CN114571860A

CN114571860A - Printing head array chromatic aberration correction method, device, equipment and medium

Info

Publication number: CN114571860A
Application number: CN202210211140.8A
Authority: CN
Inventors: 叶小仁
Original assignee: Shenzhen Zhiren Image Technology Co ltd
Current assignee: Shenzhen Zhiren Image Technology Co ltd
Priority date: 2022-03-05
Filing date: 2022-03-05
Publication date: 2022-06-03

Abstract

The invention discloses a method, a device and equipment for correcting chromatic aberration of a printing head array and a storage medium, and relates to the field of printing and printers. The printing head array chromatic aberration correction method comprises the following steps: acquiring a pixel p (x, y) in an image to be printed, wherein (x, y) is a pixel coordinate; determining a printing head to which a pixel p (x, y) to be printed belongs according to the printing head array jet hole configuration data and the optional printing job configuration data; acquiring the determined linearization data of the printing head, and completing linearization conversion of the pixel p (x, y) according to the linearization data to obtain g (x, y); saving g (x, y) to the destination storage space. The invention can effectively solve the problem of chromatic aberration of the array printer caused by the difference of the printing heads.

Description

Printing head array chromatic aberration correction method, device, equipment and medium

Technical Field

The invention relates to the field of printers, in particular to a method, a device, equipment and a medium for correcting chromatic aberration of a printing head array.

Background

With the wide application of the piezoelectric ceramic spray head, the printing field is developed from the traditional offset printing technology to the digital ink-jet technology, under the current internet e-commerce background, the short-cut printing business is rapidly increased, and the printing industry is switched from traditional manufacturing to intelligent manufacturing.

Digital ink jet printing or digital ink jet printing can be divided into two broad categories by the mode of operation: scanning (multi-pass) and single-pass (single-pass/one-pass). The scanning printing mode is that a printing stock is fixed, and the image output is realized by moving a printing head; the single-pass printing mode is that the printing head is fixed and the image output is realized by moving the printing stock.

In order to increase the printing speed and the productivity, it is usually necessary to combine a plurality of print heads into an array to realize the printing output of a certain color, hereinafter, such a printer is referred to as an array printer, and an array formed by a plurality of print heads printing a certain color is referred to as a print head array of the color or simply an array, and in the case of a color array printer, it means that there are print head arrays of a plurality of colors. As shown in fig. 1, a typical array type color printer is composed of four color head arrays 101 of cyan C, magenta M, yellow Y, and black K, each of which is formed by a plurality of heads 102 being spliced. Since the ink drop of the ink jet print head is very small, reaching the picoliter (1 pL =10 e-12L) order, many factors can affect the ink jet amount of the jet orifice, while the prior art generally adopts global linearization and ICC color management, so that the array composed of multiple nozzles generates the defect of inconsistent color of the output image, as shown in fig. 3, and the original print image is shown in fig. 2.

In order to solve the technical problem, different nozzles in an array can be used as different printers, ICC files are manufactured for each nozzle, and the DeviceLink technology of ICC is used for solving the problem of color consistency.

In order to solve the above technical problems, the present invention provides a method and an apparatus for correcting chromatic aberration of a printhead array. The invention has the advantages of convenient installation and use and low cost, and can effectively solve the problem of chromatic aberration of the printing head of the array printer.

Disclosure of Invention

The invention aims to provide a method, a device, equipment and a medium for correcting chromatic aberration of a printing head array, which are used for solving the chromatic aberration problem of the printing head array.

In a first aspect: in order to solve the problem of chromatic aberration of a printing head array, the invention provides a chromatic aberration correction method of the printing head array, which comprises the following steps:

acquiring a pixel p (x, y) in an image to be printed, wherein (x, y) is a pixel coordinate;

determining a printing head of a pixel p (x, y) to be printed according to the printing head array jet orifice configuration data and the optional printing job configuration data, namely, the printing head is responsible for printing the pixel;

acquiring the determined linearization data of the printing head, and completing linearization conversion of the pixel p (x, y) according to the linearization data to obtain g (x, y);

saving g (x, y) to a destination storage space;

wherein the content of the first and second substances,

the jet orifice is a device for printing one pixel on the printing head;

the print head comprises a physical print head or a logical print head, wherein the logical print head refers to a logical conceptual print head consisting of one or more physical print heads or a logically divided print head formed by combining one or more jet orifices in one or more physical print heads.

Preferably, the nozzle hole configuration data includes, but is not limited to, a nozzle hole table, where the nozzle hole table includes nozzle hole numbers and print head numbers corresponding to the nozzle hole numbers, the nozzle hole numbers refer to numbers of nozzle holes in the print head array in the direction of the arrangement of the nozzle holes, and the print head numbers refer to numbers of the print head array to which the nozzle holes corresponding to the nozzle hole numbers belong.

Preferably, the print job configuration data includes, but is not limited to, any one or combination of a plurality of parameters of print job orifice position offset, print direction, pass number, feathering parameters,

wherein the content of the first and second substances,

the printing operation jet hole position offset refers to a jet hole number corresponding to a pixel p (0,0) corresponding to the origin of coordinates of an image to be printed;

the printing direction refers to transverse printing and longitudinal printing, the transverse printing refers to that the arrangement direction of the jet holes is longitudinally parallel to the image to be printed, the movement direction of the printing head array or the printing stock is transversely parallel to the image to be printed, the longitudinal printing refers to that the arrangement direction of the jet holes is transversely parallel to the image to be printed, and the movement direction of the printing head array or the printing stock is longitudinally parallel to the image to be printed;

the pass number refers to the number of times the print head array needs to pass over a certain area when the print head array prints an image of the area;

the feathering parameters include, but are not limited to, a feathering height, which refers to the number of pixels overlapped between two passes, and a feathering template, which refers to which of the two passes is used to determine which of the two passes is used to print the overlapped pixels, thereby determining the print head that prints the pixels.

Preferably, the method for determining the print head to which the pixel p (x, y) to be printed belongs according to the print head array jet orifice configuration data and the optional print job configuration data comprises the following steps:

when the printing direction parameter is horizontal printing, determining a printing head to which the pixel p (x, y) to be printed belongs according to PhID = Nozle 2Phs (offset + y);

when the printing direction parameter is longitudinal printing, determining a printing head to which the pixel p (x, y) to be printed belongs according to PhID = Nozle 2Phs (offset + x);

wherein the content of the first and second substances,

PhID is the number of the printing head to which the pixel p (x, y) to be printed belongs;

nozle 2Phs is an orifice table;

the offset is the offset of the position of the jet hole of the printing operation, and is 0 when the offset of the position of the jet hole of the printing operation is not provided;

x is the pixel abscissa and y is the pixel ordinate.

Preferably, the linearization data acquisition method for the print head includes:

the first method comprises the following steps: obtaining linearization data for the print head directly from configuration data, the print head linearization data comprising a print head linearization conversion look-up table;

or:

the second method comprises the following steps:

acquiring linearization measurement data of all printing heads in the same-color printing head array, selecting the printing head with the minimum color saturation as a reference printing head, and calculating linearization conversion tables by using the color saturation of the reference printing head as a limit by other printing heads;

or:

the third method comprises the following steps: any combination of the first method, second method;

wherein the content of the first and second substances,

the linearization conversion look-up table is used for linearization conversion.

Preferably, the method for acquiring linearization measurement data of all print heads in the same-color print head array, selecting the print head with the smallest color saturation as a reference print head, and calculating the linearization conversion table by using the color saturation of the reference print head as a limit by other print heads comprises the following steps:

the fourth method: acquiring linearization measurement data of all printing heads under the same-color printing head array from configuration data, calculating an ink quantity-reflectivity curve of each printing head, selecting a point, of which the reflectivity does not decrease along with the increase of the ink quantity, in the curve as the minimum reflectivity Rmin of the printing head, wherein the corresponding ink quantity is Imax, selecting the printing head with the maximum Rmin as a reference printing head, reversely obtaining the ink quantity Imax corresponding to the Rmin reflectivity on the ink quantity-reflectivity curve of the printing head by other printing heads according to the Rmin of the reference printing head, and calculating linearization conversion lookup tables of each printing head according to the respective Imax;

or:

the fifth method comprises the following steps: obtaining linearization measurement data of all printing heads under the same color printing head array from configuration data, calculating an ink quantity-reflectivity curve of each printing head, selecting a point of which the reflectivity does not decrease along with the increase of the ink quantity in the curve as a minimum reflectivity Rmin of the printing head, wherein the corresponding ink quantity is Imax, obtaining a maximum ink quantity limit L of the printing head from the configuration data, determining the maximum available ink quantity of the printing head according to T = min (Imax, L), obtaining the corresponding reflectivity Rtmin of the printing head from the ink quantity-reflectivity curve of the printing head again according to the maximum available ink quantity T of the printing head, selecting the printing head with the maximum Rtmin in the color printing head array as a reference printing head, taking the Rtmin of the printing head as the minimum available reflectivity Rumin of the whole printing head array, and obtaining the ink quantity Umax corresponding to the Rumin reflectivity reversely by the other printing heads on the ink quantity-reflectivity curve of the printing head according to the Rumin of the reference printing head, each printing head calculates a linear conversion lookup table thereof by using each Umax;

or:

the sixth method: any combination of the fourth and fifth methods;

wherein the content of the first and second substances,

the ink volume-reflectance curve may be replaced with a dot area ratio-reflectance curve, and correspondingly, the ink volume may be replaced with a dot area ratio.

In a second aspect: in order to solve the problem of chromatic aberration of the print head array, the invention further provides a Raster Image Processor (RIP), which is characterized in that different linearization data are provided for 2 or more print heads, or different linearization data are provided for 2 or more orifices, so as to realize the chromatic aberration correction method of the print head array according to the first aspect.

In a third aspect: in order to solve the problem of chromatic aberration of the printing head array, the invention also provides an array printer which is characterized in that the array is a printing head array consisting of 2 or more than 2 printing heads, and printing of a certain color is completed through the printing head array; the print head includes but is not limited to a piezoelectric print head, a thermal foaming print head, a thermal print head, a laser print head; the array printer provides different linearization data for 2 or more than 2 printing heads, or provides different linearization data for 2 or more than 2 jet orifices, and the method for correcting the chromatic aberration of the printing head array is used for realizing the chromatic aberration correction of the printing head array; the laser printing head comprises a laser module, a selenium drum, carbon powder and an auxiliary mechanism thereof.

In a fourth aspect: in order to solve the problem of chromatic aberration of the printing head array, the invention also provides a chromatic aberration correction device of the printing head array, which is characterized by comprising a memory and a processor; the memory for storing a computer program; the processor is configured to implement the method for correcting chromatic aberration of a printhead array according to the first aspect when executing the computer program.

In a fifth aspect: to solve the problem of the chromatic aberration of the print head array, the invention further provides a computer-readable storage medium, wherein the storage medium stores a computer program, and when the computer program is executed by a processor, the method for correcting the chromatic aberration of the print head array according to the first aspect is implemented.

The invention can effectively solve the problem of chromatic aberration of the array printer caused by printing head difference.

Drawings

Fig. 1 is a schematic block diagram of a typical array printer to which the present invention relates.

Fig. 2 is an original drawing for color difference test according to the present invention.

FIG. 3 is a schematic diagram of the output of the printer without color difference correction in the array printer according to the present invention.

Fig. 4 is a flowchart of a method for correcting chromatic aberration of a printhead array according to embodiment 1 of the present invention.

Fig. 5 is a schematic view of lateral printing of the printhead array according to embodiment 1 of the present invention.

Fig. 6 is a schematic view of longitudinal printing of the printhead array according to embodiment 1 of the present invention.

Fig. 7 is a schematic view of the nozzle linearization correction of embodiment 1 of the present invention.

FIG. 8 is a schematic diagram showing the principle of chromatic aberration correction of an ink amount-reflectance curve of a print head according to embodiment 1 of the present invention.

FIG. 9 is a schematic diagram showing the correction principle of chromatic aberration of an ink amount-reflectance curve under the limitation of the ink amount of the printhead according to embodiment 1 of the present invention.

FIG. 10 is a schematic diagram of the input/output curves of different print heads after the chromatic aberration correction linearization according to embodiment 1 of the present invention.

Fig. 11 is a schematic block diagram of a raster image processor having a chromatic aberration correction function according to embodiment 2 of the present invention.

Fig. 12 is a schematic block diagram of an array printer having a color difference correction function according to embodiment 3 of the present invention.

Fig. 13 is a schematic block diagram of a print head array chromatic aberration correction apparatus according to embodiment 4 of the present invention.

