A digital inkjet printing inspection method and system

Abstract

This invention provides a digital inkjet printing inspection method and system. The method includes: acquiring digital signals from a first driver board of a digital printhead; obtaining single-column image data based on the first driver board digital signals; obtaining a first verification image based on the single-column image data and preset original image parameters; and performing verification based on the first verification image and the original image to achieve testing of the digital inkjet print. This invention provides a digital inkjet printing inspection method and system that, by simulating the traditional method of building an actual ink path system during the pre-shipment testing phase of a digital inkjet printing system, can effectively improve the testing efficiency and inspection quality of the digital inkjet printing system, reduce time, manpower, and material costs, and also enable extensive repeated testing of the digital inkjet printing system for further evaluation and inspection.

Description

Technical Field

[0001] This invention relates to the field of digital inkjet printing inspection technology, and in particular to a digital inkjet printing inspection method and system. Background Technology

[0002] Currently, digital inkjet printing systems require accuracy and stability testing before leaving the factory. After assembling the ink path subsystem, printhead assembly, and host computer app modules, the final testing step is the most complex, testing the inkjet printing effect and stability. The verification of printing effect is currently done manually. This manual verification involves manually placing test materials, printing from the printhead, and manually checking the printing effect. Throughout the verification process, the same actions need to be performed manually dozens or even hundreds of times. When extensive pressure testing is required to verify stability, a rewinding machine is also needed for continuous, high-volume printing tests, consuming a large amount of rewinding material.

[0003] Before a digital inkjet printing system leaves the factory, the testing phase requires setting up an actual ink path system. Dedicated personnel are needed to load and unload materials to test the system's printing accuracy and stability. This traditional verification method consumes a lot of ink and test materials. Furthermore, under the demanding requirements of high-volume, long-term pressure testing, manual loading and unloading alone is insufficient. With increasing product delivery volumes and tighter time constraints, traditional testing methods are no longer adequate for daily needs. Currently, the digital inkjet industry lacks a better solution to this testing problem. Summary of the Invention

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

[0005] To address the aforementioned technical problems, this invention provides a digital inkjet printing inspection method and system, comprising the following steps:

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

[0007] Image single-column data is acquired based on the digital signal from the first driver board;

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

[0009] Verification is performed based on the first verification image and the original image to test the digital inkjet printing.

[0010] In the above scheme, the image single-column data is obtained by acquiring the digital signal of the first driver board of the digital printhead. Based on the image single-column data and according to preset original image parameters, the image is restored to obtain the first verification image. Verification is then performed based on the restored first verification image and the original image, thus realizing the testing of digital inkjet printing. This simulation replaces the traditional method of building an actual ink path system during the pre-shipment testing stage of digital inkjet printing systems, effectively improving testing efficiency and inspection quality, reducing time, manpower, and material costs, and enabling a large number of repeated tests on the digital inkjet printing system for further evaluation and inspection.

[0011] Furthermore, the acquisition of the first driver board digital signal of the digital printhead specifically involves: acquiring the control data electrical signal of the digital printhead; and acquiring the first driver board digital signal based on the control data electrical signal.

[0012] During this process, the electrical signals of the digital printhead are acquired and converted to provide reference data for further processing of the original image.

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

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

[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 based on the first verification image and the original image to test the digital inkjet printing specifically involves: verifying the first verification image by judging the consistency between the first verification image and the original image, and obtaining the verification result; determining whether there is a printing defect in the digital inkjet printing based on the verification result, thereby realizing the test of the digital inkjet printing.

[0017] The above scheme describes a processing procedure for the electrical signals of the digital printhead driver board. It involves acquiring the control data electrical signals of the digital printhead in the digital inkjet printing system and converting them into digital signals, providing reference data for subsequent acquisition of the single-column image data. The digital signals from the first driver board are then combined and processed according to preset rules to form single-column image data. Based on this single-column image data and preset original image parameters, the original image is reconstructed to obtain a first verification image. Verification is then performed based on the first verification image and the original image, thus achieving the testing of the digital inkjet print. This effectively improves the detection efficiency of the digital inkjet printing system.

