by the following formula:

[0080]

[0081] wherein:

[0082] is the gray value of the fused pixel;

[0083] are the gray values of the corresponding pixels of the previous frame and the next frame respectively;

[0084] The fusion strategy can realize seamless transition and brightness balance of the image.

[0085] The beneficial effects of the technical scheme of the present application are:

[0086] The upper lead screw module of the copying machine extends to below the upper end surface of the object platform, and the lower lead screw module extends to above the lower end surface of the object platform, so that the upper and lower scanning cameras can break through the "platform boundary limitation" to realize close-range scanning, adapt to thin film materials with a thickness of 0.1 mm and plate materials with a thickness of 50 mm, solve the problems of "thin material scanning blur and thick material coverage" caused by insufficient stroke of traditional equipment, and improve the scanning thickness adaptation range by more than 2 times.

[0087] The integrated scanning camera of the copying machine extends along the left-right horizontal direction and is fixed at both ends, compared with the traditional spliced camera, the "scanning fault" caused by the splicing gap is avoided; meanwhile, the scanning reference lines of the upper and lower cameras are collinear, the spatial correspondence of the upper and lower surface images is improved when scanning from both sides, the subsequent data comparison efficiency is improved by 40%, and the copying machine is especially suitable for the scene of "upper and lower surface correlation detection" of composite materials.

[0088] When the copying machine scans from both sides, the side plate drives the upper and lower cameras and the light source to move synchronously, so that it is not necessary to scan the upper and lower surfaces twice, and the scanning efficiency is improved by 1 times; meanwhile, the system automatically completes image splicing, noise reduction and alignment, and avoids the time-consuming and error of traditional manual processing. BRIEF DESCRIPTION OF DRAWINGS

[0089] Figure 1 is a perspective view of the copy machine in an embodiment of the present application;

[0090] Figure 2 is a sectional view of the copy machine in an embodiment of the present application;

[0091] Figure 3 is a perspective view of the scanning camera in an embodiment of the present application;

[0092] Figure 4 is a sectional view of the scanning camera in an embodiment of the present application;

[0093] Figure 5 is a perspective view of the external light source device in an embodiment of the present application;

[0094] Figure 6 is a sectional view of the external light source device in an embodiment of the present application;

[0095] Figure 7 is a flow chart of the method for using the copy machine in an embodiment of the present application. DETAILED DESCRIPTION

[0096] The present application will be further described below in conjunction with the drawings and specific embodiments, but is not limited by the same.

[0097] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0098] In addition, the terms "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0099] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly interpreted, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0100] In the present application, unless specifically defined and limited otherwise, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "under", "below" and "below" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0101] Please refer to Figure 1 and Figure 2 It is shown that a copy machine based on an integrated seamless scanning camera is shown, which comprises:

[0102] The rack 1;

[0103] The object platform 3 is fixed on the rack 1 by the platform fixing frame 2;

[0104] The side shift device 4 is movably connected at the length direction position of the rack 1;

[0105] The lead screw device 6 is installed in the side shift device 4 along the up and down movement direction;

[0106] The scanning assembly 7 is connected to the side shift device 4 through the lead screw device 6, and is located above and below the object platform 3, and can be close to or away from the object platform 3 through the lead screw device 6, and the scanning assembly comprises an external light source device 72; and

[0107] The background controller (not shown) is respectively in communication connection with the side shift device 4, the lead screw device 6 and the scanning assembly 7, or is electrically connected through the control line; wherein

[0108] The background controller controls the lateral movement device 4 to move along the length of the object platform 3, and controls the scanning component 7 to move in the vertical direction to get closer to or away from the object platform 3. At the same time, it provides a light source in the scanning direction to scan the face or face and back of the object to be scanned placed on the object platform 3 and obtain a scanned image. The background controller also controls the illumination angle of the external light source device on the object platform.

[0109] In this embodiment, the lateral displacement device 4 includes:

[0110] A pair of side plates 41 are slidably connected to the rails 11 on both sides of the frame 1 in the width direction;

[0111] Synchronous beam 42, with its two ends respectively connected to the inner bottom of a pair of side plates 41; and

[0112] A pair of lateral lead screw assemblies 43 are respectively disposed at the connection between the side plate 41 and the track 11 of the frame 1; wherein

[0113] The lateral lead screw assembly 43 controls a pair of side plates 41 to move synchronously through the synchronous beam 42.

[0114] In this embodiment, there are two sets of lead screw devices 6, which are respectively arranged on the inner surface of the side plate 41. Each set of lead screw devices 6 includes an upper lead screw device and a lower lead screw device (e.g., vertically coaxially distributed, identical in structure, and relatively symmetrically arranged) that are vertically coaxially distributed. Figure 2 As shown, the lead screw device 6 includes two lead screw structures that are identical and symmetrically installed (upper and lower). Both the upper and lower lead screw devices include a lead screw 61, a lead screw motor 62, a lead screw fixing block 63, and a lead screw slide rail 64 arranged in a conventional manner. The lead screw motor 62 controls the rotation of the lead screw 61 and drives the lead screw fixing block 63 to move back and forth along the length direction of the lead screw 61 with the lead screw slide rail 64 as a guide. Each lead screw fixing block 63 is connected to a camera fixing plate 5 for connecting the scanning assembly 7.

[0115] In this embodiment, the scanning component 7 includes:

[0116] An integrated scanning camera 71 is connected at both ends to corresponding camera mounting plates 5 in a pair of side plates 41, and is used to scan the object to be scanned on the object platform 3 and acquire scanned images.

[0117] The external light source device 72 is connected at both ends to the corresponding camera fixing plate 5 in a pair of side plates 41 via a light source moving lead screw assembly (a common lead screw structure with the same structure as the lead screw device 6, which is not shown in the figure due to its small size, but does not affect the understanding of those skilled in the art). It is used to provide light source to the object to be scanned on the object platform 3, and the light source illumination direction is directed towards the scanning area of ​​the integrated scanning camera 71.

[0118] In this embodiment, asFigure 3 and Figure 4 As shown, the integrated scanning camera 71 includes an upper scanning camera and a lower scanning camera with identical structures and opposite mounting methods, and each of their ends is connected between a pair of upper lead screw devices and a pair of lower lead screw devices, respectively. Both the upper and lower scanning cameras include:

[0119] The camera profile 711 is a long rectangular cabinet with an internal component receiving cavity A and a lens receiving cavity B, and an opening C is formed at the top of the camera profile 711 and the bottom of the lens receiving cavity B.

[0120] Camera backplate 712 covers and seals the opening C at the top of camera profile 711;

[0121] Chip 713 is horizontally disposed in the lens receiving cavity B and close to the camera back plate 712;

[0122] Glass plate 714 covers and seals the opening C at the bottom of the lens receiving cavity B;

[0123] A seamless lens 715 is disposed perpendicularly to the length of the camera profile 711 within the lens housing B and contacts the glass plate 714, located below the chip 713; and

[0124] A pair of camera light source plates 716 are disposed in the lens receiving cavity B along the length of the camera profile 711 and are obliquely and symmetrically distributed on both sides of the seamless lens 715, with the light sources tilted downwards toward the glass plate 714; wherein

[0125] The glass plate 714 faces the object platform.

[0126] In this embodiment, as Figure 5 and Figure 6 As shown, there are two sets of external light source devices 72, which are arranged in a triangular pattern with the integrated scanning camera 71 between a pair of camera mounting plates 5 (e.g., Figure 2 As shown), the two external light source devices 72 are located on one side of the glass plate 714 of the integrated scanning camera 71, and the light source illumination direction of the two external light source devices 72 is the same, pointing towards the scanning area of ​​the integrated scanning camera 71. Each external light source device 72 includes:

[0127] The housing 721 is a long rectangular cabinet with an opening at the bottom D;

[0128] Cover plate 722 covers and seals the opening D at the bottom of housing 721;

[0129] The light source fixing shaft 723 is located in the housing 721;

[0130] Rotating shafts 724 are formed at both ends of the light source fixing shaft 723, and are rotatably disposed on the inner sides of both ends of the housing 721 along its length; and

[0131] The light source plate 725 is fixed on the light source fixing shaft 723 and generally faces the cover plate 722.

[0132] The shell 721 is provided with a rotating shaft seat 726 at the position connected with the rotating shaft 724, and the driving motor (hidden in the rotating shaft seat 726, not shown) connected with the rotating shaft 724 is arranged in the rotating shaft seat 726. The driving motor controls the rotation of the rotating shaft 724 and drives the light source fixing shaft 723 to rotate, so as to control the turning direction of the light source plate 725 to adjust the light illumination angle of the external light source device 72 to the object platform 3.

[0133] To solve the above technical problems, as shown in Figure 7 The technical scheme of the present application also provides a use method of the copy machine based on the integrated seamless scanning camera, which comprises the following steps:

[0134] Step 1: Start the copy machine, trigger the system self-checking program and move the scanning assembly to the initial position;

[0135] Step 2: Perform material pre-analysis on the to-be-scanned object placed on the object platform, preliminarily collect images and generate a pre-analysis result;

[0136] Step 3: Select a matched scanning mode according to the pre-analysis result and identify the fine area in the image;

[0137] Step 4: Configure the height parameters and light source parameters of the upper scanning camera and the lower scanning camera according to the scanning mode;

[0138] Step 5: Control the side shifting device to drive the upper scanning camera and the lower scanning camera to move along the object platform and perform image collection;

[0139] Step 6: When scanning to the fine area, automatically switch to the local enhanced scanning mode;

[0140] Step 7: After completing the scanning, perform image data processing, including error analysis, position correction, image fusion and generation of an image file;

[0141] Step 8: Save the image file and perform system reset before shutdown.

[0142] In the embodiment, when the light source parameters are configured in step 4, the light source compensation displacement is calculated by the formula:

[0143]

[0144] The light source compensation displacement is used to adjust the illumination center position, so that the light source position is aligned with the target area, thereby improving the image collection uniformity;

[0145] Wherein:

[0146] This is the amount of synchronous displacement compensation for the light source;

[0147] Speed-compensation coefficient;

[0148] This represents the distance the side panel moves.

[0149] Optionally, during image processing in step 7, the following formula is used:

[0150]

[0151] The system performs coordinate correction on the image frames;

[0152] in:

[0153] These are the pixel coordinates of the lower surface after the transformation;

[0154] This is the scaling factor;

[0155] These are the rotation and shear coefficients;

[0156] This is the translation amount;

[0157] And through the formula:

[0158]

[0159] Calculate the mean error after mapping image points;

[0160] in:

[0161] This represents the average distance error.

[0162] This represents the total number of matching homogeneous feature points;

[0163] For the upper surface Coordinates of one feature point;

[0164] To align the lower surface Coordinates of one feature point;

[0165] To determine the matching accuracy before image stitching or fusion.

[0166] Optionally, when the mean image error meets a set threshold, the system performs weighted fusion on adjacent image frames, and the fusion weight is calculated from the scan position using the following formula:

[0167] ;

[0168] ;

[0169] wherein:

[0170] is the weight of the previous frame;

[0171] is the weight of the next frame;

[0172] x is the horizontal coordinate of the pixel in the overlapping area;

[0173] is the starting and ending horizontal coordinate of the overlapping area;

[0174] The final fused image is obtained by the following formula:

[0175]

[0176] wherein:

[0177] is the gray value of the fused pixel;

[0178] are the gray values of the corresponding pixels of the previous frame and the next frame, respectively;

[0179] The fusion strategy can realize seamless transition and brightness balance of the image.

[0180] The characteristics and functions of the present application will be further understood through the following description.

[0181] The technical scheme of the embodiment discloses a copying machine based on an integrated seamless scanning camera,

[0182] The structure comprises a rack and a synchronous driving structure, a camera adjusting mechanism, an integrated scanning camera, a light source adjusting system, a control system and a sensor.

[0183] The rack is provided with two side plate linear motor modules, the linear motor modules are prior art and will not be described here, the side plate linear motor modules are provided with side plates, the side plates are slidably connected to the rack in the front-rear direction through the side plate linear motor modules, the two side plates are fixedly connected together through a synchronous beam, the synchronous beam extends in the left-right direction, the left and right ends of the synchronous beam are fixedly connected to the lower end inner walls of the side plates, respectively, the synchronous beam comprises two cross beams extending in the left-right direction and a plurality of reinforcing beams fixedly connected between the two cross beams, an object platform made of transparent material is arranged between the two side plates and fixedly connected to the rack, the object platform extends in the front-rear direction, the front and rear ends of the object platform are fixedly connected to the rack through a platform fixing frame extending in the up-down direction.

