A mobile phone cover plate light imaging structure and method

Abstract

The application provides a mobile phone cover plate light imaging structure and method, belonging to the technical field of mobile phone cover plate appearance detection, which comprises the following steps: a workpiece is fixed on a moving platform, the workpiece is moved by the moving platform, when the moving platform drives the workpiece to pass through the shooting position of a camera lens assembly, the camera lens assembly cooperates with a first light source and a second light source to collect two images of the workpiece respectively; the same camera lens assembly is used to collect two images of the workpiece, the workpiece does not need to be repositioned, the dirty area in the two images does not change, the accuracy of the dirty position in the two image collection is improved, and then by comparing the two images of the workpiece, the interference of dirt on the automatic detection equipment during detection is effectively reduced, the misjudgment of the detection equipment is reduced, and the accuracy of workpiece detection is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mobile phone cover plate appearance detection, and particularly relates to a mobile phone cover plate light imaging structure and method. BACKGROUND

[0002] The camera and the light source are installed at a specified angle and distance, the product to be detected is placed on the transmission device and moves at a specified speed along with the transmission device, when the product to be detected moves to the photographing area of the camera, the camera collects an image, and the automatic detection equipment detects the product according to the image collected by the camera; however, when there is dirt on the product to be detected, the automatic detection is prone to misjudgment, which will affect the final detection result. SUMMARY

[0003] The application aims to at least solve one of the problems in the prior art or related art.

[0004] To this end, a first aspect of the application provides a mobile phone cover plate light imaging structure.

[0005] A second aspect of the application provides a mobile phone cover plate light imaging method.

[0006] Therefore, according to a first aspect of an embodiment of the application, a mobile phone cover plate light imaging structure is provided, which comprises:

[0007] A moving platform, on which a workpiece is placed;

[0008] A camera lens assembly, which is arranged above the moving platform, and the moving platform drives the workpiece to move so that the workpiece passes through a photographing position of the camera lens assembly;

[0009] A first light source, which is arranged between the camera lens assembly and the moving platform, and the first light emitted by the first light source extends in a direction perpendicular to a first path of the workpiece;

[0010] A second light source, which is arranged between the first light source and the moving platform, and when the workpiece passes through the second light source, the second light emitted by the second light source passes through the workpiece in a direction perpendicular to the first path of the workpiece;

[0011] The first path is a moving path of the workpiece when the workpiece passes through the camera lens assembly.

[0012] In a feasible implementation, the camera lens assembly comprises a line-scan camera and a line-scan lens, and the first light source extends in a scanning direction of the line-scan camera.

[0013] In a feasible implementation, the central lighted area of the first light source is a scanning area of the line-scan camera.

[0014] In one feasible implementation, the first light source and the second light source are illuminated alternately in a flickering manner.

[0015] In one feasible implementation, the camera lens assembly takes one line of images each time it receives a high-level signal, and the first light source and the second light source alternately light up once each time they receive a high-level signal.

[0016] In one feasible implementation, the second light source and the first light source are disposed on the first plane, with the second light source located to the side of the shooting position.

[0017] In one possible implementation, the first plane is a vertical plane.

[0018] In one possible implementation, the camera lens assembly is angled relative to the first plane.

[0019] In one feasible implementation, the second light source includes two point light sources, which are concentrically aligned and symmetrically arranged on both sides of the shooting position.

[0020] In one feasible implementation, the first light source is disposed perpendicular to the moving platform and extends along a first path perpendicular to the workpiece.

[0021] In one feasible implementation, the first light source is a high-brightness line light source.

[0022] According to a second aspect of the embodiments of this application, a method for lighting and imaging a mobile phone cover glass is proposed, which uses a mobile phone cover glass lighting and imaging structure as described in any of the above technical solutions to perform lighting and imaging on a workpiece, including:

[0023] Mount the workpiece on the mobile platform;

[0024] Light up the first and second light sources;

[0025] Acquire the first and second images of the workpiece;

[0026] The region information of the first image is removed based on the second image.

[0027] In one feasible implementation, the first light source and the second light source are illuminated alternately in a flickering manner.

[0028] In one feasible implementation, when the workpiece passes the camera lens assembly's imaging position, the first light source and the second light source are alternately illuminated by flashing light, and the camera lens assembly captures the first image and the second image of the workpiece.

[0029] In one feasible implementation, when the first light source and the second light source are alternately lit by flickering, the camera lens assembly takes a picture of one line for each high-level signal received. The first light source lights up once for each high-level signal received, and the second light source lights up once for each high-level signal received.

[0030] In an embodiment, the time interval when the first light source and the second light source are turned on alternately is consistent.

[0031] In an embodiment, the camera lens assembly captures a first image of the workpiece when the first light source is turned on, and captures a second image of the workpiece when the second light source is turned on.

[0032] In an embodiment, the first image images defects and lint dust stains of the workpiece, and the second image images the lint dust stains of the workpiece.

[0033] In an embodiment, the second image is processed to extract information of the lint dust stain area in the second image, and the information of the area in the first image corresponding to the information of the lint dust stain area in the second image is removed.

[0034] In an embodiment, after the area information of the first image is removed according to the second image, a third image is obtained, and the workpiece is detected for defects according to the third image.

[0035] In an embodiment, the method for lighting and imaging a mobile phone cover further comprises: making the first light emitted by the first light source parallel to the scanning direction of the camera lens assembly, and making the central lighting area of the first light source coincide with the scanning area of the scanning of the camera lens assembly.

[0036] In an embodiment, the method for lighting and imaging a mobile phone cover further comprises: making the second light emitted by the second light source parallel to the scanning direction of the camera lens assembly, and making the lighting area of the second light located above the workpiece.

[0037] Compared with the prior art, the mobile phone cover lighting and imaging structure and method of the present application has the following beneficial effects:

[0038] The workpiece is fixed on the moving platform, and the workpiece is moved by the moving platform. When the moving platform drives the workpiece to pass through the photographing position of the camera lens assembly, the camera lens assembly captures two images of the workpiece respectively by cooperating with the first light source and the second light source. The same camera lens assembly is used to capture two images of the workpiece, without the need to reposition the workpiece, so that the dirty area in the two images does not change, the accuracy of the dirty position in the two image capturing is improved, and then by comparing the two images of the workpiece, the interference of the dirt on the automatic detection equipment during detection is effectively reduced, the misjudgment of the detection equipment is reduced, and the accuracy of the workpiece detection is improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] Various other advantages and benefits will become clear to those of ordinary skill in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are only for purposes of illustrating the preferred embodiments and are not to be considered as limiting the application. Moreover, like reference numerals designate corresponding parts throughout the several views of the drawings. In the drawings:

[0040] Figure 1 A schematic structural diagram of a first angle of a mobile phone cover plate light imaging structure according to an embodiment of the present application;

[0041] Figure 2 A schematic structural diagram of a second angle of a mobile phone cover plate light imaging structure according to an embodiment of the present application;

[0042] Figure 3 A schematic structural diagram of a pulse signal frequency of a mobile phone cover plate light imaging structure according to an embodiment of the present application;

[0043] Figure 4 A schematic step flow chart of a mobile phone cover plate light imaging method according to an embodiment of the present application;

[0044] Figure 5 A detection effect before removing information of a workpiece fluff dust point area;

[0045] Figure 6 An image after removing according to a second image of a first image of a mobile phone cover plate light imaging method according to an embodiment of the present application;

[0046] Figure 7 A detection effect after removing information of a workpiece fluff dust point area;

[0047] Wherein, Figure 1 And Figure 2 The correspondence between the reference numerals in the drawings and the component names is as follows:

[0048] 11, mobile platform; 12, workpiece; 13, camera lens assembly; 14, first light source; 15, second light source. DETAILED DESCRIPTION

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "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 do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0050] In addition, the terms "first", "second" 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" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly specified and limited.

[0051] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside 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.

[0052] The preferred embodiments of the present application are described below in conjunction with the drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.

[0053] As shown in Figure 1 and Figure 2 According to the first aspect of the embodiments of the present application, a mobile phone cover light imaging structure is provided, which comprises: a mobile platform 11, a camera lens assembly 13, a first light source 14 and a second light source 15; a workpiece 12 is placed on the mobile platform 11; the camera lens assembly 13 is arranged above the mobile platform 11, the mobile platform 11 drives the workpiece 12 to move, so that the workpiece 12 passes through the shooting position of the camera lens assembly 13; the first light source 14 is arranged between the camera lens assembly 13 and the mobile platform 11, the first light emitted by the first light source 14 extends along the direction perpendicular to the first path of the workpiece 12; the second light source 15 is arranged between the first light source 14 and the mobile platform 11, when the workpiece 12 passes through the second light source 15, the second light emitted by the second light source 15 passes through the workpiece 12 along the direction perpendicular to the first path of the workpiece 12; wherein the first path is the moving path of the workpiece 12 when passing through the camera lens assembly 13.

[0054] The mobile phone cover plate light imaging structure provided by the embodiment of the application comprises a mobile platform 11, a camera lens assembly 13, a first light source 14 and a second light source 15, a workpiece 12 is fixed on the mobile platform 11, the workpiece 12 is driven to move by the mobile platform 11, when the mobile platform 11 drives the workpiece 12 to pass through a photographing position of the camera lens assembly 13, the camera lens assembly 13 cooperates with the first light source 14 and the second light source 15 to collect two images of the workpiece 12 respectively; the same camera lens assembly 13 is used to collect the two images of the workpiece 12, the workpiece 12 does not need to be positioned again, it is ensured that the dirty area in the two images does not change, the accuracy of the dirty position in the two image collection is improved, and then by comparing the two images of the workpiece 12, the interference of dirt on the detection of the automatic detection equipment is effectively reduced, the misjudgment of the detection equipment is reduced, and the accuracy of the detection of the workpiece 12 is improved.

[0055] Further, two images of the workpiece 12 are collected, one of which contains the defects and the lint dust points of the workpiece 12, and the other of which contains only the lint dust points of the workpiece 12, and then the defect area information of the workpiece 12 is positioned by comparing the two images of the same workpiece 12, and the accuracy of the defect detection of the workpiece 12 is improved.

[0056] In a possible implementation, the camera lens assembly 13 comprises a line scan camera and a line scan lens, and the first light source 14 extends along the scanning direction of the line scan camera.

[0057] In the technical solution, the first light source 14 extends along the scanning direction of the line scan camera, ensuring that the illumination in the field of view range of the line scan camera is uniform during the scanning process, avoiding the decline of image quality caused by uneven illumination, optimizing the distribution of the first light source 14, reducing the influence of shadows and glare, cooperating with the camera lens assembly 13 to realize effective imaging of the non-planar workpiece 12, and enabling the first light emitted by the first light source 14 to cover a larger field of view range and capture more image information.

[0058] It can be understood that the camera lens assembly 13 is electrically connected with an image processing system, the line scan lens captures the linear image of the workpiece 12, and then transmits the image to the sensor of the line scan camera, the sensor of the line scan camera reads the image data line by line and converts the image data into an electrical signal, and finally the image processing system processes and analyzes.

[0059] In a possible implementation, the central lighted area of the first light source 14 is the scanning area of the line scan camera.

[0060] In the technical solution, the central highlight area of the first light source 14 is the scanning area of the line scanning camera, so as to reduce the shadow on the surface of the workpiece 12 caused by the angle between the workpiece 12 and the first light source 14, and further improve the imaging quality and effect of the camera lens assembly 13 on the non-planar workpiece 12.

[0061] As shown in Figure 3 , in a possible implementation, the first light source 14 and the second light source 15 are alternately strobed.

[0062] In the technical solution, the first light source 14 and the second light source 15 are alternately strobed to enhance the image features, highlight the defects and specific features such as the edges, textures or shapes of the hair dust and dirt objects in the image, which helps to improve the accuracy of subsequent image analysis and recognition; by controlling the frequency and duration of the strobing of the first light source 14 and the second light source 15, the exposure time of the camera lens assembly 13 can be controlled, and the glare and reflection caused by the over-brightness or non-uniformity of the light source can be reduced, the imaging quality is improved, and then different imaging conditions are adapted, and the imaging quality of the defects and hair dust and dirt of the workpiece 12 is improved.

[0063] It can be understood that the workpiece 12 is a glass cover plate, and the reflectivity of the glass cover plate is high, so that the first light source 14 and the second light source 15 are alternately strobed, and the imaging effect is improved.

[0064] As shown in Figure 3 , in a possible implementation, the camera lens assembly 13 takes a row for each high-level signal received, and the first light source 14 and the second light source 15 are alternately lit once for each high-level signal received.

[0065] In the technical solution, the strobing frequency of the first light source 14 and the second light source 15 is superimposed and consistent with the shutter frequency of the camera lens assembly 13, so that the workpiece 12 can be lit when the camera lens assembly 13 collects the image each time, and the camera lens assembly 13 can collect the image of the workpiece 12.

[0066] As shown in Figure 1 and Figure 2 , in a possible implementation, the second light source 15 and the first light source 14 are arranged on the first plane, and the second light source 15 is located at the side of the shooting position.

[0067] In the technical scheme, the second light source 15 is located at the side of the workpiece 12 at the photographing position and illuminates the workpiece 12, and cooperates with the camera lens assembly 13 to collect the area information of the lint dust point of the workpiece 12; the second light source 15 is located above the first light source 14 and cooperates with the camera lens assembly 13 to collect the area information of the defect and the lint dust point of the workpiece 12, the second light source 15 and the first light source 14 are located on the first plane, so that the moving platform 11 can drive the workpiece 12 to directly pass between the first light source 14 and the second light source 15, the lighting imaging structure is integrated with the conveying device, the occupied space is small, and the original working efficiency of the conveying device is not affected.

[0068] As shown in the figure, in a possible implementation, the first plane is a vertical plane. Figure 1

[0069] In the technical scheme, the first light emitted by the first light source 14 and the second light emitted by the second light source 15 are located on the vertical first plane, so that the area illuminated by the first light and the second light is perpendicular to the upper surface of the workpiece 12, thereby reducing the shadow area generated by lighting, and improving the collection accuracy of the area information of the defect and the lint dust point.

[0070] As shown in the figure, in a possible implementation, the camera lens assembly 13 is arranged at an angle with the first plane. Figure 2

[0071] In the technical scheme, the camera lens assembly 13 is arranged at an angle with the first plane, so as to reduce the light directly reflected to the camera lens assembly 13, reduce the reflection and glare in the image, and better highlight the texture and features of the surface of the defect and the lint dust point, which is helpful to improve the accuracy of subsequent image analysis and recognition.

[0072] As a preferred scheme, the angle between the camera lens assembly 13 and the first plane is 10-15°, and the working distance between the camera lens assembly 13 and the workpiece 12 is 290-310mm. Preferably, the angle between the camera lens assembly 13 and the first plane is 10°, and the working distance between the camera lens assembly 13 and the workpiece 12 is 300mm.

[0073] As shown in the figure, in a possible implementation, the second light source 15 includes two point light sources, the two point light sources are concentrically irradiated, and the two point light sources are symmetrically arranged on both sides of the photographing position. Figure 1

[0074] ​​​In this technical solution, the second light source 15 includes two point light sources. The two point light sources illuminate the workpiece 12 from both sides of the shooting position. The two point light sources are located on both sides of the moving platform 11. The moving platform 11 moves along the trajectory of the conveying device and illuminates the workpiece 12 during the normal conveying process. The camera lens assembly 13 works with the two point light sources to illuminate and capture images of the dust particles, without interfering with the normal operation of the conveying device. The lighting and imaging structure is effectively integrated with the conveying device, saving space.

[0075] Furthermore, the relative distance between the two point light sources is 140–160 mm. Preferably, the relative distance between the two point light sources is 150 mm.

[0076] like Figure 2 As shown, in one feasible implementation, the first light source 14 is disposed perpendicular to the moving platform 11 and extends along a first path perpendicular to the workpiece 12.

