Digital jet printing detection method and system

Abstract

The invention provides a digital jet printing detection method and system. The method comprises the following steps: acquiring a first drive board digital signal of a digital nozzle; acquiring image single-column data based on the first drive board digital signal; obtaining a first verification image based on the image single-column data and a preset original image parameter; and verification is carried out based on the first verification image and the original image, and testing of digital jet printing is realized. The digital jet printing detection method and system provided by the invention can effectively improve the test efficiency and the detection quality of the digital jet printing system by simulating and replacing a method that a traditional digital jet printing system needs to build an actual ink path system in a test stage before leaving a factory, reduce time, manpower and material resource costs, and improve the test efficiency and the detection quality of the digital jet printing system. And a large number of repeated tests on the digital jet printing system can be further evaluated and detected.

Description

Technical Field

[0001] The present invention relates to the technical field of digital printing detection, and in particular to a digital printing detection method and system. Background Art

[0002] At present, digital printing systems need to be tested for accuracy and stability before leaving the factory. After assembling the ink path subsystem, nozzle assembly, and upper computer APP modules of the coding system, the final test step is the most complicated, which requires testing the printing effect and stability of the inkjet. The verification process of the printing effect is currently verified manually. In the existing manual verification, it is achieved by manually placing test materials, nozzle printing, and manually detecting the printing effect. During the entire verification process, the same action needs to be manually operated dozens or even hundreds of times. When a large number of pressure tests need to be performed to verify stability, a rewinder is also required to perform a large number of continuous printing tests, which requires a large amount of rewinding materials.

[0003] The digital printing system needs to build an actual ink system in the test phase before leaving the factory, and a dedicated person is required to load and unload the materials to test the accuracy and stability of the system printing. This traditional verification method consumes ink and test materials. Moreover, under the requirements of large-scale and long-term pressure testing, manual loading and unloading alone is not enough to meet such testing requirements. With the increasing number of product deliveries and the increasingly urgent time requirements, traditional testing methods can no longer meet daily needs. At present, the digital inkjet industry has no better solution to this testing problem. Summary of the invention

[0004] The present invention aims to provide a digital inkjet printing detection method and system to solve the above technical problems and effectively improve the testing efficiency of digital inkjet printing.

[0005] In order to solve the above technical problems, the present invention provides a digital printing detection method and system, comprising the following steps:

[0006] Collecting digital signals from the first driver board of the digital printhead;

[0007] Acquire single-column image data based on the first driving board digital signal;

[0008] Based on the single-column image data and preset original image parameters, a first verification image is obtained;

[0009] Verification is performed based on the first verification image and the original image to implement testing of digital printing.

[0010] In the above scheme, the image single column data is obtained by collecting the digital signal of the first driving board of the digital print head, so that the image is restored based on the image single column data and according to the preset original image parameters to obtain the first verification image, and then the digital printing test can be realized by verification based on the restored first verification image and the original image. Simulation replaces the method of setting up the actual ink path system in the test stage before delivery of the traditional digital printing system, which effectively improves the test efficiency and detection quality, reduces time, manpower and material costs, and can also realize a large number of repeated tests on the digital printing system for further evaluation and detection.

[0011] Furthermore, the collecting of the digital signal of the first driving board of the digital printhead specifically includes: collecting the control data electrical signal of the digital printhead; and acquiring the digital signal of the first driving board based on the control data electrical signal.

[0012] In this process, the electrical signal of the digital printhead is collected and converted to provide reference data for subsequent further processing of the original image.

[0013] Furthermore, the acquiring of the single-column image data based on the first driver board digital signal is specifically: combining the first driver board digital signal into a plurality of single-byte data according to a preset byte combination rule; and acquiring the single-column image data based on the plurality of single-byte data.

[0014] Furthermore, the preset original image parameters specifically include a total column width parameter, a single column byte parameter and a nozzle offset parameter.

[0015] In this process, obtaining the single-column data of the image is a necessary means to subsequently restore the original image.

[0016] Furthermore, the verification is performed based on the first verification image and the original image to implement the test of the digital printing, specifically: the first verification image is verified by determining the consistency between the first verification image and the original image to obtain a verification result; based on the verification result, it is determined whether there are printing defects in the digital printing to implement the test of the digital printing.