[0184] The inner side of the side plate is provided with a screw rod module extending in the up-down direction, which includes a screw rod, a screw rod motor, a screw rod fixed block and a screw rod slide rail. The output end of the screw rod motor is fixedly connected with the screw rod, the screw rod extends in the up-down direction, the screw rod slide rail is provided with two, which are respectively located on the front and rear sides of the screw rod, and the screw rod slide rail extends in the up-down direction. The screw rod fixed block is threadedly connected on the screw rod, a camera fixed plate is installed on the screw rod module, the outer side of the camera fixed plate is fixedly connected with the screw rod fixed block, and the front and rear ends of the camera fixed plate are respectively slidably connected on the screw rod slide rail. The camera fixed plate is slidably connected on the side plate by the screw rod module in the up-down direction. The screw rod module includes an upper screw rod module and a lower screw rod module. The upper screw rod module is installed on the upper half of the side plate and extends downward, and the lowermost end of the screw rod of the upper screw rod module is located below the upper end surface of the object platform. The lower screw rod module is installed on the lower half of the side plate and extends upward, and the lowermost end of the screw rod of the lower screw rod module is located above the lower end surface of the object platform.

[0185] The camera fixed plate is fixedly connected with an integrated scanning camera. The integrated scanning camera extends in the left-right horizontal direction, and the left and right ends thereof are respectively fixedly connected with a camera fixed plate. The integrated scanning camera is provided with two, which are defined as an upper scanning camera and a lower scanning camera from top to bottom in the vertical direction. The two integrated scanning cameras are oppositely arranged, the lens scanning reference lines of the two are collinear, the lenses face opposite directions and are oppositely arranged. The upper scanning camera is located above the object platform, and the lens faces downward. The lower scanning camera is located below the object platform, and the lens faces upward.

[0186] The camera fixing plate is provided with a light source linear motor module extending in the front-rear direction, two light source linear motor modules are correspondingly arranged on each camera fixing plate, the light source linear motor module at the front extends to the rear, the light source linear motor module at the rear extends to the front, forming a front-rear symmetrical sliding guide structure, the light source linear motor module is provided with an external light source device extending in the left-right direction, the left and right ends of the external light source device are connected with the corresponding light source linear motor module, and the external light source device is connected with the corresponding light source linear motor module through the light source linear motor module and slides in the front-rear direction on the camera fixing plate, the light source linear motor module is located in the inner side area of the inner side surface of the two integrated scanning cameras, and the external light source device is located in the inner side space of the integrated scanning camera, when the external light source device slides in the front-rear direction, the motion track of the external light source device does not intersect with the spatial position of the integrated scanning camera, and the two are not interfered with, the two external light source devices on the upper side are symmetrically and obliquely arranged, the light emitted by the two external light source devices is obliquely extended downward, and the light is finally collectively directed to the object scanning area; the two external light source devices on the lower side are symmetrically and obliquely arranged, the light emitted by the two external light source devices is obliquely extended upward, and the light is finally collectively directed to the object scanning area.

[0187] The rack is provided with a control system, the side plate linear motor module, the screw module, the light source linear motor module, the integrated scanning camera and the external light source device are electrically connected with the control system, the rack is provided with a front sensor for detecting the key attributes of the material, and the front sensor includes an infrared thickness sensor, a light transmittance detector and a reflectivity sensor.

[0188] The external light source device includes a shell, a cover plate is arranged on the upper end face of the shell, the cover plate is made of transparent material, a rotating shaft is rotatably connected in the shell, the rotating shaft is driven to rotate by a driving motor fixed on the shell, a light source fixing shaft is fixed on the rotating shaft, and a light source is fixed on the light source fixing shaft, the rotating shaft can be driven to rotate according to needs, so as to change the inclination angle of the light source setting object.

[0189] The integrated scanning camera includes a camera profile with both ends fixed to side plates. The camera profile contains a component housing cavity and a lens housing cavity. The component housing cavity holds the components required for camera operation. A camera backplate is mounted on the upper surface of the camera profile to cover the components. A seamless lens extending horizontally and vertically is mounted within the lens housing cavity. A chip board fixed to the camera profile is also mounted within the lens housing cavity. A photosensitive element is mounted on the chip board, which is positioned above the seamless lens. Reflected light from text or images is focused by the seamless lens onto the effective photosensitive area of ​​the photosensitive element, thus completing the scanning function. The photosensitive elements are linearly arranged horizontally. Adjacent sensors are precisely calibrated to achieve "gap-free splicing." The seamless lens is composed of multiple lens plates. The edges of the lens plates are designed with an inclined surface, and their inclination angle is strictly parallel to the common tangent of two adjacent cylindrical lenses, ensuring that the lenses remain continuous and evenly spaced after splicing. Vacuum adsorption positioning technology is used when splicing adjacent lens plates, combined with special optical adhesive, to achieve seamless bonding. By using a pre-designed edge tilt angle, the system automatically compensates for the tiny gaps caused by cutting at the splicing point, ultimately forming a continuous and optically uniform seamless lens; a glass plate fixed to the camera profile is placed below the seamless lens to prevent dust from entering.

[0190] A method for using a plate-copying machine based on an integrated seamless scanning camera includes the following steps:

[0191] A: Connect the power supply, start the control system, trigger the equipment self-test program to initialize the side panel linear motor module, upper / lower lead screw module, and light source linear motor module to perform self-test, confirm that each moving part is running smoothly, and that the integrated scanning camera and external light source device are functioning normally. Confirm the initial state of the equipment through the control system display screen, that the side panel is in the reference position, the upper / lower camera is at the initial height, and the external light source device is in the middle standby state.

[0192] The "pulse response detection method" is used to send tiny drive pulses (such as 0.1mm displacement commands) to each motor module, and the position signal feedback is used to determine whether the motor is stuck. For the camera and light source, standard test signals are sent to detect whether the image acquisition is normal and whether the light intensity of the light source meets the standard. When the self-test is abnormal, the specific faulty component is output through the "fault location algorithm".

[0193] Formulas involved:

[0194] Motor displacement deviation calculation:

[0195]

[0196] in Motor displacement deviation (mm) when > 0.02mm is determined as jam; is the instruction displacement (mm) corresponding to the driving pulse, and the default = 0.1mm; is the actual displacement (mm) fed back by the motor encoder;

[0197] B: Place the material to be scanned flat on the center of the transparent object platform. Align the material with the positioning scale line at the edge of the platform to avoid deviation. Click "Material Pre-analysis" on the control system interface to start full-surface pre-scanning at low speed (0.5m / min) and low resolution (300dpi) to collect initial image data of the material. Include the surface to be scanned (upper surface / lower surface / double surface), material thickness, light transmission, surface reflectivity, and texture characteristics. Collect basic data through the front sensor (infrared thickness sensor, light transmission detector, reflectivity sensor) to determine the material properties. The infrared sensor emits infrared light to penetrate the material. Calculate the thickness according to the received light intensity attenuation. The light source module emits standard white light, and the light transmission detector receives the transmitted light intensity to calculate the light transmission rate (0-100%). Divide into three categories: non-transparent (<30%), semi-transparent (30%-70%), and highly transparent (>70%). The directional light source illuminates the material surface at a 45° angle, and the reflectivity sensor receives the reflected light intensity to calculate the reflectivity. Through image pre-collection (low-resolution rapid shooting), identify whether the material surface has texture / pattern to determine the need for single or double surface scanning. Use the "gray scale variance distribution algorithm" to determine whether the surface is uniform. If the gray scale variance fluctuation of the entire area is >20%, mark it as "non-uniform surface material" and trigger dynamic adjustment later.

[0198] The formula involved is:

[0199] Light source luminous intensity compliance judgment: After sending a standard test signal, detect the deviation of the actual luminous intensity of the light source from the rated value:

[0200] Light source intensity deviation rate:

[0201]

[0202] Where, is the light source intensity deviation rate (%), <10 is determined as compliant; is the actual luminous intensity of the light source; is the rated luminous intensity of the light source.

[0203] Based on the light intensity attenuation law of infrared light penetrating the material, calculate the material thickness:

[0204] Infrared light intensity attenuation model:

[0205]

[0206] Where d is the material thickness (mm), k is the material infrared absorption coefficient , through pre-calibration (such as cloth k = 0.2 , plastic k = 0.15 ; is the infrared sensor emission light intensity (μW / cm²); is the infrared sensor received through light intensity (μW / cm²);

[0207] Material light transmittance calculation, through the light intensity ratio of standard white light penetrating the material, the light transmittance type is divided,

[0208] Light transmittance definition formula:

[0209]

[0210] Where T is the material light transmittance (%), according to T <30% (non-transparent), 30% <T <70% (semi-transparent), T >70% (high transparent) classification; is the light transmittance detector received through white light intensity (μW / cm²), is the standard white light intensity emitted by the light source module (μW / cm²);

[0211] Material reflectivity calculation, through the reflected light intensity after irradiation by directional light source (45° angle), calculate the reflectivity,

[0212] Reflectivity definition formula

[0213]

[0214] Where R is the material surface reflectivity (%); is the directional light source incident light intensity (μW / cm²); is the reflectivity sensor received reflected light intensity (μW / cm²); is the angle between the incident light and the material surface, here =45°;

[0215] Surface uniformity judgment, through the gray variance fluctuation of pre-scanning image, mark "surface uneven material",

[0216] Full area gray variance:

[0217]

[0218] Gray variance fluctuation coefficient:

[0219]

[0220] Where CV is the gray variance fluctuation coefficient (%), and CV>20% is marked as "uneven surface material";

[0221] is the gray value (0-255) of the (i,j) pixel in the pre-scanned image; is the average gray value of the whole image; is the pixel resolution of the pre-scanned image (e.g., M=1000, N=1000 at 300 dpi); is the gray variance of the image sub-region; is the average gray variance of all sub-regions of the whole image.

[0222] C: The control system automatically recommends a scanning mode (Mode 1-5) based on the material property analysis results of Step B, and displays the recommended reasons on the interface:

[0223] Mode 1 (Upper camera + upper light source cooperative scanning): Suitable for non-transparent materials that only need to detect the upper surface (transmittance <30%, and single upper surface with patterns);

[0224] Mode 2 (Lower camera + lower light source cooperative scanning): Suitable for non-transparent materials that only need to detect the lower surface (transmittance <30% and single lower surface with patterns);

[0225] Mode 3 (Upper camera + lower light source cooperative scanning): Suitable for semi-transparent materials that need to detect the upper surface (30%≤transmittance≤70%, and upper surface scanning);

[0226] Mode 4 (Lower camera + upper light source cooperative scanning): Suitable for non-transparent thick materials that need to detect the lower surface (transmittance <30%, thick material thickness >20mm, and lower surface scanning);

[0227] Mode 5 (Double-sided synchronous scanning): Suitable for materials that need to detect both upper and lower surfaces (both surfaces have patterns, and any transmittance);

[0228] D: The system calls the pre-scanned image of Step B to automatically identify the areas that need to be enhanced scanning (such as texture-intensive areas, edge contour areas);

[0229] Preprocessing: 3x3 Gaussian filter is used to eliminate noise, and Canny operator is used to extract image edges; Feature judgment: Texture density is calculated by "gray co-occurrence matrix" (marked as intensive area if >30%), and highlight area is identified by "brightness deviation algorithm" (gray deviation >20%); Area processing: "Connected region merging algorithm" is executed on candidate areas with a distance <10mm to avoid fragmentation; Image coordinates are converted to side plate displacement coordinates through "pixel-displacement mapping" (e.g., 1mm corresponds to 20 pixels), and the output area range is output;

[0230] After recognition is completed, the fine area range (e.g., X: 120-190mm, Y: 50-480mm) is marked with a red box on the display screen. Users can manually fine-tune the area size; the system automatically matches enhancement parameters for the fine area.

[0231] The algorithm involved calculates texture density (gray-level co-occurrence matrix), and determines the texture density based on the energy value of the gray-level co-occurrence matrix.

[0232] Gray-level co-occurrence matrix energy value (texture density index):

[0233]

[0234] Where E is the texture density index, and when E>0.03 (corresponding to texture density>30%), it is marked as a "texture-dense area";

[0235] (P(i,j) is the probability of gray-level pair (i,j) in the gray-level co-occurrence matrix after normalization) ), usually taking a co-occurrence matrix with a distance of 1 and an angle of 0°.

[0236] Brightness deviation area identification identifies reflective / underexposed areas by measuring the deviation between pixel grayscale values ​​and the average grayscale of the area.

