KR102667348B1 - An apparatus and method for printing a digital image in the printing system - Google Patents

Abstract

According to an embodiment of the present invention, a device for printing a digital image in a printing system analyzes multiple colors in an overlapping area of a large image to determine whether an important color representing the most used color exists among representative colors. A printing terminal that checks and, if the important color exists as a result of the confirmation, generates first printing information including density information of the important color and density information of representative colors excluding the important color, and transmits it to the digital printer. ; and receiving the first printing information from the printing terminal, printing the area excluding the overlapping area in the first segment image of the large image on the fabric using the first printing information based on FM mode, and printing the FM mode on the fabric. Based on the mode, the density of the identified important colors is changed from the density of the representative colors according to a predetermined ratio to print the overlapped area of the first split image, and the fabric on which the first split image is printed is overlapped. Retreating to the starting position of the area, and printing the overlapping area of the second split image of the large image by changing the density of the identified important colors based on the FM mode to that of the representative colors according to the ratio, and the digital printer for printing an area excluding the overlapping area in the second split image based on the FM mode.

Description

An apparatus and method for printing a digital image in the printing system}

The present invention relates to printing systems, and more particularly to an apparatus and method for printing digital images in a printing system.

A method of printing small images taken with a mobile phone or digital camera (for example, images of everyday life such as portraits or scenery taken while traveling) on photo paper or certain printing paper is often done using a small personal or office printer. It is common to print them individually. However, when continuously repeatedly printing multiple sheets of printed matter such as publications or very large images such as signs or advertising text, it is impossible to use a home or office printer, so offset printing, Use industrial printing methods such as gravure printing or digital printing.

Offset printing is a method of printing a printing plate using a computer and attaching the resulting CTP (Computer to Plate) plate to a printing press. Gravure printing is a method of making a concave surface of a metal (copper plate) and transferring ink into the concave area to the printed object. Digital printing is a method of printing printing images stored as digital files directly using computer-operated printing equipment without a physical printing medium such as CTP or copper plate.

Meanwhile, digital printing technology prints digital-based (e.g., mostly computer-generated) image files into various materials (e.g., paper, film (PVC, PET, etc.) or aluminum) and a certain thickness (e.g. , 10 to 250 microns), it can be printed directly on the surface of media (fabric) with a thickness of 10 to 250 microns, so it can be used not only on traditional paper prints such as flyers or posters, but also on the surface of various small and medium-sized flexible packaging containers including vinyl pouches, shrink films, labels, and in-molds. Labels or banners, banners, shoulder straps, signs, POP (Point of Purchase: An image or phrase that guides the user to the price or characteristics of a product, promotional sale information, event information, etc. at a supermarket, store, or event venue, which can be used to purchase goods or services, etc. It is possible to quickly print various types of advertisements that meet the various needs of the orderer (product advertisements made at the point of view) and a wide variety of very large, small quantity advertisements. Inevitably, digital printing technology can also be applied to industries that require large-scale printing of interior sheets such as wallpaper, flooring, and furniture that require large-scale printing. It can also be applied to industries that need to print large quantities of interior sheets such as wallpaper, flooring, and furniture, which inevitably require large-scale printing.

These digital printers roll the printing fabric into a roll on one side, hang it on an unwinder roller, and then continuously unwind it in one direction so that the printing fabric passes through a certain printing engine section, thereby reducing the length of the printing fabric. Roll-to-roll printing method in which printed content (images, etc.) of a predetermined unit length is repeatedly and continuously output along a direction, and the printed fabric is continuously wound in a roll form on the other side. At this time, the supply roller and take-up roller are continuously unwound and wound in one direction without stopping while the wound printing fabric is unwound from one side to the other (in this case, the fabric is unwound and wound by multiple direction changing rollers). , it is generally configured to pass through a predetermined roller set mechanism consisting of a tension adjustment roller, a drive roller, a transfer (supply) roller, a cooling roller, etc.), the fabric passes through the printing engine unit at a certain section in the process of passing through the printing engine unit. It is configured so that the direction of movement can be changed locally or intermittently, either forward or reverse, by means of a movable mechanism.

Meanwhile, when the length of the large image is longer than the length of one sheet of fabric, the digital printer divides the large image into first and second split images and then places the divided first and second split images on a plurality of fabrics, respectively. Print. However, in this case, the stitching line (hereinafter referred to as 'SL'), which is a connection outline, is prominently revealed at the connection position between the end of the preceding first split image and the beginning of the subsequent second split image, so that the finished print is damaged. There was a problem that the printing quality deteriorated.

For example, as shown in FIG. 1, when a large print 101 in which the length (L) of the unit image is larger than the outer circumference length (R) of the drum of the digital printer is output, the digital printer prints the large print 101 as the first It can be divided into a split image 103 and a second split image 105 and printed. In this case, the stitching line SL between the end of the first split image 103 and the beginning of the second split image 105 may be clearly displayed.

Therefore, the need for a method to solve these problems has emerged.

One embodiment of the present invention proposes an apparatus and method for removing stitching lines that occur when dividing and printing a large image in a printing system.

Additionally, an embodiment of the present invention proposes an apparatus and method for removing stitching lines by overlapping and printing portions of a plurality of split images in a printing system.

Additionally, an embodiment of the present invention proposes an apparatus and method for removing stitching lines by adjusting the density of representative colors for overlapping areas of overlapping segmented images in a printing system.

According to an embodiment of the present invention, a device for printing a digital image in a printing system analyzes multiple colors in an overlapping area of a large image to determine whether an important color representing the most used color exists among representative colors. A printing terminal that checks and, if the important color exists as a result of the confirmation, generates first printing information including density information of the important color and density information of representative colors excluding the important color, and transmits it to the digital printer. ; And receiving the first printing information from the printing terminal, printing the area excluding the overlapping area in the first segment image of the large image on the fabric using the first printing information based on FM mode, and printing the FM mode on the fabric. Based on the mode, the density of the identified important colors is changed from the density of the representative colors according to a predetermined ratio to print the overlapped area of the first split image, and the fabric on which the first split image is printed is overlapped. Retreating to the starting position of the area, and printing the overlapping area of the second split image of the large image by changing the density of the identified important colors based on the FM mode to that of the representative colors according to the ratio, and the digital printer for printing an area excluding the overlapping area in the second split image based on the FM mode.

According to another embodiment of the present invention, a method of printing a digital image in a printing system includes a printing terminal analyzing a plurality of colors in an overlapping area of a large image to determine an important color representing the most used color among representative colors. A process of checking whether the important color exists, and as a result of the confirmation, if the important color exists, first printing information including density information of the important color and density information of representative colors excluding the important color is generated to produce a digital printer. A process of transmitting, the digital printer, receiving the first printing information from the printing terminal, the digital printer, using the first printing information based on FM mode, to create a first split image of the large image In the process of printing the area excluding the overlapping area on the fabric, the digital printer changes the density of the identified important color based on the FM mode to the density of the representative colors according to a predetermined ratio to divide the first division. A process of printing the overlapping area of the image, the digital printer, a process of retracting the fabric on which the first split image is printed to the starting position of the overlapping area, the digital printer, the confirmed based on the FM mode A process of printing the overlapping area of a second divided image of the large image by changing the density of an important color compared to the density of the representative colors according to the ratio, and the digital printer performing the second division based on the FM mode. It includes a process of printing an area of the image excluding the overlapping area.

One embodiment of the present invention can eliminate stitching lines that occur when dividing and printing a large image in a printing system.

In addition, in one embodiment of the present invention, the stitching line can be removed by overlapping and printing portions of a plurality of split images in a printing system.

Additionally, in an embodiment of the present invention, a stitching line can be removed by adjusting the density of a representative color for an overlapping area of overlapping segmented images in a printing system.

In addition, the effects that can be obtained or expected due to the embodiments of the present invention will be disclosed directly or implicitly in the detailed description of the embodiments of the present invention. That is, various effects expected according to embodiments of the present invention will be disclosed in the detailed description to be described later.

1 is a diagram illustrating a large image including a conventional stitching line.
Figure 2 is a configuration diagram of a printing system according to an embodiment of the present invention.
Figure 3 is a block diagram of a printing terminal according to an embodiment of the present invention.
Figure 4 is a block diagram of a digital printing press according to an embodiment of the present invention.
Figure 5 is a diagram of printing a large image in a digital printer according to the first embodiment of the present invention.
Figure 6 is a graph showing the density of important colors in the overlapping area of a large image according to an embodiment of the present invention.
Figure 7 is a diagram showing characteristics of FM mode according to an embodiment of the present invention.
Figure 8 is an exemplary diagram of weighting the density of representative colors in a digital printing press according to an embodiment of the present invention.
Figure 9 is a diagram of printing a large image in a digital printer according to a second embodiment of the present invention.
Figure 10 is a diagram illustrating multiple gradient shapes according to an embodiment of the present invention.
11A to 11C are diagrams illustrating a procedure for printing a large image in a printing device according to an embodiment of the present invention.
Figure 12 is a flowchart of printing a large image in a printing system according to an embodiment of the present invention.

The terms used in this specification will be briefly explained, and the present invention will be described in detail.

The terms used in the embodiments of the present invention are general terms that are currently widely used as much as possible while considering the function in the present invention, but this may vary depending on the intention or precedent of a person working in the art, the emergence of new technology, etc. . In addition, in certain cases, there are terms arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the description of the relevant invention. Therefore, the terms used in the present invention should be defined based on the meaning of the term and the overall content of the present invention, rather than simply the name of the term.

Embodiments of the present invention can be modified in various ways and have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the scope to specific embodiments, and should be understood to include all transformations, equivalents, and substitutes included in the spirit and technical scope of the invention. In describing the embodiments, if it is determined that a detailed description of related known technology may obscure the point, the detailed description will be omitted.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. Terms are used only to distinguish one component from another.

Singular expressions include plural expressions unless the context clearly dictates otherwise. In this application, terms such as “comprise” or “consist of” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are intended to indicate the presence of one or more other It should be understood that this does not exclude in advance the presence or addition of features, numbers, steps, operations, components, parts, or combinations thereof.

In an embodiment of the present invention, a 'module' or 'unit' performs at least one function or operation, and may be implemented as hardware or software, or as a combination of hardware and software. In addition, a plurality of 'modules' or a plurality of 'units' are integrated into at least one module and implemented with at least one processor (not shown), except for 'modules' or 'units' that need to be implemented with specific hardware. It can be.

In an embodiment of the present invention, when a part is said to be “connected” to another part, this means not only when it is “directly connected” but also when it is “electrically connected” with another element in between. Also includes. Additionally, when a part is said to “include” a certain component, this means that it may further include other components, rather than excluding other components, unless specifically stated to the contrary.

Below, with reference to the attached drawings, embodiments of the present invention will be described in detail so that those skilled in the art can easily implement it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts unrelated to the description are omitted, and similar parts are given similar reference numerals throughout the specification.

Figure 2 is a configuration diagram of a printing system according to an embodiment of the present invention.

Referring to FIG. 2, the printing system includes a printing terminal 201 and a digital printer 203.

Looking at each component, the printing terminal 201 checks whether important colors exist in the overlapping area of the large image in order to print the large image to prevent stitching lines from occurring.

For example, the overlapping area may indicate a pre-designated overlapping area in a plurality of split images so that stitching lines do not occur between the plurality of prints even if the digital printer 203 divides and prints a large image on a plurality of fabrics. . For example, representative colors may include cyan, magenta, yellow, and black. For example, the critical color may represent the color with the highest frequency in the overlapping area.

As a result of confirmation, if important colors exist in the large image, the printing terminal 201 applies a weighted density graph to the important colors in the overlapping area based on Frequency Modulation (FM) mode. For example, FM mode may represent a mode that performs printing based on the frequency of dots. Then, the printing terminal 201 generates first printing information including weighted density information of important colors in the overlapping area and density information of representative colors excluding the important colors, and transmits it to the digital printer 203.

On the other hand, when important colors do not exist in the large image, the printing terminal 201 applies a non-linear density graph to representative colors in the overlapping area based on FM mode. Then, the printing terminal 201 generates second printing information including non-linear density information of representative colors in the overlapping area and transmits it to the digital printer 203.

The digital printer 203 receives first or second printing information from the printing terminal 201 through wireless or wired communication, and prints a plurality of split images using the received first or second printing information to produce a plurality of printed matter. create them. For example, when first printing information is received, the digital printer 203 may print by weighting the density of important colors in the overlapping area more than the densities of other representative colors. In contrast, when second printing information is received, the digital printer 203 can print by equally changing the densities of representative colors in the overlapping area.

For example, the digital printer 203 may print a first split image on a first fabric in the forward direction to create a first printed matter. And the digital printer 203 may move the first print in the reverse direction so that the first overlap area of the first print overlaps the second overlap area of the second fabric. For example, the second overlapping area of the second fabric may be the same as the second overlapping area of the second split image. At this time, the overlapping area of the second fabric is located above the first overlapping area of the first printed material. And the digital printer 203 can print the second split image on the second fabric in the forward direction to create a second printed matter.

That is, the digital printer 203 can print a large image in which the end of the first split image and the beginning of the second split image overlap.

Figure 3 is a block diagram of a printing terminal 201 according to an embodiment of the present invention.

Referring to FIG. 3, the printing terminal 201 includes a control unit 301, a memory unit 303, a display unit 305, a communication unit 307, and an input/output unit 309.

Looking at each component, the memory unit 303 stores various programs and data necessary for the operation of the printing terminal 201. For example, the memory unit 303 may be implemented as non-volatile memory, volatile memory, flash memory, hard disk drive (HDD), or solid state drive (SSD). For example, the memory unit 303 may store a printing program in advance. For example, the printing program may be the Blue Clip program.

The display unit 305 displays image data under the control of the control unit 301. The implementation method of the display unit 305 is not limited, and may be implemented with various types of displays such as, for example, LCD, OLED display, AM-OLED, and PDP. The display unit 305 may additionally include additional components depending on its implementation method. For example, when the display unit 305 is a liquid crystal display panel, the display unit 305 includes an LCD display panel (not shown), a backlight unit (not shown) that supplies light to the display panel, and a panel that drives the panel (not shown). It may include a driving substrate (not shown). The display unit 305 may be combined with a touch panel (not shown) of the input/output unit 309 to provide a touch screen (not shown).

The communication unit 307 communicates with the digital printer 203 through various types of wired or wireless communication methods. For example, the communication unit 307 may include at least one of a Wi-Fi module, an LTE module, a 5G module, a LoRa module, a Bluetooth module, and a Zigbee module. For example, the Wi-Fi module can perform wireless communication according to the WiFi method, and the LTE module can perform wireless communication according to various communication standards such as IEEE, LTE, etc. For example, the communication unit 307 may transmit first or second printing information to the digital printer 203 using wireless communication.

As another example, the communication unit 307 may perform wired communication with the digital printer 203 according to various communication standards such as LAN, RS-232C, RS-422, RS-485, or USB port. For example, the communication unit 307 may transmit the first or second printing information to the digital printer 203 through wired communication.

The input/output unit 309 receives various commands from the user or outputs various data to an external device. For example, the input/output unit 309 may include at least one of a keyboard, a mouse, a touch panel, and a speaker.

The control unit 301 controls the overall operation of the printing terminal 201 using various programs stored in the memory 303.

For example, the control unit 301 may check whether an image for printing is selected by the user through a printing program stored in the memory 303. For example, an image for printing may represent an image requested to be printed by a user. For example, an image for printing may represent a large image in which the length (L) of the unit image in the in-line direction is longer than the length of a single piece of fabric or longer than the circumference length (R) of a photo imaging plate.

As a result of confirmation, if an image for printing is selected, the control unit 301 can detect and display the image for printing selected by the user through the display unit 305.

Additionally, the control unit 301 can check whether division of the image for printing displayed through the printing program is requested by the user.

As a result of confirmation, if segmentation of the displayed printing image is requested, the control unit 301 can analyze the overlapping area of the large image and identify the important color of the overlapping area among a plurality of representative colors. For example, a critical color may represent the color with the highest frequency in the overlapping area.

As a result of confirmation, if an important color exists, the control unit 301 may apply a weighted density graph to the important color in the overlapping area based on FM mode. For example, the control unit 301 may increase the density of important colors, as shown in the density graph 801 of FIG. 8.

In addition, the control unit 301 can display a plurality of divided images for printing through the display unit 305 by considering important colors to which the weighted density graph is applied.

And the control unit 301 can check whether a print request is input by the user through a print program.

As a result of confirmation, if a print request is input, the control unit 301 can generate first print information and transmit the first print information to the digital printer 203 through the communication unit 307. For example, the first printing information may include weighted density information of important colors in the overlapping area and density information of representative colors excluding the important colors.

On the other hand, when an important color does not exist, the control unit 301 may apply a non-linear density graph to the representative colors of the overlapping area based on FM mode.

In addition, the control unit 301 can display a plurality of divided images for printing through the display unit 305 by considering representative colors to which a non-linear density graph is applied.

And the control unit 301 can check whether a print request is input by the user through a print program.

As a result of confirmation, if a print request is input, the control unit 301 can generate second print information and transmit the second print information to the digital printer 203 through the communication unit 307. For example, the second printing information may include non-linear density information of representative colors in the overlapping area.

Figure 4 is a block diagram of a digital printer 203 according to an embodiment of the present invention.

Referring to FIG. 4, the digital printer includes a control unit 401, a memory 403, a communication unit 405, and a printing device 407.

Looking at each component, the memory 403 stores various programs and data necessary for the operation of the digital printer. For example, the memory 403 may be implemented as non-volatile memory, volatile memory, flash memory, hard disk drive (HDD), or solid state drive (SSD).

The communication unit 405 communicates with the printing terminal 201 through various types of wired or wireless communication methods. For example, the communication unit 405 may include at least one of a Wi-Fi module, an LTE module, a 5G module, a LoRa module, a Bluetooth module, and a Zigbee module. For example, the communication unit 405 may receive first or second printing information from the printing terminal 201 using wireless communication.

As another example, the communication unit 405 may perform wired communication with the printing terminal 201 according to various communication standards such as LAN, RS-232C, RS-422, RS-485, or USB port. For example, the communication unit 405 may receive first or second printing information from the printing terminal 201 through wired communication.

The printing device 407 generates one image by continuously printing a plurality of split images under the control of the control unit 401.

The control unit 401 controls the overall operation of the digital printer using various programs stored in the memory 203.

For example, the control unit 401 receives first or second printing information from the printing terminal 201 through the communication unit 405, and operates the printing device 407 using the received first or second printing information. You can print images for printing.

At this time, the control unit 401 may print a partial area of the first split image of the large image using the FM mode through the printing device 407. For example, a partial area of the first split image may represent an area excluding the overlapping area from the area of the first split image. For example, as shown in FIG. 5 , some areas of the first split image may represent areas excluding the overlapping areas (Gzs1 to Gze1) from the area 503 of the first split image.

And the control unit 401 can print the overlapping area using FM mode through the printing device 407. For example, when first printing information is received, the control unit 401 selects an important color according to a predetermined streamline shape based on the first diagonal line 603 slanted from left to right, as shown in FIG. The densities of representative colors, excluding , can be printed by gradually decreasing non-linearly from 100 to 0. In addition, the control unit 401 can print by non-linearly gradually decreasing the density of important colors from 100 to 0 along the first streamline 605, which has a larger waveform than the pre-designated streamline based on the first diagonal line 603. there is.

As another example, when second printing information is received, the control unit 401 divides the densities of representative colors into a first fan shape based on the third diagonal line 903 slanted from left to right, as shown in FIG. 9. It can be printed by reducing it to type 905.

Additionally, the control unit 401 may retract the fabric on which the first split image is printed through the printing device 407 by the length of the pre-designated overlapping area.

And the control unit 401 can print the overlapping area according to a predetermined ratio using FM mode through the printing device 407. For example, when the first print information is received, the control unit 401 prints the important colors along a predetermined streamline shape based on the second diagonal line 607 slanted from right to left, as shown in FIG. 6. The densities of representative colors, excluding , can be printed by gradually weighting them non-linearly from 0 to 100. In addition, the control unit 401 can print by non-linearly weighting the density of important colors gradually from 0 to 100 according to the second streamline 609, which has a larger waveform than the pre-designated streamline based on the second diagonal line 607. there is.

As another example, when second printing information is received, the control unit 401 divides the densities of representative colors into a second fan shape based on the fourth diagonal line 907 slanted from right to left, as shown in FIG. It can be printed by weighting it by type (909).

And the control unit 401 can print a partial area of the second split image of the large image using FM mode through the printing device 407. For example, a partial area of the second split image may represent an area excluding the overlapping area from the area of the second split image. For example, as shown in FIG. 5 , some areas of the second split image may represent areas excluding the overlapping areas (Gzs2 to Gze2) from the area 505 of the second split image.

Through this operation, an embodiment of the present invention can eliminate stitching lines that occur when dividing and printing a large image in a printing system. In addition, in one embodiment of the present invention, the stitching line can be removed by overlapping and printing portions of a plurality of split images in a printing system. Additionally, in an embodiment of the present invention, a stitching line can be removed by adjusting the density of a representative color for an overlapping area of overlapping segmented images in a printing system.

Figure 5 is a diagram of printing a large image in a digital printer 203 according to an embodiment of the present invention.

Referring to FIG. 5, the digital printer 203 prints the first split image 503 on the fabric and then moves the printing fabric to the start point (GZS1) of the first overlapping area of the first split image 503. . Then, the digital printer 203 completes printing the large image 501 by printing the second split image 505 at the start point (Gzs1) of the first overlapping area of the first split image 503.

That is, the digital printer 203 prints the overlapping area (GZ) of the large image 501 twice to avoid linear stitching lines. If the first printing information is received from the printing terminal 201, the digital printer 203 divides the color density of the important color of the first overlapping area of the first split image 503 and the second division according to a predetermined ratio. By printing by increasing or decreasing the color density of important colors in the second overlapping area of the image 505, the occurrence of a stitching line with a certain width can be prevented.

On the other hand, when the second printing information is received from the printing terminal 201, the digital printer 203 combines the color densities of the representative colors of the first overlapping area of the first split image 503 according to a predetermined ratio. By printing by weighting the color densities of the representative colors of the second overlapping area of the two-segment image 505, the occurrence of a stitching line with a certain width can be prevented.

Figure 6 is a graph showing the density of important colors in the overlapping area of a large image according to an embodiment of the present invention.

Referring to FIG. 6, if first printing information is received, the digital printer 203 determines the density of the important color in the overlapping area of the first split image to the first, as shown in the density graph 601. It is printed by weighting or decreasing it in a first streamlined shape (605) centered on the diagonal line (603). And the digital printer prints by weighting or reducing the density of important colors in the overlapping area of the second split image in a second streamlined shape 609 centered on the second diagonal line 607.

For example, the density of important colors can be weighted by a predetermined ratio. For example, the predetermined ratio may be about 10 to 20%. For example, the sum 611 of the intensities of important colors at the center line of the overlapping area may be around 130.

Figure 7 is a diagram showing characteristics of FM mode according to an embodiment of the present invention.

Referring to FIG. 7, FM mode has the following characteristics.

1. The size of the set point does not change.

The dot size in FM mode is about 5 to 6% compared to the dot size in Amplitude Modulation (AM) mode, so the dots in FM mode are called microdots. The normal dot size for FM mode is 20 microdot.

2. The size of a point once set does not change, but the frequency of the point does change.

3. A high frequency of points within a certain space indicates a high density of points. (Frequency↑⇒Density↑)

For example, as in image 701 of FIG. 7, as the frequency and density increase, the image may become darker.

4. When the density of dots is high, the empty space between dots becomes narrow.

5. Where and how many dots will be placed is based on a mathematical statistical probability model.

Accordingly, FM mode is also called stochastic screening.

Meanwhile, in FM mode, it is set that the size of the dot does not change, but as shown in screen 703 of FIG. 7, the size of the dot may change.

Comparing AM mode and FM mode, it can be seen as shown in Table 1 below.

AM mode FM mode row per inch fix doesn't exist spot size change fix density schedule change space change change rosette With rosette pattern doesn't exist main factors rows/inches, point size Spot size, frequency

Here, AM mode adjusts the space by varying the dot size based on the initially set row/inch. In contrast, FM mode adjusts the space by varying the frequency of dots based on the initially set dot size.

This FM mode has the following advantages.

1. Moiré (rosette) does not occur because the dots do not have a pattern and are taken randomly based on mathematical probability.

2. AM mode responds sensitively to cmyk angle changes, but in FM mode, there is no concept of angle, so there is no response to angle changes.

3. Resistant to mechanical (press, fabric-related) errors (rosette drift phenomenon due to misregistration).

4. It is strong in detailed expression because it uses microdots that can have a more even distribution than AM mode. (Removes color jump phenomenon)

5. It has a wider color gamut than AM mode.

6. Because it is a microdot, ink dries faster than AM.

7. Improve color and halftone stability.

Figure 9 is a graph showing the densities of representative colors in the overlapping area of a large image according to an embodiment of the present invention.

Referring to FIG. 9, if second printing information is received, the digital printer 203 converts the densities of representative colors of the overlapping area of the first split image into the third, as shown in the density graph 901. It is printed with the same decrease in the first fan shape (903) centered on the diagonal line (903). And the digital printer prints by weighting the densities of representative colors in the overlapping area of the second split image in a second fan shape (609) centered on the fourth diagonal line (907).

Figure 10 is a diagram illustrating multiple gradient shapes according to an embodiment of the present invention.

Referring to FIG. 10 , for example, the gradient form of a pre-designated overlapping area may be a gradient form selected by the user from among a plurality of gradient forms. For example, multiple gradient shapes, as shown in Figure 10, include a straight line (1001), cosine wave shapes with different periods (1003, 1005, 1007, 1009, 1011, 1013, 1015) and a diagonal line (1017). and trapezoidal shapes (1019, 1021) and wave shapes with different periods (1023, 1025, 1027).

Figures 11A to 11C are diagrams illustrating a procedure for printing a large image in the printing device 407 according to an embodiment of the present invention.

Referring to FIG. 11A, the printing device 407 includes a printing engine core portion (C), a pair of horizontal reciprocating transfer rollers (HR1, HR2), an unwinder roll 1110, a rewinder roll 1150, and a fabric It includes a primer processing unit 1120 for pre-processing suitable for printing.

A pair of fabric horizontal reciprocating transfer rollers (HR1, HR2) simultaneously reciprocate left or right along the horizontal guide rail (GR). To briefly explain the present invention, it is assumed that a pair of horizontal fabric reciprocating transfer rollers (HR1, HR2) are located at a position to start printing (left end of the horizontal guide rail (GR)).

The fabric 1107 that is continuously unwound from the unwinder roll 1110 is driven by a first forward and reverse driving roller (R1), a horizontal reciprocating transfer roller at the top of the fabric (HR1), and a second forward and reverse driving roller (R2). It is sequentially supplied between the blanket 1104 and the print roller 1106 (hereinafter, the transfer path of the unprinted part of the fabric). And the fabric passing between the blanket 1104 and the print roller 1106 is a predetermined printed image filmed from the blanket 1104 while the print roller 1106 is in contact with the blanket 1104 and rotates ( 1105) is transferred to the surface and printed, and then passes through the third forward and reverse driving roller (R3), the lower horizontal reciprocating transfer roller (HR2) and the fourth forward and reverse driving roller (R4) to a rewinder roll (or printing fabric winding roll). It is wound at (1150) (above, the transfer path of the printing unit of the printed fabric).

As described above, as a pair of fabric horizontal reciprocating transfer rollers (HR1, HR2) reciprocate left and right along the guide rail (GR) at predetermined time intervals, the above-mentioned forward and reverse drive rollers (R1 to R4) The forward/reverse drive direction is switched. That is, while the horizontal reciprocating transfer rollers (HR1 and HR2) move to the right along the guide rail (GR), the moving direction of the fabric is in the forward direction. Printing continues while the fabric is moving in the forward direction.

In contrast, while the horizontal reciprocating transfer rollers (HR1 and HR2) move to the left along the guide rail (GR), the transfer direction of the fabric is reverse. Printing stops while the fabric is moving in the reverse direction. When the fabric transfer direction is reverse, a positioning operation is performed to connect the starting end of the second split image to the ending end of the first split image.

Meanwhile, the relationship between the inline running direction length (L) of the unit image printed on the fabric 1107 and the circumferential length (R) of the photo imaging plate 1103 is such that the circumferential length (R) is the inline running direction length (L) of the unit image. ), the printing device 407 can smoothly proceed with printing by driving the print roller 1106 in the forward direction without the need to change the moving direction of the fabric.

However, if the relationship between the in-line direction length (L) of the unit image and the circumferential length (R) of the photo imaging plate 1103 is not an integer multiple of the in-line direction length (L) of the unit image, printing The device 407 determines a predetermined length of overprinted fabric as an unprinted portion in order to prevent portions where other images are overprinted or to prevent waste of fabric due to occurrence of unprinted portions. . Then, the printing device 407 changes the moving direction of the fabric in the reverse direction to perform position correction so that the subsequent printing position is connected to the unprinted portion, changes the moving direction of the fabric to the forward direction, and continuously prints unit images. .

Alternatively, when the in-line progress direction length (L) of the unit image is longer than the circumferential length (R) of the photo imaging plate 1103 (L>R), the printing device 407 prints the unit image into a plurality of images (e.g. , two images), and the divided images must be automatically connected and printed with a time difference.

In this case, the printing device 407 reverses the transfer direction of the fabric 807 from the forward direction to the reverse direction and then moves the first split image (or preceding split image) in the reverse direction to create the first split image and the second split image. Align the positions of the connections between (or subsequent segmented images). Then, the printing device 407 reverses the transfer direction of the fabric 1107 from the reverse direction to the forward direction and then prints the second split image.

Among these, the present invention is a technology for application in cases where the in-line traveling direction length (L) of a unit image is longer than the circumferential length (R) of the photo imaging plate 1103. From now on, the operation procedure of the printing device 407 will be described in detail with reference to FIGS. 11B and 11C.

In FIG. 11b, the printing device 407 is designed to primarily print while moving a pair of horizontal reciprocating transfer rollers (HR1, HR2) from the left end of the guide rail (GR) to the right along the guide rail (GR). Start printing the first split image.

At this time, the printing device 407 obtains the first divided image on the cylindrical photoimaging plate 1103. