Printed matter two-dimensional code image acquisition and detection device

Abstract

The utility model belongs to the technical field of two-dimensional code detection, and particularly relates to a printed matter two-dimensional code image collecting and detecting device.The image collecting device comprises a conveying assembly, a support supporting assembly and a collecting module, and the conveying assembly is a continuous conveying mechanism moving in the set direction and is used for stably conveying a two-dimensional code sample to pass through a detection area; the support supporting assembly is installed above the conveying assembly, and a frame is formed by cross beams and provided with a sliding rail assembly. The acquisition module is assembled on the sliding rail assembly and comprises a hollow shell provided with an image acquisition window, a camera module installed downwards and a plurality of light source modules arranged in the shell around the camera module, and the light emitting direction of the light source modules converges below the optical axis of the camera. According to the two-dimensional code detection device, the problems of an existing two-dimensional code detection device in the aspects of structure adaptability, imaging definition, illumination adaptability and environment anti-interference performance are solved, and clear and anti-interference image collection and detection of two-dimensional code samples of different sizes and materials in various production lines are achieved.

Description

Technical Field

[0001] This utility model belongs to the field of QR code detection technology, specifically, it relates to a device for acquiring and detecting QR code images of printed materials. Background Technology

[0002] With the increasing demand for product information traceability and packaging anti-counterfeiting, the application of QR codes on various printed products is becoming more and more widespread. In order to ensure the recognizability of QR codes in downstream use, the printing quality level of QR codes has become an important control indicator in the production process, especially in scenarios such as high-speed inkjet printing and roll printing, where the need for quality inspection of QR codes is becoming increasingly urgent.

[0003] Currently, QR code quality level testing equipment mainly includes code readers, code verifiers, and code detectors. Code readers are primarily used for QR code decoding, and some models also have the function of outputting printing quality level indicators. While a small number of structured devices with online testing capabilities, such as some industrial verifiers, have emerged on the market, they still face several limitations. First, most of these devices are fixedly installed, resulting in high structural rigidity and a limited adjustment range, making them difficult to adapt to different conveying systems (such as roller conveyors and sheet conveyors). Second, the image acquisition structure is generally a standard camera, and the accompanying lighting devices are mostly fixed-direction or single-type light sources, which can cause glare interference when facing various materials (such as laser paper and metal surfaces), affecting image quality. Third, most systems lack structured calibration mechanisms and light-shielding measures, and the acquisition environment is easily affected by external light sources, impacting the consistency of level assessments.

[0004] In summary, the existing QR code quality level detection devices have the following main problems in terms of structural design: (1) poor compatibility between the detection components and the production line structure, and low versatility; (2) fixed lighting and imaging structures, which cannot be adapted to QR codes of different sizes and materials; (3) lack of effective light shielding and calibration structures, and are easily affected by environmental interference.

[0005] To address the aforementioned issues, there is an urgent need for a QR code image acquisition and detection device with an adjustable structure and strong adaptability. Utility Model Content

[0006] The purpose of this invention is to overcome the shortcomings of existing QR code image acquisition devices in terms of structural adaptability, imaging stability, and environmental interference resistance, and to propose a QR code image acquisition and detection device for printed materials with adjustable structure and strong adaptability.

[0007] This utility model provides a device for acquiring QR code images of printed materials, including:

[0008] The conveying assembly is constructed as a continuous transmission mechanism that moves along a set direction and has a conveying surface for carrying and maintaining the QR code sample through the detection area in a stable state.

[0009] A support bracket assembly is installed above the conveying assembly and includes a frame consisting of at least one crossbeam and a slide rail assembly. The crossbeam is arranged perpendicular to the conveying direction and spans the conveying surface, and the slide rail assembly is installed on it.

[0010] The acquisition module, assembled on the slide rail assembly, includes a housing, a camera module, and a light source module, wherein:

[0011] The outer shell is a hollow cavity structure, and its bottom is provided with an image acquisition window to shield ambient light and stably install the imaging components.

[0012] The camera module is installed inside the top surface of the housing and faces downward toward the image acquisition window;

[0013] Multiple light source modules are disposed inside the housing and arranged circumferentially below the bottom of the camera module, with the light emission direction converging in the area directly below the optical axis of the camera module.

[0014] In a preferred embodiment, the slide rail assembly further includes a guide rail mounted on the crossbeam, and limiting blocks are provided at both ends of the guide rail.

[0015] In a preferred embodiment, the slide rail assembly further includes a slider, which is slidably connected to the guide rail.

[0016] In a preferred embodiment, the slider is further provided with a locking assembly, which includes a screw, a rotating handle, and a pressure block; the front and rear ends of the slider are provided with threaded holes, one end of the screw is equipped with the rotating handle, and the other end passes through the threaded hole of the slider and is connected to the pressure block, which is disposed in the space between the rear end face of the slider and the guide rail.

[0017] In a preferred embodiment, the bracket support assembly further includes a fixing member, which is installed on one side of the front end face of the slider, and the acquisition module is installed on the fixing member.

[0018] In a preferred implementation, the incident angle of the light source module is further 10° to 45° with the horizontal plane.

