Spray head chromatography detection image printing method, calibration value obtaining method, device and equipment

Abstract

The invention discloses a nozzle chromatography detection image printing method, a calibration value obtaining method, a calibration value obtaining device and equipment, and relates to the technical field of ink-jet printing. According to the method, the first detection image and the second detection image are obtained and printed to obtain the third detection image used for nozzle chromatography calibration, and the nozzle chromatography offset information can be rapidly, simply and accurately obtained by using the position of the calibration part in the third detection image. Even if abnormal conditions such as unstable printing speed and paper feeding speed, printing medium deformation, unstable grating or coded disc signals and the like occur, the color register calibration value can be accurately obtained, and technical personnel can be assisted in judging whether the abnormal conditions occur in the printing equipment or not, so that equipment calibration or correction is carried out in time, and the printing efficiency is improved. And image printing quality is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of inkjet printing, and in particular to a method for printing a nozzle color registration detection chart, a method and device for obtaining a calibration value, and equipment. Background Art

[0002] Before printing an image, it is necessary to perform color calibration of each color channel in the nozzle or between nozzles to achieve good image printing quality. In the prior art, color calibration of the nozzle is often performed by printing a color image on the printing medium. Figure 1 The color calibration test diagram shown in the figure is to print two lines, the reference column and the calibration column, at the same position, observe the deviation position of the two lines to obtain the color calibration value, and then perform color calibration based on the obtained color calibration value. However, in actual printing applications, there may be problems such as uneven printing media or stretching and deformation, unstable printing speed or paper feed speed, fluctuating paper feed direction, unstable grating or encoder signal, etc. In these cases, if according to the following Figure 1 The color calibration value obtained from the color calibration test chart shown will be biased or erroneous, resulting in problems such as unstable color calibration value and inaccurate calibration, which ultimately affects the image printing quality. Summary of the invention

[0003] In view of this, the embodiments of the present invention provide a method for printing a printhead color detection chart, a method and device for obtaining a calibration value, and equipment to solve the problem of inaccurate color calibration value acquisition in the prior art.

[0004] In a first aspect, an embodiment of the present invention provides a method for printing a nozzle color detection chart, the method comprising:

[0005] Acquire a first detection image and a second detection image, wherein the first detection image includes N first detection parts arranged along a first direction, each of the first detection parts includes a plurality of first detection lines arranged along the first direction and arranged in parallel along a second direction, each of the first detection lines is spaced apart by a preset pixel and the projections in the second direction overlap, and the first first detection lines in two adjacent first detection parts differ by one pixel in the second direction; the second detection image includes N second detection parts arranged in parallel along the first direction, each of the second detection parts includes a plurality of second detection lines arranged along the first direction and arranged in parallel along the second direction, the length and width of the second detection line are the same as those of the first detection line, each of the second detection lines is spaced apart by the preset pixel and the projections in the second direction overlap, and the first second detection lines in the N second detection parts are located on the same straight line in the second direction; wherein the second direction is in the same direction as the printing direction, the first direction is perpendicular to the second direction, and N is a natural number greater than or equal to 2;

[0006] The first detection image and the second detection image are printed on a printing medium to obtain a third detection image for performing a nozzle color calibration.

[0007] Preferably, a distance between two adjacent first detection parts in the first direction is zero, and a distance between two adjacent second detection parts in the first direction is zero.

[0008] Preferably, N is an odd number greater than or equal to 3.

[0009] Preferably, the sum of widths and intervals of all the first detection lines in the first detection section is equal to the sum of widths and intervals of all the second detection lines in the second detection section.

[0010] Preferably, the width of the first detection line and the second detection line are both (N-1) / 2 pixels, the first detection lines are spaced (N-1) / 2 pixels apart, and the second detection lines are spaced (N-1) / 2 pixels apart.

[0011] Preferably, a calibration parameter is marked on either side or both sides of each of the first detection parts, wherein the calibration parameter corresponding to the mark of the first detection part located in the middle position is "0".

[0012] Preferably, the step of printing the first test image and the second test image on a print medium to obtain a third test image for performing print head color calibration comprises:

[0013] Control the first channel in the nozzle group to print the first test image to a preset printing position on the printing medium to obtain a first printed test image;

[0014] Control the second channel in the nozzle group to print the second inspection drawing to the preset printing position on the printing medium to obtain a second printed inspection drawing;

[0015] Obtain the third test image according to the first printed test image and the second printed test image;

[0016] The nozzle group includes at least one nozzle. When the nozzle group includes only one nozzle, the nozzle includes at least two channels. When the nozzle group includes more than two nozzles, each nozzle includes at least one column of channels. The first channel and the second channel are channels in the same nozzle or channels in different nozzles.