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

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

[0020] Furthermore, the verification based on the first verification image and the original image to test the digital inkjet printing specifically involves: parsing the first verification image to obtain a first verification code; verifying the first verification image by judging the consistency between the first verification code and the original verification code to obtain a verification result; and determining whether there is a printing defect in the digital inkjet printing based on the verification result, thereby achieving the test of the digital inkjet printing.

[0021] In the appealed scheme, since the original image has a unique original verification code, the consistency between the original image and the first verification image can be verified by judging the consistency between the original verification code and the first verification code, thereby obtaining the verification result and realizing the judgment of the digital printing result. 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 conforms to a preset rule; the digital inkjet printing detection method further includes: updating the original verification code according to the preset rule, and updating the original image to obtain the current image; generating a second driver board digital signal based on the current image to obtain single-column data of the second image, 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 testing of digital inkjet printing.

[0023] Furthermore, the verification based on the second verification image and the current image to test the digital inkjet printing specifically means that if the first verification code obtained from two adjacent tests is the same, then it is determined that the digital inkjet printing has a duplicate printing defect.

[0024] Furthermore, the verification based on the second verification image and the current image to test the digital inkjet printing specifically means that if the first verification code obtained from two adjacent tests is different and does not conform to the preset rule, then it is determined that there is a missing print defect in the digital inkjet printing.

[0025] In the above scheme, since the original verification code is unique and should conform to a preset rule, the original image can be updated and the digital signal of the first driver board of the digital printhead can be re-acquired. Data processing and conversion are then performed to obtain the second verification image, thereby parsing the first verification code of the current image. The consistency of the first verification codes parsed from two adjacent tests is then determined. A normal result for digital printing should be that the determination result is inconsistent and conforms to the preset rule. If the determination result is consistent, it indicates that there is a duplicate printing defect in the digital printing; if the determination result is inconsistent and does not conform to the preset rule, it indicates that there is a missed printing defect in this digital printing.

[0026] This invention also proposes a digital inkjet printing inspection system for implementing the aforementioned digital inkjet printing inspection method. The system includes: an analog signal acquisition module for acquiring digital signals from the first driver board of the digital printhead; an image column acquisition module for acquiring single-column image data based on the first driver board digital signals; an image restoration module for acquiring a first verification image based on the single-column image data and preset original image parameters; and an image verification module for verifying the digital inkjet print based on the first verification image and the original image, thereby achieving the testing of the digital inkjet print.

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

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

[0029] Furthermore, the image restoration module is used to obtain a first verification image based on the single-column image data and preset original image parameters, specifically by sorting and reorganizing the single-column image 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 test the digital inkjet printing, including: 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 between the first verification code and the original verification code and to verify the first verification image to obtain the verification result; and a defect determination submodule, used to determine whether there is a printing defect in the digital inkjet printing based on the verification result, thereby testing the digital inkjet printing.

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

[0032] The above solution is a digital inkjet printing inspection system. Through the function of each module, the analog signal acquisition module acquires the digital signal of the first driver board of the digital printhead, which is then processed by the image column acquisition module and the image restoration module to simulate and obtain the actual digital inkjet printing result, namely 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 inkjet printing based on the verification result. This system is used to implement the digital inkjet printing inspection method.

[0033] The above solution provides a digital inkjet printing inspection method and system. By acquiring, processing, and further analyzing the data electrical signals from the first driver board of the digital printhead, it can test the functionality of the digital inkjet printing system without requiring actual printing operations. Simultaneously, it can perform numerous pressure tests to assess the system's stability. This eliminates the need for physical ink path construction and ink usage, reducing time, manpower, and material costs while being environmentally friendly. Furthermore, it enables extensive pressure testing and evaluation of digital inkjet printing, effectively improving inspection efficiency and quality. Attached Figure Description

[0034] To more clearly illustrate the technical solution of the present invention, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic flowchart of a digital inkjet printing inspection method according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of an image verification process provided in an embodiment of the present invention;

[0037] Figure 3 This is a schematic diagram of the structure of a digital printhead in a digital inkjet printing system according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of an image segment sequence formed based on the single-column data of the image during the detection process of a digital inkjet printing inspection system according to an embodiment of the present invention;

[0039] Figure 5 This is a schematic diagram of the verification process of a digital inkjet printing inspection system, taking QR codes as an example, according to an embodiment of the present invention.

