Color newspaper printing registration device based on machine vision

Abstract

The utility model discloses a machine vision-based color newspaper printing registration device, which comprises a printing registration automatic detection device body and a double-sided synchronous imaging module clamped with a lens of an image acquisition module of the printing registration automatic detection device body, the double-sided synchronous imaging module comprises an objective lens system, a reflector system, a spectroscope and an optical cylinder. According to the utility model, a set of double-sided synchronous imaging module is added in front of the image acquisition lens of the existing registration detection device, and registration marks on the front and back surfaces of the same position of the roll paper are aligned under the combined action of a reflector system and a spectroscope through two oppositely arranged coaxial objective lens systems of the double-sided synchronous imaging module; and meanwhile, the images are overlapped and displayed and are synchronously shot and recorded by the image acquisition lens, so that convenient, economical, rapid and accurate automatic double-sided registration detection and registration regulation for color newspaper printing are realized, and the production quality is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to printing register device technical field, concretely is a kind of color newspaper printing register device based on machine vision. BACKGROUND

[0002] The automatic register technology of color newspaper double-side printing is an important link in modern printing process, ensures that the patterns on the front and back sides can be accurately aligned, so as to ensure the quality of printed matter. With the development of printing equipment and control technology, the automatic register system has gradually changed from traditional manual mechanical adjustment mode to automatic system combining electronic and optical detection and control.

[0003] Current research focuses on using high-precision sensors, camera equipment and image processing algorithms to realize real-time monitoring and adjustment of paper offset, stretching and other phenomena in the printing process. These systems usually identify register marks on the paper through cameras, and make fine adjustments through controlling the cylinders, paper belt transmission and other equipment of the printing machine to ensure the accurate alignment of printed content. In addition, research also involves how to combine these technologies with high-speed printing equipment to meet the needs of modern printing industry for efficient production.

[0004] Although the automatic register technology has made significant progress, there are still some shortcomings. First, the sensitivity and response speed of the equipment are easily affected by paper quality, environmental humidity, machine vibration and other factors in high-speed printing, resulting in decreased register accuracy; second, the complexity and cost of the system are relatively high, which hinders the popularization and application of small and medium-sized printing enterprises; in addition, the existing register system mainly targets single-sheet printing or single-side register detection for rotary printing, and if double-side synchronous detection is required for rotary printing, a set of high-precision sensors and camera equipment need to be added, which significantly increases equipment investment.

[0005] To further improve the automatic register technology of color newspaper double-side printing, develop a more intelligent real-time control system, and at the same time, reduce the complexity and cost of the system to make it more marketable, is an application problem that needs to be solved at present. SUMMARY

[0006] The utility model aims at providing a kind of color newspaper printing register device based on machine vision, by increasing a set of double-side synchronous imaging device before the image acquisition lens of existing camera equipment, realize the convenient, fast, accurate color newspaper printing automatic double-side register detection, to solve the problems raised in the above background technology.

[0007] To solve the above technical problems, the technical solution provided by the utility model is as follows:

[0008] The utility model provides a kind of color newspaper printing register device based on machine vision, including printing register automatic detection device body, and the lens joint of the image acquisition module of printing register automatic detection device body's double-sided synchronous imaging module, the double-sided synchronous imaging module includes objective lens system, mirror system, beam splitter and optical barrel, the optical barrel includes five barrel bodies, wherein the first barrel body and the fifth barrel body are coaxially arranged and do not contact each other and with third barrel body parallel, the second barrel body and the fourth barrel body are arranged in parallel and the second barrel body is vertically communicated and fixed to the end of the first barrel body and third barrel body same side, one end of the fourth barrel body is vertically communicated and fixed to the end of the other end of the third barrel body, the other end of the fourth barrel body is vertically communicated and fixed to the middle part of the fifth barrel body, the objective lens system is coaxially arranged in the opposite two ends of the first barrel body and fifth barrel body, the beam splitter is arranged at the junction of the fourth barrel body and fifth barrel body, and the mirror system includes the first mirror installed at the junction of the first barrel body and second barrel body, the second mirror at the junction of the second barrel body and third barrel body and the third mirror at the junction of the third barrel body and fourth barrel body.