[0019] In a preferred implementation, the light source module is further selected from one or more of the following structures: coaxial light illumination structure, dome light illumination structure, strip light illumination structure, and hybrid light source module structure.

[0020] In a preferred embodiment, the conveying assembly further adopts a flat conveying structure or a roller conveying structure.

[0021] A printed matter QR code image detection device, wherein the printed matter QR code image detection device is used to process and analyze the QR code image acquired by the printed matter QR code image acquisition device described in any one of the above-mentioned claims.

[0022] The printed QR code image detection device includes an image processing and analysis module and a data display and interaction module; the image processing and analysis module is communicatively connected to the camera module and the data display and interaction module, respectively.

[0023] The beneficial effects of this utility model are:

[0024] Firstly, this utility model's printed QR code detection device addresses the problems of poor structural versatility, blurred imaging, limited illumination methods, strong environmental interference, and lack of feedback control in existing technologies. By constructing a data acquisition module comprising an adjustable positioning system, a housing, a replaceable lens, and a multi-angle adjustable light source module, it achieves stable image acquisition and structural detection of QR code samples of different sizes and materials under motion, effectively improving the device's adaptability to various production lines, including sheet-fed and roller-fed lines. The data acquisition module can be slidably adjusted along a crossbeam to meet the needs of multi-code layout detection; the light source module is located inside the housing, and the incident angle can be set by adjusting the bracket to adapt to samples with different reflective materials, effectively improving image quality; the camera module and optical lens are installed vertically downwards, combined with a light-shielding housing design to suppress external stray light interference and improve acquisition consistency; simultaneously, the system integrates an image processing and analysis module and a data display and interaction module, realizing the visual presentation and real-time feedback of detection information, providing decision support for online coding quality control, and possessing good structural flexibility, environmental adaptability, and industrial practicality.

[0025] Secondly, in the preferred implementation, the guide rail of this utility model is provided with limit blocks at both ends to prevent the slider from derailing and enhance the safety of operation. With the slider assembly with embedded ball structure, low friction and high stability sliding can be achieved on the guide rail. The position is fixed by the locking component set on the slider, and the stable installation position of the image acquisition module can still be maintained under vibration conditions.

[0026] Third, in the preferred implementation, the locking structure of this utility model uses a through-hole threaded hole inside the slider and a screw-driven pressure block, allowing the operator to control the axial movement of the pressure block between the slider and the inner wall of the guide rail by rotating the handle, thus achieving rapid locking and releasing of the slider. This structure is simple and easy to adjust, avoiding the complex structure or multi-point operation required for overall slider clamping in traditional locking methods; the pressure block directly presses against the inner wall of the guide rail under the drive of the screw, forming a stable and strong surface contact friction force within a limited space, effectively preventing the slider from slightly shifting or loosening during equipment operation.

[0027] Fourth, in the preferred implementation, the incident angle of the light source module of this utility model is set to 10° to 45° with the horizontal plane, so that it has the ability to adapt to the surface reflection characteristics of QR code samples of different materials. The illumination direction can be flexibly adjusted according to the gloss, texture roughness and background contrast of the sample, thereby effectively suppressing reflection interference or enhancing edge clarity.

[0028] Fifth, in the preferred implementation, the light source module of this utility model is selected from one or more of the following: coaxial light illumination structure, dome light illumination structure, strip light illumination structure, or hybrid light source module structure, which enables the device to have good illumination adaptability and imaging consistency. By flexibly selecting different illumination structures, it can effectively cope with the differences in materials, surface textures, and reflective properties of QR code samples. For example, coaxial light illumination is suitable for highly reflective or metallic samples and can eliminate specular reflection interference; dome light illumination can provide uniform diffused light, which is suitable for detecting textured or uneven surfaces; strip light illumination has the advantages of strong directionality and high edge contrast, which is suitable for clear identification of ordinary paper materials; while the hybrid light source structure can combine the advantages of different illuminations and flexibly switch or combine them according to the actual application scenario, which can greatly improve the image acquisition quality and detection robustness under multi-category and mixed-line production conditions, and enhance the system's versatility and industrial adaptability. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a QR code detection device for printed materials according to an embodiment of this utility model;

[0030] Figure 2 This is a three-dimensional structural diagram of the bracket support assembly according to an embodiment of the present utility model;

[0031] Figure 3 This is a front view of the bracket support assembly according to an embodiment of the present invention;

[0032] Figure 4 yes Figure 3 Sectional view at point AA;

[0033] Figure 5 This is a front view schematic diagram of the layout of the light source module of the acquisition module according to an embodiment of this utility model;

[0034] Figure 6 This is a top view schematic diagram of the layout of the light source module of the acquisition module in an embodiment of this utility model.