[0077] In this technical solution, the first light source 14 is a line light source. The first light source 14 extends along a direction perpendicular to the first path of the workpiece 12. The moving platform 11 moves along the trajectory of the conveying device. The first light source 14 is vertically set above the conveying device. During the normal conveying of the workpiece 12, it illuminates the workpiece 12. The camera lens assembly 13 works with the line light source to illuminate and capture images of imaging defects and dirt spots, without interfering with the normal operation of the conveying device. The lighting and imaging structure is effectively integrated with the conveying device, saving space.

[0078] In one feasible implementation, the first light source 14 is a high-brightness line light source.

[0079] In this technical solution, the use of a high-brightness line light source in conjunction with a line scanning camera helps to enhance the accuracy of identifying the details of the workpiece 12, such as the edges, textures, or shapes of lint, dust, and dirt. At the same time, the strong light provided by the high-brightness line light source can improve the signal-to-noise ratio of the image acquired by the camera lens assembly 13, making the image clearer and the details more obvious, thereby further improving the accuracy of imaging interference from defects and lint, dust, and dirt.

[0080] like Figure 4 As shown, according to a second aspect of this application, a method for lighting and imaging a mobile phone cover glass is proposed, which uses a mobile phone cover glass lighting and imaging structure as described in any of the above technical solutions to perform lighting and imaging on the workpiece 12, including:

[0081] Step 100: Install workpiece 12 on the moving platform 11;

[0082] Step 200: Light up the first light source 14 and the second light source 15;

[0083] Step 300, collecting a first image and a second image of the workpiece 12;

[0084] Step 400, eliminating the region information of the first image according to the second image.

[0085] Through the mobile phone cover light imaging method provided by the embodiment of the application, the workpiece 12 is installed on the mobile platform 11, when the mobile platform 11 drives the workpiece 12 to move to the shooting position of the camera lens module, the camera lens assembly 13 cooperates with the first light source 14 to collect the first image of the workpiece 12, the camera lens assembly 13 cooperates with the second light source 15 to collect the second image of the workpiece 12, and the camera lens assembly 13 collects the first image and the second image in sequence, so as to ensure that the dirty area in the first image and the second image does not change, and the accuracy of collecting the dirty position twice is improved; and then the interference region information in the first image is eliminated through the comparison of the second image of the workpiece 12, so as to reduce the interference of dirt on the detection of the automatic detection equipment, reduce the misjudgment of the detection equipment, and improve the accuracy of detecting the workpiece 12.

[0086] In a feasible implementation, the first light source 14 and the second light source 15 are alternately flashed.

[0087] In the technical solution, the first light source 14 and the second light source 15 are alternately flashed to enhance the features of the first image and the second image collected by the camera lens assembly 13, highlight the defects and specific features such as the edges, textures or shapes of the dust and dirt objects in the image, can effectively form the glass cover plate which is high-reflective and transparent, thereby effectively reducing the misjudgment caused by the surface characteristics of the glass cover plate.

[0088] It can be understood that when the camera lens assembly 13 starts to collect work, the first light source 14 is first lit, and then the second light source 15 is lit; or the second light source 15 can be first lit, and then the first light source 14 is lit, as long as the first light source 14 and the second light source 15 are alternately lit regularly.

[0089] In a feasible implementation, when the workpiece 12 passes through the shooting position of the camera lens assembly 13, the first light source 14 and the second light source 15 are alternately flashed, and the camera lens assembly 13 collects the first image and the second image of the workpiece 12.

[0090] In the technical solution, when the mobile platform 11 drives the workpiece 12 to the shooting position of the camera lens assembly 13, the first light source 14 and the second light source 15 are alternately flashed, and the camera lens assembly 13 collects the first image and the second image of the workpiece 12, so as to ensure that a clear image is obtained when the workpiece 12 passes through the shooting position.

[0091] Furthermore, by controlling the frequency and duration of the flickering of the first light source 14 and the second light source 15, the exposure time of the camera lens assembly 13 can be controlled, and glare and reflection caused by excessive or uneven light sources can be reduced, thereby improving the imaging quality and adapting to different imaging conditions, thus improving the imaging quality of defects and dirt spots on the workpiece 12.