Detailed Description

Features of various aspects and exemplary embodiments of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details.

The printing head comprises a physical printing head or a logical printing head, wherein the logical printing head refers to a logical conceptual printing head consisting of one or more physical printing heads or a logically divided printing head formed by combining one or more jet orifices in one or more physical printing heads.

The physical printing head comprises but is not limited to a piezoelectric printing head, a thermal foaming printing head, a thermal printing head and a laser printing head, wherein the laser printing head consists of a laser module, a selenium drum, carbon powder and an auxiliary mechanism thereof.

The orifice is a device for printing one pixel on the printhead.

Specific examples of the present invention are described in detail below.

Example 1: printing head array chromatic aberration correction method

The printer belongs to a color-reducing image reproduction system, and in the process of reflecting the spectrum of a light source by ink, the ink absorbs certain components in the spectrum of the light source, and the residual spectrum is reflected to form colors. There are many factors that affect the printer's color gamut, and the amount of ink is one factor that affects the printer's color gamut, with other factors remaining constant, typically the greater the amount of ink, the more saturated the color printed. In the printing system formed by the printing head array, the ink output amount is different due to the manufacturing difference of the printing heads or the tiny difference of the working parameters, and the problem of printing color difference is caused.

Specifically, as shown in fig. 4, the present invention provides a method for correcting chromatic aberration of a printhead array, the method comprising the following steps:

s1, acquiring a pixel p (x, y) in an image to be printed, wherein (x, y) is a pixel coordinate.

S2, determining the printing head of the pixel p (x, y) to be printed according to the configuration data of the jet holes of the printing head array and the optional printing job configuration data, namely, the printing head is responsible for printing the pixel.

The injection hole table can be represented by the following table:

TABLE 1 spray orifice table

Number of spray hole	0	1	2	3	4	…	Nmax
								Print head numbering	0	0	0	0	0	…	PhNum-1

In the above table, Nmax denotes the maximum orifice number in the head array, and PhNum is the number of heads. The number of the jet holes corresponding to the print head does not necessarily need to be continuous, and for example, the situation that the jet holes are alternately arranged at the splicing position of the print head can occur. As configured in the following table:

TABLE 2 alternate arrangement of orifices

Number of spray hole

…

k-2

k-1

k

k+1

k+2

…

Print head numbering

…

p-1

p

p-1

p

…

In the above table, k is the number of the nozzle hole, and p is the number of the nozzle.

In addition, the orifices of different physical print heads can also use the same print head number to represent the same logic print head in the orifice table; orifices in the same physical printhead may also belong to different logical printheads.

Preferably, the print job configuration data includes, but is not limited to, any one or combination of parameters of print job orifice position offset, print direction, pass number, feathering parameters. Wherein the content of the first and second substances,

FIG. 5 is a schematic diagram of lateral printing by the printhead array. In the figure, the print heads 501 are arranged in the longitudinal direction, and the direction of arrangement of the orifices 502 coincides with the direction of arrangement of the print heads 501. And a coordinate system is established by taking the first pixel 504 at the upper left corner as a coordinate origin of the image to be printed 507, and the serial number of the pixel where the coordinate of the origin of the image to be printed is aligned with the jet orifice 503 determined by the jet orifice position offset parameter of the printing job. When printing, each jet orifice in the print head array is responsible for printing one line of pixels or part of pixels in an image to be printed, and the print head array or a printing stock moves transversely to complete printing of one line or multiple lines of images.

FIG. 6 is a schematic diagram of longitudinal printing by the printhead array. In the figure, the print head 601 array is arranged in the lateral direction, and the arrangement direction of the orifices 602 coincides with the arrangement direction of the print heads 601. A coordinate system is established by taking the first pixel 604 at the upper left corner of the image to be printed 605 as a coordinate origin, and the serial number of the pixel where the coordinate of the origin of the image to be printed is aligned with the jet hole 603 in the jet hole array is determined by the position offset parameter of the jet hole of the printing job. When printing, each jet orifice in the print head array is responsible for printing a column of pixels or part of pixels in an image to be printed, and the print head array or a printing stock moves longitudinally to complete printing of one or more lines of images.

when the printing direction parameter is longitudinal printing, determining a printing head to which a pixel p (x, y) to be printed belongs according to PhID = noise 2Phs (offset + x);

wherein, the first and the second end of the pipe are connected with each other,

nozle 2Phs is an orifice table;

x is the pixel abscissa;

y is the pixel ordinate.