[0035] The components are as follows: 1-Conveying assembly; 2-QR code sample; 3-Support assembly; 30-Frame; 300-Crossbeam; 31-Fixed component; 32-Slide rail assembly; 320-Guide rail; 321-Slider; 322-Ball bearing; 323-Screw; 324-Rotating handle; 325-Pressure block; 4-Acquisition module; 41-Housing shell; 42-Camera module; 43-Optical lens; 44-Light source module; 5-Image processing and analysis module; 6-Data display and interaction module. Detailed Implementation

[0036] To enable those skilled in the art to better understand the technical solutions of this application, the following will provide a more detailed description of this application in conjunction with the accompanying drawings and embodiments.

[0037] In the description of this application, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can mean a fixed connection, a detachable connection, or an integral connection; "link" can mean a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0038] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0039] In the description of this specification, the terms "one embodiment / mode," "some embodiments / modes," "specific embodiment / mode," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example, which is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples.

[0040] As per the instruction manual Figure 1This application discloses a QR code detection device for printed materials, particularly suitable for industrial production scenarios such as packaging printing and coding recognition. It enables standardized monitoring of QR code quality and real-time feedback control of detection results, effectively improving the efficiency and controllability of quality management in the production process. The QR code detection device includes a conveying component 1, a support component 3, and a data acquisition module 4. The conveying component 1 has a conveying surface extending along a set direction, forming a carrying and conveying channel for the QR code sample 2, used to stably and continuously convey the sample to be detected to below the data acquisition module 4. The support component 3 is horizontally mounted above the conveying component 1, and its structure is designed as a beam-type frame 30, equipped with a slide rail component 32. The slide rail component 32 is used to support and adjust the horizontal position of the data acquisition module 4. The data acquisition module 4 is mounted on the slide rail component 32, positioned above the movement path of the QR code sample 2.

[0041] Furthermore, the acquisition module 4 includes a camera module 42, an optical lens 43, and a light source module 44. The optical lens 43 is fixedly mounted below the light outlet of the camera module 42 and is used for optical focusing of the QR code image. The light source modules 44 are evenly distributed around the bottom of the optical lens 43. The incident angle of the light source modules 44 is oriented according to the design parameters towards the area directly below the optical axis center of the optical lens 43 to provide uniform, high-contrast illumination conditions and effectively suppress interference from sample surface reflection.

[0042] In the specific implementation of this application, the conveying component 1 can be selected to adopt a flat tension structure or a roller structure according to the actual production line type, so as to improve the adaptability and versatility of this device in various printing and packaging scenarios.

[0043] The flat conveyor structure is mainly suitable for the inspection process of sheet printed materials or single-sheet label products, and is typically used in digital printing, labeling, and packaging box coding. The flat conveyor structure includes a conveyor platform, drive rollers, driven roller assembly, synchronous belt, and servo motor. The conveyor platform is a horizontally arranged flat conveyor belt, which can be made of anti-static material or high-friction rubber to ensure the stability of single samples during transport. Drive rollers and driven roller assembly are located below the conveyor platform, achieving precise linear transport through the synchronous belt and servo motor.

[0044] Roller conveyor structures are primarily suitable for QR code detection in continuous roll paper processing or high-speed inkjet printing lines, such as in flexible packaging films, cardboard box unfolding sheets, and roll-to-roll coding systems. A roller conveyor structure includes a main conveyor assembly, sprockets, a drive shaft, and a servo motor. The main conveyor assembly consists of multiple sets of conveyor rollers, evenly arranged to form a continuous transmission platform. The rollers are connected to the drive shaft via sprockets or couplings and are driven by a servo motor, allowing for precise speed control based on actual detection requirements. QR code samples adhere to the roller surface through friction or negative pressure adsorption, preventing slippage or vibration during high-speed operation.

[0045] In the specific implementation of this application, as shown in the appendix to the specification... Figure 2-4 The support assembly 3 also includes a fastener 31. The frame 30 of the support assembly 3 has at least one crossbeam 300 for supporting and connecting the support assembly 3 and the acquisition module 4. The crossbeam 300 is a one-piece rectangular metal profile with grooves machined on its surface for mounting the slide rail assembly 32. In another implementation, to improve the structural versatility of the device and the expandability of the acquisition module 4, the crossbeam 300 can also adopt a parallel arrangement of two guide rails 320, enabling simultaneous installation and independent adjustment of multiple modules.

