Resident printing method, device, equipment and medium based on different concentration curves

Abstract

The application discloses a resident printing method and device based on different concentration curves, equipment and medium, and relates to the field of inkjet printing technology.The method determines the average effective height of a single nozzle according to the number of overlapping nozzles, obtains a first step height according to the average effective height of the single nozzle, determines a first preset concentration curve and a second preset concentration according to the first step height, controls the nozzle group to scan ink along the main scanning direction according to the single scanning image data and the preset concentration curve, moves a distance of the first step height along the sub-scanning direction, and then scans ink along the main scanning direction according to the single scanning image data and the preset concentration curve again.The application splits the image data of each PASS in the resident printing into two times of printing according to different preset concentration curves, which is equivalent to feathering the printing area corresponding to each PASS, especially the splicing area of the nozzle, reduces the splicing path overlapping problem in the resident printing, and improves the image printing quality.

Description

Technical Field

[0001] This invention relates to the field of inkjet printing technology, and in particular to a dwell-type printing method, apparatus, equipment and medium based on different density curves. Background Technology

[0002] Inkjet printing technology refers to the technology of spraying ink droplets onto a printing medium through a printhead to obtain images or text. This technology is non-contact printing and has advantages such as high printing speed, low pollution, vibrant image colors, long image preservation time, and adaptability to various printing media. It has been widely used in advertising production, office supplies and equipment, and printing proofing.

[0003] In practical production applications, such as Figure 1 As shown, multiple printheads H1 to H4 are often combined into a printhead group with a height of G1 to increase the height of each printed image. When the print area is relatively small, a dwell-type printing method is usually used to improve efficiency, that is, the printhead scans and prints multiple times at the same position. Figure 2 The diagram illustrates a dwell-type printing process. A print carriage 10, equipped with a printhead assembly, reciprocates along the main scanning direction X. When the printing height (determined by the printhead assembly height) G1 of one scan is greater than or equal to the height G2 of the printing area 20 (or the printing width G2), and based on the image and printhead accuracy requirements, it is determined that a 4-pass scan is needed to achieve the required image accuracy, the print carriage will reciprocate the printing area 20 four times to complete the image printing. This process can be repeated in dwell-type printing. Figure 1 When printing images using the nozzle group shown, the splicing lines in the nozzle splicing areas (such as D1, D2, D3) will also overlap at the same location. The existing solution is usually to use a small stepping method in the sub-scanning direction Y between each PASS scan to stagger the nozzle splicing positions in each pass. However, since the stepping distance of the small stepping is often very small (usually less than one nozzle), the problem of overlapping splicing lines will still occur in the printing area corresponding to the nozzle splicing position, which will seriously affect the image printing quality. Summary of the Invention

[0004] In view of this, embodiments of the present invention provide a dwell printing method, apparatus, device and medium based on different concentration curves to solve the problem of overlapping stitches affecting image printing quality in the prior art.

[0005] In a first aspect, embodiments of the present invention provide a residence-type printing method based on different concentration curves, the method comprising:

[0006] Obtain the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group;

[0007] The average effective height of a single nozzle is determined based on the number of overlapping nozzles.

[0008] The first step height is obtained based on the average effective height of the single nozzle.

[0009] A first preset concentration curve and a second preset concentration curve are determined based on the first step height, wherein the second preset concentration curve is different from the first preset concentration curve;

[0010] Acquire the image data of each scan of the nozzle assembly, and record it as single scan image data;

[0011] After controlling the printhead assembly to scan and dispense ink in the forward direction along the main scanning direction based on the single scan image data and the first preset density curve, it moves the distance of the first step height along the secondary scanning direction perpendicular to the main scanning direction, and then scans and dispenses ink in the reverse direction along the main scanning direction based on the single scan image data and the second preset density curve.

[0012] Preferably, the first preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis, and the horizontal axis is divided into several intervals according to the first step height. Each interval includes a first sub-curve, and several first sub-curves constitute the first preset concentration curve. Except for the first first sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining first sub-curves gradually change from 0% to 100% or from 100% to 0%. The second preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis, and the horizontal axis is divided into several intervals according to the first step height. Each interval includes a second sub-curve, and several second sub-curves constitute the second preset concentration curve. Except for the last second sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining second sub-curves gradually change from 0% to 100% or from 100% to 0%.

[0013] Preferably, determining the average effective height of a single nozzle based on the number of overlapping nozzles includes:

[0014] Obtain the total number of nozzles in the nozzle group;

[0015] The total number of effective nozzles is obtained based on the total number of nozzles and the number of overlapping nozzles;

[0016] The average number of effective nozzles per nozzle is obtained based on the total number of effective nozzles and the number of nozzles in the nozzle group;

[0017] The average effective height of a single nozzle is obtained based on the average number of effective nozzles per nozzle.

[0018] Preferably, after obtaining the average effective number of nozzles per nozzle based on the total number of effective nozzles and the number of nozzles in the nozzle group, the method further includes:

[0019] The number of orifice-closing nozzles in each nozzle is determined based on the average effective number of nozzles per nozzle, the number of nozzles in a single nozzle, and the number of overlapping nozzles between adjacent nozzles.

[0020] Preferably, acquiring the image data of each scan of the nozzle assembly, denoted as single scan image data, includes:

[0021] Obtain the image precision of the image to be printed;

[0022] Obtain the single-shot printing accuracy of the printhead assembly;

[0023] The number of scans is determined based on the image accuracy and the single-print accuracy.

[0024] The single scan image data is obtained based on the number of scans and the image data of the image to be printed.

[0025] Preferably, the step of controlling the printhead assembly to scan and dispense ink along the main scanning direction based on the single scan image data and the preset density curve, and then moving the first step height distance along a secondary scanning direction perpendicular to the main scanning direction, and then scanning and dispensing ink along the main scanning direction based on the single scan image data and the preset density curve, includes:

[0026] The first feathering template is obtained based on the first preset concentration curve;

[0027] The second feathering template is obtained based on the second preset concentration curve;

[0028] The single-scan image data and the first feathered template are ANDed to obtain the first sub-single-scan image data;

[0029] The printhead assembly is controlled to scan and dispense ink along the main scanning direction based on the first sub-single scan image data.

[0030] Control the nozzle assembly to move the first step height along the sub-scanning direction;

[0031] The single-scan image data and the second feathered template are ANDed to obtain the second sub-single-scan image data;

[0032] The printhead assembly is controlled to emit ink along the main scanning direction based on the second sub-single scan image data.

[0033] Preferably, when the image height of the image to be printed along the sub-scanning direction is greater than or equal to the effective printing height, wherein the effective printing height is equal to the number of scans multiplied by the average effective height of a single printhead plus the first step height, the method further includes:

[0034] After the printhead assembly completes the scanning and printing of the current image printing area according to the number of scans, it moves along the sub-scanning direction by a second step height to the next printing area; wherein, the second step height is equal to the effective printing height;

[0035] The image data corresponding to the next printing area scanned by the printhead group each time is obtained and recorded as the next single scan image data;

[0036] After the printhead assembly scans and dispenses ink along the main scanning direction based on the next single-scan image data and the first preset density curve, it moves the distance of the first step height along the secondary scanning direction, and then scans and dispenses ink along the main scanning direction based on the next single-scan image data and the second preset density curve.

[0037] Secondly, embodiments of the present invention provide a residence-type printing device based on different concentration curves, the device comprising:

[0038] The overlapping nozzle count acquisition module is used to obtain the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group;

[0039] The module for obtaining and determining the average effective height of a single nozzle is used to determine the average effective height of a single nozzle based on the number of overlapping nozzles.

[0040] The first step height acquisition module is used to acquire the first step height based on the average effective height of the single nozzle.

[0041] A preset concentration curve determination module is used to determine a first preset concentration curve and a second preset concentration curve based on the first step height, wherein the second preset concentration curve is different from the first preset concentration curve;

[0042] The single-scan image data acquisition module is used to acquire the image data of each scan of the nozzle group, which is denoted as single-scan image data.

[0043] The printing module is used to control the printhead assembly to scan and dispense ink along the main scanning direction according to the single scan image data and the first preset density curve, then move the first step height distance along the secondary scanning direction perpendicular to the main scanning direction, and then scan and dispense ink along the main scanning direction according to the single scan image data and the second preset density curve.

[0044] Thirdly, embodiments of the present invention provide a residence-type printing device based on different concentration curves, comprising: at least one processor, at least one memory, and computer program instructions stored in the memory, wherein when the computer program instructions are executed by the processor, the method of the first aspect described above is implemented.

[0045] Fourthly, embodiments of the present invention provide a storage medium storing computer program instructions, which, when executed by a processor, implement the method of the first aspect described above.

[0046] In summary, the beneficial effects of the present invention are as follows:

[0047] The present invention provides a dwell-type printing method, apparatus, device, and medium based on different concentration curves. This involves: obtaining the number of overlapping nozzles in the printhead splicing area of ​​a printhead group; determining the average effective height of a single printhead based on the number of overlapping nozzles; obtaining a first step height based on the average effective height of a single printhead; determining a first preset concentration curve and a second preset concentration curve based on the first step height, wherein the second preset concentration curve is different from the first preset concentration curve; obtaining image data from each scan of the printhead group, denoted as single scan image data; and controlling the printhead group to print based on the single scan image data and the first preset concentration curve. After the curve scans and emits ink along the main scanning direction, it moves the distance of the first step height along the secondary scanning direction perpendicular to the main scanning direction. Then, based on the single scan image data and the second preset density curve, it scans and emits ink along the main scanning direction. This invention splits the image data of each PASS in dwell printing into two printings according to the first and second preset density curves. This is equivalent to feathering the printing area in each PASS, especially the printing area corresponding to the printhead splicing area, thereby reducing the splicing lines in each PASS, reducing the splicing line superposition problem in dwell printing, and improving the image printing quality. Attached Figure Description

[0048] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, and these are all within the protection scope of the present invention.

[0049] Figure 1 This is a schematic diagram of multiple nozzles spliced ​​together to form a nozzle group in the background technology.

[0050] Figure 2 This is a schematic diagram of resident printing in the background art.

[0051] Figure 3 This is a schematic flowchart of a residence-type printing method based on different concentration curves according to an embodiment of the present invention.

[0052] Figure 4 This is a schematic diagram of the nozzle assembly according to an embodiment of the present invention.

[0053] Figure 5This is a schematic diagram of the image data of the image to be printed according to an embodiment of the present invention.

[0054] Figure 6 This is a schematic diagram of the preset concentration curve in an embodiment of the present invention.

[0055] Figure 7 This is a schematic diagram of the feathering template according to an embodiment of the present invention.

[0056] Figure 8 This is a schematic flowchart of a residence-type printing method based on different concentration curves according to an embodiment of the present invention.

[0057] Figure 9 This is a schematic diagram of the first preset concentration curve and the second preset concentration curve according to an embodiment of the present invention.

[0058] Figure 10a This is a schematic diagram of the first feathering template in an embodiment of the present invention.

[0059] Figure 10b This is a schematic diagram of the second feathering template in an embodiment of the present invention.

[0060] Figure 11 This is a schematic diagram of the structure of a residence-type printing device based on different concentration curves according to an embodiment of the present invention.

[0061] Figure 12 This is a schematic diagram of the structure of a residence-type printing device based on different concentration curves according to an embodiment of the present invention. Detailed Implementation

[0062] The features and exemplary embodiments of various aspects of the present invention will now be described in detail. To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. 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 practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the invention.

[0063] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0064] Example 1

[0065] This invention provides a residence-based printing method based on a density curve. This method is applicable to residence-based printing. The residence-based printing device includes at least a printing carriage, which houses a printhead assembly composed of multiple printheads. The printing carriage can reciprocate along the main scanning direction X (forward and reverse) to scan and print an image, and can also move in a stepping motion along the secondary scanning direction Y. In actual printing, the forward and reverse directions of the main scanning direction are determined according to the specific circumstances, such as... Figure 2 The main scanning direction X can be set from right to left (positive X) and from left to right (negative X).