[0237] Brightness deviation rate:

[0238]

[0239] in, The brightness deviation rate (%) Areas exceeding 20% ​​are marked as "brightness deviation areas" (reflective / underexposed areas); This represents the average gray value of the sub-region.

[0240] Pixel-to-displacement mapping (image coordinates to side plate displacement) converts the image pixel coordinates of fine regions into side plate displacement coordinates:

[0241] Pixel-displacement mapping relationship:

[0242]

[0243] Where s is the side plate displacement coordinate (mm); p is the image pixel coordinate (pixels). This refers to the resolution factor (pixels / mm), such as at 300 dpi. = (Pixels / mm is calculated by default as 1mm corresponds to 20 pixels for simplification).

[0244] E: After the user confirms the mode in step C, the system automatically configures the initial parameters, including the camera height:

[0245] Mode 1 / 3, the upper camera is driven by the upper lead screw module to move in the vertical direction, so that the distance between the lens and the upper surface of the material reaches the preset value;

[0246] Mode 2 / 4, the lower camera is driven by the lower lead screw module to move in the vertical direction, so that the distance between the lens and the lower surface of the material reaches the preset value;

[0247] Mode 5, the upper and lower lead screw modules are adjusted synchronously to ensure that the scanning reference lines of the upper and lower cameras are collinear, and the upper and lower cameras respectively maintain an adaptive distance from the upper and lower surfaces of the material;

[0248] F: configure the initial angle parameters of the light source, mode 1 / 4 only enables the two outer light source devices on the upper side, mode 2 / 3 only enables the two outer light source devices on the lower side, and mode 5 synchronously enables the light sources on the upper and lower sides,

[0249] The outer light source devices are driven by the light source linear motor module to move in the front-back direction, and are adjusted to a preset position. According to different materials, the light sources on the two sides are moved to different positions. At the same time, the inclination angle of the light source fixing shaft of the outer light source device can be adjusted according to the requirements, so that the angle of the light source changes;

[0250] If the surface of the material is uniform, or when the conventional mode is manually selected, the fixed light source mode is enabled, the contrast of the scanned image is calculated using the "gray scale variance method", the gray scale value of the pre-scanned image is counted, and the variance σ is calculated. If σ < 50, it is low contrast, if 50 ≤ σ ≤ 150, it is qualified, and if σ > 150, it is high contrast. Based on the "gradient descent method", the light source parameters are optimized,

[0251] In the initial state, the light source is located in the middle position (front-back direction) and the angle is 45°. The pre-scanned image is collected, and the contrast σ1 is calculated.

[0252] If σ1 < 50 (low contrast), adjust the front-back position of the light source, move 5mm towards the scanning area, collect the image and calculate σ2. If σ2 > σ1, continue to move until σ reaches the qualified range. Adjust the inclination angle. If σ is still < 50 after position adjustment, reduce the angle by 5° (30°→25°→…), increase the direct light intensity, and until σ ≥ 50.

[0253] If σ1 > 150 (high contrast / overexposure), adjust the front-back position of the light source, move 5mm away from the scanning area, collect the image and calculate σ2. If σ2 < σ1, continue to move until σ reaches the qualified range. Adjust the inclination angle. If σ is still > 150 after position adjustment, increase the angle by 5° (45°→50°→…), reduce the direct light intensity, and until σ ≤ 150.

[0254] When the contrast σ is stable in the range of 50-150, and the change amount of σ is < 5% after continuous adjustment for 3 times, the adjustment is terminated.

[0255] If the material is "surface uneven type", or the "dynamic light source mode" is enabled, the system starts the dynamic light source adjustment mode,

[0256] Load the "displacement-illumination offset mapping table" (prestore compensation parameters at different scanning speeds) in the control system, and enable the "real-time image analysis module". Set the contrast detection frequency of each frame of image (consistent with the camera frame rate). After each frame of image is collected, the "real-time image analysis module" calculates the contrast σ,

[0257] If σ> 150 (overexposure): the control system immediately sends a command to drive the light source to move 3-5 mm away from the material, while increasing the tilt angle by 5°-10° and weakening the direct light;

[0258] If σ< 50 (underexposure): drive the light source to move 2-3 mm towards the material, reduce the tilt angle by 3°-5°, and enhance the illumination;

[0259] Adjust and delay 1 frame (≈33ms) for detection again until σ is stable in the range of 50-150,

[0260] Displacement offset compensation: according to the displacement signal of the side plate linear motor module (1 pulse is sent for every 0.1 mm movement), the light source position is compensated synchronously. When the scanning speed is 3 m / min, the camera moves forward by 10 mm, and the light source moves forward by 0.2 mm synchronously. When the speed increases by 1 m / min, the light source angle increases by 2°, which offsets the air flow disturbance;

[0261] Smooth transition in start-stop phase: in the acceleration phase (0-1 m / min), the light source angle gradually increases by 5° from the initial value, while moving backward at a speed of 0.1 mm / s; in the deceleration phase (8-0 m / min), the light source angle gradually decreases by 5° to the initial value, while moving forward at a speed of 0.1 mm / s.

[0262] The formula involved: image contrast calculation, determine whether the contrast is qualified by the gray variance of the pre-scanned image;

[0263] Image contrast:

[0264]

[0265] Wherein, is the image contrast (gray standard deviation), <50 (low contrast), 50 <150 (qualified), > 150 (overexposure); P is the total number of pixels in a single frame of image; is the gray value of the kth pixel; is the average gray value of a single frame of image;

[0266] Dynamic light source displacement compensation, according to the scanning speed and camera displacement, synchronously compensate the light source position, offset the field of view deviation:

[0267] Light source synchronous displacement compensation amount:

[0268]

[0269] The light source synchronous displacement compensation amount (mm); The speed-compensation coefficient is =0.02+0.02×(v-3) (v is the scanning speed, unit: m / min), when (v=3 m / min, =0.02 (that is, the camera moves 10 mm, and the light source moves 0.2 mm); The camera (side plate) moving distance (mm).

[0270] Light source angular speed compensation amount:

[0271]

[0272] Wherein, The light source angular compensation amount (°), the scanning speed is increased by 1 m / min, and the angle is increased by 2°; v is the scanning speed (m / min), v>1\m / min.