[0046] The slide rail assembly 32 is installed on the upper or side surface of the crossbeam 300 to achieve precise adjustment and stable positioning of the acquisition module 4 in the lateral direction. Specifically, the slide rail assembly 32 includes a guide rail 320, a slider 321, bolts, and a locking nut. The guide rail 320 is arranged along the length of the crossbeam 300 and is a long strip of aluminum alloy or stainless steel precision track with good guiding accuracy. The guide rail 320 is fixedly connected to the crossbeam 300 by countersunk screws or dovetail grooves. The mounting surface is machined flat to ensure smooth movement. Limit blocks 326 are provided at both ends of the guide rail 320 to prevent the slider 321 from derailing due to overtravel. The upper and lower inner surfaces of the guide rail 320 are provided with slide rails, which are a certain distance from the rear end face inside the guide rail 320. The slider 321 is a rectangular support seat installed on the guide rail 320. Its upper and lower ends are fitted with ball bearings 322 or roller rolling structures that abut against the inner side of the guide rail 320, enabling low-resistance linear sliding on the guide rail 320. The front end face of slider 321 is provided with a threaded mounting hole or quick-release slot for connection with the fixing component 31, and the acquisition module 4 is installed on the fixing component 31. A through threaded hole is provided from the front end face to the rear end face of slider 321. The locking structure can be a locking assembly, spring clamp, or cam locking structure, featuring rapid release and high stability. Taking the locking assembly as an example, it includes a screw 323, a rotating handle 324, and a pressure block 325. The first end of the screw 323 is provided with the rotating handle 324, and the other end passes through the threaded hole of slider 321 and connects to the pressure block 325. The pressure block 325 is located between the rear end of slider 321 and the rear end face inside guide rail 320; that is, the space between the slide rail on guide rail 320 and the rear end face inside guide rail 320 is used to accommodate the pressure block 325. Once the slider 321 is in the desired position, the operator rotates the handle 324 clockwise. The pressure block 325 gradually presses against the rear end face inside the guide rail 320, causing the screw 323 and pressure block 325 to apply a vertical force to the rear end face inside the guide rail 320. This generates strong friction between the pressure block 325 and the guide rail 320, effectively locking the slider 321 in place. Preferably, the pressure block 325 can adopt a nested structure of "steel body + non-metallic pressing surface" to improve wear resistance and vibration resistance. The contact surface between the pressure block 325 and the guide rail 320 is made of polytetrafluoroethylene (PTFE) or PA66 + glass fiber reinforced nylon (PA66-GF30), which has the following advantages: 1. Moderate coefficient of friction, providing a good "locking" effect; 2. Does not damage the surface of the guide rail 320, especially suitable for anodized aluminum tracks; 3. Good wear resistance, oil resistance, and chemical corrosion resistance. The main body of the 325 pressure block is made of 304 stainless steel or carbon steel electroplated material. Its advantages are: 1. Ensuring the overall structural strength and stress stability; 2. Corrosion resistant and not easily deformed.

[0047] In the specific implementation of this application, the acquisition module 4 also includes a housing 41, which serves multiple functions such as light shielding, dust prevention, interference resistance, and stable installation. It is one of the key structures ensuring image acquisition quality and component operational reliability. The housing 41 is connected to the fastener 31 via a pre-installed mounting flange on its top or side. The preferred connection method is screw through-hole fixing combined with a locating pin, with the housing connecting to the threaded hole on the fastener through a through-hole. Optional buffer washers or shock-absorbing pads can also be added to improve vibration resistance.

[0048] The housing 41 has a hollow cavity structure, preferably made of anodized aluminum alloy or matte-coated steel plate, providing good structural rigidity and electromagnetic interference resistance. The top and sides of the housing 41 are closed, while the bottom is open, and it is manufactured using a one-piece molding or welding structure to prevent interference from external light source modules. The bottom opening of the housing 41 forms a QR code image acquisition window, the size of which is designed according to the field of view of the optical lens and the size of the detection area. Preferably, the surface of the housing 41 is treated with a matte black coating to absorb excess light and reduce internal reflection interference. Optionally, the housing has internal heat dissipation holes or air ducts to maintain the normal operating temperature of the camera module.

[0049] The camera module 42 is fixed to the inner top surface of the housing 41 in an inverted manner (i.e., the camera module's optical lens faces downwards) via a mounting base on the top of the housing 41. The inner top surface of the housing 41 has an array of screw holes to support precise alignment and installation of the camera module. Furthermore, a flexible shock-absorbing pad can be placed between the camera module 42 and the housing 41 to absorb vibrations and prevent image blurring. The signal and power cables connecting the camera module 42 to the image processing and analysis module 5 are led out through side holes in the housing 41 and are equipped with sealed soft sheaths or EMI electromagnetic shielding interfaces to ensure stable data transmission.

[0050] Preferably, the camera module 42 supports high-speed rapid capture functionality. It is equipped with a high-shutter-speed and high-sensitivity image sensor (e.g., CMOS or CCD type), and combined with a built-in short-exposure control program, it can quickly acquire images when the QR code sample passes through the detection area at a speed of approximately 5 m / s. The short-exposure control program is preset to automatically trigger the camera module to perform the following actions when the QR code sample is detected about to enter the image acquisition area: controlling the exposure time between 50 microseconds and 200 microseconds to avoid image blur; adjusting the shooting frame rate according to the location of the QR code (e.g., increasing it to 300 frames per second); and providing a synchronous trigger signal for image acquisition in conjunction with a position sensor or photoelectric detection device.

[0051] The optical lens 43 is screwed onto the standard C-type or CS-type interface at the bottom of the camera module 42. The optical lens 43 can be a fixed-focus type or an adjustable-focus type, and is equipped with a focus ring and a limiting screw on the outside. The axis of the optical lens 43 points vertically to the center of the bottom opening of the housing 41 to ensure that the shooting area is aligned with the optical axis and to avoid distortion.

[0052] In the preferred implementation of this application, as shown in the appendix to the specification... Figure 5-6 As shown, the light source module 44 is located inside the housing 41 and arranged circumferentially below the bottom of the camera module 42. Multiple sets of light source modules 44 are arranged in a ring or rectangular symmetrical manner around the optical axis center of the optical lens 43. The incident angle of the light is directed towards the center of the acquisition area where the focal point of the optical lens 43 is located, so that the illumination and imaging directions form a synergistic effect. It is directly fixed inside the housing or on an independent bracket inside the housing, and projects light towards the QR code sample area through a set installation angle. This structure facilitates adjustment of the incident direction, adapts to samples of various materials, and is beneficial for heat dissipation and maintenance, improving the illumination consistency and system reliability of image acquisition.

[0053] To achieve optimal illumination of the QR code image area, the incident angle of the light source module is a preset angle α. The preset angle α is the angle between the light emitted from the light source module and the optical axis of the optical lens (i.e., the direction perpendicular to the sample surface). This angle determines whether the light is incident perpendicularly (0°) or "obliquely" onto the QR code surface at a certain slope. The preset angle α is set within the range of 10° to 45°, preferably 20° to 30°. Taking different materials of QR code sample 2 as examples: If QR code sample 2 is coated paper or has a matte finish, the preset angle α is preferably in the range of 10°–20° (low incident angle), with the light illuminating at a shallow oblique angle, enhancing the contrast of the QR code edge shadows, suitable for low-contrast printed materials. If QR code sample 2 is white cardboard, laminated label, or has a partially holographic surface, the preset angle α is preferably in the range of 20°–30°, forming uniform illumination while balancing reflection suppression and edge clarity, suitable for most materials. QR code sample 2 has a metallic luster, gold and silver card, and UV inkjet printing surface. The preset angle α range is preferably 30°–45° (high incident angle) to reduce optical lens reflection glare, which is suitable for highly reflective materials.

[0054] Furthermore, the light source module 44 is fixed to the outer ring area of ​​the acquisition window of the housing 41 by a bracket with an adjustable angle structure. The adjustable angle structure can be fixed by means of universal ball joint, hinge arm, oblique sliding groove, etc., so that each light source module unit can be finely adjusted around its installation axis to set the required incident angle α.

[0055] To accommodate QR code samples with different materials, different reflective properties, and different lighting requirements, the structure of the light source module 44 in this application can be configured into the following typical forms according to the actual application environment: coaxial light illumination structure, dome light illumination structure, strip light illumination structure, and hybrid light source module structure.

[0056] The coaxial illumination structure uses a beam splitter or semi-reflective mirror mounted below the optical lens to refract and converge light from the side light source modules directly below the optical lens axis. The light source modules are symmetrically arranged, and a light guiding system (such as optical fiber or light guide column) guides the light to the optical axis region of the optical lens, forming collimated illumination. During installation, the beam splitter or light guide assembly is housed inside the housing and secured to it via replaceable slots. The light source modules are mounted inside the housing via adjustable brackets, with the angle finely adjusted to match the incident light direction, ensuring an unobstructed imaging path and guaranteeing high-quality image acquisition by the camera module. This structure achieves illumination in the same direction as the optical lens axis, effectively eliminating highlights and interfering shadows on highly reflective surfaces such as metals and plastics. It is suitable for detecting glossy materials, coated surfaces, or QR codes coated with varnish.

[0057] The dome-shaped illumination structure is a hemispherical illumination dome with LED beads evenly distributed inside. The light source module generates multiple diffuse reflections through the inner wall of the dome, ultimately projecting omnidirectional, soft, and uniform diffused light onto the QR code sample through the lower opening. The optical lens 43 is located above the center of the dome dome, aligned with the central field of view. During installation, the dome dome is fixed to an adjustable mounting bracket inside the outer shell 41 via a flange or quick-release structure, allowing for replacement and modular maintenance. An optical lens exit hole ensures an unobstructed field of view. The LED beads can be configured with multiple color temperatures to adapt to different printing materials. It is particularly suitable for samples with uneven surfaces or high diffuse reflection, such as laser paper and gold / silver cards, eliminating sharp shadows and enhancing the stability of QR code edge features.

[0058] The strip lighting structure consists of multiple linear LED strips symmetrically installed inside the housing. The illumination direction of the strips can be set to low-angle oblique or direct incidence by adjusting the installation angle, allowing for flexible configuration according to detection requirements. During installation, each strip light source module is fixed to an adjustable-angle mounting bracket, which is located around the perimeter of the housing. The lamp body has an adjustable tilt angle, with the illumination direction pointing directly below the optical lens's output axis. The strip lighting structure is relatively low-cost and suitable for printing QR codes on matte paper, ordinary coated paper, and other materials with clear backgrounds. It provides concentrated illumination with high contrast, making it suitable for high-resolution recognition and edge enhancement processing.

[0059] The hybrid light source module structure combines two or more of the aforementioned light source modules, such as bar light + coaxial light, or dome light + bar supplementary light. The light source modules are arranged around the optical lens 43 and installed on the support structure inside the housing 41. Timing control or brightness weighting is achieved through a software system. During installation, each type of light source module 44 has independent circuitry and control interfaces. The image processing and analysis module can automatically switch illumination modes according to the sample type. The housing 41 contains multi-functional guide rails or grooves for easy and quick replacement or adjustment of various light source modules. This hybrid light source module structure improves the system's adaptability to various materials and scenarios, eliminating the need for frequent hardware replacements. It enables automatic matching and closed-loop control, making it particularly suitable for multi-variety mixed-line QR code detection environments.

[0060] By combining different types of light source modules 44 in the illumination structure design, the brightness uniformity, edge contrast, and anti-reflective capability of the QR code sample 2 image acquisition can be improved. This design scheme takes into account structural flexibility, image stability, and industrial maintainability, and has good application prospects in high-speed online inspection environments.

[0061] In a preferred embodiment of this application, the focal length of the optical lens 43 is interchangeable based on the QR code size. The optical lens 43 preferably uses a C-interface or CS-interface for modular quick-installation and removal. When replacing the optical lens, the original optical lens can be removed and a new focal length optical lens installed by rotating the optical lens mount. The optical lens has a focal length marking and alignment slot to ensure correct installation. After replacing the optical lens, refocusing can be quickly completed using a preset focal length adjustment travel limiter, avoiding repeated adjustments. Furthermore, a database of five built-in optical lens parameters in the image processing and analysis module can automatically retrieve corresponding parameters (such as field-of-view calibration, distortion correction coefficients, etc.) after replacing the optical lens to improve image quality consistency.

[0062] Optical lens 43 can be either a fixed-focus optical lens or an industrial zoom optical lens, featuring high resolution (≥5MP) and low distortion, supporting clear imaging at close range. To meet the imaging needs of QR codes of different sizes (such as 7×7mm, 10×10mm, 15×15mm, 20×20mm, or even larger or smaller sizes), the focal length configuration principle of the optical lens is as follows: For QR code sample 2 with a size range of 5mm to 10mm, the focal length of optical lens 43 is 16mm to 25mm, providing a small field of view and rich image details, suitable for ultra-small QR codes, such as small packaging and label QR codes. For QR code sample 2 with a size range of 10mm to 20mm, the focal length of optical lens 43 is 12mm to 16mm, providing a medium field of view and stable imaging, suitable for conventional inkjet printing scenarios, balancing clarity and depth of field. The size range of QR code sample 2 is 20mm to 30mm, and the focal length of optical lens 43 is 8mm to 12mm. It has a large field of view and a wide acquisition range, making it suitable for large labels or multi-code side-by-side detection scenarios.

[0063] Optionally, the front end of the optical lens 43 can be fitted with filters (infrared filters, polarizing filters) to improve image contrast depending on the background material of the QR code. For scenes with large depth of field (such as materials with slight height differences in the QR code position), a telecentric optical lens can be selected to maintain image consistency at different heights.

[0064] This invention also provides a printed QR code image detection device, which processes and analyzes QR code images acquired by a printed QR code image acquisition device. The detection device includes an image processing and analysis module 5 and a data display and interaction module 6. The image processing and analysis module 5 is communicatively connected to the acquisition module 4, and is used to receive image data of the QR code sample 2 acquired by the camera module in real time, and to perform edge enhancement, localization extraction, decoding recognition, and quality level determination on the QR code sample 2 according to a built-in preset image processing and analysis program. The data display and interaction module 6 is communicatively connected to the image processing and analysis module 5, and is used to graphically display the analysis results and output statistical data.

[0065] In the specific implementation of this application, the image processing and analysis module 5 integrates functions such as image processing, quality assessment and data output. It can perform real-time quality level assessment on the QR code image acquired by the acquisition module 4 according to the international standards for QR code quality detection, especially the ISO / IEC 15415:2020 standard, and output the final level result.

[0066] It should be noted that the image processing and analysis module 5 supports setting different standard versions (such as ISO / IEC 15415, GB / T 21334, etc.), which facilitates adaptation to different regional or industry standards.

[0067] The image processing and analysis module communicates in real time with the camera module of the acquisition module, triggering the analysis process after image acquisition. The processing follows a pipeline mode of simultaneous acquisition and analysis, ensuring stable operation even on high-speed production lines (e.g., 2.5m / s to 5m / s). The analysis results are sent to the data display and interaction module 6 for synchronous display and are linked to control warning devices or coding equipment, completing closed-loop feedback control.

[0068] Specifically, the image processing and analysis module 5 includes an image preprocessing unit, a QR code recognition and localization unit, a quality level evaluation unit, and a quality level output and judgment unit. The image preprocessing unit performs edge enhancement, noise reduction, and grayscale normalization on the acquired image to improve subsequent recognition stability. The QR code recognition and localization unit identifies the approximate area of ​​the QR code and accurately locates its four positioning markers based on feature templates or shape detection algorithms. The quality level evaluation unit performs a quantitative evaluation of the QR code according to multiple quality parameters specified in the standard. The quality level output and judgment unit converts the evaluation index scores into a quality level and outputs the final quality level.