[0017] In a second aspect, an embodiment of the present invention provides a method for obtaining a printhead color calibration value, the method comprising:

[0018] Obtaining a third detection image as described in any one of the first aspect, wherein the third detection image includes N third detection parts corresponding to the N first detection parts in the first detection image and N fourth detection parts corresponding to the N second detection parts in the second detection image, wherein each of the third detection parts includes a plurality of third detection lines arranged in parallel along the second direction, each of the fourth detection parts includes a plurality of fourth detection lines arranged in parallel along the second direction, and the third detection lines in one of the third detection parts and the fourth detection lines in one of the fourth detection parts are completely alternated or completely overlapped to obtain a calibration part;

[0019] The nozzle color calibration value is determined according to the position of the calibration part.

[0020] Preferably, the method further comprises:

[0021] Whether one or more of the following occurs during the printing process: unstable printing speed, unstable paper feeding speed, deformation of the printing medium, unstable grating signal, or unstable code disk signal, is determined according to the position change of the calibration portion.

[0022] In a third aspect, an embodiment of the present invention provides a device for printing a nozzle color detection chart, the device comprising:

[0023] A detection image acquisition module, used for acquiring a first detection image and a second detection image, wherein the first detection image includes N first detection parts arranged along a first direction, each of the first detection parts includes a plurality of first detection lines arranged along the first direction and arranged in parallel along a second direction, each of the first detection lines is spaced apart by a preset pixel and the projections in the second direction overlap, and the first first detection lines in two adjacent first detection parts differ by one pixel in the second direction; the second detection image includes N second detection parts arranged in parallel along the first direction, each of the second detection parts includes a plurality of second detection lines arranged along the first direction and arranged in parallel along the second direction, the length and width of the second detection lines are the same as those of the first detection lines, each of the second detection lines is spaced apart by the preset pixel and the projections in the second direction overlap, and the first second detection lines in the N second detection parts are located on the same straight line in the second direction; wherein the second direction is in the same direction as the printing direction, the first direction is perpendicular to the second direction, and N is a natural number greater than or equal to 2;

[0024] The printing module is used to print the first detection image and the second detection image on a printing medium to obtain a third detection image used for nozzle color calibration.

[0025] In a fourth aspect, an embodiment of the present invention provides a device for obtaining a printhead color calibration value, the device comprising:

[0026] A calibration unit acquisition module, used to acquire a third detection image as described in any one of the first aspects, wherein the third detection image includes N third detection parts corresponding to the N first detection parts in the first detection image and N fourth detection parts corresponding to the N second detection parts in the second detection image, wherein each of the third detection parts includes a plurality of third detection lines arranged in parallel along the second direction, each of the fourth detection parts includes a plurality of fourth detection lines arranged in parallel along the second direction, and the third detection lines in one of the third detection parts and the fourth detection lines in one of the fourth detection parts are completely alternated or completely overlapped to obtain a calibration unit;

[0027] The calibration value determination module is used to determine the printhead color calibration value according to the position of the calibration part.

[0028] In a fifth aspect, an embodiment of the present invention provides an inkjet printing device, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, and when the computer program instructions are executed by the processor, the method of the first aspect in the above embodiment is implemented.

[0029] In a sixth aspect, an embodiment of the present invention provides a storage medium having computer program instructions stored thereon, which, when executed by a processor, implements the method of the first aspect in the above-mentioned embodiment.

[0030] In summary, the beneficial effects of the present invention are as follows:

[0031] The embodiments of the present invention provide a method for printing a nozzle color detection image, a method and device for obtaining a calibration value, and a device. By obtaining and printing a first detection image and a second detection image, a third detection image for performing nozzle color calibration is obtained. The position of the calibration portion in the third detection image can be used to quickly, simply, and accurately obtain the nozzle color offset information. Even if abnormal conditions such as unstable printing speed and paper feed speed, deformation of the printing medium, unstable grating or code disk signals occur, the color calibration value can be accurately obtained. In addition, the technical staff can be assisted in determining whether the printing device has the above-mentioned abnormal conditions, so that the equipment can be calibrated or corrected in time to ensure the image printing quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings required for use in the embodiment of the present invention will be briefly introduced below. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work, and these are all within the protection scope of the present invention.

[0033] Figure 1 It is a schematic diagram of a color calibration detection diagram in the background technology.

[0034] Figure 2 It is a schematic flow chart of a method for printing a nozzle color detection chart according to an embodiment of the present invention.

[0035] Figure 3 is a schematic diagram of a first detection image according to an embodiment of the present invention.

[0036] Figure 4 4 is a schematic diagram of a second detection image according to an embodiment of the present invention.

[0037] Figure 5 is a schematic diagram of a first detection image according to an embodiment of the present invention.

[0038] Figure 6 4 is a schematic diagram of a third detection image according to an embodiment of the present invention.

[0039] Figure 7 4 is a schematic diagram of a third detection image according to an embodiment of the present invention.

[0040] Figure 8 It is a flowchart of a method for obtaining a printhead color calibration value according to an embodiment of the present invention.

[0041] Fig. 9 is a schematic diagram of a calibration unit according to an embodiment of the present invention.

[0042] Fig.10 is a schematic diagram of a calibration unit according to an embodiment of the present invention.