[0040] Figure 6 This is a schematic diagram of a digital inkjet printing inspection system module framework provided in an embodiment of the present invention;

[0041] Figure 7 This is a schematic diagram of a digital inkjet printing inspection system according to an embodiment of the present invention. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] It should be understood that the step numbers used in the text are for ease of description only and are not intended to limit the order in which the steps are performed.

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

[0045] The terms “comprising” and “including” indicate the presence of the described feature, whole, step, operation, element and / or component, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0046] The term “and / or” refers to any combination of one or more of the associated listed items, as well as all possible combinations, and includes these combinations.

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0048] In the testing of digital inkjet printing systems, existing verification methods require manual operation multiple times. This process consumes a large amount of materials, and under the pressure of large-scale, long-term testing, manual labor alone cannot meet the requirements. As the number of products delivered increases and time constraints become more stringent, traditional testing methods can no longer meet daily needs. Therefore, there is an urgent need for a method and system for testing digital inkjet printing systems that can effectively improve testing efficiency and quality. Specifically, this embodiment provides a method for testing digital inkjet printing systems, enabling the testing of the performance and functions of digital inkjet printing systems.

[0049] Example 1:

[0050] Please see Figure 1 and Figure 2 This invention provides a method for detecting a digital inkjet printing system, specifically including the following steps:

[0051] Step S1: Acquire the digital signal of the first driver board of the digital printhead, including 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;

[0052] Step S2: Acquire single-column image data based on the digital signal from the first driver board;

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

[0054] Step S4: Verify based on the first verification image and the original image to test the digital inkjet printing.

[0055] Furthermore, the acquisition of the digital signal from the first driver board of the digital printhead specifically involves: acquiring the control data electrical signal of the digital printhead; and obtaining the digital signal from the first driver board based on the control data electrical signal. In this process, acquiring and converting the electrical signal of the digital printhead provides reference data for further processing of the original image.

[0056] Optionally, the signal acquisition and conversion can be implemented using a high-speed FPGA chip. The high-speed FPGA chip acquires the control data electrical signals of the digital printhead, including high-frequency control signals and nozzle drive data electrical signals, and then converts them into bit-level digital signals through a built-in analog-to-digital converter. Using a high-speed FPGA chip to acquire and convert signals is a reverse processing of the electrical signals from the first driver board of the digital printhead, achieving simulation of the digital printhead, essentially acting as a simulated printhead. In practical applications, for the digital printhead driver board, there is no difference between connecting to a simulated printhead and connecting to a physical digital printhead.

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

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

[0059] Furthermore, the verification based on the first verification image and the original image to test the digital inkjet printing specifically involves: verifying the first verification image by judging the consistency between the first verification image and the original image, and obtaining the verification result; determining whether there is a printing defect in the digital inkjet printing based on the verification result, thereby realizing the test of the digital inkjet printing.

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

[0061] Furthermore, the verification based on the first verification image and the original image to test the digital inkjet printing specifically involves: parsing the first verification image to obtain a first verification code; verifying the first verification image by judging the consistency between the first verification code and the original verification code to obtain a verification result; and determining whether there is a printing defect in the digital inkjet printing based on the verification result, thereby achieving the test of the digital inkjet printing.

[0062] Furthermore, the original verification code is unique and conforms to a preset rule; the digital inkjet printing detection method further includes: updating the original verification code according to the preset rule, and updating the original image to obtain the current image; generating a second driver board digital signal based on the current image to obtain single-column data of the second image, 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 testing of digital inkjet printing.

[0063] Furthermore, the verification based on the second verification image and the current image to test the digital inkjet printing specifically means that if the first verification code obtained from two adjacent tests is the same, then it is determined that the digital inkjet printing has a duplicate printing defect.

[0064] Furthermore, the verification based on the second verification image and the current image to test the digital inkjet printing specifically means that if the first verification code obtained from two adjacent tests is different and does not conform to the preset rule, then it is determined that there is a missing print defect in the digital inkjet printing.

[0065] In the above scheme, since the original verification code is unique and should conform to a preset rule, the original image can be updated and the digital signal of the first driver board of the digital printhead can be re-acquired. Data processing and conversion are then performed to obtain the second verification image, thereby parsing the first verification code of the current image. The consistency of the first verification codes parsed from two adjacent tests is then determined. A normal result for digital printing should be that the determination result is inconsistent and conforms to the preset rule. If the determination result is consistent, it indicates that there is a duplicate printing defect in the digital printing; if the determination result is inconsistent and does not conform to the preset rule, it indicates that there is a missed printing defect in this digital printing.