[0017] The above scheme is a processing process for the digital printhead driver board electrical signal, by collecting the control data electrical signal of the digital printhead of the digital printing system and converting it into a digital signal, providing reference data for the subsequent acquisition of the image single column data; combining and processing the first driver board digital signal according to the preset rules to form the image single column data, and restoring the original image based on the image single column data and the preset original image parameters to obtain the first verification image; verifying according to the first verification image and the original image to realize the test of digital printing. It can effectively improve the detection efficiency of the digital printing system.

[0018] Furthermore, the original image includes an original verification code.

[0019] It should be noted that the original verification code contained in the original image is unique and can be reverse parsed according to a preset rule. The original verification code can be a QR code, a barcode, etc.

[0020] Furthermore, the verification is performed based on the first verification image and the original image to implement the test of the digital printing, specifically: parsing the first verification image to obtain the first verification code; verifying the first verification image by determining the consistency between the first verification code and the original verification code to obtain the verification result; determining whether there are any printing defects in the digital printing based on the verification result to implement the test of the digital printing.

[0021] In the above scheme, since the original image has a unique original verification code, the consistency of the original image and the first verification image can be verified by judging the consistency of the original verification code and the first verification code, thereby obtaining a verification result and determining the result of the digital printing. If the judgment result is consistent, it means that there is no printing defect in the digital printing; if the judgment result is inconsistent, it means that there is a printing defect in the digital printing.

[0022] Furthermore, the original verification code is unique and complies with a preset rule; the digital printing detection method specifically includes: updating the original verification code according to a preset rule, and updating the original image to obtain a current image; generating a second drive board digital signal based on the current image to obtain a second image single column data, and then obtaining a second verification image, so as to perform verification based on the second verification image and the current image to realize the test of digital printing.

[0023] Furthermore, the verification based on the second verification image and the current image is performed to implement the test of the digital printing, specifically: if the first verification codes obtained by parsing two adjacent tests are the same, it is determined that the digital printing has a duplicate printing defect.

[0024] Furthermore, the verification based on the second verification image and the current image is performed to implement the test of the digital printing, specifically: if the first verification codes obtained by parsing two adjacent tests are different and do not conform to a preset rule, it is determined that there is a missing defect in the digital printing.

[0025] In the above scheme, since the original verification code is unique and should comply with the preset rules, it is possible to update the original image and re-collect the digital signal of the first driver board of the digital printhead, perform data processing and conversion to obtain the second verification image, thereby parsing the first verification code of the current image, and performing consistency judgment on the first verification codes parsed by two adjacent tests. The normal result of digital printing should be that the judgment result is inconsistent and complies with the preset rules. If the judgment result is consistent, it means that the digital printing has a repeated printing defect; if the judgment result is inconsistent and does not comply with the preset rules, it means that the digital printing has a missing defect.

[0026] The present invention also proposes a digital printing detection system for implementing the digital printing detection method, which includes: an analog signal acquisition module for acquiring the digital signal of the first driving board of the digital print head; an image column acquisition module for acquiring a single column of image data based on the digital signal of the first driving board; an image restoration module for acquiring a first verification image based on the single column of image data and preset original image parameters; an image verification module for performing verification based on the first verification image and the original image to implement testing of digital printing.

[0027] Furthermore, the analog signal acquisition module is used to acquire the digital signal of the first driver board of the digital nozzle, including: an electrical signal acquisition submodule, used to acquire the control data electrical signal of the digital nozzle; and an analog-to-digital conversion submodule, used to obtain the first driver board digital signal based on the control data electrical signal.

[0028] Furthermore, the image column acquisition module is used to obtain a single column of image data based on the first driver board digital signal, including: a data grouping submodule, used to combine the first driver board digital signal into a plurality of single-byte data according to a preset byte combination rule; an image column acquisition submodule, used to obtain a single column of image data based on a plurality of the single-byte data.

[0029] Furthermore, the image restoration module is used to obtain a first verification image based on the image single column data and preset original image parameters, specifically: sorting and reorganizing the image single column data based on the preset original image parameters to obtain the first verification image.

[0030] Furthermore, the image verification module is used to perform verification based on the first verification image and the original image to implement a test on the digital printing, and includes: a verification code parsing submodule, used to parse the first verification image and obtain the first verification code; a comparison verification submodule, used to determine the consistency of the first verification code and the original verification code and verify the first verification image to obtain a verification result; a defect judgment submodule, used to determine whether there is a printing defect in the digital printing based on the verification result, to implement a test on the digital printing.

