CN114801487B - Method and system for eliminating printing image saw teeth - Google Patents
Method and system for eliminating printing image saw teeth Download PDFInfo
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- CN114801487B CN114801487B CN202210605782.6A CN202210605782A CN114801487B CN 114801487 B CN114801487 B CN 114801487B CN 202210605782 A CN202210605782 A CN 202210605782A CN 114801487 B CN114801487 B CN 114801487B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/075—Ink jet characterised by jet control for many-valued deflection
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/07—Ink jet characterised by jet control
- B41J2/11—Ink jet characterised by jet control for ink spray
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
Abstract
The invention discloses a method and a system for eliminating print image saw teeth, wherein the method comprises the following steps: s1, calculating the size of each pixel according to the resolution of a printing head, and calculating the height difference between adjacent ink drops in each group of ink drops printed on paper; s2, calculating a coordinate compensation value corresponding to each ink dot according to the size of each pixel and the height difference between adjacent ink drops in each group of ink drops printed on the paper; and S3, during rasterization, subtracting the corresponding coordinate compensation value from the sampling coordinate, and performing rounding to obtain the ink dot coordinate. The method and the system for eliminating the sawtooth of the printed image fully consider the offset characteristic of ink drops in the printing process, firstly calculate the coordinate compensation value of each ink dot, subtract the corresponding coordinate compensation value by using the sampling coordinate during rasterization, and obtain the coordinate of the ink dot by rounding. After rasterization is carried out, a plurality of pixel points in each group are arranged in a downward-inclined mode, the physical positions of ink drops are fully considered, and printed images can obtain better quality.
Description
Technical Field
The invention relates to the technical field of digital ink-jet printing, in particular to a method and a system for eliminating printing image saw teeth.
Background
There are two main types of print heads used in digital ink jet printing, namely thermal foaming and piezoelectric. The thermal foaming technique is to make ink generate bubbles by heating a nozzle and spray the bubbles onto a printing medium, and belongs to the high-temperature and high-pressure printing technique. The working principle is as follows: with thin film resistors, ink of less than 5 picoliters is heated instantaneously to over 300 ℃ in the ink ejection area, forming countless micro-bubbles which coalesce into large bubbles and expand at a very fast rate of less than 10 microseconds forcing ink drops to be ejected from the nozzles. The piezoelectric ink-jet printing technology is characterized by that a lot of small piezoelectric ceramics are placed near the nozzle of printing head, and under the action of voltage change at two ends the piezoelectric ceramics have the characteristics of bending deformation, when image information voltage is applied to the piezoelectric ceramic, the expansion vibration deformation of the piezoelectric ceramic changes along with the change of the image information voltage, and the ink in the nozzle is enabled to be uniformly and accurately ejected under the stable state of normal temperature and normal pressure.
Thermal bubble printing often has the advantages of many nozzles, small ink drops and high precision. Meanwhile, because a plurality of nozzles are arranged, the full spray cannot be carried out at one time, and the spray of all spray holes needs to be carried out for a plurality of times to complete the full spray at one time. And also because of the tendency of the ink drops on the paper to tilt downward during printing due to the movement of the print medium relative to the jets, as shown in figure 1.
Fig. 1 is a simulation of a printing process of a domestic thermal foaming printhead, which has 30720 nozzles, and needs to be divided into 32 batches to complete a full ejection, and each batch ejects 960 nozzles. Since the paper movement causes an offset of 8 μm between two adjacent ink droplets in the horizontal direction, an original horizontal straight line is formed by a plurality of small oblique lines inclined downwards, which affects the quality of the printed image.
Since there is a downward shift of at most 8 × 7=56 microns in the horizontal direction, exceeding 21 microns in the diameter of one droplet, this simple approach can be greatly improved by simply shifting the position of the portion of the pixel where the shift is severe to the position of the previous row, as shown in fig. 2.
The defect of fig. 1 is that the downward deviation of the pixel points on the printed image is relatively serious, and after simple optimization, the downward deviation effect is relatively better as seen in fig. 2, but the upward deviation and the downward deviation have certain amplitudes, the maximum upward deviation is 18 micrometers, and the maximum downward deviation is 14 micrometers.