[0066] Optional, such as Figure 2 The image verification process shown employs error counter accumulation and missing code counter accumulation. Based on the image verification judgment result, the test results of digital inkjet printing are statistically analyzed in real time to achieve the detection of digital inkjet printing system.

[0067] In the above scheme, the image single-column data is obtained by acquiring the digital signal of the first driver board of the digital printhead. 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. Verification is then performed based on the restored first verification image and the original image, thus realizing the testing of digital inkjet printing. Simultaneously, the test results of digital inkjet printing are statistically analyzed in real time. This transforms the traditional method of building an actual ink path system for testing into simulated inkjet printing testing. Utilizing the automatic verification function of the simulated printhead, extensive stress testing of the inkjet printing system can be performed. This solves the technical problem that traditional testing methods can no longer meet daily needs as product delivery volumes increase and time requirements become increasingly tight, achieving faster and more accurate testing of digital inkjet printing systems.

[0068] Example 2:

[0069] Please see Figure 3 , Figure 4 , Figure 5 and Figure 6 This invention provides a digital inkjet printing detection system, comprising: 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, this embodiment of the invention provides a digital inkjet printing detection system that is equivalent to a simulated printhead, consisting of two main parts: an FPGA driver board and a host computer application (APP). 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 application includes a receiving module, an image verification module, a result statistics module, and a display module.

[0071] In its implementation, the analog signal acquisition module includes an electrical signal acquisition submodule and an analog-to-digital conversion submodule, used to interface with the digital inkjet printing system, i.e., the digital printhead driver board. The electrical signal acquisition submodule acquires control signals from the digital printhead and data electrical signals driving the nozzles from the digital printhead driver board via a chip. Then, based on these data electrical signals, it converts them into digital signals through the built-in analog-to-digital conversion submodule. Through signal acquisition and conversion from the digital printhead, the analog effect of the digital printhead is achieved.

[0072] Optionally, the signal acquisition and conversion can be implemented using a high-speed FPGA chip. The high-speed FPGA chip acquires the control data electrical signals of the digital printhead, including high-frequency control signals and nozzle drive data electrical signals, and then converts them into bit-level digital signals through a built-in analog-to-digital converter. Using a high-speed FPGA chip to acquire and convert signals is a reverse processing of the electrical signals from the first driver board of the digital printhead, achieving simulation of the digital printhead, essentially acting as a simulated printhead. In practical applications, for the digital printhead driver board, there is no difference between connecting to a simulated printhead and connecting to a physical digital printhead.

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

[0074] Typically, digital printheads are divided into multiple rows according to the number of color channels, with each row containing several nozzles. After the analog signal acquisition module acquires the digital signals from the printhead driver board that control each nozzle, the data grouping submodule combines the digital signals from the first driver board into several single-byte data according to a preset byte combination rule. The image column acquisition submodule repeats this reading process until all the byte data sent from the printhead driver board to the printhead has been read and the image single-column data has been formed.

[0075] Optional, with Figure 3 Taking the Ricoh G5 printhead as an example, this 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 controlling each nozzle, this module first takes 2 bits of data from each of the four rows to form a single byte of printhead data. This reading process is repeated until all 160 bytes of data sent to the printhead by the printhead driver board are read, forming the single-column image data, which is then stored in the buffer 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 single-column image data and preset original image parameters. The image restoration module reads the single-column image data and, according to the preset original image parameters, namely the total column width of the image, the number of bytes per column, the offset of each row of nozzles, etc., reassembles the scattered single-column image data in a preset manner to restore the first verification image.

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

[0078] Optionally, in the specific implementation process, the image restoration module reads the single-column image data from the cache of the FPGA driver board, and then, based on parameters such as the total column width, number of bytes per column, and offset of each row of nozzles obtained from the host computer APP, reassembles the scattered single-column image data into a complete image according to the order in which it was stored in the cache. The image segment sequence formed by the single-column image data can be shown in Figure 4. Figure 3 Taking the Ricoh G5 digital printhead as an example: if configured with 1 printhead and 2 color channels, the single-column data of the images in rows A and B are assembled into a complete image, corresponding to the grayscale image of the first color; the single-column data of the images in rows C and D form another complete 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; after all frames of an image are received, they are combined into a complete image, thereby completing the printing image restoration of the inkjet 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 sending back 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 inkjet system, that is, the first verification image.