[0066] Please see Figure 3 The residence-based printing method based on concentration curves specifically includes the following steps:

[0067] S1: Obtain the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group;

[0068] S2: Determine the average effective height of a single nozzle based on the number of overlapping nozzles;

[0069] S3: Obtain the first step height based on the average effective height of the single nozzle;

[0070] S4: Determine the preset concentration curve based on the first step height;

[0071] S5: Acquire the image data of each scan of the nozzle group, and record it as single scan image data;

[0072] S6: After the printhead assembly scans and dispenses ink along the main scanning direction based on the single scan image data and the preset density curve, it moves the distance of the first step height along the secondary scanning direction perpendicular to the main scanning direction, and then scans and dispenses ink along the main scanning direction based on the single scan image data and the preset density curve.

[0073] Specifically, when an inkjet printer's printhead assembly consists of multiple printheads joined together, there will be some overlap at the joints between adjacent printheads or within the joint area. For example... Figure 1 The nozzles of printhead H1 in the printhead splicing area D1 are overlapping nozzles of printhead H1, and the nozzles of printhead H2 in the printhead splicing area D1 are overlapping nozzles of printhead H2. If the overlapping nozzles in the two spliced ​​printheads both emit ink, the ink volume in the corresponding printing area of ​​the printhead splicing area will increase, thereby increasing the image density and affecting the printing effect. In printing, the overlapping nozzles in one printhead are often turned off (also known as orifice shut-off), while the overlapping nozzles in the other printhead emit ink normally to avoid increasing the print density. Therefore, the actual number of nozzles emitting ink in the printhead group will be less than the sum of the number of nozzles in all printheads. In this embodiment of the invention, the nozzles that actually emit ink are called effective nozzles, and the actual printing height or effective height of each printhead during printing is defined by the number of effective nozzles in each printhead. For example, if the number of overlapping nozzles in printhead H1 and printhead H2 is 20, and all nozzles of printhead H1 output ink normally during printing, while the 20 overlapping nozzles in printhead H2 are closed, then the effective number of nozzles in H1 is 800 and its effective height is 800, and the effective number of nozzles in H2 is 780 and its effective height is 780.

[0074] In this embodiment of the invention, the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group in step S1 refers to the total number of overlapping nozzles in the nozzle group. Based on the number of overlapping nozzles, the total number of effective nozzles or the total effective height of the nozzle group can be obtained, thereby further determining the average effective height of a single nozzle.

[0075] Preferably, determining the average effective height of a single nozzle based on the number of overlapping nozzles includes:

[0076] Obtain the total number of nozzles in the nozzle group;

[0077] The total number of effective nozzles is obtained based on the total number of nozzles and the number of overlapping nozzles;

[0078] The average number of effective nozzles per nozzle is obtained based on the total number of effective nozzles and the number of nozzles in the nozzle group;

[0079] The average effective height of a single nozzle is obtained based on the average number of effective nozzles per nozzle.

[0080] For example, in embodiments of the present invention, such as Figure 4 The printhead group shown is used for inkjet printing. The number of nozzles in printheads H1, H2, H3 and H4 is 800. The number of overlapping nozzles in the splicing area of ​​each printhead is represented by D12, D23 and D34 respectively, where D12 = 42, D23 = 38 and D34 = 40.

[0081] The total number of nozzles in the nozzle assembly is 800 × 4 = 3200. After splicing the four nozzles, the total number of effective nozzles is 800 × 4 - D12 - D23 - D34 = 3080. Dividing this number of effective nozzles into four equal parts according to the number of nozzles, each part contains 3080 ÷ 4 = 770 nozzles. This number is denoted as the average number of effective nozzles per nozzle. Figure 4 As shown, the average number of effective nozzles per nozzle is 770, and the corresponding average effective height per nozzle is L = L1 = L2 = L3 = L4 = 770.

[0082] Preferably, after obtaining the average number of effective nozzles per nozzle, the method further includes: determining the number of orifice-closing nozzles in each nozzle based on the average number of effective nozzles per nozzle, the number of nozzles in a single nozzle, and the number of overlapping nozzles between two adjacent nozzles.

[0083] To achieve the actual printing height of each printhead equal to the average effective height of a single printhead, it is necessary to determine the number of nozzles with closed orifices in each printhead and then close these nozzles accordingly. For example, to achieve an average effective height of 770 for a single printhead, the following settings are made for each printhead: 2 nozzles (D12_2) closed on the right side of printhead H1, 1 nozzle (D12_1) closed on the left side of printhead H2, 2 nozzles (D23_2) closed on the right side of printhead H2, 1 nozzle (D23_1) closed on the left side of printhead H3, 2 nozzles (D34_2) closed on the right side of printhead H3, and 1 nozzle (D34_1) closed on the left side of printhead H4. Where:

[0084] D12_2 = 800 - L1 = 30;

[0085] D12_1 = D12 - D12_2 = 12;

[0086] D23_2=800×2-D12-L1-L2=20;

[0087] D23_1 = D23 - D23_2 = 20;

[0088] D34_2=800×3-D12-D23-L1-L2-L3=10;

[0089] D34_1 = D34 - D34_2 = 30.

[0090] Furthermore, the first step height can be obtained from the average effective height of a single nozzle, where the first step height is half of the average effective height of a single nozzle, denoted as L / 2. For example, if the average effective height of a single nozzle is 770, then the first step height is 385 (the distance of 385 nozzles).

[0091] Preferably, acquiring the image data of each scan of the nozzle assembly, denoted as single scan image data, includes:

[0092] Obtain the image precision of the image to be printed;

[0093] Obtain the single-shot printing accuracy of the printhead assembly;

[0094] The number of scans is determined based on the image accuracy and the single-print accuracy.

[0095] The single scan image data is obtained based on the number of scans and the image data of the image to be printed.