[0092] In one feasible implementation, when the first light source 14 and the second light source 15 are alternately lit by flashing, the camera lens assembly 13 takes a picture of one line for each high-level signal received. The first light source 14 lights up once for each high-level signal received, and the second light source 15 lights up once for each high-level signal received.

[0093] In this technical solution, the camera lens assembly 13 takes a picture of one line for each high-level signal received, and the second light source 15 lights up once for each high-level signal received. The strobe frequencies of the first light source 14 and the second light source 15 are superimposed and are consistent with the shutter frequency of the camera lens assembly 13, ensuring that the workpiece 12 can be lit up every time the camera lens assembly 13 acquires an image, so as to quickly acquire two consecutive images of the workpiece 12, which is beneficial to improving the acquisition efficiency of the first image and the second image.

[0094] Furthermore, the lighting frequency of the first light source 14 is equal to the lighting frequency of the second light source 15, which is equal to 0.5 times the shutter frequency of the camera lens assembly 13.

[0095] It is understandable that when the camera lens assembly 13 receives a high-level signal to take a picture of a line, the first light source 14 lights up once, and then the camera lens assembly 13 receives another high-level signal to take a picture of a line, and the second light source 15 lights up once. Alternatively, when the camera lens assembly 13 receives a high-level signal to take a picture of a line, the second light source 15 lights up once, and then the camera lens assembly 13 receives another high-level signal to take a picture of a line, and the first light source 14 lights up once. It is only necessary to ensure that the first light source 14 and the second light source 15 light up alternately when the camera lens assembly 13 takes pictures.

[0096] In one feasible implementation, the time interval between the alternating illumination of the first light source 14 and the second light source 15 is consistent.

[0097] In this technical solution, the lighting time of the first light source 14 and the second light source 15 needs to be precisely synchronized with the shutter triggering time of the line scan camera. On the one hand, the consistent time interval between the alternating lighting of the first light source 14 and the second light source 15 helps to keep the various parts of the lighting imaging system synchronized, thereby helping to improve the final detection accuracy. On the other hand, when processing the first image and the second image, the consistent time interval between the alternating lighting of the first light source 14 and the second light source 15 can simplify the algorithm design, without having to consider the impact of changes in illumination.

[0098] In an implementation, the camera lens assembly 13 is used to capture a first image of the workpiece 12 under the illumination of the first light source 14, and the camera lens assembly 13 is used to capture a second image of the workpiece 12 under the illumination of the second light source 15.

[0099] In the technical solution, the camera lens assembly 13 is used to capture a first image of the workpiece 12 under the illumination of the first light source 14, and the camera lens assembly 13 is used to capture a second image of the workpiece 12 under the illumination of the second light source 15, the same camera lens assembly 13 is used to capture two images of the workpiece 12 under the illumination of the first light source 14 and the second light source 15 which are alternately flashed, and the images are accurately positioned, so as to improve the accuracy of subsequent elimination of the region information of the second image.

[0100] In an implementation, the first image images defects and lint dust stains of the workpiece 12, and the second image images lint dust stains of the workpiece 12.

[0101] In the technical solution, the first image images defects and lint dust stains of the workpiece 12, and the second image images lint dust stains of the workpiece 12, the same camera lens assembly 13 is used to capture an image of the workpiece 12 containing defects and lint dust stains and an image of the workpiece 12 containing only lint dust stains under the illumination of the first light source 14 and the second light source 15 which are alternately flashed, so that the region of the first image and the second image containing lint dust stains is accurately positioned, and interference information is prevented from deviating to affect the accuracy of elimination of the first image.

[0102] In an implementation, the second image is processed to extract region information of lint dust stains in the second image, and region information of the first image corresponding to the region information of the lint dust stains in the second image is eliminated.

[0103] In the technical solution, the second image is processed to extract region information of lint dust stains in the second image, and the first image is eliminated according to the region information of the lint dust stains in the second image, and the remaining region which is not eliminated is the region where defects of the workpiece 12 are located.