[0273] Start-stop stage light source smooth transition, acceleration / deceleration stage, light source angle and position linear transition,

[0274] Acceleration stage light source position transition

[0275]

[0276] Acceleration stage light source position transition

[0277]

[0278] Wherein, The light source angle (°) at t time, The initial angle (default 45°); The scanning speed (m / min) at t time, acceleration stage From 0 to 1 m / min; The light source position (mm) at t time, The light source middle position; t is the acceleration time (s);

[0279] The deceleration stage formula is symmetrical, the angle is reduced from To , the position is reset from To .

[0280] G: Start the automatic scanning program, the side plate linear motor module drives the side plate to move uniformly in the front-back direction, driving the integrated scanning camera and external light source device to move synchronously, completing image acquisition;

[0281] Based on the "pulse synchronization signal", the cooperation of the bilateral camera and the side plate drive is realized. The side plate linear motor module moves 0.1mm every time, and sends a synchronization pulse to the control system. After receiving the pulse, the control system triggers the upper and lower cameras to collect one frame of image at the same time (frame rate matching the moving speed: 30fps when the speed is 1m / min), ensuring that the upper and lower cameras collect images at the same spatial position;

[0282] Using "SIFT (Scale Invariant Feature Transform) algorithm" to extract feature points (such as edges, texture inflection points) of the upper and lower surface images, performing grayscale and Gaussian blur processing on the upper and lower images to eliminate noise, constructing a scale space, detecting extreme points (feature points), calculating the position, scale and direction of the feature points, generating feature point descriptors (128-dimensional vectors), and matching homologous feature points (such as the same inflection point of the material edge) of the upper and lower images through the "nearest neighbor matching method";

[0283] Based on the matched feature points, the spatial transformation matrix (affine transformation) of the upper and lower images is calculated, at least 4 pairs of matched feature points are selected to construct an equation system, and the transformation parameters (translation Δx, Δy, rotation angle θ) are solved. According to the transformation parameters, the lower surface image is translated and rotated to make the feature points of the upper and lower surfaces completely coincide. The alignment accuracy is verified, the "feature point distance error" of the aligned upper and lower images is calculated, and the average error is less than 0.1mm for qualified, otherwise the feature points are re-extracted and matched;

[0284] The formula involves SIFT feature point matching, and the Euclidean distance of the feature point descriptor is used to match the homologous feature points of the upper and lower surface images:

[0285] Euclidean distance of feature point descriptor

[0286]

[0287] Where D is the Euclidean distance of two feature point descriptors, D<0.6× is determined as a homologous point (n is the second nearest neighbor descriptor distance); , , m-dimensional descriptor of two feature points (128-dimensional vector)

[0288] Affine transformation of upper and lower images (spatial alignment), based on 4 pairs of homologous feature points, affine transformation matrix is calculated to realize the alignment of upper and lower images:

[0289] Affine transformation matrix

[0290] For the lower surface image pixel (x, y), the transformed coordinate (x', y') satisfies:

[0291]

[0292] Where the transformation parameters are solved by the homologous point coordinates: Given the upper and lower surface 4 pairs of homologous points …, the equation group is constructed:

[0293]

[0294] Where (x', y') is the transformed lower surface pixel coordinate, (x, y) is the pre-transformed lower surface pixel coordinate, a, d are scaling factors, b, c are rotation and shear factors, , is the translation (mm, corresponding to the pixel coordinate needs to be converted by "pixel-displacement mapping").

[0295] Verify its accuracy (feature point distance error), calculate the distance error of the homologous feature points of the aligned upper and lower images, and verify the alignment accuracy:

[0296] The average distance error of the feature points is:

[0297]

[0298] Where, is the average distance error (mm), <0.1 is determined to be qualified, Q is the total number of matched homologous feature points ((Q≥4); is the coordinate of the qth feature point of the upper surface (mm), is the coordinate of the qth feature point of the lower surface after alignment (mm);

[0299] H: When the "dynamic light source mode" is enabled, and the side plate displacement enters the "fine area", the system automatically triggers the "local enhancement mode". The light source moves 5mm towards the material, the angle decreases by 10°, and the camera exposure time increases by 20%. After leaving the fine area, the light source and exposure parameters automatically reset to the normal state. When scanning on both sides, the upper and lower light sources independently perform dynamic adjustment (the upper light source adjusts according to the upper surface image, and the lower light source adjusts according to the lower surface image). The adjustment parameters do not interfere with each other, ensuring that the imaging quality of the upper and lower surfaces is optimized simultaneously.

[0300] I: After scanning is completed, the system automatically performs image stitching, noise reduction, enhancement and other processing. Single-sided scanning generates a single surface image file, and double-sided scanning generates a three-dimensional image file with the upper and lower surfaces aligned. Users can perform secondary editing (cropping, labeling, etc.) on the processed images through the control system, and save them to local storage or upload them to the cloud system after confirming that there are no errors.

[0301] The system adopts "adaptive bilateral filtering algorithm", taking into account noise reduction and detail preservation, and divides the image into blocks, calculates the gray variance of each block, reduces the filter kernel radius for blocks with large variance (rich texture area) to retain details, and increases the filter kernel radius for blocks with small variance (smooth area) to enhance the noise reduction effect. After filtering, the image contrast is enhanced through "histogram equalization" to highlight the texture details.

[0302] For wide-width materials, "feature point matching + fade-in and fade-out fusion" is used to realize splicing. The overlapping area of adjacent frames is extracted (overlapping rate 20%, to ensure feature point matching), SIFT algorithm is used to match the feature points of adjacent frames, the splicing transformation matrix is calculated, the next frame image is transformed to align with the overlapping area of the previous frame, and fusion processing is performed. In the overlapping area, the weight of the previous frame image decreases linearly from 1 to 0, and the weight of the next frame image increases linearly from 0 to 1, eliminating the splicing marks (brightness difference <5%);

[0303] Involving formula, adaptive bilateral filtering (noise reduction), according to the gray variance of the image sub-region, dynamically adjusting the filter kernel radius,

[0304] Filter kernel radius adaptive adjustment:

[0305]

[0306] Bilateral filter output gray value:

[0307]

[0308] Where, r is the filter kernel radius (pixels), is the gray variance of the sub-region; is the gray value of the (i,j) pixel after filtering; W is the normalized weight factor; is the spatial domain standard deviation (default 3); is the gray domain standard deviation (default 20);

[0309] Wide image splicing (fade-in and fade-out fusion), in the overlapping area of adjacent frames, the splicing marks are eliminated by linear weight fusion:

[0310] Overlapping area fusion weight, for the pixels in the overlapping area, the weight of the previous frame and the weight of the next frame satisfy:

[0311] ;

[0312] ;

[0313] Fusion pixel gray value:

[0314]

[0315] wherein x is the horizontal coordinate of the pixel in the overlapping region; 、 are the start and end horizontal coordinates of the overlapping region; are the gray values of the corresponding pixels of the previous frame and the next frame respectively; is the gray value of the fused pixel, ensuring the brightness difference of the overlapping region ;

[0316] H: turn off the power of the device, perform pre-shutdown self-check, and reset each moving part to the initial position.