[0096] For example, suppose the image resolution of the image to be printed is 720×1200, and the printing resolution of one scan by the printhead assembly (denoted as single-scan printing resolution is 360×600), and the printing mode is dwell printing. Then the number of scans is (720÷360)×(1200÷600)=4. Accordingly, the image data to be printed needs to be divided into four parts, and ink is dispensed and printed for each scan. Therefore, each part of the image data is recorded as single-scan image data. Figure 5 As shown, in existing dwell printing, during the first scan (first PASS), ink is output to print single-scan image data labeled 1; during the second scan (second PASS), ink is output to print single-scan image data labeled 2; during the third scan (third PASS), ink is output to print single-scan image data labeled 3; and during the fourth scan (fourth PASS), ink is output to print single-scan image data labeled 4. To avoid the problem of splicing lines appearing at the printing positions corresponding to the printhead splicing areas in the printhead assembly during dwell printing, in this embodiment of the invention, the single-scan image data corresponding to each PASS is divided into two prints, and the image data in these two prints (referred to as the first sub-single-scan image data and the second sub-single-scan image data, respectively) have complementary density, so that the sum of the two image data (the first sub-single-scan image data and the second sub-single-scan image data) equals the single-scan image data.

[0097] In this embodiment of the invention, the printing of the first pass is used as an example to illustrate how to split and print image data from a single scan. First, a preset density curve is determined. Preferably, the preset density curve has the image height as the horizontal axis and the density ratio as the vertical axis, and the horizontal axis is divided into several intervals according to the first step height. Each interval includes a sub-curve, and the density ratio of the several sub-curves gradually changes from 0% to 100% or from 100% to 0%.

[0098] like Figure 6 As shown, the preset concentration curve uses image height (i.e., the length of the image in the sub-scanning direction) as the horizontal axis and concentration ratio as the vertical axis. The horizontal axis is divided into several intervals based on the step height (L / 2), each interval being L / 2 in length. Each interval contains a sub-curve. In other words, the concentration relationship curve is divided into several sub-curves based on the step height (L / 2). The concentration of these sub-curves gradually changes from 0% to 100% or from 100% to 0% within each L / 2 interval. For example, the concentration ratio of the sub-curve in the 0–L / 2 interval of Pass0_1 or the L / 2–L interval of Pass0_2 gradually changes from 0% to 100%. Similarly, the concentration ratio of the sub-curve in the L / 2–L interval of Pass0_1 or the L–3L / 2 interval of Pass0_2 gradually changes from 100% to 0%. This continues until the last interval gradually changes from 100% to 0%. Preferably, each sub-curve is a line segment. In other embodiments, the sub-curve can also be a quadratic function curve, etc., and the concentrations of two adjacent sub-curves are symmetrically distributed along the boundary lines of each interval.

[0099] After obtaining the preset concentration curve, the original first pass is printed in two separate printouts. For example... Figure 6 As shown, when the printhead assembly starts scanning ink along the main scanning direction from the position where the image height is 0, it first prints the single-scan image data corresponding to the original first PASS according to the preset density curve in Pass0_1. Then, the printhead assembly moves one step distance (L / 2) along the secondary scanning direction, that is, moves to the position where the image height is L / 2. Then, it prints the single-scan image data corresponding to the original first PASS according to the preset density curve in Pass0_2. Figure 6 It can be seen that the image data printed twice according to the preset concentration curve are complementary in concentration. In addition to the 0 to L / 2 interval in Pass0_1 and the 4L to 9L / 2 interval in Pass0_2, the image data concentration in the L / 2 to L interval of Pass0_1 is complementary to the image data concentration in the L / 2 to L interval of Pass0_2, the image data concentration in the L to 3L / 2 interval of Pass0_1 is complementary to the image data concentration in the L to 3L / 2 interval of Pass0_2, and so on. Finally, the sum of the data printed twice by Pass0_1 and Pass0_2 is the single scan image data of the original first PASS.

[0100] In Pass0_1 and Pass0_2, printing the single-scan image data corresponding to the original first PASS according to the preset concentration curve can be achieved in the following way:

[0101] Obtain the feathering template based on the preset concentration curve;

[0102] The single-scan image data and the feathered template are ANDed to obtain the first sub-single-scan image data;

[0103] The printhead assembly is controlled to scan and dispense ink along the main scanning direction based on the first sub-single scan image data.

[0104] Control the nozzle assembly to move the first step height along the sub-scanning direction;

[0105] The first sub-single scan image data is inverted to obtain the second sub-single scan image data;

[0106] The printhead assembly is controlled to scan and dispense ink along the main scanning direction based on the second sub-single scan image data.

[0107] Specifically, a feathering template is obtained based on the preset concentration curve. The height M1 of the feathering template in the sub-scanning direction Y is the same as the nozzle assembly height G1, as shown below. Figure 7 As shown, the feathering template is divided into several sub-template intervals according to the first step height L / 2. The height of each sub-template interval (in the sub-scanning direction Y) is L / 2, and the data concentration of the first sub-template gradually changes from 0% to 100% from left to right, the data concentration of the second sub-template gradually changes from 100% to 0%, the data concentration of the third sub-template gradually changes from 0% to 100%, and so on. The single-scan image data corresponding to the first PASS is ANDed with the feathering template to obtain the first sub-single-scan image data; then the printhead group is controlled to scan and print an image along the main scanning direction according to the first sub-single-scan image data; after completing one scan, the printhead group is controlled to move one step height along the sub-scanning direction; the first sub-single-scan image data is inverted to obtain the second sub-single-scan image data; the printhead group is controlled to scan and print an image along the main scanning direction according to the second sub-single-scan image data. After two scans, the image is printed by... Figure 6 It can be seen that, in addition to interval and Only half of the original data for the two designated areas can be printed within a given interval. For other areas, due to the complementary printing density from the two scans, the final printed data matches the original data. Therefore, the actual effective printing area of ​​the image is... Similarly, the printing of the second, third, and fourth passes is the same as that of the first pass, and will not be repeated here. This completes the resident printing of 4 passes.

[0108] If the height of the image to be printed is less than or equal to The image will be fully printed after 4-pass dwell printing. If the height of the image to be printed is greater than... After performing the 4-pass dwell printing described above, the system moves to the next area using a large stepping motion. The specific steps are as follows:

[0109] After the printhead assembly completes the scanning and printing of the current image printing area according to the number of scans, it moves along the sub-scanning direction by a second step height to the next printing area; wherein, the second step height is equal to the effective printing height;

[0110] The image data corresponding to the next printing area scanned by the printhead group each time is obtained and recorded as the next single scan image data;

[0111] After controlling the printhead assembly to scan and dispense ink along the main scanning direction based on the next single-scan image data and the preset density curve, it moves the distance of the first step height along the secondary scanning direction, and then scans and dispenses ink along the main scanning direction again based on the next single-scan image data and the preset density curve.

[0112] The effective print height here refers to the actual effective height of the image after one persistent printing cycle. In this embodiment of the invention, the effective print height is... This is equal to the number of scans multiplied by the average effective height of a single printhead, minus the first step height. After controlling the printhead assembly to move a distance of the second step height (the second step height equals the effective printing height) along the sub-scanning direction, the next image area is printed according to the 4PASS printing method described above. If the image is not yet printed, the printhead assembly is again controlled to move a distance of the second step height along the sub-scanning direction, and this printing process is repeated until all images are printed.

[0113] In summary, the dwell printing method based on different density curves provided by this invention involves: obtaining the number of overlapping nozzles in the printhead splicing area of ​​the printhead group; determining the average effective height of a single printhead based on the number of overlapping nozzles; obtaining a first step height based on the average effective height of a single printhead; determining a preset density curve based on the first step height; obtaining image data from each scan of the printhead group, recorded as single scan image data; controlling the printhead group to scan and dispense ink along the main scanning direction according to the single scan image data and the preset density curve, then moving the printhead group a distance equal to the first step height along a secondary scanning direction perpendicular to the main scanning direction, and then scanning and dispensing ink again along the main scanning direction according to the single scan image data and the preset density curve. This invention splits the image data of each pass in dwell printing into two prints based on the preset density curve, effectively feathering the print area corresponding to the printhead splicing area in each pass, thereby reducing splicing lines in each pass, mitigating the problem of splicing line overlap in dwell printing, and improving image printing quality.

[0114] Example 2

[0115] Based on Embodiment 1 above, Embodiment 2 of the present invention provides a residence-type printing method based on different concentration curves. This method is applicable to residence-type printing. The residence-type printing device includes at least a printing carriage, in which a printhead assembly composed of multiple printheads is installed. The printing carriage can reciprocate along the main scanning direction X to scan and print an image, and can also move in a stepping motion along the secondary scanning direction Y. In actual printing, the direction of the main scanning direction (forward and reverse) depends on the actual situation, such as... Figure 2 The main scanning direction (X) can be set from right to left (positive X) and from left to right (negative X). Alternatively, it can be set from right to left (negative X) and from left to right (positive X). Please refer to [link to relevant documentation]. Figure 8 The method specifically includes the following steps:

[0116] S10: Obtain the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group;

[0117] S20: Determine the average effective height of a single nozzle based on the number of overlapping nozzles;

[0118] S30: Obtain the first step height based on the average effective height of the single nozzle;

[0119] S40: Determine a first preset concentration curve and a second preset concentration curve based on the first step height, wherein the second preset concentration curve is different from the first preset concentration curve;

[0120] S50: Acquire the image data of each scan of the nozzle group, and record it as single scan image data;

[0121] S60: After the printhead assembly scans and dispenses ink along the main scanning direction based on the single scan image data and the first preset density curve, it moves the distance of the first step height along the secondary scanning direction perpendicular to the main scanning direction, and then scans and dispenses ink along the main scanning direction based on the single scan image data and the second preset density curve.

[0122] The first preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height. Each interval includes a first sub-curve. Several first sub-curves constitute the first preset concentration curve. Except for the first first sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining first sub-curves gradually change from 0% to 100% or from 100% to 0%. The second preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height. Each interval includes a second sub-curve. Several second sub-curves constitute the second preset concentration curve. Except for the last second sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining second sub-curves gradually change from 0% to 100% or from 100% to 0%.

[0123] Specifically, as can be seen from the preset concentration curve shown in Example 1, due to the fact that... interval and Only half of the original data in the two designated areas can be printed within a given interval. For other areas, due to the complementary printing density from the two scans, the final printed data matches the original data. Therefore, the actual effective printing interval of the image is... and interval and The intervals are then referred to as invalid printing intervals. To avoid this situation, this embodiment of the invention provides another preset concentration curve to ensure that all printing intervals are valid printing intervals.

[0124] In this embodiment of the invention, the steps of obtaining the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group, determining the average effective height of a single nozzle based on the number of overlapping nozzles, and obtaining the first step height based on the average effective height of a single nozzle are the same as those described in Embodiment 1 above, and will not be repeated here. In Embodiment 2 of the invention, the focus is on how to determine the first preset concentration curve and the second preset concentration curve based on the first step height.

[0125] like Figure 9As shown, the first preset concentration curve corresponds to the curve shown in Pass0_1. Similarly, the first preset concentration curve uses the image height (i.e., the length of the image in the sub-scanning direction) as the horizontal axis and the concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height (L / 2), and the length of each interval is L / 2. Each interval contains a first sub-curve, that is, the first concentration relationship curve is divided into several first sub-curves according to the first step height (L / 2). In the first interval, i.e., the 0 to L / 2 interval, the concentration ratio is 100%. In the L / 2 to L interval, it gradually changes from 100% to 0%. In the L to 3L / 2 interval, it gradually changes from 0% to 100%, and so on, until it gradually changes from 100% to 0% in the last interval (7L / 2 to 4L). Preferably, each first sub-curve is a straight line. In other embodiments, in addition to the first sub-curve in the interval from 0 to L / 2, the first sub-curve in other intervals can also be a quadratic function curve, etc., and the concentrations of two adjacent first sub-curves are symmetrically distributed along the boundary lines of each interval.

[0126] The second preset concentration curve corresponds to the curve shown in Pass0_2. The second preset concentration curve uses the image height (i.e., the length of the image in the sub-scanning direction) as the horizontal axis and the concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height (L / 2), and the length of each interval is L / 2. Each interval contains a second sub-curve. That is, the second concentration relationship curve is divided into several second sub-curves according to the first step height (L / 2). In the interval from 0 to L / 2, the concentration ratio is 0%. In the interval from L / 2 to L, it gradually changes from 0% to 100%. In the interval from L to 3L / 2, it gradually changes from 100% to 0%, and so on, until it gradually changes from 100% to 0% in the last interval (4L to 9L / 2). Preferably, each second sub-curve is a straight line. In other embodiments, in addition to the second sub-curves in the 0 to L / 2 interval and the 4L to 9L / 2 interval, the second sub-curves in other intervals can also be quadratic function curves, etc., and the concentrations of two adjacent second sub-curves are symmetrically distributed along the boundary lines of each interval.

[0127] After obtaining the first and second preset concentration curves, the original first PASS is printed in two separate printouts. For example... Figure 9 As shown, when the printhead assembly starts scanning ink along the main scanning direction from the position where the image height is 0, it first prints the single-scan image data corresponding to the original first PASS according to the first preset density curve in Pass0_1. Then, the printhead assembly moves one step distance (L / 2) along the sub-scanning direction, that is, moves to the position where the image height is L / 2. Then, it prints the single-scan image data corresponding to the original first PASS according to the second preset density curve in Pass0_2. Figure 9It can be seen that the image data printed twice according to the first preset concentration curve and the second preset concentration curve are complementary in concentration. For example, the concentration of image data in the 0 to L / 2 interval of Pass0_1 is complementary to the concentration of image data in the 0 to L / 2 interval of Pass0_2; the concentration of image data in the L / 2 to L interval of Pass0_1 is complementary to the concentration of image data in the L / 2 to L interval of Pass0_2; the concentration of image data in the L to 3L / 2 interval of Pass0_1 is complementary to the concentration of image data in the L to 3L / 2 interval of Pass0_2... Finally, the sum of the data printed twice by Pass0_1 and Pass0_2 is the single scan image data of the original first PASS.

[0128] Specifically, in Pass0_1 and Pass0_2, printing the single-scan image data corresponding to the original first PASS according to the first preset concentration curve and the second preset concentration curve can be achieved in the following way:

[0129] The first feathering template is obtained based on the first preset concentration curve;

[0130] The second feathering template is obtained based on the second preset concentration curve;

[0131] The single-scan image data and the first feathered template are ANDed to obtain the first sub-single-scan image data;

[0132] The printhead assembly is controlled to scan and dispense ink along the main scanning direction based on the first sub-single scan image data.

[0133] Control the nozzle assembly to move the first step height along the sub-scanning direction;

[0134] The single-scan image data and the second feathered template are ANDed to obtain the second sub-single-scan image data;

[0135] The printhead assembly is controlled to emit ink along the main scanning direction based on the second sub-single scan image data.

[0136] Specifically, a first feathering template is obtained based on the first preset concentration curve. The height M1 of the first feathering template in the sub-scanning direction Y is the same as the nozzle assembly height G1, such as... Figure 10aAs shown, the first feathering template is divided into several sub-template intervals based on the first step height L / 2. The height of each sub-template interval (in the sub-scanning direction Y) is L / 2. Starting from the left, the data concentration of the first sub-template is 100%, the data concentration of the second sub-template gradually decreases from 100% to 0%, the data concentration of the third sub-template gradually decreases from 0% to 100%, and so on. The second feathering template is obtained according to the second preset concentration curve. The height M1 of the second feathering template in the sub-scanning direction Y is the same as the nozzle assembly height G1. Figure 10b As shown, the second feathering template is divided into several sub-template intervals based on the first step height L / 2. Each sub-template interval (in the sub-scanning direction Y) has a height of L / 2. Starting from the left, the data concentration of the first sub-template gradually changes from 0% to 100%, the second sub-template from 100% to 0%, the third sub-template from 0% to 100%, and so on, until the last sub-template has a data concentration of 100%. Furthermore, the second sub-template in the first feathering template is complementary to the first sub-template in the second feathering template, the third sub-template in the first feathering template is complementary to the second sub-template in the second feathering template, and so on, until the Nth sub-template in the first feathering template is complementary to the (N-1)th sub-template in the second feathering template. N is greater than or equal to 2.

[0137] The first sub-single scan image data corresponding to the first PASS is ANDed with the first feathering template to obtain the first sub-single scan image data; then, the printhead assembly is controlled to scan and print an image along the main scanning direction based on the first sub-single scan image data; after completing one scan, the printhead assembly is controlled to move one step height along the secondary scanning direction; similarly, the single scan image data and the second feathering template are ANDed to obtain the second sub-single scan image data; the printhead assembly is controlled to scan and print an image along the main scanning direction based on the second sub-single scan image data. After two scans, the image is printed by... Figure 9 It can be seen that, including interval and Because the two scans produced complementary data in terms of printing density, the final printed data in all areas within the specified interval is consistent with the original data. Therefore, the actual effective printing area of ​​the image is... Similarly, the printing of the second, third, and fourth passes is the same as that of the first pass, and will not be repeated here. This completes the resident printing of 4 passes.

[0138] If the height of the image to be printed is less than or equal to The image will be fully printed after 4-pass dwell printing. If the height of the image to be printed is greater than... After performing the 4-pass dwell printing described above, the system moves to the next area using a large stepping motion. The specific steps are as follows:

[0139] After the printhead assembly completes the scanning and printing of the current image printing area according to the number of scans, it moves along the sub-scanning direction by a second step height to the next printing area; wherein, the second step height is equal to the effective printing height;

[0140] The image data corresponding to the next printing area scanned by the printhead group each time is obtained and recorded as the next single scan image data;

[0141] After the printhead assembly scans and dispenses ink along the main scanning direction based on the next single-scan image data and the first preset density curve, it moves the distance of the first step height along the secondary scanning direction, and then scans and dispenses ink along the main scanning direction based on the next single-scan image data and the second preset density curve.

[0142] The effective print height here refers to the actual effective height of the image after one persistent printing cycle. In this embodiment of the invention, the effective print height is... This is equal to the number of scans multiplied by the average effective height of a single nozzle, plus the first step height. The nozzle assembly is then moved along the sub-scanning direction by a second step height. After the second step height is equal to the effective printing height, the next image area is printed according to the 4PASS printing method described above. If the image is not yet printed, the printhead group is controlled to move the second step height along the sub-scanning direction again, and this printing process is repeated until all images are printed.