[0069] Based on the evaluation indicators of the ISO / IEC 15415 standard, the image processing and analysis module 5 supports quantitative calculation and scoring of QR code quality attribute indicators, including but not limited to: symbol contrast (reflecting the grayscale difference between the bright and dark areas of the QR code), modulation (evaluating the grayscale transition quality between bright and dark edges), grid offset (detecting the center offset of the detection module), decoding capability (whether the QR code can be successfully decoded), fixed graphic damage (whether the QR code locator area is damaged), distortion (whether the pattern is compressed or stretched), and no error correction codewords used (evaluating the redundancy of the error tolerance range). Each indicator is scored according to the grading system defined in the standard, with a score range of A (5) to F (0), where A is the best and F is unqualified. The image processing and analysis module 5 summarizes all the scoring indicator results and uses the "lowest grade value method" for final judgment, that is, the lowest grade among all evaluation parameters is taken as the overall quality grade of the QR code. If the grade is lower than the preset qualified standard (for example, the threshold is set to C or above), the QR code is judged as unqualified.

[0070] In the specific implementation of this application, the data display and interaction module 6 is an integrated human-computer interaction interface, which is used to receive and display the QR code image detection results, level information and its operating status data output by the image processing and analysis module 5 in real time. It has multi-dimensional data presentation capabilities, an abnormal alarm mechanism and the function of storing and exporting detection data, providing operators with intuitive, dynamic and traceable monitoring and decision support.

[0071] Specifically, the data display and interaction module 6 includes an industrial touchscreen or embedded display terminal, an image rendering and processing unit, and an interactive control program. The industrial touchscreen or embedded display terminal has a 7-15 inch high-resolution display interface and supports capacitive or resistive touch operation. The image rendering and processing unit is connected to the image processing and analysis module via a communication interface (such as Ethernet, RS485, CAN, etc.) to receive image and detection data streams in real time. The interactive control program embeds human-machine interface software developed based on QT or HTML5, supporting multi-view switching, parameter configuration, and operation command issuance.

[0072] The data display and interaction module's interface design follows industrial UI standards, employing a multi-area information layered layout to support visualized content output, including real-time detection result display, historical trend charts, and statistical analysis. Real-time detection result display includes: an image window area: displaying the current frame's QR code image in real-time, supporting zoom, pause, and scrolling; a grade overlay layer: marking QR code areas in the image with bounding boxes, displaying their corresponding quality grades (e.g., A / B / C), and distinguishing between qualified and unqualified by color; location information annotation: marking the coordinates of the QR code in the sample image for easy traceability; sample number and timestamp display: used to track data from specific batches or production periods. Historical trend charts and statistical analysis include: a trend curve chart: continuously displaying the QR code detection grade trend within a certain time window, supporting maximum, minimum, and mean analysis; a grade distribution statistical chart: presenting the number and percentage of QR codes at each grade in bar chart or pie chart format; and an anomaly record list: listing all recently detected unqualified sample information (including time, grade, location, etc.).

[0073] This utility model's printed material QR code detection device achieves real-time detection and feedback of the quality level of QR codes on high-speed moving printed materials through the coordinated action of a series of structural modules. Its overall working principle is based on a structural process of conveying, positioning, data acquisition, analysis, and feedback display. The specific working principle is as follows:

[0074] Calibration preparation of the acquisition module. Before the initial operation of the device, the operator places the standard grayscale calibration block on the sample bearing surface of the conveying component 1 and adjusts the vertical height and alignment position of the acquisition module 4 so that it is directly aligned with the calibration block. At this time, the light source module 44 in the acquisition module lights up, and the illumination area coincides with the imaging area of ​​the camera module 42, completing the illumination consistency verification. The camera module is fixed to the top surface inside the housing 41, with the optical lens 43 pointing vertically downwards, acquiring the grayscale image after being illuminated by the light source module. This process ensures that the image grayscale is within the set range, providing a stable foundation for subsequent QR code detection.

[0075] Sample transport and image acquisition triggering. During the formal testing process, the sample 2 (printed material) to be tested is moved to the area below the acquisition module 4 via the transport component 1. The transport component can be a flat or roller structure, selected according to the product type, and both have stable transmission and high repeatability. When the QR code sample moves to the set trigger area, the trigger mechanism (which can be a photoelectric switch or encoder linkage) starts a signal to control the light source module 44 to light up and simultaneously start the camera module 42 to acquire images. The light source module 44 is located inside the housing 41 and is arranged circumferentially below the bottom of the lens. It illuminates the QR code area at a specific angle α, which is adjusted by the structural support to align the light incident direction with the focal point of the optical lens, thereby improving the imaging contrast and edge clarity of the QR code. The acquisition module can be precisely positioned laterally via the slide rail component to ensure that the image center always falls on the QR code area.

