CN116080287A

CN116080287A - Color difference correction method, device, equipment and medium for scanning printer

Info

Publication number: CN116080287A
Application number: CN202310157413.XA
Authority: CN
Inventors: 叶小仁
Original assignee: Shenzhen Zhiren Image Technology Co ltd
Current assignee: Shenzhen Zhiren Image Technology Co ltd
Priority date: 2023-02-23
Filing date: 2023-02-23
Publication date: 2023-05-09

Abstract

The invention discloses a chromatic aberration correction method, device and equipment for a scanning printer and a storage medium, and relates to the fields of printing and printers. The color difference correction method of the scanning printer comprises the following steps: rendering the rendering object by using the first color characteristic file to obtain a first rendering image G1; rendering the same rendering object by using the second color characteristic file to obtain a second rendering image G2; when the scanning printer prints the rendered image, the forward printing process acquires pixels from the first rendered image G1, and the reverse printing process acquires pixels from the second rendered image G2. The invention can effectively solve the color difference problem caused by different printing color sequences of the scanning printer due to different printing directions.

Description

Color difference correction method, device, equipment and medium for scanning printer

Technical Field

The present invention relates to the field of printers, and in particular, to a method, an apparatus, a device, and a medium for correcting chromatic aberration of a scanning printer.

Background

With the wide application of piezoceramic nozzles, the printing field is developed from the traditional offset printing technology to the digital ink-jet technology, and under the current internet electronic commerce background, the short-plate printing service is rapidly increased, and the printing industry is changed from the traditional manufacturing to the intelligent manufacturing.

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

Compared with a single-pass printer, the scanning printer has the advantage of low cost, and is widely applied to various industries of national economy at present.

In the prior art, a digital raster image processor RIP (Raster Image Process) is used to rasterize a document to be printed and output the document to a printer for outputting. In the RIP processing process, the output of the printer is assumed to be uniform in all directions, but there is a deviation in actual conditions, for example, the printing sequence of the scanning printer 4 is KCMY from left to right, and when the printer performs back-pass printing, the printing color sequence is YMCK, and as the ink is rapidly dried on the printing stock, the colors are not fully fused, so that the difference exists between the reflectivity of the ink layer and the color difference exists between the forward-pass printing and the back-pass printing. As shown in fig. 3, the printing artwork is shown in fig. 2.

In general, the scanning type multicolor printer based on other technologies inevitably has the problem of the printing color sequence, and as long as the situation of uneven pigment mixing exists, the problem of chromatic aberration of going-through and return printing inevitably occurs.

The above technical problem, due to the color mixing problem involved, cannot be solved by adjusting the linearization of the outgoing and return print image data, otherwise new color differences will be introduced.

In order to solve the technical problems, the invention provides a method, a device, equipment and a medium for correcting chromatic aberration of a scanning printer. The invention has the advantages of convenient installation and use and low cost, and can effectively solve the color difference problem caused by different printing color sequences of the scanning printer due to different printing directions.

Disclosure of Invention

The invention aims to solve the technical problem of providing a method, a device, equipment and a medium for correcting chromatic aberration of a scanning printer, which are used for solving the chromatic aberration problem caused by different printing color sequences of the scanning printer due to different printing directions.

For convenience of description, the invention assumes that the scanning printer is in a left-right scanning mode, and assumes that the left-to-right printing process is forward printing or forward scanning, whereas the right-to-left printing process is reverse printing or return scanning. Changing the scan direction, forward and reverse, forward and return direction definitions does not affect the understanding of the present invention, for example, the right-to-left printing process is referred to as forward printing.

First aspect: in order to solve the chromatic aberration problem of a scanning printer, the invention provides a chromatic aberration correction method of the scanning printer, which comprises the following steps:

s1, rendering a rendering object by using a first color characteristic file to obtain a first rendering image G1;

s2, rendering the same rendering object by using a second color characteristic file to obtain a second rendering image G2;

s3, when the scanning printer prints the rendering image, the forward printing process obtains pixels from the first rendering image G1, and the reverse printing process obtains pixels from the second rendering image G2.

The color profile includes, but is not limited to, ICC (ICC Profile) file, ICM file.

The rendered image bit depth is not limited.

Preferably, the first rendered image G1 and the second rendered image G2 are combined into an image G to be printed;

the merging method comprises the following steps:

acquiring a position set P of forward printing pixels P (x, y) and a position set Q of reverse printing pixels Q (x, y) when the scanning printer prints the rendering graph;

and (3) extracting pixels from the first rendering image G1 according to the set P, extracting pixels from the second rendering image G2 according to the set Q, and combining the two to obtain an image G=F (G1, P) +F (G2, Q) to be printed.

Wherein F (Gn, X) is defined as follows:

y (X, Y) =gn (X, Y) { X, Y } belongs to X

Y (X, Y) =0 { X, Y } does not belong to X

Y (X, Y) is the value of the function F (Gn, X) at (X, Y); x, y are pixel coordinates; n=1, 2; x=p, Q.

Second aspect: in order to solve the chromatic aberration problem of the scanning printer, the invention also provides a raster image processor (Raster Image Processor, RIP), which is characterized in that different color characteristic files are provided for the same scanning printer device, so as to realize the chromatic aberration correction method of the scanning printer according to the first aspect.

The raster image processor uses the first color characteristic file to render the rendering object to obtain the first rendering image G1 for the same document to be printed, then uses the second color characteristic file to render the same rendering object to obtain the second rendering image G2, the raster image processor adds a merging module newly, the merging module determines the scanning printing outgoing distance and the return stroke pixel position according to the scanning printing parameters and the algorithm, or obtains the outgoing Cheng Dayin pixel from the first rendering image according to the outgoing distance and the return stroke pixel position information provided by the scanning printer, obtains the return stroke printing pixel from the second rendering image, synthesizes the outgoing distance pixel set and the return stroke pixel set to obtain the complete image to be printed, and the detailed scheme is described in the embodiment 2.

Third aspect: in order to solve the chromatic aberration problem of the scanning printer, the invention provides a scanning printer, which is characterized in that the chromatic aberration correction is realized by using the chromatic aberration correction method of the scanning printer. The scanning printer supports a minimum of 2 color profiles for color management of the same print job.

Preferably, the first rendered image G1 and the second rendered image G2 according to the first aspect are input by the scan printer, and the scan printer selects pixels of the first rendered image G1 or the second rendered image G2 according to a scan printing direction to print.

The print job of the scanning printer includes a rendered image 1 and a rendered image 2. The rendering image 1 is obtained by rendering a document to be printed by a first color characteristic file, and the rendering image 2 is obtained by rendering the same document to be printed by a second color characteristic file. When the print controller 1002 prints a job, it acquires pixel data from the rendered image 1 when it determines forward printing, and acquires print pixel data from the rendered image 2 when it determines reverse printing, according to the current operating state of the motion control unit 1005, and the print controller 1002 acquires the pixel data and then constructs firing data to be sent to the head control board for printing.

The scanning printer with the color difference correction function is characterized in that in a print job, two rendering images are provided for the same rendering object, and the prior art is one rendering image.

Fourth aspect: in order to solve the chromatic aberration problem of the scanning printer, the invention also provides a chromatic aberration correction device of the scanning printer, which is characterized by comprising a memory and a processor; the memory is used for storing a computer program; the processor is configured to implement the scanning printer color difference correction method according to the first aspect when executing the computer program.

Fifth aspect: in order to solve the chromatic aberration problem of the scanning printer, the invention also provides a computer readable storage medium, which is characterized in that the storage medium stores a computer program, and when the computer program is executed by a processor, the chromatic aberration correction method of the scanning printer is realized.

By adopting the invention, the color difference problem of the scanning printer caused by different printing color sequences can be effectively solved.

Drawings

Fig. 1 is a flowchart of a method for correcting chromatic aberration of a scanning printer according to the present invention.

Fig. 2 is a color difference test chart according to the present invention.

Fig. 3 is a schematic diagram of a printer output of a scanning printer according to the present invention without color difference correction.

Fig. 4 is a schematic diagram showing a process of synthesizing a color difference correction chart of a scanning printer according to embodiment 1 of the present invention.

Fig. 5 is a schematic printing diagram of a scanner printer according to embodiment 1 of the present invention.

Fig. 6 is a schematic view of the feathering printing of the scanning printer according to embodiment 1 of the present invention.

Fig. 7 is a schematic block diagram of a raster image processor with a color difference correction function of a scanner printer according to embodiment 2 of the present invention.

Fig. 8 is a schematic block diagram of another raster image processor with a color difference correction function of a scanner printer according to embodiment 2 of the present invention.

Fig. 9 is a schematic block diagram of another raster image processor with a color difference correction function of a scanner printer according to embodiment 2 of the present invention.

Fig. 10 is a schematic block diagram of a scanner printer having a color difference correction function according to embodiment 3 of the present invention.

Fig. 11 is a schematic block diagram of a chromatic aberration correction apparatus for a scanner printer according to embodiment 4 of the present invention.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely configured to illustrate the invention and are not configured to limit 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 present invention will be described with respect to a scanning inkjet printer as an example of such a color difference solution, and those skilled in the art will appreciate that the present invention is equally applicable to scanning printers including, but not limited to, laser, thermal bubble printing techniques.

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

Example 1: color difference correction method for scanning printer

The printer belongs to a color reduction image copying system, and during the spectrum process of an ink reflection light source, the ink absorbs certain components in the spectrum of the light source, and the residual spectrum is reflected to form a color feel. There are a number of factors that affect the color gamut of a printer, and the ink amount of ink is one factor that affects the color of a printer, with other factors remaining unchanged, and in general, the greater the ink amount, the higher the color saturation of the print.

Specifically, as shown in fig. 1, the invention provides a method for correcting chromatic aberration of a scanning printer, which comprises the following steps:

because the scanning printer prints the in-process, the shower nozzle structure is installed fixedly, and in scanning printing going way and return stroke direction, the printing colour order is different, therefore the ink layer stacks the order differently, because the printing ink drying time is short, has dried under the not yet abundant fusion condition of printing ink, causes different printing ink to stack the order and has different effects to the reflection of spectrum, causes different colour sensation. To eliminate chromatic aberration caused by this problem, separate color profiles are used for the outbound and inbound passes to manage color, rather than a single color profile for the entire web as in the prior art.

The color profile and associated rendering process are prior art and are not described in detail herein.

S3, when the scanning printer prints the rendering graph, the forward printing process obtains pixels from the first rendering image G1, and the reverse printing process obtains pixels from the second rendering image G2.

According to the scanning printing parameters and the algorithm, determining the scanning printing forward-going and return-stroke pixel positions, obtaining Cheng Dayin pixels from the first rendered image G1, obtaining return-stroke printing pixels from the second rendered image G2, and integrating the forward-stroke pixel set and the return-stroke pixel set to obtain a complete image to be printed. The scan printing parameters and algorithms are prior art and are not described in detail herein.

the merging method comprises the following steps:

Wherein F (Gn, X) is defined as follows:

y (X, Y) =gn (X, Y) { X, Y } belongs to X

Y (X, Y) =0 { X, Y } does not belong to X

Preferably, the scan print information is provided by the scan printer, that is, the print direction information of each pixel in the printed swath is provided by the scan printer, denoted by a matrix M, M (x, y) denotes a swath pixel direction mask to be printed, and, for example, when M (x, y) =0xff, denotes acquiring pixel data from the first rendered image G1, and when M (x, y) =0, denotes acquiring pixel data from the second rendered image G2, the image merging process may be expressed as follows:

G(x,y)=G1(x,y)&M(x,y) | G2(x,y)&(~M(x,y))

wherein, & is bit and operation, | is bit OR operation, & is bit inversion operation.

Fig. 4 is a schematic diagram of an image merging method.

In general, G1, G2, G have the same wide, high, and resolution parameters, and in the case of performing color management independently by using different color profiles without departing from the core concept of the present invention, i.e., going-through and going-back, G1, G2, G are allowed to have different wide, high, and resolution parameters, and in the process of merging images or directly printing images, pixels are acquired from the first rendered image G1 or the second rendered image G2 according to motion states.

Fig. 5 is a schematic diagram showing color difference processing image merging of a scanning printer without the feathering function. When the printer head prints from left to right, black pixels in the drawing are selected to print, and when the printer head prints from right to left, white pixels in the drawing are selected to print. Wherein, black pixels are obtained from a first rendered image G1 obtained by controlling a first color characteristic file, and white pixels are obtained from a second rendered image G2 obtained by controlling a second color characteristic file.

Fig. 6 is a schematic diagram showing color difference processing image merging of a scanning printer having a feathering function. Some pixels of the feathering area 602 are obtained from the first rendered image G1, and the rest are obtained from the second rendered image G2, and the obtaining method is still determined according to the printing direction.

Example 2: grating image processor with color difference correction function

Fig. 7 shows an embodiment of a raster image processor with color difference correction according to the present invention. The raster image processor includes a first color management module 701, a first PDF/PS interpreter 702, a first rendering module 703, a second color management module 706, a second PDF/PS interpreter 704, a second rendering module 705, a merge module 707, a linearization module 708, and a screening module 709. Wherein,,

a first color management module 701, a second color management module 706: completing a PDF/PS document interpretation function, and generating a displayList display object list;

a first rendering module 703, a second rendering module 705: completing the rendering work of the displayist to form a rasterized image output, wherein the first rendering module 703 uses the color profile 1 to render and the second rendering module 705 uses the color profile 2 to render;

a first color management module 701, a second color management module 706: responsible for color management in the rendering process, including ICC standard color management;

combining module 707: the merging module determines the forward and return pixel positions of the scanning print according to the scanning print parameters and the algorithm, or obtains Cheng Dayin pixels from the first rendered image generated by the first rendering module 703 according to the forward and return pixel position information provided by the scanning printer, obtains return print pixels from the second rendered image generated by the second rendering module 705, synthesizes the forward pixel set and the return pixel set to obtain a complete image to be printed, and then completes linearization and screening processing to print the complete image to the printer.

Linearization module 708: finishing the linearization conversion of the rasterized image;

screening module 709: halftone or grayscale image processing of the continuous tone image is completed to form the final printable image.

Other working principles and processes of each functional module of the raster image processor are prior art and are not described in detail herein.

The merging module of the embodiment is arranged at different positions, so that different implementation modes exist, and the specific different implementation modes are all within the scope of the invention. 2 different implementations are listed here for illustration.

As shown in fig. 8, the color management module 801 is configured with a color profile 1 and a color profile 2, which process print jobs as follows:

step 1: the rendering module 803 renders the job to be printed by using the color characteristic file 1, and outputs a rendered image 1 which is cached in the merging module 804;

step 2: the rendering module 803 renders the print job again using the color profile 2, which is output as a rendered image 2;

step 3: the merging module 804 determines the scanning printing forward and backward pixel positions according to the scanning printing parameters and algorithms for the rendered image 1 and the rendered image 2, or obtains forward printing pixels from the rendered image 1 generated by the rendering module 803 according to the forward and backward pixel position information provided by the scanning printer, obtains backward printing pixels from the rendered image 2 generated by the rendering module 803, and synthesizes the forward pixel set and the backward pixel set to obtain a complete image to be printed;

step 4: linearizing;

step 5: and (5) screening treatment.

As shown in fig. 9, the merge module is located after the screening module. The first rendering module 903 uses the color profile 1 to render, linearize and screen the job to be printed to obtain the half-modulated raster image data 1, and the second rendering module 905 uses the color profile 2 to render, linearize and screen the job to obtain the half-modulated raster image data 2, and the merging module 911 determines the scan print outgoing and return pixel positions according to the scan print parameters and algorithms, or obtains the outgoing Cheng Dayin pixels from the half-modulated raster image data 1 according to the outgoing and return pixel position information provided by the scan printer, obtains the return print pixels from the half-modulated raster image data 2, and synthesizes the outgoing pixel set and the return pixel set to obtain the complete image to be printed.

Example 3: scanning printer with chromatic aberration correction function

Fig. 10 shows an embodiment of a scanning printer with color difference correction according to the present invention. The scanner printer is composed of a print controller 1002, 1 or more head boards 1003, 1 or more heads 1004, and a motion control unit 1005.

Wherein,,

1. the print controller 1002 is a main control unit of the system, and has the main functions of:

(1) Managing and scheduling the printing operation to complete the construction of ignition data, the management of a motion control unit, the communication of a spray head plate and the like;

(2) Managing system equipment;

(3) Managing system states;

(4) And (5) managing system faults and alarms.

2. The shower head plate 1003 has the main functions of:

(1) Receive firing data for print controller 1002;

(2) Adapting the hardware interface of the spray head 1004;

(3) And monitoring the working state of the spray head.

3. The motion control unit 1005 realizes motion control of the X, Y, Z axis of the head.

The color difference correction process of the scanning printer in the embodiment is as follows:

the print job of the printer includes a rendered image 1 and a rendered image 2. The rendering image 1 is obtained by rendering a document to be printed by a first color characteristic file, and the rendering image 2 is obtained by rendering the same document to be printed by a second color characteristic file. When the print controller 1002 prints a job, it acquires pixel data from the rendered image 1 when it determines forward printing, and acquires print pixel data from the rendered image 2 when it determines reverse printing, according to the current operating state of the motion control unit 1005, and the print controller 1002 acquires the pixel data and then constructs firing data to be sent to the head control board for printing.

The embodiment of the scanning printer with the color difference correction function is characterized in that in the printing operation, two rendering images are provided for the same rendering object, and the prior art is one rendering image.

This embodiment is essentially implemented by placing the merge module of embodiment 1 on the scan printer controller side.

Example 4: color difference correction device of scanning printer

FIG. 11 is a schematic diagram of an embodiment of a color difference correction apparatus for a scanning printer. The scanning printer color difference correction apparatus may include a processor 1101 and a memory 1102 storing computer program instructions. In particular, the processor 1101 may comprise a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits that implement embodiments of the present invention.

Memory 1102 may include mass storage for data or instructions. By way of example, and not limitation, memory 1102 may comprise a Hard Disk Drive (HDD), floppy Disk Drive, flash memory, optical Disk, magneto-optical Disk, magnetic tape, or universal serial bus (Universal Serial Bus, USB) Drive, or a combination of two or more of the foregoing. Memory 1102 may include removable or non-removable (or fixed) media where appropriate. Memory 1102 may be internal or external to the data processing apparatus, where appropriate. In a particular embodiment, the memory 1102 is a non-volatile solid state memory. In a particular embodiment, the memory 1102 includes Read Only Memory (ROM). 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, where appropriate.

The processor 1101 implements any one of the scanning printer color difference correction processing methods of the above-described embodiments by reading and executing the computer program instructions stored in the memory 1102.

In one example, the scanning printer color difference correction apparatus may further include a communication interface 1103 and a bus 1104. As shown in fig. 11, the processor 1101, the memory 1102, and the communication interface 1103 are connected to each other by a bus 1104 and perform communication with each other.

The communication interface 1103 is mainly used for implementing communication between each module, device, unit and/or apparatus in the embodiment of the present invention.

Bus 1104 includes hardware, software, or both, coupling the components of the device to each other. By way of example, and not limitation, the buses 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 the above. Bus 1104 may include one or more buses, where appropriate. Although embodiments of the invention have been described and illustrated with respect to a particular bus, the invention contemplates any suitable bus or interconnect.

Example 5A color difference correction storage Medium for a scanning Printer

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

The functional blocks shown in the above-described structural block diagrams may be implemented in 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, a plug-in, a 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 over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include, but are not limited to, electronic circuits, semiconductor memory devices, ROMs, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, network links, radio Frequency (RF) links. The code segments may be downloaded via computer networks such as the internet, intranets, etc.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and 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 modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.

Claims

1. A method for correcting chromatic aberration of a scanning printer, the method comprising:

rendering the rendering object by using the first color characteristic file to obtain a first rendering image G1;

rendering the same rendering object by using the second color characteristic file to obtain a second rendering image G2;

when the scanning printer prints the rendering image, the forward printing process obtains pixels from the first rendering image G1, and the reverse printing process obtains pixels from the second rendering image G2; wherein,,

the color profile includes, but is not limited to, ICC (ICC Profile) file, ICM file;

the rendered image bit depth is not limited.

2. The method for correcting chromatic aberration of a scan printer according to claim 1, wherein,

the merging method comprises the following steps:

taking out pixels according to a set P from the first rendering image G1, taking out pixels according to a set Q from the second rendering image G2, and combining the pixels to obtain an image G=F (G1, P) +F (G2, Q) to be printed;

wherein F (Gn, X) is defined as follows:

y (X, Y) =gn (X, Y) { X, Y } belongs to X

Y (X, Y) =0 { X, Y } does not belong to X

3. A raster image processor, wherein different color profiles are provided for the same scanning printer device, implementing the scanning printer color difference correction method as claimed in any one of claims 1-2.

4. A scanning printer, characterized in that the chromatic aberration correction is achieved using the chromatic aberration correction method according to any one of claims 1-2.

5. A scanning printer according to claim 4, wherein the scanning printer inputs the first rendered image G1 and the second rendered image G2 according to claim 1, and wherein the scanning printer selects the first rendered image G1 or the second rendered image G2 pixels for printing according to a scanning printing direction.

6. The color difference correction device of the scanning printer is characterized by comprising a memory and a processor; the memory is used for storing a computer program; the processor being configured to implement the color difference correction method according to any one of claims 1-2 when executing the computer program.

7. A computer-readable storage medium, characterized in that the storage medium has stored thereon a computer program which, when executed by a processor, implements the chromatic aberration correction method according to any one of claims 1-2.