[0143] In summary, the dwell printing method based on different density curves provided by this invention involves: obtaining the number of overlapping nozzles in the printhead splicing area of ​​the printhead group; determining the average effective height of a single printhead based on the number of overlapping nozzles; obtaining a first step height based on the average effective height of a single printhead; determining a first preset density curve and a second preset density curve based on the first step height, wherein the second preset density curve is different from the first preset density curve; obtaining image data from each scan of the printhead group, denoted as single scan image data; and controlling the printhead group to print based on the single scan image data and the first preset density curve. After scanning ink along the main scanning direction, the device moves a distance equal to the first step height along a secondary scanning direction perpendicular to the main scanning direction. Then, based on the single scan image data and the second preset density curve, ink is scanned again along the main scanning direction. This invention splits the image data of each pass in dwell printing into two printouts based on the first and second preset density curves. This is equivalent to feathering the printout area in each pass, especially in the printhead splicing area, thereby reducing splicing lines in each pass, mitigating the problem of splicing line overlap in dwell printing, and improving image printing quality.

[0144] Example 3

[0145] Please see Figure 11 Based on the above embodiment one, this embodiment of the invention provides a residence-type printing device 400 based on different concentration curves, the device 400 comprising:

[0146] The overlapping nozzle count acquisition module 401 is used to acquire the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group;

[0147] The single nozzle average effective height acquisition and determination module 402 is used to determine the single nozzle average effective height based on the number of overlapping nozzles;

[0148] The first step height acquisition module 403 is used to acquire the first step height based on the average effective height of the single nozzle.

[0149] The preset concentration curve determination module 404 is used to determine a first preset concentration curve and a second preset concentration curve based on the first step height, wherein the second preset concentration curve is different from the first preset concentration curve.

[0150] The single-scan image data acquisition module 405 is used to acquire the image data of each scan of the nozzle group, which is denoted as single-scan image data.

[0151] The printing module 406 is used to control the printhead assembly to scan and dispense ink along the main scanning direction according to the single scan image data and the first preset density curve, and then move the first step height distance along the secondary scanning direction perpendicular to the main scanning direction, and then scan and dispense ink along the main scanning direction according to the single scan image data and the second preset density curve.

[0152] In summary, the dwell printing device based on different density curves provided in this embodiment of the invention obtains the number of overlapping nozzles in the printhead splicing area of ​​the printhead group; determines the average effective height of a single printhead based on the number of overlapping nozzles; obtains a first step height based on the average effective height of a single printhead; determines a first preset density curve and a second preset density curve based on the first step height, wherein the second preset density curve is different from the first preset density curve; obtains image data of each scan of the printhead group, and records it as single scan image data; controls the printhead group to scan and dispense ink along the main scanning direction according to the single scan image data and the first preset density curve, and then moves the distance of the first step height along a secondary scanning direction perpendicular to the main scanning direction, and then scans and dispenses ink along the main scanning direction according to the single scan image data and the second preset density curve. This invention splits the image data of each PASS in dwell printing into two printing operations based on different first and second preset density curves. This is equivalent to feathering the printing area in each PASS, especially the printhead splicing area, thereby reducing the splicing lines in each PASS, alleviating the problem of splicing line overlap in dwell printing, and improving the image printing quality.

[0153] Example 4

[0154] Furthermore, the residence-based printing method based on different concentration curves in this embodiment of the invention can be implemented by a residence-based printing device based on different concentration curves. Figure 12 A schematic diagram of the hardware structure of a residence-type printing device based on different concentration curves provided in an embodiment of the present invention is shown.

[0155] A residence-based printing device based on different concentration curves may include a processor 301 and a memory 302 storing computer program instructions.

[0156] Specifically, the processor 301 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement embodiments of the present invention.

[0157] Memory 302 may include mass storage for data or instructions. For example, and not limitingly, memory 302 may include a hard disk drive (HDD), a floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or a Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 302 may include removable or non-removable (or fixed) media. Where appropriate, memory 302 may be internal or external to a data processing device. In a particular embodiment, memory 302 is a non-volatile solid-state memory. In a particular embodiment, memory 302 includes read-only memory (ROM). Where appropriate, 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 flash memory, or a combination of two or more of these.

[0158] The processor 301 reads and executes computer program instructions stored in the memory 302 to implement any of the residence-type printing methods based on different concentration curves in the above embodiments.

[0159] In one example, the residence-based printing device based on different concentration curves may also include a communication interface 303 and a bus 310. Wherein, such as Figure 12 As shown, the processor 301, memory 302, and communication interface 303 are connected through bus 310 and complete communication with each other.

[0160] The communication interface 303 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of the present invention.

[0161] Bus 310 includes hardware, software, or both, that couples components of a dwell-based printing device based on different density profiles together. For example, and not limitingly, bus 310 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 310 may include one or more buses. While specific buses are described and illustrated in embodiments of the invention, the invention contemplates any suitable bus or interconnect.

[0162] Example 5

[0163] Furthermore, in conjunction with the residence-based printing methods based on different concentration curves in the above embodiments, this invention can be implemented using a computer-readable storage medium. This computer-readable storage medium stores computer program instructions; when executed by the processor 301, these computer program instructions implement any of the residence-based printing methods based on different concentration curves in the above embodiments.

[0164] It should be clarified that the present invention is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are 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. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of the present invention.

[0165] The functional blocks shown in the above-described structural diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this invention are programs or code segments used to perform the required tasks. The programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals 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, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0166] It should also be noted that the exemplary embodiments mentioned in this invention describe methods or systems based on a series of steps or apparatus. However, this invention is not limited to the order of the steps described above; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0167] The above description is merely a specific embodiment of the present invention. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the protection scope of the present invention.