[0076] QR code image structure detection and grade determination. After the image is acquired, it is sent to the image processing and analysis module 5 via a wired connection. This stage relies entirely on the data acquired from the structure acquisition. The image processing and analysis module, as an independent structure control unit, does not involve software logic: In the image data acquired by the acquisition module, the QR code forms a complete border, internal coding structure, and positioning mark through physical imaging; the edges of the QR code in the image are protected by the lighting set by the acquisition module and the focusing of the optical lens, maintaining structural integrity at high speed; the structure processing unit hands the image to the grade judgment module, which judges the clarity of graphic elements and the flatness of boundaries in the image structure according to the standard detection process (i.e., ISO / IEC 15415, etc.); the detection is based on the structure signal processing output grade result, A is the best, F is the lowest, and the final grade is based on the lowest grade among the various structure detection indicators. If the QR code grade is higher than the quality threshold set by the device (such as grade C and above), it is considered qualified; if it is lower than the threshold (such as grade D or F), an alarm signal will be output to the linkage equipment (such as an audible and visual alarm, inkjet printer control unit) through a preset line to prompt the operator to intervene.

[0077] The test results are displayed in a structured manner and output as data. The test results are transmitted to the data display and interaction module 6 via the communication interface. Through the image overlay function, the QR code image and its corresponding structural grade label, location coordinates, and sample number are displayed on the display terminal. By accumulating physical frame data, the frequency of QR codes of different grades is statistically analyzed and presented in the form of a trend chart on the interface of the data display and interaction module. When unqualified QR codes appear consecutively, the data display and interaction module controls the alarm to output a signal through internal trigger logic, and at the same time records the detection time and location of the corresponding QR code in the anomaly list.

[0078] The entire testing process relies on the coordinated mechanical, optical, and electrical connections between the various structural modules to achieve stable acquisition of QR code images and physical level output. The modules are quickly assembled and disassembled via standard mounting interfaces, providing excellent scalability. The testing process requires no downtime or manual intervention, making it suitable for continuous operation scenarios on high-speed printing production lines.

[0079] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A device for acquiring QR code images of printed materials, characterized in that, The application relates to a printed matter two-dimensional code image detection device. The printed matter two-dimensional code image detection device comprises a conveying assembly (1) configured as a continuous conveying mechanism moving in a set direction, a support assembly (3) installed above the conveying assembly (1), and a collection module (4) assembled on the support assembly (3). The support assembly (3) comprises a frame (30) composed of at least one crossbeam (300) and a sliding rail assembly (32), the crossbeam is arranged across the conveying surface in a direction perpendicular to the conveying direction, and the sliding rail assembly (32) is installed on the crossbeam. The collection module (4) comprises a shell (41), a camera module (42) and a light source module (44), wherein the shell (41) is a hollow cavity structure, the bottom of the shell (41) is provided with an image collection window, the image collection window is used for shielding environmental stray light and stably installing an imaging assembly, the camera module (42) is installed on the inner top surface of the shell (41) and is aligned downward to the image collection window, and a plurality of light source modules (44) are arranged inside the shell (41) and are arranged along the periphery below the bottom of the camera module (42), and the light emitting directions of the light source modules (44) converge in a region directly below the optical axis of the camera module (42). The sliding rail assembly (32) comprises a guide rail (320) installed on the crossbeam (300), and both ends of the guide rail (320) are provided with limiting blocks (326). The sliding rail assembly (32) further comprises a sliding block (321) in sliding connection with the guide rail (320). The sliding block (321) is provided with a locking assembly, the locking assembly comprises a screw rod (323), a rotating handle (324) and a pressing block (325), screw holes are formed through the front and rear end surfaces of the sliding block (321), one end of the screw rod (323) is provided with the rotating handle (324), the other end of the screw rod (323) penetrates through the screw hole of the sliding block (321) and is connected with the pressing block (325), and the pressing block (325) is arranged in a space between the rear end surface of the sliding block (321) and the guide rail (320).

2. The printed matter two-dimensional code image acquisition apparatus according to claim 1, characterized by The support assembly (3) further comprises a fixing piece (31) installed on one side of the front end surface of the sliding block (321), and the collection module (4) is installed on the fixing piece (31).

3. The printed matter two-dimensional code image acquisition apparatus according to claim 2, characterized by The angle between the incident angle of the light source module (44) and the horizontal plane is 10-45 degrees.

4. The printed matter two-dimensional code image acquisition apparatus according to claim 3, characterized by The light source module (44) is selected from one or more structures of coaxial light illumination structure, dome light illumination structure, strip-shaped light illumination structure and mixed light source module structure.

5. The printed matter two-dimensional code image acquisition apparatus according to claim 4, wherein The conveying assembly (1) adopts a flat sheet type conveying structure or a roller type conveying structure.

6. The printed matter two-dimensional code image acquisition apparatus according to claim 1, wherein The printed matter two-dimensional code image detection device is used for processing and analyzing a two-dimensional code image collected by the printed matter two-dimensional code image collection device.

7. The printed matter two-dimensional code image acquisition apparatus according to claim 1, wherein The printed matter two-dimensional code image detection device comprises an image processing and analysis module (5) and a data display and interaction module (6), and the image processing and analysis module (5) is in communication connection with the camera module (42) and the data display and interaction module (6).

8. The printed matter two-dimensional code image acquisition apparatus according to claim 1, wherein ​ 9. A printed matter two-dimensional code image detection device characterized by comprising: ​ ​

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