[0104] In an implementation, after the region information of the first image is eliminated according to the second image, the method further includes: obtaining a third image, and detecting defects of the workpiece 12 according to the third image.

[0105] In the technical solution, the first image is eliminated according to the region information of the lint dust stains in the second image, and a third image containing only the region where defects of the workpiece 12 are located is obtained, and defects of the workpiece 12 are detected according to the third image, so that misjudgment caused by lint dust stains on the workpiece 12 is effectively reduced, over-detection caused by lint dust stains in detection is reduced, and the accuracy of defect detection of the workpiece 12 is improved.

[0106] It should be noted that Figure 5 The detection effect diagram of the workpiece 12 before the lint dust point rejection is shown, and the lint dust point dirt greatly interferes with the detection equipment, and the defect over-rejection is serious. Figure 6 For the picture obtained after the first image is rejected according to the lint dust point dirt area information in the second image, a third image is obtained after the picture is processed. Figure 7 The detection effect of the detection equipment after the lint dust point rejection is shown, and the defect over-rejection condition disappears.

[0107] In a feasible implementation, the mobile phone cover plate light imaging method further includes: making the first light emitted by the first light source 14 parallel to the scanning direction of the camera lens assembly 13, and making the central brightening area of the first light source 14 coincide with the scanning area of the scanning of the camera lens assembly 13.

[0108] In this technical solution, the first light is parallel to the scanning direction of the camera lens assembly 13, which helps to enhance the accuracy of identifying the edge, texture or shape of the defect of the workpiece 12 and the lint dust point dirt object; by making the central brightening area of the first light source 14 the scanning area of the line scanning camera, the shadow generated on the surface of the workpiece 12 due to the angle between the workpiece 12 and the first light source 14 can be reduced, and the imaging quality and effect of the camera lens assembly 13 on the non-planar workpiece 12 are further improved.

[0109] In a feasible implementation, the mobile phone cover plate light imaging method further includes: making the second light emitted by the second light source 15 parallel to the scanning direction of the camera lens assembly 13, and making the brightening area of the second light located above the workpiece 12.

[0110] In this technical solution, the second light emitted by the second light source 15 brightens the upper surface of the workpiece 12 on the side of the workpiece 12, distinguishes the lint dust point from the defect, reduces the inaccuracy of the second image acquisition caused by the lint dust point covering the defect, and further ensures the accuracy of the second image acquisition of the lint dust point area information, thereby reducing the misjudgment and over-rejection caused by the lint dust point interference.

[0111] It can be understood that the mobile phone cover plate light imaging method provided by the embodiments of the present application has all the beneficial effects of the mobile phone cover plate light imaging structure of the above-mentioned technical solutions because it is applied to the mobile phone cover plate light imaging structure of any of the above-mentioned technical solutions.

[0112] Those skilled in the art can understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0113] The above merely preferred embodiments of the present application are not used to limit the present application, any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above is merely the preferred embodiment of the present application, it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principle of the present application, a number of improvements and variations can be made, these improvements and variations should also be considered as the protection scope of the present application.

Claims

1. A mobile phone cover plate lighting and imaging structure, characterized in that, The mobile phone cover plate lighting and imaging structure includes: The workpiece is placed on the mobile platform; A camera lens assembly is disposed above the moving platform, and the moving platform drives the workpiece to move so that the workpiece passes the image capture position of the camera lens assembly. A first light source is disposed between the camera lens assembly and the moving platform, and a first light ray emitted by the first light source extends along a direction perpendicular to a first path of the workpiece; A second light source is disposed between the first light source and the moving platform. When the workpiece passes by the second light source, the second light emitted by the second light source passes through the workpiece along a direction perpendicular to the first path of the workpiece. The camera lens assembly, in conjunction with the first light source and the second light source, respectively acquires two images of the workpiece; The first path is the movement path of the workpiece when it passes the camera lens assembly.

2. The mobile phone cover plate lighting and imaging structure according to claim 1, characterized in that, The camera lens assembly includes a line scan camera and a line scan lens, wherein the first light source extends along the scanning direction of the line scan camera.