[0009] Further, the objective lens system includes coaxially arranged convex lens, and the light supplement lamp is arranged on the inner wall of the barrel body in front of the convex lens.

[0010] Further, the mirror system is composed of plane mirror and / or right-angle prism.

[0011] The utility model has the advantages that:

[0012] The utility model increases a set of double-sided synchronous imaging module in front of the image acquisition lens of existing register detection device, and the register marks on the same position of front and back of the roll paper are simultaneously superimposed and presented under the joint action of mirror system and beam splitter through the two coaxial objective lens systems oppositely arranged in the double-sided synchronous imaging module, and are synchronously photographed and recorded by image acquisition lens, so that the automatic double-sided register detection and register control of color newspaper printing are realized conveniently, economically, quickly and accurately, so as to ensure production quality. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the optical path structure schematic view of the double-sided synchronous imaging module of the utility model;

[0014] Figure 2 It is the un-registering schematic view of front and back register marks shown by the double-sided synchronous imaging module of the utility model;

[0015] Figure 3 It is the registered schematic view of front and back register marks shown by the double-sided synchronous imaging module of the utility model.

[0016] In the figure: 1. double-sided synchronous imaging module, 11. objective lens system, 111. convex lens, 112. light supplement lamp, 12. mirror system, 121. first mirror, 122. second mirror, 123. third mirror, 13. beam splitter, 14. optical barrel, 141. first barrel body, 142. second barrel body, 143. third barrel body, 144. fourth barrel body, 145. fifth barrel body, 1451. clamping part;

[0017] 2. web, 3. register mark, 31. front register mark, 32. back register mark. DETAILED DESCRIPTION

[0018] In order to make the technical problems solved by the utility model, the technical scheme adopted and the technical effects reached more clear, the technical scheme of the utility model will be further explained below in combination with the drawings and through specific embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the parts related to the utility model are shown in the drawings, not all.

[0019] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or detachably connected, or integrated; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0020] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0021] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0022] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0023] like Figure 1 As shown, this embodiment discloses a color newspaper printing registration device based on machine vision, including a printing registration automatic detection device body (not shown in the figure), and a double-sided synchronous imaging module 1 that is clamped with the lens of the image acquisition module of the printing registration automatic detection device body, the double-sided synchronous imaging module 1 includes an objective lens system 11, a reflector system 12, a beam splitter 13 and an optical tube 14, the optical tube 14 includes five tube bodies, wherein the first tube body 141 and the fifth tube body 145 are coaxially arranged and do not contact each other and are parallel to the third tube body 143, the second tube body 142 and the fourth tube body 144 are parallel to each other, and the two ends of the second tube body 142 are vertically connected and fixed to the same side ends of the first tube body 141 and the third tube body 143, and one end of the fourth tube body 144 is vertically connected. The fourth barrel 144 is directly connected to and fixed at the end of the other end of the third barrel 143, the other end of the fourth barrel 144 is vertically connected to and fixed at the middle of the fifth barrel 145, the objective lens system 11 is coaxially arranged at the two opposite ends of the first barrel 141 and the fifth barrel 145, the spectrometer 13 is arranged at the connection between the fourth barrel 144 and the fifth barrel 145, the other end of the fifth barrel 145 is the clamping part 1451 of the double-sided synchronous imaging module 1, and the reflector system 12 includes a first reflector 121 installed at the connection between the first barrel 141 and the second barrel 142, a second reflector 122 at the connection between the second barrel 142 and the third barrel 143, and a third reflector 123 at the connection between the third barrel 143 and the fourth barrel 144.

[0024] The objective lens system 11 includes a coaxially arranged convex lens 111 and a fill light 112 arranged on the inner wall of the barrel in front of the convex lens 111. The fill light 112 provides uniform and stable lighting conditions, reduces the interference of ambient light on image acquisition, and ensures clear and reflection-free images. In this embodiment, the reflector system 12 is composed of three identical right-angle prisms.