Claims

1. A residence-type printing method based on different concentration curves, characterized in that, The method uses a printhead assembly composed of multiple printheads for dwell printing, including: Obtain the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group; The average effective height of a single nozzle is determined based on the number of overlapping nozzles. The first step height is obtained based on the average effective height of the single nozzle. A first preset concentration curve and a second preset concentration curve are determined based on the first step height, wherein the second preset concentration curve is different from the first preset concentration curve; Acquire the image data of each scan of the nozzle assembly, and record it as single scan image data; After controlling the printhead assembly to scan and dispense ink in the forward direction along the main scanning direction according to the single scan image data and the first preset density curve, it moves the distance of the first step height along the sub-scanning direction perpendicular to the main scanning direction, and then scans and dispenses ink in the reverse direction along the main scanning direction according to the single scan image data and the second preset density curve. The first preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height. Each interval includes a first sub-curve. Several first sub-curves constitute the first preset concentration curve. Except for the first first sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining first sub-curves gradually change from 0% to 100% or from 100% to 0%. The second preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height. Each interval includes a second sub-curve. Several second sub-curves constitute the second preset concentration curve. Except for the last second sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining second sub-curves gradually change from 0% to 100% or from 100% to 0%.

2. The residence-type printing method based on different concentration curves according to claim 1, characterized in that, The step of determining the average effective height of a single nozzle based on the number of overlapping nozzles includes: Obtain the total number of nozzles in the nozzle group; The total number of effective nozzles is obtained based on the total number of nozzles and the number of overlapping nozzles; The average number of effective nozzles per nozzle is obtained based on the total number of effective nozzles and the number of nozzles in the nozzle group; The average effective height of a single nozzle is obtained based on the average number of effective nozzles per nozzle.

3. The residence-type printing method based on different concentration curves according to claim 2, characterized in that, After obtaining the average effective number of nozzles per nozzle based on the total number of effective nozzles and the number of nozzles in the nozzle group, the method further includes: The number of orifice-closing nozzles in each nozzle is determined based on the average effective number of nozzles per nozzle, the number of nozzles in a single nozzle, and the number of overlapping nozzles between adjacent nozzles.

4. The residence-type printing method based on different concentration curves according to claim 1, characterized in that, The step of acquiring image data for each scan of the nozzle assembly, denoted as single scan image data, includes: Obtain the image precision of the image to be printed; Obtain the single-shot printing accuracy of the printhead assembly; The number of scans is determined based on the image accuracy and the single-print accuracy. The single scan image data is obtained based on the number of scans and the image data of the image to be printed.

5. The residence-type printing method based on different concentration curves according to claim 1, characterized in that, The process of controlling the printhead assembly to scan and dispense ink in the forward direction along the main scanning direction based on the single scan image data and the first preset density curve, then moving the first step height distance along the secondary scanning direction perpendicular to the main scanning direction, and then scanning and dispensing ink in the reverse direction along the main scanning direction based on the single scan image data and the second preset density curve includes: The first feathering template is obtained based on the first preset concentration curve; The second feathering template is obtained based on the second preset concentration curve; The single-scan image data and the first feathered template are ANDed to obtain the first sub-single-scan image data; The printhead assembly is controlled to scan and dispense ink along the main scanning direction based on the first sub-single scan image data. Control the nozzle assembly to move the first step height along the sub-scanning direction; The single-scan image data and the second feathered template are ANDed to obtain the second sub-single-scan image data; The printhead assembly is controlled to scan and dispense ink in the reverse direction of the main scanning direction based on the second sub-single scan image data.

6. The residence-type printing method based on different concentration curves according to claim 4, characterized in that, When the image height of the image to be printed along the sub-scanning direction is greater than or equal to the effective printing height, wherein the effective printing height is equal to the number of scans multiplied by the average effective height of a single printhead plus the first step height, the method further includes: After the printhead assembly completes the scanning and printing of the current image printing area according to the number of scans, it moves along the sub-scanning direction by a second step height to the next printing area; wherein, the second step height is equal to the effective printing height; The image data corresponding to the next printing area scanned by the printhead group each time is obtained and recorded as the next single scan image data; After controlling the printhead assembly to scan and dispense ink in the main scanning direction according to the next single scan image data and the first preset density curve, it moves the distance of the first step height in the sub-scanning direction, and then scans and dispenses ink in the reverse direction according to the next single scan image data and the second preset density curve.

7. A residence-type printing device based on different concentration curves, characterized in that, The device includes: The overlapping nozzle count acquisition module is used to obtain the number of overlapping nozzles in the nozzle splicing area of ​​the nozzle group; The module for obtaining and determining the average effective height of a single nozzle is used to determine the average effective height of a single nozzle based on the number of overlapping nozzles. The first step height acquisition module is used to acquire the first step height based on the average effective height of the single nozzle. A preset concentration curve determination module is used to determine a first preset concentration curve and a second preset concentration curve based on the first step height, wherein the second preset concentration curve is different from the first preset concentration curve; The single-scan image data acquisition module is used to acquire the image data of each scan of the nozzle group, which is denoted as single-scan image data. The printing module is used to control the printhead assembly to scan and dispense ink in the main scanning direction according to the single scan image data and the first preset density curve, then move the first step height distance in the secondary scanning direction perpendicular to the main scanning direction, and then scan and dispense ink in the reverse direction according to the single scan image data and the second preset density curve. The first preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height. Each interval includes a first sub-curve. Several first sub-curves constitute the first preset concentration curve. Except for the first first sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining first sub-curves gradually change from 0% to 100% or from 100% to 0%. The second preset concentration curve uses image height as the horizontal axis and concentration ratio as the vertical axis. The horizontal axis is divided into several intervals according to the first step height. Each interval includes a second sub-curve. Several second sub-curves constitute the second preset concentration curve. Except for the last second sub-curve, whose concentration ratio is 100%, the concentration ratios of the remaining second sub-curves gradually change from 0% to 100% or from 100% to 0%.

8. A residence-type printing device based on different concentration curves, characterized in that, include: At least one processor, at least one memory, and computer program instructions stored in the memory, which, when executed by the processor, implement the method as described in any one of claims 1-6.

9. A storage medium storing computer program instructions thereon, characterized in that, The method as described in any one of claims 1-6 is implemented when the computer program instructions are executed by the processor.

Images