[0031] The above scheme uses the features of the restored first verification image to determine whether there are defects in image printing, whether there are problems such as missing printing defects and repeated printing defects. The verification of these problems saves manpower, material and time costs.

[0032] The above scheme is a digital printing detection system, which works through the functions of various modules. The analog signal acquisition module collects the digital signal of the first driving board of the digital print head, which is processed by the image column acquisition module and the image restoration module to simulate the actual digital printing result, that is, the first verification image. The image verification module then verifies and analyzes the first verification image, and determines whether there are printing defects in the digital printing based on its verification result, which is used to implement the method of digital printing detection.

[0033] The above scheme provides a digital printing detection method and system, which can realize the test of the digital printing system function by collecting and processing the data electrical signal of the first driving board of the digital printhead and further analyzing and judging, without the digital printing system performing actual printing operation, and can also perform a large number of pressure tests to obtain the stability of the digital printing system. It eliminates the need for physical ink path construction and ink use, reduces time and manpower and material costs, and is environmentally friendly. It can also realize a large number of pressure tests on digital printing for evaluation and detection, which can effectively improve detection efficiency and detection quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the implementation mode will be briefly introduced below. Obviously, the drawings described below are only some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A schematic diagram of a digital printing detection method provided by an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of an image verification process provided by an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the structure of a digital printhead of a digital printing system provided by one embodiment of the present invention;

[0038] Figure 4 A schematic diagram of an image section sequence formed based on the image single column data during a detection process of a digital printing detection system provided by an embodiment of the present invention;

[0039] Figure 5 A schematic diagram of a verification process of a digital printing detection system using a QR code as an example provided by an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of a module framework of a digital printing detection system provided by an embodiment of the present invention;

[0041] Figure 7 A schematic diagram of the structure of a digital printing detection system provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] It should be understood that the step numbers used in this document are only for convenience of description and are not intended to limit the order in which the steps are executed.

[0044] It should be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0045] The terms “include” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0046] The term "and / or" means and includes any and all possible combinations of one or more of the associated listed items.

[0047] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] In the detection of digital printing systems, the verification method of the prior art requires manual operation several times. This process consumes a large amount of materials, and under the requirements of large-scale and long-term pressure testing, manpower alone cannot meet such testing requirements. With the increasing number of product deliveries and the increasingly urgent time requirements, traditional testing methods can no longer meet daily needs. Therefore, there is an urgent need for a method and system for detecting digital printing systems, which can effectively improve the detection efficiency and detection quality. Specifically, this embodiment provides a method for detecting digital printing to achieve the detection of the performance and functions of the digital printing system.

[0049] Embodiment 1:

[0050] See also Figure 1 and Figure 2 The embodiment of the present invention provides a method for detecting a digital printing system, which specifically includes the following steps:

[0051] Step S1: collecting a digital signal of a first driving board of a digital printhead, including collecting a control data electrical signal of the digital printhead and acquiring a digital signal of the first driving board based on the control data electrical signal;

[0052] Step S2: acquiring single-column image data based on the first driving board digital signal;

[0053] Step S3: acquiring a first verification image based on the image single column data and preset original image parameters;

[0054] Step S4: Verification is performed based on the first verification image and the original image to implement testing of digital printing.

[0055] Furthermore, the acquisition of the digital signal of the first driver board of the digital printhead is specifically: acquiring the control data electrical signal of the digital printhead; and acquiring the digital signal of the first driver board based on the control data electrical signal. In this process, the acquisition and conversion of the electrical signal of the digital printhead is to provide reference data for the subsequent further processing of the original image.

[0056] Optionally, the signal acquisition conversion can be implemented by a high-speed FPGA chip, which acquires the control data electrical signal of the digital nozzle, including the high-frequency control signal of the digital nozzle and the data electrical signal of the driving nozzle, and then converts it into a digital signal in bits through a built-in analog-to-digital conversion function module. The use of a high-speed FPGA chip to acquire and convert signals is a reverse processing process of the electrical signal of the first driver board of the digital nozzle, which realizes the simulation of the digital nozzle, which is equivalent to an analog nozzle. In actual applications, for the digital nozzle driver board, there is no difference between connecting an analog nozzle and connecting a physical digital nozzle.