[0081] In its implementation, the image verification module includes a verification code parsing submodule, a comparison verification submodule, and a defect determination submodule. These are used to perform verification based on a first verification image and the original image, thereby testing the digital inkjet printing. The verification code parsing submodule obtains the verification code by parsing the first verification image. 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 its correctness (i.e., consistency comparison).

[0082] Further, 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 and verification submodule verifies the first verification image based on the consistency between the first verification code and the original verification code, and obtains the verification result; the defect determination submodule determines whether there is a printing defect in this digital printing based on the verification result, thereby realizing the testing of the digital printing. If the first verification code parsed by the comparison and verification submodule in two consecutive tests is the same, the defect determination submodule determines that the digital printing has a duplicate printing defect; if the first verification code parsed by the comparison and verification submodule in two consecutive tests is different and does not conform to the preset rule, the digital printing has a missed printing defect; if the first verification code parsed by the comparison and verification submodule in two consecutive tests is different and conforms to the preset rule, the digital printing has no missed printing defect.

[0083] The above solution enables the determination and updating of the printing results of the digital inkjet printing system, which allows for repeated and large-scale testing. This solves the problem that in the actual mass production process of the inkjet printing system, due to stability issues, there may be incomplete printing images, missed printing defects, and repeated printing defects. These problems only occur occasionally in large-scale production, and therefore, it is difficult to detect them by relying on traditional manual testing.

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

[0085] 1. Verification of image defects:

[0086] In actual mass production, inkjet printing systems may experience occasional incomplete printed images due to stability issues. Since this problem only occurs occasionally in large-scale production, it is difficult to address using traditional manual testing. By printing QR codes, the simulated printhead receives the image and performs reverse QR code parsing. If the image is correct, the content can be correctly parsed. By comparing the consistency of the content, it is determined whether the current image has defects, i.e., whether the inkjet printing system has printing defects.

[0087] 2. Verification of whether there is any missing spraying issue in the image:

[0088] In actual mass production, inkjet printing systems can experience stability issues and missed prints when continuously printing under high load. By printing an incremental sequence of QR codes, the simulated printhead receives the image, parses the QR codes, and determines whether there is a missed print defect by comparing the continuity of two adjacent print sequences.

[0089] 3. Verification of whether the image is printed repeatedly:

[0090] In actual mass production, inkjet printing systems can experience stability issues and duplicate printing when continuously printing under high load. By printing an incremental sequence of QR codes, the system simulates the printhead receiving an image and parsing the QR codes. By checking the cache of previously printed records for identical QR codes, the system can determine if a duplicate printing defect exists.

[0091] When the inkjet printing system is determined to have printing defects, missing printing defects, or repeated printing defects, the error counter, missing printing counter, etc., will accumulate the count.

[0092] The result statistics module performs statistics on the judgment results obtained by the image verification module to obtain the image printing defect rate, and transmits the results 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, allowing the testing personnel to intuitively see the entire testing process of the inkjet system.

[0094] The digital inkjet printing detection system provided by this invention specifically includes: using a high-performance FPGA chip to acquire and convert the data electrical signals of the digital printhead, providing reference data for further image processing; using a high-performance FPGA chip to reconstruct a first verification image using a reverse method based on the function of each pin signal of the printhead and parameters such as the printhead ink dot bit width, the number of nozzle rows, and the number of nozzles per row; utilizing the reverse parsing principle of QR codes, the content of the original image can be directly parsed without the aid of other reference data, and this can be used to determine whether the inkjet printing system has printing defect images; using the reverse parsing content of the QR codes to determine whether the inkjet printing system has missing inkjet defects; and using the reverse parsing content of the QR codes to determine whether the inkjet printing system has duplicate inkjet defects. This provides a more efficient testing method for verifying the accuracy and stability of digital inkjet printing systems.