The method for determining the printing head to which the pixel to be printed belongs can be used for a single-pass printer.

For a scanning printer, the method of determining the print head to which the pixel to be printed belongs can be expressed as:

PhID = f(x, y, Nozzle2Phs, offset, dir, pass, user)

wherein:

x and y are position coordinates of the pixel in the image to be printed;

nozle 2Phs is a spray orifice table;

dir is a printing direction and comprises transverse printing and longitudinal printing;

the pass number is used in a scanning printing mode, and the parameter is pass =1 in a single pass printing mode;

the user parameter is a user-defined parameter that affects the calculation of the print head to which the pixel belongs, including but not limited to a feathering parameter;

f () determines the calculation process for the pixel p (x, y) that belongs to the print head. The calculation process of the print head to which the pixels to be printed belong according to these parameters can be implemented by the prior art and will not be described in detail here.

And S3, acquiring the determined linearization data of the printing head, and finishing linearization conversion of the pixel p (x, y) according to the linearization data to obtain g (x, y).

The ink has a non-linear output characteristic due to the spreading effect on paper or other substrates. To obtain good printing results, it is often necessary to make a linearization correction to the print head. Fig. 7 is a schematic diagram of the print head linearization principle, in which the output curve 701 before print head linearization is corrected by the print head linearization correction curve 703 to obtain a print head linearization output curve 702, which is generally close to a straight line.

In this embodiment, the implementation of the print head linearization conversion process is described by taking the way of the linearization lookup table as an example.

the method for obtaining the lookup table comprises but is not limited to directly manually compiling a linearization conversion lookup table through experience, or obtaining the lookup table through fine tuning on the basis of the existing linearization conversion lookup table;

or:

the second method comprises the following steps: acquiring linearization measurement data of all printing heads in the same-color printing head array, selecting the printing head with the minimum color saturation as a reference printing head, and calculating linearization conversion tables by using the color saturation of the reference printing head as a limit by other printing heads;

or:

wherein the linearization conversion look-up table is used for linearization conversion.

The present embodiment uses the following equation to determine the linearized translation look-up table:

I=f^-1(Rmax-(c/255)*(Rmax-Rmin))/Umax*255

wherein:

c is an input color value, and c is more than or equal to 0 and less than or equal to 255;

rmin is the minimum available reflectivity of the nozzle array;

the Rmax is the reflectivity when the ink amount is 0, namely the reflectivity of the printing stock to the light source;

f^-1() The function is an inverse function of ink quantity-reflectivity, namely, the ink quantity is calculated through the reflectivity;

umax is the maximum available ink volume, and Umax may be different for different heads, and when there is no ink volume limit, Umax = Imax, which is the maximum ink volume for the printhead.

the fourth method comprises the following steps: the method comprises the steps of obtaining linearization measurement data of all printing heads under the same-color printing head array from configuration data, calculating an ink quantity-reflectivity curve of each printing head, selecting a point, of which the reflectivity does not decrease along with the increase of the ink quantity, in the curve as the minimum reflectivity Rmin of the printing head, wherein the corresponding ink quantity is Imax, selecting the printing head with the maximum Rmin as a reference printing head, reversely obtaining the ink quantity Imax corresponding to the Rmin reflectivity on the ink quantity-reflectivity curve of the printing head by other printing heads according to the Rmin of the reference printing head, and calculating linearization conversion lookup tables of the printing heads according to the respective Imax.

Fig. 8 illustrates a schematic diagram of the chromatic aberration correction linearization of a print head array consisting of 3 print heads, in which the spectral reflectance curves of the print heads a, b, c are shown by

curves

801, 802, 803, and the respective maximum ink amounts are Imaxa, Imaxb, Imaxc, according to the foregoing method, because the minimum reflectance of the print head a is the largest, the reference print head of the print head a is selected, namely Rmin = Rmina, Umaxa = Imaxa, and the minimum reflectance of the reference print head a is used as the minimum reflectance of the present print head of the other print heads, as shown by Rmin in the diagram, the maximum available ink amounts Umaxb, Umaxc of the print heads b, c can be found from the respective curves. Substituting Umaxa, Umaxb and Umaxc into the above formula can obtain the linear conversion lookup table of the printing heads a, b and c.

Fig. 10 is a graph illustrating the linearization charts of the print heads a, b, c, and it can be seen that the print heads b, c achieve the same spectral reflectance of the print head a with smaller output under the same input condition, i.e. the gray scale corresponding to the color is the same.

Or:

the fifth method comprises the following steps: obtaining linearization measurement data of all printing heads under the same color printing head array from configuration data, calculating an ink quantity-reflectivity curve of each printing head, selecting a point of which the reflectivity does not decrease along with the increase of the ink quantity in the curve as a minimum reflectivity Rmin of the printing head, wherein the corresponding ink quantity is Imax, obtaining a maximum ink quantity limit L of the printing head from the configuration data, determining the maximum available ink quantity of the printing head according to T = min (Imax, L), obtaining the corresponding reflectivity Rtmin of the printing head from the ink quantity-reflectivity curve of the printing head again according to the maximum available ink quantity T of the printing head, selecting the printing head with the maximum Rtmin in the color printing head array as a reference printing head, taking the Rtmin of the printing head as the minimum available reflectivity Rumin of the whole printing head array, and obtaining the ink quantity Umax corresponding to the Rumin reflectivity reversely by the other printing heads on the ink quantity-reflectivity curve of the printing head according to the Rumin of the reference printing head, each print head computes its linearized translation look-up table at its respective Umax.

Fig. 9 depicts a schematic diagram of the chromatic aberration correction linearization of a print head array consisting of 3 print heads, in which the spectral reflectance curves of the print heads a, b, c are shown by curves 901, 902, 903, the respective maximum ink amounts are Imaxa, Imaxb, Imaxc, the minimum reflectances corresponding to the respective print heads are Rmina, Rminb, Rminc, the maximum ink amount limits La, Lb = Imaxb, Lc = Imaxc of the respective print heads are obtained from the configuration data, the maximum available ink amounts of the print heads a, b, c are Ta = min (Imaxa, Lb) = La, Tb = La (Imaxb, Lb) = Imaxb, Tc = Imaxc, Lc) = Imaxc based on T = min (Imax, L), the reflectance curves are again obtained from the spectral reflectance curves, the reflectances of the respective maximum available ink amounts Ta = Ta, Tb, Tc are min = inffa, rta = rmanfa, rmamifa, rma, rmanc, wherein the spectral reflectance curves are a functions, rma, Ta, rma, Ta, rma, Ta, rma, Ta, rma, Ta, rma, the print head with the largest usable reflectance among all the print heads, i.e., Rmin = max (Rtmina, Rtminb, rtmnc) = Rtmina, is selected, so print head a is selected as the reference print head, i.e., Umaxa = Ta, and the other print heads have the smallest usable reflectance of the reference print head a as the smallest usable reflectance of the present print head, as shown by Rmin in the figure, and the largest usable ink amounts Umaxb, Umaxc of print heads b, c can be reversely found by the respective curves. Substituting Umaxa, Umaxb and Umaxc into the above-mentioned linearization table calculation formula to obtain the linearization conversion lookup tables of the printing heads a, b and c.

Or:

the sixth method: any combination of the fourth and fifth methods.

Wherein the content of the first and second substances,

the ink volume-reflectance curve can be replaced by a dot area ratio-reflectance curve, with the same effect. Correspondingly, the ink amount may be replaced by the dot area ratio, and the conversion of ink amount to dot area ratio may be represented by:

I=A/100*Imax

where I is the ink volume, A is the dot area ratio, and Imax is the maximum ink volume, or maximum available ink volume under ink volume constraints.

And S4, saving g (x, y) to a target storage space.

The linearized conversion result g (x, y) of the pixel p (x, y) of the image to be printed, which has undergone the color difference correction process, is stored in a destination storage space to be subjected to subsequent processes such as halftone processing, organization of print head firing data, and the like, which are prior art and will not be described in detail herein.

Example 2: raster image processor with chromatic aberration correction function

The invention also provides a raster image processor with the chromatic aberration correction function. As shown in fig. 11, the raster image processor includes a PDF/PS interpreter 1101, a rendering module 1102, a color management module 1103, a linearization module 1104, and a screening module 1105. Wherein the content of the first and second substances,

the PDF/PS interpreter 1101 completes a PDF/PS document interpretation function, and generates a DisplayList display object list;

the rendering module 1102 completes rendering work of the DisplayList to form rasterized image output;

the color management module 1103 is responsible for color management in the rendering process, including ICC standard color management;

the linearization module 1104 completes the linearization conversion of the rasterized image;

the screening module 1105 performs halftone or grayscale image processing of the continuous tone image to form the final printable image.

In this embodiment, the chromatic aberration correction is implemented by implementing any one of the aforementioned print head array chromatic aberration correction methods in the linearization module 1104. Other operation principles and processes of the functional blocks of the raster image processor are known in the art and will not be described in detail herein.

Example 3: array printer

The invention also provides an embodiment of the array printer with the color difference correction function. This embodiment describes an embodiment of the array printer with a piezo ceramic head as an example. As shown in fig. 12, the apparatus includes a printer controller 1201, a RIP server 1202, a LAN (Local Access Network) switch 1203, a head control board 1204, and a head 1205.

The main functions of each unit in this embodiment are described as follows:

the printer controller 1201: the printer controller 1201 is responsible for management control of the entire printer, including system initialization, job scheduling, print management, status management, device management, and fault management functions.

RIP server 1202: the RIP server 1202 is used to perform rasterization processing, color management, and the like of a document to be printed. In this embodiment, the RIP server further comprises a device for performing the color difference correction method for the print head array, and performs the color difference correction between the plurality of nozzles in the present array printer.

LAN switch 1203: LAN switch 1203 is used for communication message transmission between units in the system.

The nozzle control plate 1204: the nozzle control board 1204 is used for completing nozzle print job management, construction and driving of print ignition data, nozzle initialization, nozzle state monitoring and the like under the board card.

The spray head 1205: the printing head array is composed of at least 2 or more than 2 nozzles to jointly complete the printing output of a certain color. In this embodiment, there are 4 groups of print head arrays, and the print output of C, M, Y, K4 colors is completed separately.

The embodiment of the array printer apparatus is characterized in that the print head array formed by at least 2 or more than 2 nozzles is used in the apparatus to realize the printout of one color, and the RIP server 1102 includes the method for correcting the color difference of the print head array.

It should be added that, it should be understood by those skilled in the art that the embodiment only uses an RIP server as an example to implement how the array printer uses the array chromatic aberration correction method provided by the present invention, and by changing a module in which the array chromatic aberration correction method provided by the present invention is implemented, it should be considered that the scope of the present invention includes, but is not limited to, using the printer controller 1201 and the nozzle control board 1204 to implement the array chromatic aberration correction method provided by the present invention.

Example 4: printing head array chromatic aberration correction device

Fig. 13 shows an embodiment of a printhead array chromatic aberration correction apparatus. The print head array chromatic aberration correction apparatus may include a processor 1301 and a memory 1302 storing computer program instructions. In particular, the processor 1301 may include a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or may be configured as one or more Integrated circuits implementing embodiments of the present invention.

Memory 1302 may include mass storage for data or instructions. By way of example, and not limitation, memory 1302 may include a Hard Disk Drive (HDD), a floppy Disk Drive, flash memory, an optical Disk, a magneto-optical Disk, tape, or a Universal Serial Bus (USB) Drive or a combination of two or more of these. Memory 1302 may include removable or non-removable (or fixed) media, where appropriate. Memory 1302 may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory 1302 is non-volatile solid-state memory. In a particular embodiment, memory 1302 includes Read Only Memory (ROM). Where appropriate, the ROM may be mask-programmed ROM, Programmable ROM (PROM), Erasable PROM (EPROM), Electrically Erasable PROM (EEPROM), electrically rewritable ROM (EAROM), or flash memory or a combination of two or more of these.

The processor 1301 realizes any one of the print head array chromatic aberration correction processing methods in the above embodiments by reading and executing computer program instructions stored in the memory 1302.

In one example, the print head array chromatic aberration correction apparatus may further include a communication interface 1303 and a bus 1304. As shown in fig. 13, the processor 1301, the memory 1302, and the communication interface 1303 are connected via a bus 1304 to complete communication therebetween.

The communication interface 1303 is mainly used to implement communication between modules, apparatuses, units and/or devices in the embodiment of the present invention.

The bus 1304 includes hardware, software, or both to couple the devices' components to each other. By way of example, and not limitation, a bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hypertransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel 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 bus or a combination of two or more of these. Bus 1304 may include one or more buses, where appropriate. Although specific buses have been described and shown in the embodiments of the invention, any suitable buses or interconnects are contemplated by the invention.

Embodiment 5A print head array chromatic aberration correction storage Medium

In combination with the method for processing chromatic aberration correction of a printhead array in the above embodiments, embodiments of the present invention may be implemented by providing a computer-readable storage medium. The computer readable storage medium having stored thereon computer program instructions; the computer program instructions, when executed by a processor, implement any of the printhead array chromatic aberration correction processing methods of the above embodiments.

The functional blocks shown in the above-described structural block diagrams may be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, plug-in, function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine-readable medium or transmitted by a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" may include any medium that can store or transfer information. Examples of a machine-readable medium include, but are not limited to, electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy diskettes, CD-ROMs, optical disks, hard disks, fiber-optic media, network links, and Radio Frequency (RF) links. The code segments may be downloaded via computer networks such as the internet, intranet, etc.

Although the present invention has been described in detail with reference to the embodiments, it should be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the claims.

Claims

1. A method of printhead array chromatic aberration correction, the method comprising:

saving g (x, y) to a destination storage space;

wherein the content of the first and second substances,

the jet orifice is a device for printing one pixel on the printing head;

2. The printhead array chromatic aberration correction method of claim 1,

the nozzle hole configuration data includes, but is not limited to, a nozzle hole table, where the nozzle hole table includes nozzle hole numbers and print head numbers corresponding to the nozzle hole numbers, the nozzle hole numbers refer to numbers of nozzle holes in a print head array in the direction of the arrangement of the nozzle holes, and the print head numbers refer to numbers of the print head array to which the nozzle holes corresponding to the nozzle hole numbers belong.

3. The printhead array chromatic aberration correction method of claim 1,

the print job configuration data includes, but is not limited to, any one or combination of a plurality of parameters of print job orifice position offset, printing direction, pass number and feathering parameter,

wherein the content of the first and second substances,

4. The printhead array chromatic aberration correction method of claim 3,

the method for determining the print head of the pixel p (x, y) to be printed according to the print head array jet orifice configuration data and the optional print job configuration data comprises the following steps:

nozle 2Phs is an orifice table;

x is the pixel abscissa;

y is the pixel ordinate.

5. The printhead array chromatic aberration correction method of claim 1,

the linearization data acquisition method of the printing head comprises the following steps:

or:

the second method comprises the following steps:

or:

6. The printhead array chromatic aberration correction method of claim 5,

the method for acquiring the linearization measurement data of all print heads in the same-color print head array, selecting the print head with the minimum color saturation as a reference print head, and calculating the linearization conversion table by using the color saturation of the reference print head as a limit by other print heads comprises the following steps:

or:

the sixth method: any combination of the fourth and fifth methods;

wherein the ink volume-reflectance curve may be replaced with a dot area ratio-reflectance curve, and correspondingly, the ink volume may be replaced with a dot area ratio.

7. A raster image processor, wherein different linearization data are provided for 2 or more print heads, or 2 or more orifices, implementing the method of chromatic aberration correction for a print head array as claimed in any one of claims 1 to 6.

8. An array printer is characterized in that the array is a printing head array consisting of 2 or more than 2 printing heads to finish printing of a certain color; the print head includes but is not limited to a piezoelectric print head, a thermal foaming print head, a thermal print head, a laser print head; the array printer provides different linearization data for 2 or more than 2 print heads, or provides different linearization data for 2 or more than 2 jet orifices, and realizes the chromatic aberration correction of the print head array by using the print head array chromatic aberration correction method of any one of claims 1-6; the laser printing head comprises a laser module, a selenium drum, carbon powder and an auxiliary mechanism thereof.

9. A printing head array chromatic aberration correcting device is characterized by comprising a memory and a processor; the memory for storing a computer program; the processor, when executing the computer program, implements the printhead array chromatic aberration correction method of any of claims 1-6.

10. A computer-readable storage medium, having stored thereon a computer program which, when executed by a processor, implements the printhead array chromatic aberration correction method of any one of claims 1-6.