[0057] Furthermore, the acquiring of the single-column image data based on the first driver board digital signal is specifically: combining the first driver board digital signal into a plurality of single-byte data according to a preset byte combination rule; and acquiring the single-column image data based on the plurality of single-byte data.

[0058] Furthermore, the preset original image parameters specifically include a total column width parameter, a single column byte parameter and a nozzle offset parameter.

[0059] Furthermore, the verification is performed based on the first verification image and the original image to implement the test of the digital printing, specifically: the first verification image is verified by determining the consistency between the first verification image and the original image to obtain a verification result; based on the verification result, it is determined whether there are printing defects in the digital printing to implement the test of the digital printing.

[0060] Furthermore, the original image includes an original verification code.

[0061] Furthermore, the verification is performed based on the first verification image and the original image to implement the test of the digital printing, specifically: parsing the first verification image to obtain the first verification code; verifying the first verification image by determining the consistency between the first verification code and the original verification code to obtain the verification result; determining whether there are any printing defects in the digital printing based on the verification result to implement the test of the digital printing.

[0062] Furthermore, the original verification code is unique and complies with a preset rule; the digital printing detection method specifically includes: updating the original verification code according to a preset rule, and updating the original image to obtain a current image; generating a second drive board digital signal based on the current image to obtain a second image single column data, and then obtaining a second verification image, so as to perform verification based on the second verification image and the current image to realize the test of digital printing.

[0063] Furthermore, the verification based on the second verification image and the current image is performed to implement the test of the digital printing, specifically: if the first verification codes obtained by parsing two adjacent tests are the same, it is determined that the digital printing has a duplicate printing defect.

[0064] Furthermore, the verification based on the second verification image and the current image is performed to implement the test of the digital printing, specifically: if the first verification codes obtained by parsing two adjacent tests are different and do not conform to a preset rule, it is determined that there is a missing defect in the digital printing.

[0065] In the above scheme, since the original verification code is unique and should comply with the preset rules, it is possible to update the original image and re-collect the digital signal of the first driver board of the digital printhead, perform data processing and conversion to obtain the second verification image, thereby parsing the first verification code of the current image, and performing consistency judgment on the first verification codes parsed by two adjacent tests. The normal result of digital printing should be that the judgment result is inconsistent and complies with the preset rules. If the judgment result is consistent, it means that the digital printing has a repeated printing defect; if the judgment result is inconsistent and does not comply with the preset rules, it means that the digital printing has a missing defect.

[0066] Optional, such as Figure 2 An image verification process shown adopts the method of accumulating error code counter and missing code counter, and based on the judgment result of image verification, the test result of digital printing is counted in real time to realize the detection of digital printing system.

[0067] In the above scheme, the image single column data is obtained by collecting the digital signal of the first driving board of the digital print head, so that based on the image single column data and according to the preset original image parameters, the image is restored to obtain the first verification image, so as to verify according to the restored first verification image and the original image, so as to realize the test of digital printing, and at the same time, the test results of digital printing are counted in real time. The traditional construction of the actual ink path system for detection is converted into simulated printing detection, and the function of automatic verification of the simulated print head can be used to perform a large number of stress tests on the inkjet system, which solves the technical problem that the traditional testing methods can no longer meet the daily needs as the number of product deliveries increases and the time requirements become more and more urgent, and realizes the detection of digital printing systems more quickly and accurately.

[0068] Embodiment 2:

[0069] See also Figure 3 , Figure 4 , Figure 5 and Figure 6 The embodiment of the present invention provides a digital printing detection system, including: an analog signal acquisition module, an image column acquisition module, an image restoration module, a transmission module, a receiving module, an image verification module, a result statistics module and a display module.

[0070] Optionally, in a specific implementation, an embodiment of the present invention provides a digital printing detection system equivalent to an analog nozzle, which is composed of two major parts: an FPGA driver board and a host computer APP. Among them, the FPGA driver board includes an analog signal acquisition module, an image column acquisition module, an image restoration module and a transmission module; the host computer APP includes a receiving module, an image verification module, a result statistics module and a display module.

[0071] In a specific implementation, the analog signal acquisition module includes an electrical signal acquisition submodule and an analog-to-digital conversion submodule, which are used to interface with the digital printing system, i.e., the digital printhead driver board. The electrical signal acquisition submodule acquires the control signal of the digital printhead and the data electrical signal of the drive nozzle from the digital printhead driver board through a chip, and then converts the data electrical signal into a digital signal through a built-in analog-to-digital conversion submodule, thereby realizing the analog effect of the digital printhead through the signal acquisition and conversion of the digital printhead.