3. The mobile phone cover plate lighting and imaging structure according to claim 2, characterized in that, The centrally illuminated area of ​​the first light source is the scanning area of ​​the line scan camera.

4. The mobile phone cover plate lighting and imaging structure according to claim 1, characterized in that, The first light source and the second light source are lit alternately in a flickering manner.

5. The mobile phone cover plate lighting and imaging structure according to claim 4, characterized in that, Each time the camera lens assembly receives a high-level signal, it takes one line of images. The first light source and the second light source alternately light up once each time a high-level signal is received.

6. The mobile phone cover plate lighting and imaging structure according to claim 1, characterized in that, The second light source and the first light source are disposed on the first plane, with the second light source located to the side of the photographing position.

7. The mobile phone cover plate lighting and imaging structure according to claim 6, characterized in that, The first plane is a vertical plane.

8. The mobile phone cover plate lighting and imaging structure according to claim 7, characterized in that, The camera lens assembly is set at an angle to the first plane.

9. A mobile phone cover plate lighting and imaging structure according to claim 7, characterized in that, The second light source includes two point light sources, which are concentrically aligned and symmetrically arranged on both sides of the shooting position.

10. A mobile phone cover plate lighting and imaging structure according to claim 7, characterized in that, The first light source is disposed perpendicular to the moving platform and extends along a first path perpendicular to the workpiece.

11. The mobile phone cover plate lighting and imaging structure according to claim 10, characterized in that, The first light source is a high-brightness line light source.

12. A method for imaging a mobile phone cover glass using illumination, characterized in that, The method of using a mobile phone cover plate lighting imaging structure as described in any one of claims 1 to 11 to perform lighting imaging on a workpiece includes: Mount the workpiece on the mobile platform; Light up the first and second light sources; Acquire the first and second images of the workpiece; The region information of the first image is removed based on the second image.

13. A method for imaging a mobile phone cover glass according to claim 12, characterized in that, The first light source and the second light source are lit alternately by flickering.

14. A method for imaging a mobile phone cover glass according to claim 13, characterized in that, When the workpiece passes the camera lens assembly's image capture position, the first light source and the second light source flash alternately, and the camera lens assembly captures the first image and the second image of the workpiece.

15. A method for imaging a mobile phone cover glass according to claim 14, characterized in that, When the first light source and the second light source are alternately lit by flashing, the camera lens assembly takes a picture of one line for each high-level signal received, and the first light source and the second light source alternately light up once for each high-level signal received.

16. A method for imaging a mobile phone cover glass according to claim 15, characterized in that, The time interval between the alternating illumination of the first light source and the second light source is consistent.

17. A method for imaging a mobile phone cover glass according to claim 15, characterized in that, The camera lens assembly, in conjunction with the first light source, illuminates and captures the first image of the workpiece; the camera lens assembly, in conjunction with the second light source, illuminates and captures the second image of the workpiece.

18. A method for imaging a mobile phone cover glass according to claim 17, characterized in that, The first image images the defects and dirt spots on the workpiece; the second image images the dirt spots on the workpiece.

19. A method for imaging a mobile phone cover glass according to claim 18, characterized in that, The second image is processed to extract the hair dust spot region information in the second image, and the region information in the first image that corresponds to the hair dust spot region information in the second image is removed.

20. A method for imaging a mobile phone cover glass according to claim 19, characterized in that, The process of removing region information from the first image based on the second image includes: A third image is obtained, and defect detection is performed on the workpiece based on the third image.

21. A method for imaging a mobile phone cover glass according to claim 12, characterized in that, The mobile phone cover plate lighting imaging method also includes: The first light emitted by the first light source is parallel to the scanning direction of the camera lens assembly, and the centrally illuminated area of ​​the first light source coincides with the scanning area of ​​the camera lens assembly.

22. The method for imaging a mobile phone cover glass according to claim 21, characterized in that, The mobile phone cover plate lighting imaging method also includes: The second light emitted by the second light source is parallel to the scanning direction of the camera lens assembly, so that the illuminated area of ​​the second light is located above the workpiece.

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