[0025] In use, after the double-sided synchronous imaging module 1 is clamped and fixed on the image acquisition lens (a high-resolution industrial camera is used in the embodiment, which is used to acquire image data of the register marks 3 of the color newspaper printed matter in real time), the web 2 printed with the register marks 3 by the rotary printing machine is passed through the middle of the two same objective lens systems 11 at the ends of the first cylinder body 141 and the fifth cylinder body 145, so that the front register mark 31 is aligned with the objective lens system 11 at the end of the fifth cylinder body 145, and the back register mark 32 is aligned with the objective lens system 11 at the end of the first cylinder body 141. After the supplementary light lamp 112 is turned on, the image of the back register mark 32 passes through the convex lens 111 and is reflected by the mirror system 12 composed of three right-angle prism groups to the beam splitter 13, so that the image of the back register mark 32 is reflected to the image acquisition lens through the beam splitter 13, as shown by the image transmission path of i1 in FIG. 8. Figure 1 The image of the front register mark 31 passes through the convex lens 111 and is directly transmitted to the beam splitter 13, so that the image of the front register mark 31 is transmitted to the image acquisition lens through the beam splitter 13, as shown by the image transmission path of i2 in FIG. 8. Figure 1

[0026] The images of the front register mark 31 and the back register mark 32 are synchronously overlapped and passed through the image acquisition lens, are photographed, and are transmitted to the image processing module of the printing register automatic detection device body through the communication module, so that the original image is processed, such as denoising, gray scaling, and contrast enhancement, and key features such as register marks, edges, and color blocks are extracted from the image. The error detection and analysis module compares the image with the preset reference pattern, calculates the offset or angle deviation of the front register mark 31 and the back register mark 32, and feeds back the detected register error to the control system of the newspaper printing machine in real time, so as to adjust and correct the register, and ensure the accurate register in the double-sided printing process. The image of the register mark 3 photographed each time is recorded by the data recording and analysis module, so that the data detected each time can provide historical traceability of production quality, facilitate quality control and optimization of production, and through statistical analysis of a large amount of printed matter data, possible register problems or trends in the system can be found out, and subsequent production optimization can be performed. The image data after statistical analysis is periodically cleaned to reduce the data storage pressure. As shown in FIG. 9, it is a schematic effect that the front register mark 31 and the back register mark 32 are not completely registered. In order to directly distinguish the front register mark 31 and the back register mark 32 and facilitate automatic adjustment of the register of the corresponding printing color group, in the embodiment, the size of the front register mark 31 is designed as 8*8 mm, and the size of the back register mark 32 is designed as 12*12 mm. Figure 2

[0027] It should be noted that the front register mark 31 and the back register mark 32 are both superimposed by C, M, Y and K.​​Figure 3 As shown, it is a schematic effect that the front register mark 31 and the back register mark 32 are completely registered.

[0028] The above embodiments only illustrate the basic principles and characteristics of the present application, and the present application is not limited to the above embodiments, and various changes and modifications can be made without departing from the spirit and scope of the present application, and these changes and modifications all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A machine vision based color newspaper print register apparatus, characterized by: The printing register automatic detection device comprises a device body and a double-sided synchronous imaging module connected with a lens of an image acquisition module of the device body, the double-sided synchronous imaging module comprises an objective lens system, a mirror system, a beam splitter and an optical barrel, the optical barrel comprises five barrel bodies, the first barrel body and the fifth barrel body are coaxial and not in contact with each other and are parallel to the third barrel body, the second barrel body and the fourth barrel body are parallel, the second barrel body is vertically connected at both ends and is fixed to the same side of the first barrel body and the third barrel body, one end of the fourth barrel body is vertically connected and fixed to the end of the other end of the third barrel body, the other end of the fourth barrel body is vertically connected and fixed to the middle of the fifth barrel body, the objective lens system is coaxially arranged at the two opposite ends of the first barrel body and the fifth barrel body, the beam splitter is arranged at the connection between the fourth barrel body and the fifth barrel body, and the mirror system comprises a first mirror arranged at the connection between the first barrel body and the second barrel body, a second mirror arranged at the connection between the second barrel body and the third barrel body and a third mirror arranged at the connection between the third barrel body and the fourth barrel body.

2. The machine vision based color proofing register apparatus as claimed in claim 1, wherein: The objective lens system comprises a convex lens coaxially arranged and a light supplement lamp arranged around the inner wall of the barrel body in front of the convex lens.

3. The machine vision based color proofing register apparatus as claimed in claim 1, wherein: The mirror system is composed of a plane mirror and / or a right-angle prism.

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