[0072] Optionally, the signal acquisition conversion can be implemented by a high-speed FPGA chip, which acquires the control data electrical signal of the digital nozzle, including the high-frequency control signal of the digital nozzle and the data electrical signal of the driving nozzle, and then converts it into a digital signal in bits through a built-in analog-to-digital conversion function module. The use of a high-speed FPGA chip to acquire and convert signals is a reverse processing process of the electrical signal of the first driver board of the digital nozzle, which realizes the simulation of the digital nozzle, which is equivalent to an analog nozzle. In actual applications, for the digital nozzle driver board, there is no difference between connecting an analog nozzle and connecting a physical digital nozzle.

[0073] In a specific implementation, the image column acquisition module includes a data grouping submodule and an image column acquisition submodule, which is used to acquire image single column data based on the first driving board digital signal.

[0074] Generally, digital printheads are divided into multiple rows according to the number of color channels, and each row has several nozzles. After the analog signal acquisition module acquires the digital signal of each nozzle controlled by the printhead driver board, the data grouping submodule combines the first driver board digital signal into several single-byte data according to the preset byte combination rule, and the image column acquisition submodule repeats the reading process until all the byte data sent by the printhead driver board to the printhead are read and the image single column data is formed.

[0075] Optional, with Figure 3 Take the Ricoh G5 printhead shown as an example. The digital printhead is divided into four rows, A, B, C, and D, with 160 nozzles in each row. After acquiring the 2-bit wide digital signal from the printhead driver board to control each nozzle, this module first takes 2-bit data from each of the four rows to form a single byte of printhead data, and then repeats this reading process until all 160 bytes of data sent to the printhead by the printhead driver board are read to form the single-column data of the image, and finally saves it in the cache of the FPGA driver board.

[0076] In the specific implementation process, the image restoration module is used to obtain the first verification image based on the image single column data and the preset original image parameters. The image restoration module reads the image single column data, and according to the preset original image parameters, that is, the total column width of the image, the number of bytes in a single column, the offset of each row of the nozzles and other parameters, the scattered image single column data is reassembled in a preset manner to restore the first verification image.

[0077] In the above solution, obtaining the first verification image is equivalent to the actual printing result of the ink path system constructed by the actual digital printing system.

[0078] Optionally, in the specific implementation process, the image restoration module reads the image single column data from the cache of the FPGA driver board, and then reassembles the scattered image single column data into a complete image in the order of the cache according to the total column width, single column byte number, offset of each row of nozzles and other parameters obtained from the host computer APP. The image node sequence formed by the image single column data can be shown in Figure 4. Figure 3 Take the Ricoh G5 digital print head as an example: if it is configured as 1 head with 2 color channels, the single-column data of the images in rows A and B are assembled into a whole image, corresponding to the grayscale image of the first color; the single-column data of the images in rows C and D form another whole image, corresponding to the grayscale image of the second color. These two images are cached in the FPGA, waiting for the host computer APP to receive them; the host computer APP receives the image data from the FPGA driver board and caches it; when all frames of an image are received, they are combined into a whole image, thereby completing the print image restoration of the printing system and obtaining the first verification image.

[0079] In the specific implementation process, the transmission module is responsible for responding to the instructions sent by the host computer APP and returning the corresponding data of the image in the FPGA driver board cache to the host computer APP.

[0080] In the specific implementation process, the receiving module is used to receive and cache the corresponding image data from the FPGA driver board, and obtain the printing image restoration result of the printing system, that is, the first verification image.

[0081] In the specific implementation process, the image verification module includes a verification code parsing submodule, a comparison verification submodule and a defect determination submodule, which are used to perform verification based on the first verification image and the original image to implement the test of digital printing. The verification code parsing submodule obtains the verification code by parsing the first verification image, and the comparison verification submodule parses the verification code and compares it with the original image to determine whether the current image has printing defects based on whether it is correct (i.e., consistency comparison).