[0043] Fig.11 It is a schematic diagram of the third test image actually printed according to the embodiment of the present invention.

[0044] Fig.12 It is a detection image obtained by overlapping the first detection image and the second detection image in the embodiment of the present invention.

[0045] Fig.13 It is a schematic diagram of the third test image actually printed according to the embodiment of the present invention.

[0046] Fig.14 It is a schematic structural diagram of a nozzle color registration detection diagram printing device according to an embodiment of the present invention.

[0047] Fig.15 It is a structural schematic diagram of a device for obtaining a printhead color calibration value according to an embodiment of the present invention.

[0048] Fig.16 It is a schematic structural diagram of an inkjet printing device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and Examples. It should be understood that the specific embodiments described herein are only configured to explain the present invention and are not configured to limit the present invention. For those skilled in the art, the present invention can be implemented without the need for some of these specific details. The following description of the embodiments is only to provide a better understanding of the present invention by illustrating examples of the present invention.

[0050] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0051] Embodiment 1

[0052] The embodiment of the present invention provides a method for printing a nozzle color detection chart, which is applied to an inkjet printer, wherein the inkjet printer includes a reciprocating scanning printer, a Onepass inkjet printer, and a Singlepass inkjet printer, wherein the inkjet printer includes at least one nozzle group, wherein the nozzle group includes at least one nozzle, and wherein the nozzle includes at least one ink outlet channel (hereinafter referred to as the channel), and the channel may be any one of a cyan channel, a magenta channel, a yellow channel, and a black channel, or two or more. Preferably, in order to realize color image printing, the nozzle of the inkjet printer often includes four color channels of CMYK. Before printing an image, color calibration between the channels is required to achieve good image printing quality.

[0053] See also Figure 2 The embodiment of the present invention provides a method for printing a nozzle color detection chart, the method comprising the following steps:

[0054] S1: Obtain a first detection image and a second detection image, wherein the first detection image includes N first detection parts arranged along a first direction, each of the first detection parts includes a plurality of first detection lines arranged along the first direction and arranged in parallel along a second direction, each of the first detection lines is spaced apart by a preset pixel and the projections in the second direction overlap, and the first first detection lines in two adjacent first detection parts differ by one pixel in the second direction; the second detection image includes N second detection parts arranged in parallel along the first direction, each of the second detection parts includes a plurality of second detection lines arranged along the first direction and arranged in parallel along the second direction, the length and width of the second detection line are the same as those of the first detection line, each of the second detection lines is spaced apart by the preset pixel and the projections in the second direction overlap, and the first second detection lines in the N second detection parts are located on the same straight line in the second direction; wherein the second direction is in the same direction as the printing direction, the first direction is perpendicular to the second direction, and N is a natural number greater than or equal to 2;

[0055] S2: Printing the first test image and the second test image on a printing medium to obtain a third test image for performing print head color calibration.

[0056] Specifically, Figure 3 As shown, the first detection diagram includes N first detection parts 10 arranged along the first direction Y, where N is a natural number greater than or equal to 2. Each of the first detection parts 10 includes a plurality of first detection lines 11 arranged along the first direction X (the line segment extending direction is the first direction X) and arranged in parallel along the second direction Y. The first detection lines 11 are spaced apart from each other by a number of pixels and their projections in the second direction X overlap. Preferably, the width of the first detection line 11 in the second direction X is the same as the spacing between the two first detection lines 11. The length of the first detection line 11 in the first direction Y can be determined according to actual conditions and is not limited here. Wherein, the first direction is perpendicular to the second direction, and the second direction is in the same direction as the printing direction.

[0057] In order to detect the color shift between the nozzle channels, the starting positions of two adjacent first detection parts 10 in the second direction X are staggered by one pixel, and in each first detection part 10, the first detection lines 11 corresponding to the same position number are staggered by one pixel. Figure 3As shown, for the convenience of description, the N first detection units arranged along the first direction Y are called the first first detection unit 10, the second first detection unit 10, the third first detection unit 10, ... the Nth first detection unit 10 in the order of arrangement from top to bottom. Among them, the first first detection line 111 of the first first detection unit 10 and the first first detection line 112 of the second first detection unit 10 differ by one pixel in the second direction X, and the first first detection line 113 of the third first detection unit 10 and the first first detection line 112 of the second first detection unit 10 differ by one pixel in the second direction X (two pixels from the first first detection line 111 of the first first detection unit 10), the first first detection line 114 of the fourth first detection unit 10 and the first first detection line 113 of the third first detection unit 10 differ by one pixel in the second direction X..., and the first first detection line of the Nth first detection unit differs by one pixel from the first first detection line of the N-1th first detection unit.

[0058] like Figure 4 As shown, the second detection image also includes N second detection images 20 arranged in parallel along the first direction, and each second detection part 20 includes multiple second detection lines 21 set along the first direction Y and arranged in parallel along the second direction X. The length and width of the second detection line 21 are the same as the length and width of the first detection line 11. The second detection lines 21 are spaced apart from each other by a number of pixels and their projections in the second direction X overlap. Preferably, the number of pixels spaced apart between the second detection lines 21 is the same as that of the first detection lines 11. Unlike the first detection image, in the second detection image, the starting position of each second detection part 20 in the second direction is the same, so the second detection lines 21 with the same position number in each second detection part 20 form a straight line in the second direction. Exemplarily, as Figure 4 As shown, the first second detection line 211 of the first second detection unit 20 and the first second detection line 212 of the second second detection unit 20 are at the same position in the second direction X, and the first second detection line 213 of the third second detection unit 20 and the first second detection line 212 of the second second detection unit 20 and the first second detection line 211 of the first second detection unit 20 are at the same position in the second direction X…, the first second detection lines of the Nth second detection units are all at the same position in the second direction X, that is, they are on the same straight line along the second direction X.

[0059] In one embodiment, the spacing between the N first detection units 10 in the first direction Y is zero, and the spacing between the N second detection units 20 in the first direction Y is also zero, that is, the spacing between any two adjacent first detection units 10 in the first direction Y is zero, and the spacing between any two adjacent second detection units 20 in the first direction Y is zero. In other embodiments, the spacing between each first detection unit 10 in the first direction Y is a number of pixels, and similarly, the spacing between each second detection unit 20 in the first direction Y is also the same number of pixels, that is, the spacing between two adjacent first detection units 10 and the spacing between two adjacent second detection units 20 are the same.

[0060] In one embodiment, the width and interval of the first detection line and the second detection line can be determined according to the actual printing situation, but the sum of the width and interval of all first detection lines in the first detection part must be equal to the sum of the width and interval of all second detection lines in the second detection part.

[0061] In one embodiment, N is an odd number greater than or equal to 3. Figure 3 and Figure 4 As shown, N = 5. When N is an odd number greater than or equal to 3, the number of the first detection units 10 in the first detection diagram and the number of the second detection units 20 in the second detection diagram are both odd numbers.

[0062] In one embodiment, the width of the first detection line 11 and the second detection line 21 are both (N-1) / 2 pixels, and the interval between each of the first detection lines 11 is (N-1) / 2 pixels, and the interval between each of the second detection lines 21 is (N-1) / 2 pixels. The first detection lines 11 in the first detection image and the second detection lines 21 in the second detection image have the same width and the same interval of (N-1) / 2, so that when the first detection image and the second detection image are printed at the same printing position, the color offset is determined according to whether the printed detection lines overlap, partially overlap, or do not overlap (alternate).

[0063] In one embodiment, a calibration parameter is marked on either or both sides of each first detection portion, wherein the calibration parameter corresponding to the first detection portion located in the middle is "0", or a calibration parameter is marked on either or both sides of each second detection portion, wherein the calibration parameter corresponding to the first detection portion located in the middle is "0". Figure 5As shown, in the first detection image, the calibration parameter value is marked on the right side of each first detection part. The calibration parameter value marked on the right side of the first detection part 10 in the middle position is "0", and the other first detection parts 10 above it are marked as "1" and "2" respectively, and the other first detection parts 10 below it are marked as "-1" and "-2" respectively. After printing out the first detection image and the second detection image, the color calibration value can be directly obtained according to the printing situation and the marked calibration parameters.

[0064] In one embodiment, the first detection image and the second detection image are printed on a printing medium to obtain a third detection image for performing a nozzle color calibration:

[0065] Control the first channel in the nozzle group to print the first test image to a preset printing position on the printing medium to obtain a first printed test image;

[0066] Control the second channel in the nozzle group to print the second inspection drawing to the preset printing position on the printing medium to obtain a second printed inspection drawing;

[0067] Obtain the third test image according to the first printed test image and the second printed test image;

[0068] The nozzle group includes at least one nozzle. When the nozzle group includes only one nozzle, the nozzle includes at least two channels. When the nozzle group includes more than two nozzles, each nozzle includes at least one column of channels. The first channel and the second channel are channels in the same nozzle or channels in different nozzles.

[0069] Specifically, the nozzle color shift detection can detect the color shift between channels in the same nozzle, or the color shift between channels between different nozzles. Exemplarily, if the nozzle group only includes nozzle 1, and nozzle 1 includes four color channels of CMYK, the color shift between any two channels of the four CMYK channels can be detected. When it is necessary to detect the color shift between the C channel and the M channel, in one scan, the C channel of nozzle 1 is controlled to print the first detection image at a preset printing position specified in the printing medium to obtain a first printed detection image; in addition, the M channel of nozzle 1 is controlled to print the second detection image at the same preset printing position to obtain a second printed detection image. Correspondingly, the first printed detection image includes a third detection portion corresponding to the N first detection portions 10 in the first detection image, and the second printed detection image includes a fourth detection portion corresponding to the N second detection portions in the second detection image. Since the first printed detection image and the second printed detection image are printed at the same printing position, the two images are superimposed to form the following. Figure 6 or Figure 7 The third detection picture shown.

[0070] In another example, if the nozzle group includes at least nozzle 2 and nozzle 3, and nozzle 2 and nozzle 3 include four color channels of CMYK respectively, when it is necessary to detect the color offset between the C channel of nozzle 2 and the C channel of nozzle 3, in one scan, the C channel of nozzle 2 is controlled to print the first detection image at the preset printing position specified in the printing medium, so as to obtain the first printed detection image; in addition, the C channel of nozzle 3 is controlled to print the second detection image at the same preset printing position, so as to obtain the second printed detection image. The first printed detection image and the second printed detection image are superimposed to form the following. Figure 6 or Figure 7 The third detection picture shown.

[0071] After the third detection image is obtained, the color offset is determined according to the overlap between the third detection parts and the fourth detection parts in the third detection image, and the color calibration value between the channels for printing the first detection image and the second detection image is obtained. For specific methods, please refer to Example 2.

[0072] Embodiment 2

[0073] Based on the above-mentioned embodiment 1, embodiment 2 of the present invention provides a method for obtaining the color calibration value of the nozzle, see Figure 8 , the method comprising:

[0074] S3: Obtaining a third detection image as described in Example 1, wherein the third detection image includes N third detection parts corresponding to the N first detection parts in the first detection image and N fourth detection parts corresponding to the N second detection parts in the second detection image, wherein each of the third detection parts includes a plurality of third detection lines arranged in parallel along the second direction, each of the fourth detection parts includes a plurality of fourth detection lines arranged in parallel along the second direction, and the third detection lines in one of the third detection parts and the fourth detection lines in one of the fourth detection parts are completely alternated or completely overlapped to obtain a calibration part;

[0075] S4: Determine the nozzle color calibration value according to the position of the calibration part.

[0076] For details, see Fig. 9 When the first channel and the second channel are accurately color-coded without offset, the position of the calibration unit 50 will appear in the middle of the third detection image, that is, the detection lines in the third detection unit in the middle of the first print detection image and the fourth detection unit in the middle of the second print detection image are staggered to form a color block image (because the third detection line and the fourth detection line have the same width and length, and the interval between each third detection line and each fourth detection line is the same as the width of the third detection line or the fourth detection line). When the calibration unit appears above or below the middle position, it means that there is color offset between the first channel and the second channel. Fig.10As shown, the calibration portion 50 appears at the second third detection portion (or the second fourth detection portion) from the top, indicating that the color calibration value between the two channels is 1 pixel. When the printing task is officially performed, the color of the first channel and the second channel in the nozzle needs to be calibrated according to the color calibration value to ensure good printing quality.

[0077] It is worth pointing out that, in addition to obtaining the nozzle color offset, the method described in Example 1 and Example 2 can be implemented in the printing detection, and the position change of the calibration unit in the third detection image can also be used to assist in judging whether the printing speed and paper feed speed are unstable, whether the printing medium is stretched or deformed, and whether the grating or code disk has unstable signals during the printing process. Because even if the nozzle color is calibrated before printing, if the printing speed and paper feed speed are unstable, the printing medium is deformed and stretched, or the grating or code disk signal is unstable during the printing process, it will also cause deviations in the printing positions of each channel of the nozzle, resulting in inaccurate color registration.

[0078] like Fig.11 As shown, the position of the calibration part in the third detection figure is sometimes in the middle and above position, and sometimes in the middle and below position. If only the nozzle color is offset, the position of the calibration part is relatively fixed above or below the middle position. If the position of the calibration part is sometimes in the middle position and sometimes in the middle and above position, it can be judged that one or more situations such as unstable printing speed and paper feed speed, or deformation of the printing medium or unstable grating code disk signal have occurred. Which one or more reasons are caused needs to be analyzed according to the actual situation. In one embodiment, the change rule of the calibration part position can be summarized by reading and repeating the test experiments for many times, and it can be judged that the printing speed and paper feed speed are unstable, the printing cut-off deformation is suspected to be the unstable grating and code disk signal according to the position change rule.

[0079] It is worth pointing out that, compared with the color registration detection chart in the background technology, the first detection chart and the second detection chart provided by the embodiment of the present invention and the third detection chart obtained after printing can also be used to determine whether color registration offset or color registration calibration value occurs according to the position of the calibration unit, even if the printing speed and paper feeding speed are unstable, the printing cutoff deformation is suspected to be caused by the grating and the code disk signal being unstable. Fig.11 In the third detection figure shown, except for a small part on the left side that is located above the middle position, most of the calibration part is located below the middle position. It can be determined that the printing medium is deformed in the left area, and the color calibration value is determined to be "-1" based on the position of most of the calibration part.

[0080] In one embodiment, Fig.12The following is a test image of the first test image and the second test image (after overlapping) set for the OnePass printer. In this test image, the test lines of the first test section and the second test section in the middle of the first test image and the second test image are completely overlapped, so the spacing between the test lines of the test section in the middle position appears to be the largest and the brightness is the highest. When there is no color shift between the channels of the first test image and the second test image, the third test image should be the same as the Fig.12 That is, the detection lines of the third detection unit and the fourth detection unit in the middle position should be completely overlapped (completely misaligned in Example 1), and the area after the third detection unit and the fourth detection unit completely overlap is also recorded as the calibration unit. When there is no color offset between the two channels, the calibration unit should appear in the middle of each third detection unit. When there is color offset, it will be fixed above or below the middle position. If the printing speed or paper feed speed is unstable, the printing medium is deformed, or the encoder signal is unstable, it will be as follows Fig.13 As shown, the position of the calibration part fluctuates up and down and is not fixed.

[0081] Therefore, the third test image obtained after printing the first test image and the second test image can not only accurately obtain the color calibration value, but also assist in judging whether the printing speed, paper feed speed is unstable, the printing medium is deformed, or the code disk signal is unstable. Compared with the test image in the prior art, the color calibration value can be obtained more stably and accurately.

[0082] To summarize, the method for printing a nozzle color detection image and the method for obtaining a nozzle color calibration value provided in the embodiments of the present invention obtain and print a first detection image and a second detection image to obtain a third detection image for performing nozzle color calibration. The position of the calibration portion in the third detection image can be used to quickly, simply and accurately obtain the nozzle color calibration value. Even if abnormal conditions such as unstable printing speed and paper feed speed, deformation of the printing medium, unstable grating or code disk signals occur, the color calibration value can be accurately obtained, and the technical staff can also be assisted in determining whether the printing device has the above-mentioned abnormal conditions, so that the device can be calibrated or corrected in time to ensure image printing quality.

[0083] Embodiment 3

[0084] See also Fig.14 The embodiment of the present invention provides a nozzle color detection chart printing device 200, the device comprising:

[0085] The detection image acquisition module 201 is used to acquire a first detection image and a second detection image, wherein the first detection image includes N first detection parts arranged along a first direction, each of the first detection parts includes a plurality of first detection lines arranged along the first direction and arranged in parallel along a second direction, each of the first detection lines is spaced apart by a preset pixel and the projections in the second direction overlap, and the first first detection lines in two adjacent first detection parts differ by one pixel in the second direction; the second detection image includes N second detection parts arranged in parallel along the first direction, each of the second detection parts includes a plurality of second detection lines arranged along the first direction and arranged in parallel along the second direction, the length and width of the second detection lines are the same as those of the first detection lines, each of the second detection lines is spaced apart by the preset pixel and the projections in the second direction overlap, and the first second detection lines in the N second detection parts are located on the same straight line in the second direction; wherein the second direction is in the same direction as the printing direction, the first direction is perpendicular to the second direction, and N is a natural number greater than or equal to 2;

[0086] The printing module 202 is used to print the first detection image and the second detection image on a printing medium to obtain a third detection image for performing a nozzle color calibration.

[0087] Embodiment 4

[0088] See also Fig.15 The embodiment of the present invention provides a device 400 for obtaining a printhead color calibration value, and the device 400 includes:

[0089] The calibration unit acquisition module 401 is used to acquire the third detection image as described in the first embodiment, wherein the third detection image includes N third detection units corresponding to the N first detection units in the first detection image and N fourth detection units corresponding to the N second detection units in the second detection image, wherein each of the third detection units includes a plurality of third detection lines arranged in parallel along the second direction, each of the fourth detection units includes a plurality of fourth detection lines arranged in parallel along the second direction, and the third detection lines in one of the third detection units and the fourth detection lines in one of the fourth detection units are completely alternated or completely overlapped to obtain a calibration unit;

[0090] The calibration value determination module 402 is used to determine the printhead color calibration value according to the position of the calibration part.

[0091] To summarize, the device for acquiring the nozzle color calibration value provided in the embodiment of the present invention obtains and prints the first detection image and the second detection image to obtain the third detection image for performing the nozzle color calibration. The position of the calibration part in the third detection image can be used to quickly, simply and accurately obtain the nozzle color offset information. Even if there are abnormal conditions such as unstable printing speed and paper feeding speed, deformation of the printing medium, unstable grating or code disk signal, the color calibration value can be accurately obtained, and the technical personnel can also be assisted to determine whether the printing equipment has the above-mentioned abnormal conditions, so as to timely calibrate or correct the equipment to ensure the image printing quality.

[0092] Embodiment 5

[0093] In addition, the nozzle color registration detection chart printing method of the embodiment of the present invention can be implemented by a nozzle color registration detection chart printing device. Fig.16 A schematic diagram of the hardware structure of a nozzle color registration detection diagram printing device provided in an embodiment of the present invention is shown.

[0094] The nozzle color registration detection chart printing device may include a processor 301 and a memory 302 storing computer program instructions.

[0095] Specifically, the processor 301 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or may be configured to implement one or more integrated circuits of the embodiment of the present invention.