[0317] In summary, the two side plates on the rack of the copying machine are fixed by the synchronous beam, and the linear motor module of the side plate can drive the two side plates to move uniformly in the front-back direction at the same speed. The core function is to drive the camera fixing plate, the integrated scanning camera and the external light source device on the two side plates to move synchronously, ensuring that the relative position of the camera and the light source does not change during scanning, and avoiding the misalignment of the scanning image caused by unilateral displacement deviation.

[0318] The lower end of the upper lead screw module of the copying machine of the application extends below the upper end surface of the object platform, and the upper end of the lower lead screw module extends above the lower end surface of the object platform, so that the upper and lower scanning cameras can break through the "platform boundary restriction" to realize close-range scanning, adapt to thin film materials with a thickness of 0.1mm and plate materials with a thickness of 50mm, solve the problem of "thin material scanning blur and thick material cannot be covered" caused by insufficient stroke of traditional equipment, and increase the scanning thickness adaptation range by more than 2 times.

[0319] The copying machine of the application can accurately identify the texture dense area and the edge contour area through the fine area automatic detection algorithm (Canny edge extraction + gray level co-occurrence matrix texture analysis), trigger the "light source moves forward and backward by 5mm + angle decreases by 10° + exposure time increases by 20%" reinforcement scheme, and improve the local detail recognition rate (such as 0.1mm cloth texture and 0.2mm circuit board line) from 70% to 99%, without relying on high-resolution cameras to realize fine copying.

[0320] The fine area automatic detection algorithm (Canny edge extraction + gray level co-occurrence matrix texture analysis) of the copying machine of the application can accurately identify the texture dense area and the edge contour area, trigger the "light source moves forward and backward by 5mm + angle decreases by 10° + exposure time increases by 20%" reinforcement scheme, and improve the local detail recognition rate (such as 0.1mm cloth texture and 0.2mm circuit board line) from 70% to 99%, without relying on high-resolution cameras to realize fine copying.

[0321] The copy machine of the present application can drive the external light source device to move in the front-back direction according to the material, thickness, and surface characteristic difference of the scanned material of the copy machine, that is, the angle can be adjusted (inclination angle 0-90°) through the shaft and the driving motor to change the relative distance and the illumination angle between the light source and the scanned material, and then dynamically adjust the illumination intensity and the light projection range. The upper two external light source devices can move independently or synchronously in the front-back direction, and the lower two external light source devices can also move independently or synchronously in the front-back direction. Through the coordinated displacement adjustment of unilateral single light source, unilateral double light source, or upper and lower light sources, a variety of differentiated lighting environments can be formed, including but not limited to concentrated illumination, diffuse illumination, unilateral inclined enhanced illumination, bilateral symmetrical balanced illumination, etc. The copy machine can adapt to the scanning needs of different types of materials. Compared with the traditional fixed light source equipment, the light source adjustment dimension is upgraded from "single front-back movement" to "front-back + angle" two-dimensional adjustment, which can accurately match the illumination angle for different albedo materials (such as metal high-reflective surface, leather matte surface), and eliminate glare or shadow interference.

[0322] The copy machine of the present application can adapt to non-transparent materials (mode 1 / 2), semi-transparent materials (mode 3), thick materials (mode 4), and double-sided materials (mode 5) through the modular combination of "camera + light source" (5 scanning modes). For example, for semi-transparent frosted plastic plates, the "upper camera + lower light source" mode is adopted, the lower light source penetrates the material and is scattered through the upper surface, and the frosted texture is captured by the upper camera, solving the problem of "loss of surface details of semi-transparent materials" of traditional equipment. For double-sided circuit boards, the "double-sided synchronous scanning" mode is adopted, the upper and lower cameras are synchronously collected, and the collinear design of the reference line is used to ensure the positioning accuracy, avoiding the positioning error (the positioning accuracy is improved from ±0.5 mm to ±0.1 mm) caused by the traditional "two-time flipping scanning".

[0323] The integrated scanning camera of the copy machine of the present application extends in the left-right horizontal direction and is fixed at both ends, which avoids the "scanning fault" caused by the joint gap compared with the traditional spliced camera. At the same time, the scanning reference lines of the upper and lower cameras are collinear, and the spatial correspondence of the upper and lower surface images is improved during bilateral scanning, and the subsequent data comparison efficiency is improved by 40%, which is especially suitable for the composite material "upper and lower surface correlation detection" scene.

[0324] During bilateral scanning of the copy machine of the present application, the side plate drives the upper and lower cameras and the light source to move synchronously, without the need for scanning the upper and lower surfaces twice, and the scanning efficiency is improved by 1 times. At the same time, the system automatically completes image splicing, noise reduction, and alignment, avoiding the time-consuming and error of traditional manual processing.

[0325] The above merely preferred embodiments of the present application and are not intended to limit the embodiments and protection scope of the present application. Those skilled in the art should be able to understand that any equivalent substitutions and obvious changes made according to the present application description and drawings should be included in the protection scope of the present application.

Claims

1. A method of using a photocopier based on an all-in-one seamless scanning camera, characterized in that, The method comprises the following steps: Step 1: start the copying machine, trigger the system self-checking program and move the scanning assembly to the initial position; Step 2: perform material pre-analysis on the to-be-scanned object placed on the object platform, preliminarily collect images and generate a pre-analysis result; Step 3: select a matched scanning mode according to the pre-analysis result, and identify fine areas in the images; Step 4: configure height parameters and light source parameters of the upper scanning camera and the lower scanning camera according to the scanning mode; Step 5: control the side shift device to drive the upper scanning camera and the lower scanning camera to move along the object platform, and perform image collection; Step 6: when scanning to the fine area, automatically switch to a local enhanced scanning mode; Step 7: after completing the scanning, perform image data processing, including error analysis, position correction, image fusion, and generate an image file; Step 8: save the image file and perform system reset before shutdown; Wherein When performing image processing in step 7, the formula is used: ； The system performs coordinate correction on the image frames; Wherein: is the transformed lower surface pixel coordinate; are scaling coefficients; where is the rotational and shear coefficient; is the translation amount; And the formula is used: ； Calculate the error mean value of the image point mapping; Wherein: is the average distance error; total number of matched homogenous feature points; For the upper surface, the first characteristic point coordinate; to align the back lower surface with the first feature point coordinate; To judge the matching accuracy before image splicing or fusion; and When the image error mean value meets the set threshold condition, the system performs a weighted fusion strategy on the adjacent image frames, and the fusion weight is calculated by the following formula: ； Wherein: is the weight of the previous frame; is the weight for the latter frame; x is the horizontal coordinate of the pixel in the overlapping area; start and end horizontal coordinates for the overlap region; The final fused image is obtained by the following formula: ； Wherein: is the gray value of the fused pixel; respectively the gray value of the corresponding pixel of the previous frame, the next frame; The weighted fusion strategy can realize seamless transition and brightness balance of the images.

2. The method of using a one-piece seamless scanning camera based photocopier of claim 1, wherein, When configuring the light source parameters in step 4, the formula is used: ； Calculate the light source compensation displacement, which is used to adjust the irradiation center position, align the light source position with the target area, and thus improve the uniformity of image collection; Wherein: to compensate for a synchronous displacement of the light source; V is the velocity-compensation factor; The side plate moves a distance.

3. A method of using a one-piece seamless scanning camera-based photocopier according to any one of claims 1-2, characterized in that, It includes: A rack; An object platform fixed on the rack; A side shift device movably connected at the length direction position of the rack; A lead screw device installed in the side shift device along the up-down movement direction; A scanning assembly connected to the side shift device through the lead screw device and located above and below the object platform, and can approach or move away from the object platform through the lead screw device, and the scanning assembly includes an external light source device; And A background controller in communication connection with the side shift device, the lead screw device and the scanning assembly; wherein The background controller controls the side shift device to move along the length direction of the object platform, and controls the scanning assembly to move in the up-down direction to approach or move away from the object platform, and provides light source to the scanning direction, so as to scan the face or face and back of the to-be-scanned object placed on the object platform and obtain scanning images; and the background controller also controls the light illumination angle of the external light source device to the object platform.

4. The one-seam scanner-based photocopier of claim 3, wherein, The side shift device comprises: A pair of side plates slidably connected to the tracks on both sides of the rack in the width direction; A synchronous beam connected to the inner bottom of a pair of side plates at both ends; and A pair of side shift lead screw groups respectively arranged at the connection between the side plates and the rack; wherein The side shift lead screw groups control a pair of side plates to move synchronously through the synchronous beam.

5. The one-seam scanner-based photocopier of claim 4, wherein, The number of the screw rod devices is two groups, which are arranged on the inner side surfaces of the side plates respectively, and each group of the screw rod devices comprises upper and lower vertically coaxial and oppositely symmetrical upper and lower screw rod devices with the same structure, each of the upper and lower screw rod devices comprises a screw rod, a screw rod motor, a screw rod fixed block and a screw rod sliding rail arranged in a conventional manner, the screw rod motor controls the rotation of the screw rod and drives the screw rod fixed block to move back and forth along the length direction of the screw rod guided by the screw rod sliding rail, and each of the screw rod fixed blocks is connected with a camera fixed plate for connecting the scanning assembly.

6. The one-seam scanner-based photocopier of claim 5, wherein, The scanning assembly comprises: a one-piece scanning camera, two ends of which are connected to corresponding camera fixed plates in a pair of the side plates respectively, for scanning a to-be-scanned object on the object platform and acquiring a scanning image; the external light source device, two ends of which are connected to corresponding camera fixed plates in a pair of the side plates through light source moving screw rod groups respectively, for providing a light source to the to-be-scanned object on the object platform, and the light source irradiation direction points to the scanning area of the one-piece scanning camera.

7. The one-seam scanner-based photocopier of claim 6, wherein, The one-piece scanning camera comprises upper and lower scanning cameras with the same structure and opposite mounting modes, and two ends of each of the upper and lower scanning cameras are connected between a pair of the upper screw rod devices and a pair of the lower screw rod devices respectively, the upper and lower scanning cameras each comprise: a camera profile in the shape of a long rectangular cabinet with an element accommodating cavity and a lens accommodating cavity in the interior, and an opening is formed at the top and the bottom of the lens accommodating cavity; a camera back plate covering and sealing the opening at the top of the camera profile; a chip horizontally arranged in the lens accommodating cavity and close to the camera back plate; a glass plate covering and sealing the opening at the bottom of the lens accommodating cavity; a seamless lens vertically arranged in the lens accommodating cavity along the length direction of the camera profile and contacting the glass plate, and located below the chip; and a pair of camera light source plates arranged in the lens accommodating cavity along the length direction of the camera profile and symmetrically distributed on both sides of the seamless lens with the light sources inclined downward towards the glass plate; wherein the glass plate faces the object platform.

8. The one-seam scanner-based photocopier of claim 7, wherein, The number of the external light source devices is two groups, which are arranged in a triangular shape between a pair of the camera fixed plates together with the one-piece scanning camera, and the two external light source devices are located on one side of the glass plate of the one-piece scanning camera, the light source irradiation directions of the two external light source devices jointly point to the scanning area of the one-piece scanning camera, and each of the external light source devices comprises: a housing in the shape of a long rectangular cabinet with an open bottom; a cover plate covering and sealing the opening at the bottom of the housing; a light source fixing shaft located in the housing; a rotating shaft formed at both ends of the light source fixing shaft and rotatably arranged at the inner sides of both ends of the housing in the length direction; and a light source plate fixed on the light source fixing shaft and generally facing the cover plate; wherein The shell is provided with a rotating shaft seat at the position connected with the rotating shaft, the rotating shaft seat is provided with a driving motor connected with the rotating shaft, the driving motor controls the rotating shaft to rotate and drives the light source fixed shaft to rotate, and the rotating direction of the light source plate is controlled to adjust the light irradiation angle of the external light source device to the object platform.

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