[0082] Furthermore, the verification code parsing submodule updates the original verification code according to a preset rule, and updates the original image to obtain the current image; the comparison verification submodule verifies the first verification image based on the consistency of the first verification code and the original verification code to obtain the verification result; the defect determination submodule determines whether there is a printing defect in the digital printing based on the verification result, and implements the test of the digital printing. If the first verification codes obtained by the comparison verification submodule in two adjacent tests are the same, the defect determination submodule determines that there is a repeated printing defect in the digital printing; if the first verification codes obtained by the comparison verification submodule in two adjacent tests are different and do not conform to the preset rule, it is determined that there is a missing defect in the digital printing; if the first verification codes obtained by the comparison verification submodule in two adjacent tests are different and conform to the preset rule, it is determined that there is no missing defect in the digital printing.

[0083] In the above scheme, the determination of the printing results of the digital printing system and the updating of the current printing results are realized, that is, a large number of repeated tests can be realized, which solves the problem that the coding system will have incomplete individual printed images, missed printing defects and repeated printing defects due to stability problems in the actual mass production process. This problem only occurs occasionally in large quantities, so it is difficult to detect technical problems relying on traditional manual testing.

[0084] Optionally, taking QR code as an example, the verification process of the image verification module may be as shown in the figure. After receiving the first verification image, it is processed according to the verification requirements:

[0085] 1. Verify whether the image has defects:

[0086] In the actual mass production process, the inkjet system may have some incomplete printed images due to stability issues. This problem only occurs occasionally in large quantities and is difficult to achieve through traditional manual testing. By printing the QR code, the simulated print head receives the image and performs a reverse analysis of the QR code. If the image is correct, the content it carries can be correctly analyzed. By comparing the consistency of the content, it is determined whether the current image has defects, that is, whether the inkjet system has printing defects.

[0087] 2. Verify whether there is a leak in the image:

[0088] In the actual mass production process, the inkjet system may have leakage problems due to stability problems when continuously printing under high load. By printing an incremental sequence of QR codes, the simulation nozzle receives the image and performs QR code analysis on the image. By judging whether the sequence of two adjacent prints is continuous, it can be determined whether the inkjet system has leakage defects;

[0089] 3. Verify whether the image has repeated printing problem:

[0090] In the actual mass production process, the inkjet system will have repeated printing due to stability problems when it is continuously under high load. By printing an incremental sequence of QR codes, the simulation nozzle receives the image and performs QR code analysis on the image. By checking whether there is the same inkjet academic degree number in the cache of the previous printing record, that is, whether there is a repeated QR code, it can be determined whether the inkjet system has repeated printing defects.

[0091] When it is determined that the coding system has printing defects, missing defects or repeated printing defects, the error code counter, missing code counter, etc. will count and accumulate.

[0092] The result statistics module performs statistics on the determination results obtained by the image verification module to obtain the image printing defect rate, and transmits the result to the display module;

[0093] The display module receives and displays statistical information such as the image printing defect rate, and displays the current verification image in real time, so that the inspection personnel can intuitively see the entire test process of the inkjet system.

[0094] A digital printing detection system provided by the embodiment of the present invention is specifically: using a high-performance FGPA chip to collect and convert the data electrical signal of the digital nozzle to provide reference data for further processing of subsequent images; using a high-performance FPGA chip according to the function of each pin signal of the nozzle and the parameters such as the ink dot bit width, the number of nozzle rows, and the number of nozzles in each row, the first verification image is reconstructed using a reverse method; using the reverse parsing principle of the QR code, the content of the original image can be directly parsed without the help of other reference data, and this can be used to determine whether the inkjet printing system has a defective image; using the reverse parsing content of the QR code to determine whether the inkjet printing system has a leaking defect; using the reverse parsing content of the QR code to determine whether the inkjet printing system has a repeated printing defect. A more efficient testing method is provided to verify the accuracy and stability of the digital printing system.

[0095] Embodiment three:

[0096] See also Figure 7 An embodiment of the present invention provides an analog nozzle device for detecting a digital printing system, including any one of the above-mentioned methods and systems for detecting digital printing.

[0097] The connection diagram of the simulated nozzle device is shown above. The control system (InkjetPrinter) of the digital printing system is connected to the G5 nozzle driver board (MH_PGL_G5) through Ethernet. The nozzle driver board is connected to the simulated nozzle driver board (MH_G5_Simulation_Board) through an 11-pin wiring interface. Finally, the host computer APP (simulatereceive) is connected to the simulated nozzle driver board through Ethernet.