[0095] Example 3:

[0096] Please see Figure 7 This invention provides a simulated printhead device for detecting digital inkjet printing systems, comprising any one of the above-described methods and systems for detecting digital inkjet printing.

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

[0098] The following example, using the analog printhead detection of duplicate code rate in a digital inkjet printing system, illustrates the data processing flow of the analog printhead: The control system of the digital inkjet printing system automatically generates a fixed-length string with consecutive numbers. Then, through encoding, it generates a print image in a format recognizable by the printhead driver board. Finally, the image is sent to the G5 printhead driver board via Ethernet. The G5 printhead driver board, based on the configuration of 4 rows and 160 nozzles per row, decomposes the received image data into two channels and converts the pixel values ​​into output levels to control the G5 printhead to complete the printing process. After receiving the signal from the G5 printhead driver board, the analog printhead driver board restores the electrical signal to the two-channel image. The host computer APP requests the channel image from the analog printhead driver board, then parses the serial number of the verification code and searches for the serial number in the already printed serial number cache to determine if the serial number is duplicated. For more detailed steps and working principles of this embodiment, please refer to the relevant description in Embodiment 1, but not limited to these examples.

[0099] The simulated printhead device provided by this invention realizes the digital inkjet printing testing method and system described in this invention. It can perform a large number of simulated tests on the digital inkjet 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 dedicated personnel for loading and unloading materials. It realizes the testing of the accuracy and stability of the digital inkjet printing system in a simulated manner.

[0100] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A digital inkjet printing inspection method, characterized in that, Includes the following steps: Collect digital signals from the first driver board of the digital printhead; The image single-column data is acquired based on the digital signal of the first driver board. Specifically, the digital signal of the first driver board is combined into several single-byte data according to a preset byte combination rule; and the image single-column data is acquired based on the several single-byte data. Based on single-column image data and preset original image parameters, a first verification image is obtained. Specifically, the single-column image data is sorted and reorganized based on preset original image parameters to obtain the first verification image. Wherein, the preset original image parameters include total column width parameters, single-column byte parameters, and nozzle offset parameters. Verification is performed based on the first verification image and the original image to test the digital inkjet printing. Specifically, the first verification image is verified by judging the consistency between the first verification image and the original image to obtain the verification result; based on the verification result, it is determined whether there is a printing defect in the digital inkjet printing, thus realizing the test of digital inkjet printing.

2. The digital inkjet printing inspection method according to claim 1, characterized in that, The digital signal from the first driver board of the digital printhead is acquired, including: Collect control data electrical signals from the digital printhead; The digital signal of the first driver board is obtained based on the control data electrical signal.

3. A digital inkjet printing inspection method according to any one of claims 1 to 2, characterized in that, The original image includes the original verification code; the verification based on the first verification image and the original image to test the digital inkjet printing includes: Parse the first verification image to obtain the first verification code; The first verification image is verified by judging the consistency between the first verification code and the original verification code, and the verification result is obtained. Based on the verification results, it is determined whether there are printing defects in the digital inkjet printing, thus realizing the testing of digital inkjet printing.

4. The digital inkjet printing inspection method according to claim 3, characterized in that, The original verification code is unique and conforms to a preset pattern; the digital inkjet printing detection method further includes: The original verification code is updated according to a preset rule, and the original image is also updated to obtain the current image; The second driver board digital signal is generated based on the current image to obtain the second image single column data, and then the second verification image is obtained. The verification is performed based on the second verification image and the current image to realize the test of digital inkjet printing.

5. The digital inkjet printing inspection method according to claim 4, characterized in that, Also includes: If the first verification code obtained from two consecutive tests is the same, it is determined that there is a duplicate printing defect in digital inkjet printing. If the first verification code obtained from two consecutive tests is different and does not conform to the preset pattern, it is determined that there is a missing print defect in digital inkjet printing.

6. A digital inkjet printing inspection system, characterized in that, A digital inkjet printing inspection method as described in any one of claims 1 to 5, comprising: The analog signal acquisition module is used to acquire the digital signal from the first driver board of the digital printhead. The image column acquisition module is used to acquire single-column image data based on the digital signal from the first driver board. The image restoration module is used to obtain the first verification image based on a single column of image data and preset original image parameters; The image verification module is used to verify the digital inkjet print based on the first verification image and the original image.

Images