Although the simple optimization method shown in fig. 1 to 2 is improved greatly, the simple optimization method shown in fig. 2 cannot completely solve the problem considering that 18 micrometers and 14 micrometers are large values relative to 21 micrometers of the ink droplet diameter. A more sophisticated method is needed to optimize the process.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for eliminating the jaggy of a printed image, which fully considers the offset characteristic of ink drops in the printing process and considers the physical positions of the ink drops in rasterization.
In order to solve the above problems, the present invention provides a method of removing jagging of a printed image, the method comprising the steps of:
s1, calculating the size of each pixel according to the resolution of a printing head, and calculating the height difference between adjacent ink drops in each group of ink drops printed on paper; the printing head comprises a plurality of printing units, nozzles in each printing unit are distributed on m columns, n nozzles in each column are arranged, m columns of ink drops printed on paper are divided into n groups, and m columns of ink drops in the same group are sequentially printed in a time sequence; m is more than or equal to 2; n is more than or equal to 1;
s2, calculating a coordinate compensation value corresponding to each ink dot according to the size of each pixel and the height difference between adjacent ink drops in each group of ink drops printed on the paper;
and S3, during rasterization, subtracting the corresponding coordinate compensation value from the sampling coordinate, and performing rounding to obtain the ink dot coordinate.
As a further improvement of the present invention, the size of each pixel calculated according to the resolution of the print head is:
wherein a x b is the resolution of the print head, i.e. a dots per inch in the horizontal direction and b dots per inch in the vertical direction; a and B are the size of each pixel in the horizontal direction and the vertical direction, respectively;
and calculating a height difference S between adjacent ones of each set of ink droplets printed on the paper using the following formula interval ：
S interval ＝V×T interval
Wherein V is the relative movement speed of the print head and the paper, T interval The time is printed for the interval between adjacent drops in each set of drops.
As a further improvement of the invention, the coordinate compensation value y corresponding to each ink dot Compensating for Comprises the following steps:
y compensating for ＝(x％m)×(-S interval /B)
Wherein, y Compensation For vertical compensation, x% m is x for m, which is the x-th drop in each group in time sequence.
As a further improvement of the present invention, the dot coordinates obtained by the step S3 are:
wherein (x) sample ,y sample ) Is a sampling coordinate; (x) i ,y i ) Obtaining the coordinates of the ink points;
meaning that the rounding is done up for x,
indicating rounding off x.
The invention also provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor implements the steps of any one of the above methods when executing the program.
The invention also provides a computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the steps of any of the methods described above.
The present invention also provides a system for eliminating jaggies of a printed image, comprising:
the first calculation module is used for calculating the size of each pixel according to the resolution of the printing head and calculating the height difference between adjacent ink drops in each group of ink drops printed on the paper; the printing head comprises a plurality of printing units, nozzles in each printing unit are distributed on m columns, n nozzles in each column are arranged, m columns of ink drops printed on paper are divided into n groups, and m columns of ink drops in the same group are sequentially printed in a time sequence; m is more than or equal to 2; n is more than or equal to 1;
the second calculation module is used for calculating a coordinate compensation value corresponding to each ink dot according to the size of each pixel and the height difference between adjacent ink drops in each group of ink drops printed on the paper;
and the compensation module is used for subtracting the corresponding coordinate compensation value from the sampling coordinate during rasterization and obtaining the ink dot coordinate by rounding.
As a further improvement of the present invention, the size of each pixel calculated according to the resolution of the print head is:
wherein a x b is the resolution of the print head, i.e. a dots per inch in the horizontal direction and b dots per inch in the vertical direction; a and B are the size of each pixel in the horizontal direction and the vertical direction, respectively;
and calculating a height difference S between adjacent ink droplets in each set of ink droplets printed on the paper using the following formula interval ：
S interval ＝V×T interval
Wherein V is the relative movement speed of the print head and the paper, T interval The time is printed for the interval between adjacent drops in each set of drops.
As a further improvement of the invention, the coordinate compensation value y corresponding to each ink dot Compensation Comprises the following steps:
y compensation ＝(x％m)×(-S interval /B)
Wherein, y Compensating for For vertical compensation, x% m is x for m, which is the x-th drop in each group in time sequence.
As a further improvement of the invention, the rounded ink dot coordinates are:
wherein (x) sample ,y sample ) Is a sampling coordinate; (x) i ,y i ) Obtaining the coordinates of the ink points;
meaning that the rounding is done up for x,
indicating rounding to x.
The invention has the beneficial effects that:
the method and the system for eliminating the sawtooth of the printed image fully consider the offset characteristic of ink drops in the printing process, firstly calculate the coordinate compensation value of each ink dot, subtract the corresponding coordinate compensation value by using the sampling coordinate during rasterization, and obtain the coordinate of the ink dot by rounding. After rasterization is carried out, a plurality of pixel points in each group are arranged in a downward-inclined mode, the physical positions of ink drops are fully considered, and printed images can obtain better quality.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented in accordance with the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the following preferred embodiments are described in detail with reference to the accompanying drawings.
Drawings
FIG. 1 is a prior art thermal foaming printhead printing process simulation;
FIG. 2 is a simulation of an optimized printing process of a prior art thermal foaming print head;
FIG. 3 is a schematic diagram of a prior art linear rasterization;
FIG. 4 is a schematic diagram of the present invention in view of linear rasterization of a printing process;
FIG. 5 is a schematic view of a nozzle of a printhead according to an embodiment of the invention;
FIG. 6 is a schematic illustration of dots of a printed image in an embodiment of the present invention;
FIG. 7 is a line segment path diagram according to an embodiment of the present invention;
FIG. 8 is a schematic line segment with sampling points in an embodiment of the present invention;
FIG. 9 is a schematic view of a straight line in an embodiment of the present invention;
FIG. 10 is a schematic illustration of a straight line sampling the x-axis in an embodiment of the present invention;
FIG. 11 is a schematic diagram of linear rasterization in an embodiment of the present invention.
Detailed Description
The present invention is further described below in conjunction with the following figures and specific examples so that those skilled in the art may better understand the present invention and practice it, but the examples are not intended to limit the present invention.
Example one
The preferred embodiment of the invention discloses a method for eliminating the saw teeth of a printed image, which comprises the following steps:
s1, calculating the size of each pixel according to the resolution of a printing head, and calculating the height difference between adjacent ink drops in each group of ink drops printed on paper; the printing head comprises a plurality of printing units, nozzles in each printing unit are distributed on m columns, n nozzles in each column are arranged, m columns of ink drops printed on paper are divided into n groups, and m columns of ink drops in the same group are sequentially printed in a time sequence; m is more than or equal to 2; n is more than or equal to 1.
Specifically, the size of each pixel calculated according to the resolution of the print head is:
wherein a x b is the resolution of the print head, i.e. a dots per inch in the horizontal direction and b dots per inch in the vertical direction; a and B are the dimensions of each pixel in the horizontal and vertical directions, respectively.
And calculating a height difference S between adjacent ones of each set of ink droplets printed on the paper using the following formula interval ：
S interval ＝V×T interval
Wherein V is the relative movement speed of the print head and the paper, T interval The time is printed for the interval between adjacent drops in each set of drops.
In one embodiment, taking a certain print head as an example, the resolution of the print head is 1200 × 600, that is, 1200 dots per inch in the horizontal direction and 600 dots per inch in the vertical direction, the size of each pixel printed on the paper can be calculated to be 21.167 μm × 42.333 μm, as follows:
1inch＝2.54cm＝0.0254m
0.0254m÷1200＝21.167μm
0.0254m÷600＝42.333μm
the print head consists of several units (units), each Unit having 32 nozzles distributed in 8 rows of 4 nozzles, the horizontal width being: 21.167 μm × 8=169.336 μm, vertical height: 42.333 μm × 32=1354.656 μm, the nozzle distribution of the printhead is schematically shown in fig. 5.
For a print head to eject ink once, which is called a latch, 32 nozzles per unit need to be ejected for 32 latch cycles, and only one nozzle works in each latch cycle, and these 32 latches are respectively latch 1 to latch32.
The ink droplets printed on the paper are printed in groups of 8 columns each, for a total of n groups, and the 8 columns in the same group are sequentially printed in time series.
With V =1.0m/s, T interval =8 μ s, it can be calculated:
S interval ＝V×T interval ＝1.0m/s×8μs＝8μm。
and S2, calculating a coordinate compensation value corresponding to each ink dot according to the size of each pixel and the height difference between adjacent ink drops in each group of ink drops printed on the paper.
Specifically, a coordinate compensation value y corresponding to each dot Compensation Comprises the following steps:
y compensation ＝(x％m)×(-S interval /B)
Wherein, y Compensating for For vertical compensation, x% m is x for m, which is the x-th drop in each group in time sequence.
In one embodiment, a schematic diagram of dots of a printed image is shown in FIG. 6. x is a radical of a fluorine atom 0 Represents x =0; x is the number of 1 Represents x =1; and so on. The coordinates of a dot are represented by (x, y), but (x, y) does not directly correspond to the actual position of the dot, and y needs to be compensated for. In the vertical direction:
1 dot =42.333 μm
And:
if the actual position of the ink dot (x, y) is obtained, y needs to be compensated, and when x =0, y needs to be compensated by 0; when x =1, y needs to be compensated by-0.189; when x =2, y needs to be compensated by-0.378; … …; when x =9, y needs to be compensated by 0; and so on.
Remember y Compensation Is compensated for y, then y Compensation The following formula is satisfied:
y compensating for ＝(x％8)×-0.189
The actual position of the dot (x, y) is: (x, y + y) Compensation )。
And S3, during rasterization, subtracting the corresponding coordinate compensation value from the sampling coordinate, and performing rounding to obtain the ink dot coordinate.
Specifically, the dot coordinates obtained by rounding are:
wherein (x) sample ,y sample ) Is a sampling coordinate; (x) i ,y i ) Obtaining the coordinates of the ink points;
meaning that the rounding is done up for x,
indicating rounding off x.
The process of rasterization is illustrated by drawing straight lines as an example. The pixel position of the straight line path can be determined from the geometric features of the straight line. The cartesian slope intercept equation for a straight line is:
y＝m·x+b
where m is the slope of the line and b is the outcome of the y-axis. Given the two end points (x) of the line segment shown in FIG. 7 0 ，y 0 ) And (x) end ，y end ) The intercept of the slopes m and y can be calculated as b:
b＝y 0 -m·x 0
for any given x increment δ x along a straight line, the corresponding y increment can be calculated as δ y:
δy＝m·δx
likewise, an x increment δ x corresponding to a specified δ y can be derived:
for a straight line with absolute value | m | <1, a smaller δ x can be set, and the corresponding δ y can be calculated; setting a smaller delta y for a straight line with a slope value | m | >1, and calculating the corresponding delta x; for a straight line with a slope m =1, δ x = δ y, δ x and δ y may be set.
In a raster system, line segments are drawn by pixels, the step sizes in the horizontal and vertical directions being limited by the pitch of the pixels. That is, the line segment must be sampled at discrete locations and the pixel closest to the line segment determined at each sampling location. As shown in fig. 8, the scan conversion process for a line segment and discrete sample point locations relative to the x-axis are given.
The specific steps of rasterization are as follows:
as shown in fig. 9, the equation for the straight line is y = mx + b.
(1) Judging the sampling direction
L m | <1, sample the x-axis; l m | >1 samples y; i m | =1 may sample both x and y.
(2) Sampling
According to a given start (x) 0 ,y 0 ) And end (x) end ,y end ) The sampling is done on the x-axis or y-axis. Taking sampling in the x direction as an example, assume x 0 ＝0，x end ＝10.5，x 0 And x end Comprises 11 sampling points, x =0, x =1, …, x =10, and the 11 sampling points are x sample0 ，x sample1 ，…x sample10 As shown in fig. 10.
(3) Calculating coordinates
The coordinates of the corresponding sample point are calculated according to the equation y = mx + b for the straight line. E.g., 2) of 11 sample points for sampling the x-axis, the calculated values of 11 y, i.e., y sample0 ，y sample1 ，…y sample10 And the coordinates of the 11 sampling points are (x) sample0 ,y sample0 ),(x sample1 ,y sample1 ),…,(x sample10 ,y sample10 )。
(4) Adjusting sampling coordinates to ink dot coordinates
In (3), the compensation in the y direction is subtracted from the sampling coordinate calculated according to the linear equation, and the coordinate (x) of the ink dot is obtained by rounding i ,y i ) Wherein:
wherein the content of the first and second substances,
meaning that the rounding is done up for x,
indicating rounding off x. Fig. 11 is the rasterization result for line y = mx + b.
As shown in fig. 3, a process of rasterizing a straight line in which pixels are arranged in horizontal and vertical directions is a general case.
As shown in fig. 4, the rasterization process is performed in consideration of the characteristic that the ink drops will be inclined downward during the printing process, and in the rasterization process, the pixels are not distributed according to a strict horizontal and vertical grid, but are arranged in a manner that the pixels are inclined downward by groups of 8 pixels. The physical placement of the ink drops is taken into account during the rasterization process so that the printed image can be of better quality.
Example two
The embodiment discloses an electronic device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to implement the steps of the method in the embodiment.
EXAMPLE III
The present embodiment discloses a computer-readable storage medium, on which a computer program is stored, which when executed by a processor implements the steps of the method described in the above embodiments.
Example four
The embodiment discloses a system for eliminating jaggies of a printed image, which comprises:
the first calculation module is used for calculating the size of each pixel according to the resolution of the printing head and calculating the height difference between adjacent ink drops in each group of ink drops printed on the paper; the printing head comprises a plurality of printing units, nozzles in each printing unit are distributed on m columns, n nozzles in each column are arranged, m columns of ink drops printed on paper are divided into n groups, and m columns of ink drops in the same group are sequentially printed in a time sequence; m is more than or equal to 2; n is more than or equal to 1;
the second calculation module is used for calculating a coordinate compensation value corresponding to each ink dot according to the size of each pixel and the height difference between adjacent ink drops in each group of ink drops printed on the paper;
and the compensation module is used for subtracting the corresponding coordinate compensation value from the sampling coordinate during rasterization and obtaining the ink dot coordinate by rounding.
Specifically, the size of each pixel calculated according to the resolution of the print head is:
wherein a x b is the resolution of the print head, i.e. a dots per inch in the horizontal direction and b dots per inch in the vertical direction; a and B are the size of each pixel in the horizontal direction and the vertical direction, respectively;
and calculating a height difference S between adjacent ink droplets in each set of ink droplets printed on the paper using the following formula interval ：
S interval ＝V×T interval
Wherein V is the relative movement speed of the print head and the paper, T interval The time is printed for the interval between adjacent drops in each set of drops.
Specifically, a coordinate compensation value y corresponding to each dot Compensation Comprises the following steps:
y compensation ＝(x％m)×(-S interval /B)
Wherein, y Compensation For vertical compensation, x% m is x for m, which is the x-th drop in each group in time sequence.
Specifically, the rounded dot coordinates are:
wherein (x) sample ,y sample ) Is a sampling coordinate; (x) i ,y i ) Obtaining the coordinates of the ink points;
meaning that the rounding is done up for x,
indicating rounding off x.
The system for eliminating jaggies of a printed image in the embodiment of the present invention is used to implement the foregoing method for eliminating jaggies of a printed image, and therefore, the detailed description of the system can be found in the previous embodiment section of the method for eliminating jaggies of a printed image, and therefore, the detailed description thereof can refer to the description of the corresponding above embodiment of the method, and will not be further described herein.
In addition, since the system for removing jagging of a printed image of the present embodiment is used to implement the aforementioned method for removing jagging of a printed image, the role thereof corresponds to that of the aforementioned method, and will not be described again here.
The above embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (6)
1. A method of deskewing a printed image, comprising the steps of:
s1, calculating the size of each pixel according to the resolution of a printing head, and calculating the height difference between adjacent ink drops in each group of ink drops printed on paper; the printing head comprises a plurality of printing units, nozzles in each printing unit are distributed on m columns, n nozzles in each column are arranged, m columns of ink drops printed on paper are divided into n groups, and m columns of ink drops in the same group are sequentially printed in a time sequence; m is more than or equal to 2; n is more than or equal to 1;
s2, calculating a coordinate compensation value corresponding to each ink dot according to the size of each pixel and the height difference between adjacent ink drops in each group of ink drops printed on the paper;
s3, during rasterization, subtracting the corresponding coordinate compensation value from the sampling coordinate, and performing rounding to obtain an ink dot coordinate;
the size of each pixel calculated according to the resolution of the print head is:
Wherein a x b is the resolution of the print head, i.e. a dots per inch in the horizontal direction and b dots per inch in the vertical direction; a and B are the size of each pixel in the horizontal direction and the vertical direction, respectively;
and calculating a height difference S between adjacent ink droplets in each set of ink droplets printed on the paper using the following formula interval ：
S interval ＝V×T interval
Wherein V is the relative movement speed of the print head and the paper, T interval Printing a time interval between adjacent drops in each set of drops;
coordinate compensation value y corresponding to each ink dot Compensation Comprises the following steps:
y compensation ＝(x％m)×(-S interval /B)
Wherein, y Compensation For vertical compensation, x% m is x for m, which is the x-th drop in each group in time sequence.
2. The method for jagging a printed image according to claim 1, wherein the coordinates of the dots obtained by the step S3 are set as follows:
wherein (x) sample ,y sample ) Is a sampling coordinate; (x) i ,y i ) Obtaining the coordinates of the ink points;
meaning that the rounding is done up for x,
indicating rounding off x.
3. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1-2 are implemented when the computer program is executed by the processor.
4. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method of any one of claims 1-2.
5. A system for deskewing a printed image, comprising:
the first calculation module is used for calculating the size of each pixel according to the resolution of the printing head and calculating the height difference between adjacent ink drops in each group of ink drops printed on the paper; the printing head comprises a plurality of printing units, nozzles in each printing unit are distributed on m columns, n nozzles in each column are arranged, m columns of ink drops printed on paper are divided into n groups, and m columns of ink drops in the same group are sequentially printed in a time sequence; m is more than or equal to 2; n is more than or equal to 1;
the second calculation module is used for calculating a coordinate compensation value corresponding to each ink dot according to the size of each pixel and the height difference between adjacent ink drops in each group of ink drops printed on the paper;
the compensation module is used for subtracting the corresponding coordinate compensation value from the sampling coordinate during rasterization and obtaining the ink dot coordinate by rounding;
the size of each pixel calculated according to the resolution of the print head is:
Wherein a x b is the resolution of the print head, i.e. a dots per inch in the horizontal direction and b dots per inch in the vertical direction; a and B are the size of each pixel in the horizontal direction and the vertical direction respectively;
and calculating a height difference S between adjacent ink droplets in each set of ink droplets printed on the paper using the following formula interval ：
S interval ＝V×T interval
Wherein V is the relative movement speed of the print head and the paper, T interval Printing a time interval between adjacent drops in each set of drops;
coordinate compensation value y corresponding to each ink dot Compensation Comprises the following steps:
y compensation ＝(x％m)×(-S interval /B)
Wherein, y Compensation For vertical compensation, x% m is x for m, which is the x-th drop in each group in time sequence.
6. The system for deskewing a printed image according to claim 5, wherein the rounded dot coordinates are:
wherein (x) sample ,y sample ) Is a sampling coordinate; (x) i ,y i ) Obtaining the coordinates of the ink points;
meaning that the rounding is done up for x,
indicating rounding off x.
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| JP2731908B2 (en) * | 1988-05-27 | 1998-03-25 | セイコーインスツルメンツ株式会社 | Printer driving method |
| JP3900896B2 (en) * | 2001-11-12 | 2007-04-04 | セイコーエプソン株式会社 | Printing to the end of the print media without soiling the platen |
| JP2006326913A (en) * | 2005-05-24 | 2006-12-07 | Ricoh Co Ltd | Image processing method, image forming apparatus and program |
| CN100509402C (en) * | 2005-07-08 | 2009-07-08 | 佳能株式会社 | Ink jet printing apparatus and ink jet printing method |
| JP5884259B2 (en) * | 2010-09-28 | 2016-03-15 | セイコーエプソン株式会社 | Printing device control method and printing device |
| WO2016015766A1 (en) * | 2014-07-31 | 2016-02-04 | Hewlett-Packard Development Company, L.P. | A method of printing and printer |
| CN111439032A (en) * | 2020-05-13 | 2020-07-24 | 苏州新锐发科技有限公司 | Ink jet print head, ink jet printing apparatus, and ink jet printing method |
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