[0098] The following uses the analog nozzle to detect the repetitive code rate of the digital printing system as an example to illustrate the data processing flow of the analog nozzle: the control system of the digital printing system automatically generates a string of fixed length and continuous numbering, and then generates a printing image in a format that can be recognized by the nozzle driver board through the encoding function, and finally sends the image to the driver board of the G5 nozzle through Ethernet; the G5 nozzle driver board decomposes the received image data into 2 channels according to the configuration of 4 rows of G5 nozzles and 160 nozzles in each row, and then converts the pixel value into an output level to control the G5 nozzle to complete the printing work; after the analog nozzle driver board receives the signal from the G5 nozzle driver board, it restores the electrical signal into an image of 2 channels; the upper computer APP requests the channel image from the analog nozzle driver board, and then parses the serial number of the verification code, and searches for the serial number in the cache of the serial number that has been printed to determine whether the serial number is repeatedly printed. The more detailed steps and working principles of this embodiment can be, but are not limited to, referring to the relevant records of Example 1.

[0099] An analog nozzle device provided by an embodiment of the present invention realizes a method and system for detecting digital printing described in the present invention, which can realize a large number of simulation tests on the digital printing system without building an actual ink path system, saving the consumption of ink and test materials, and saving the time and labor costs of special personnel loading and unloading materials, and realizing the detection of the accuracy and stability of printing of the digital printing system in a simulated way.

[0100] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A digital printing detection method, characterized in that: The following steps are involved: Collecting digital signals from the first driver board of the digital printhead; Acquire single-column image data based on the first driving board digital signal; Based on the single-column image data and the preset original image parameters, a first verification image is obtained; Verification is performed based on the first verification image and the original image to implement testing of digital printing.

2. A digital printing detection method according to claim 1, characterized in that: The collecting of the digital signal of the first driving board of the digital printhead comprises: Collect the control data electrical signals of the digital printhead; A first driving board digital signal is obtained based on the control data electrical signal.

3. A digital printing detection method according to claim 1, characterized in that: The method of acquiring single-column image data based on the first driving board digital signal comprises: Combining the first driver board digital signal into a plurality of single-byte data according to a preset byte combination rule; Get single-column image data based on several single-byte data.

4. A digital printing detection method according to claim 1, characterized in that: The step of obtaining a first verification image based on the image single column data and preset original image parameters includes: The single-column data of the image is sorted and reorganized based on preset original image parameters to obtain a first verification image.

5. A digital printing detection method according to claim 4, characterized in that: The preset original image parameters include a total column width parameter, a single column byte parameter and a nozzle offset parameter.

6. A digital printing detection method according to claim 1, characterized in that: The verification based on the first verification image and the original image is performed to implement the test of the digital printing, including: Verifying the first verification image by determining the consistency between the first verification image and the original image to obtain a verification result; Based on the verification result, it is determined whether there are printing defects in the digital printing, thereby realizing the test of the digital printing.

7. A digital printing detection method according to any one of claims 1 to 6, characterized in that: The original image includes an original verification code; the verification based on the first verification image and the original image to implement the test of digital printing includes: Parsing the first verification image to obtain a first verification code; Verifying the first verification image by determining the consistency between the first verification code and the original verification code to obtain a verification result; Based on the verification result, it is determined whether there are printing defects in the digital printing, thereby realizing the test of the digital printing.

8. A digital printing detection method according to claim 7, characterized in that: The original verification code is unique and complies with a preset rule; the digital printing detection method also includes: The original verification code is updated according to a preset rule, and the original image is updated to obtain a current image; A second driving board digital signal is generated based on the current image to obtain single-column data of the second image, and then a second verification image is obtained to perform verification based on the second verification image and the current image to implement testing of digital printing.

9. A digital printing detection method according to claim 8, characterized in that: Also includes: If the first verification codes obtained by parsing two consecutive tests are the same, it is determined that the digital printing has a duplicate printing defect; If the first verification codes obtained by parsing two adjacent tests are different and do not conform to a preset rule, it is determined that there is a missing print defect in the digital printing.

10. A digital printing detection system, characterized in that: A digital printing detection method for implementing any one of claims 1 to 9, comprising: An analog signal acquisition module, used for acquiring digital signals from the first driver board of the digital printhead; An image column acquisition module, used for acquiring image single column data based on the digital signal of the first driving board; An image restoration module, used to obtain a first verification image based on a single column of image data and preset original image parameters; The image verification module is used to perform verification based on the first verification image and the original image to implement testing of digital printing.

Images