[0096] The memory 302 may include a large capacity memory for data or instructions. For example, but not limitation, the memory 302 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a universal serial bus (USB) drive or a combination of two or more of these. In appropriate cases, the memory 302 may include a removable or non-removable (or fixed) medium. In appropriate cases, the memory 302 may be inside or outside the data processing device. In a specific embodiment, the memory 302 is a non-volatile solid-state memory. In a specific embodiment, the memory 302 includes a read-only memory (ROM). In appropriate cases, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM) or a flash memory or a combination of two or more of these.

[0097] The processor 301 reads and executes the computer program instructions stored in the memory 302 to implement any one of the nozzle color registration detection chart printing methods in the above embodiments.

[0098] In one example, the nozzle color detection chart printing device may further include a communication interface 303 and a bus 310. Fig.16 As shown, the processor 301, the memory 302, and the communication interface 303 are connected via a bus 310 and communicate with each other.

[0099] The communication interface 303 is mainly used to implement the communication between the modules, devices, units and / or equipment in the embodiment of the present invention.

[0100] Bus 310 includes hardware, software or both, and the parts of the nozzle color detection diagram printing device are coupled to each other.For example, but not limitation, bus 310 may include accelerated graphics port (AGP) or other graphics buses, enhanced industrial standard architecture (EISA) bus, front-end bus (FSB), hypertransmission (HT) interconnection, industrial standard architecture (ISA) bus, infinite bandwidth interconnection, low pin count (LPC) bus, memory bus, micro channel architecture (MCA) bus, peripheral component interconnection (PCI) bus, PCI-Express (PCI-X) bus, serial advanced technology attachment (SATA) bus, video electronics standard association local (VLB) bus or other suitable bus or two or more of these combinations. In suitable cases, bus 310 may include one or more buses. Although the embodiment of the present invention describes and shows a specific bus, the present invention considers any suitable bus or interconnection.

[0101] Embodiment 4

[0102] In addition, in combination with the print head color detection image printing method in the above embodiment, the embodiment of the present invention can provide a computer-readable storage medium for implementation. The computer-readable storage medium stores computer program instructions; when the computer program instructions are executed by the processor 301, any one of the print head color detection image printing methods in the above embodiment is implemented.

[0103] To summarize, the method for printing a nozzle color detection image, the method and device for obtaining a calibration value, and the equipment provided in the embodiments of the present invention obtain and print a first detection image and a second detection image to obtain a third detection image for performing nozzle color calibration. The position of the calibration portion in the third detection image can be used to quickly, simply, and accurately obtain the nozzle color offset information. Even if abnormal conditions such as unstable printing speed and paper feed speed, deformation of the printing medium, unstable grating or code disk signals occur, the color calibration value can be accurately obtained, and the technical staff can also be assisted in determining whether the printing device has the above-mentioned abnormal conditions, so that the equipment can be calibrated or corrected in time to ensure the image printing quality.

[0104] It should be clear that the present invention is not limited to the specific configuration and processing described above and shown in the figures. For the sake of simplicity, a detailed description of the known method is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of the present invention is not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between the steps after understanding the spirit of the present invention.

[0105] The functional blocks shown in the above-described block diagram can be implemented as hardware, software, firmware or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an application specific integrated circuit (ASIC), appropriate firmware, a plug-in, a function card, etc. When implemented in software, the elements of the present invention are programs or code segments that are used to perform the required tasks. The program or code segment can be stored in a machine-readable medium, or transmitted on a transmission medium or a communication link by a data signal carried in a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, optical fiber media, radio frequency (RF) links, etc. The code segment can be downloaded via a computer network such as the Internet, an intranet, etc.

[0106] It should also be noted that the exemplary embodiments mentioned in the present invention describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above steps, that is, the steps can be performed in the order mentioned in the embodiments, or in a different order from the embodiments, or several steps can be performed simultaneously.

[0107] The above is only a specific implementation of the present invention. Those skilled in the art can clearly understand that for the convenience and simplicity of description, the specific working process of the system, module and unit described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be covered within the protection scope of the present invention.

Claims

1. A method for printing a nozzle color detection chart, characterized in that: The method comprises: Acquire a first detection image and a second detection image, wherein the first detection image includes N first detection parts arranged along a first direction, each of the first detection parts includes a plurality of first detection lines arranged along the first direction and arranged in parallel along a second direction, each of the first detection lines is spaced apart by a preset pixel and the projections in the second direction overlap, and the first first detection lines in two adjacent first detection parts differ by one pixel in the second direction; the second detection image includes N second detection parts arranged in parallel along the first direction, each of the second detection parts includes a plurality of second detection lines arranged along the first direction and arranged in parallel along the second direction, the length and width of the second detection line are the same as those of the first detection line, each of the second detection lines is spaced apart by the preset pixel and the projections in the second direction overlap, and the first second detection lines in the N second detection parts are located on the same straight line in the second direction; wherein the second direction is in the same direction as the printing direction, the first direction is perpendicular to the second direction, and N is a natural number greater than or equal to 2; The first detection image and the second detection image are printed on a printing medium to obtain a third detection image for performing a nozzle color calibration.

2. The method for printing a nozzle color detection chart according to claim 1, characterized in that: The distance between two adjacent first detection parts in the first direction is zero, and the distance between two adjacent second detection parts in the first direction is zero.

3. The method for printing a nozzle color detection chart according to claim 1, characterized in that: The N is an odd number greater than or equal to 3.

4. The method for printing a nozzle color detection chart according to claim 1, characterized in that: The sum of widths and intervals of all the first detection lines in the first detection section is equal to the sum of widths and intervals of all the second detection lines in the second detection section.

5. The method for printing a nozzle color detection chart according to claim 3, characterized in that: The width of the first detection line and the second detection line are both (N-1) / 2 pixels, the first detection lines are spaced apart by (N-1) / 2 pixels, and the second detection lines are spaced apart by (N-1) / 2 pixels.

6. The method for printing a nozzle color detection chart according to claim 3, characterized in that: A calibration parameter is marked on either side or both sides of each of the first detection parts, wherein the calibration parameter corresponding to the mark of the first detection part located in the middle position is "0".

7. The method for printing a nozzle color detection chart according to claim 1, characterized in that: The step of printing the first detection image and the second detection image on a printing medium to obtain a third detection image for performing printhead color calibration comprises: Control the first channel in the nozzle group to print the first test image to a preset printing position on the printing medium to obtain a first printed test image; Control the second channel in the nozzle group to print the second inspection drawing to the preset printing position on the printing medium to obtain a second printed inspection drawing; Obtain the third test image according to the first printed test image and the second printed test image; The nozzle group includes at least one nozzle. When the nozzle group includes only one nozzle, the nozzle includes at least two channels. When the nozzle group includes more than two nozzles, each nozzle includes at least one column of channels. The first channel and the second channel are channels in the same nozzle or channels in different nozzles.

8. A method for obtaining a printhead color calibration value, characterized in that: The method comprises: Obtaining a third detection image as described in any one of claims 1 to 7, wherein the third detection image includes N third detection parts corresponding to the N first detection parts in the first detection image and N fourth detection parts corresponding to the N second detection parts in the second detection image, wherein each of the third detection parts includes a plurality of third detection lines arranged in parallel along the second direction, each of the fourth detection parts includes a plurality of fourth detection lines arranged in parallel along the second direction, and the third detection lines in one of the third detection parts and the fourth detection lines in one of the fourth detection parts are completely alternated or completely overlapped to obtain a calibration part; The nozzle color calibration value is determined according to the position of the calibration part.

9. The method for obtaining the printhead color calibration value according to claim 8, characterized in that: The method further comprises: Whether one or more of the following occurs during the printing process: unstable printing speed, unstable paper feeding speed, deformation of the printing medium, unstable grating signal, or unstable code disk signal, is determined according to the position change of the calibration portion.

10. A nozzle color detection chart printing device, characterized in that: The device comprises: A detection image acquisition module, used for acquiring a first detection image and a second detection image, wherein the first detection image includes N first detection parts arranged along a first direction, each of the first detection parts includes a plurality of first detection lines arranged along the first direction and arranged in parallel along a second direction, each of the first detection lines is spaced apart by a preset pixel and the projections in the second direction overlap, and the first first detection lines in two adjacent first detection parts differ by one pixel in the second direction; the second detection image includes N second detection parts arranged in parallel along the first direction, each of the second detection parts includes a plurality of second detection lines arranged along the first direction and arranged in parallel along the second direction, the length and width of the second detection lines are the same as those of the first detection lines, each of the second detection lines is spaced apart by the preset pixel and the projections in the second direction overlap, and the first second detection lines in the N second detection parts are located on the same straight line in the second direction; wherein the second direction is in the same direction as the printing direction, the first direction is perpendicular to the second direction, and N is a natural number greater than or equal to 2; The printing module is used to print the first detection image and the second detection image on a printing medium to obtain a third detection image used for nozzle color calibration.

11. A device for obtaining a printhead color calibration value, characterized in that: The device comprises: A calibration unit acquisition module, used for acquiring the third detection image as described in any one of claims 1 to 6, wherein the third detection image includes N third detection units corresponding to the N first detection units in the first detection image and N fourth detection units corresponding to the N second detection units in the second detection image, wherein each of the third detection units includes a plurality of third detection lines arranged in parallel along the second direction, each of the fourth detection units includes a plurality of fourth detection lines arranged in parallel along the second direction, and the third detection lines in one of the third detection units and the fourth detection lines in one of the fourth detection units are completely alternated or completely overlapped to obtain a calibration unit; The calibration value determination module is used to determine the printhead color calibration value according to the position of the calibration part.

12. An inkjet printing device, characterized in that: include: At least one processor, at least one memory and computer program instructions stored in the memory, when the computer program instructions are executed by the processor, implement the method according to any one of claims 1 to 9.

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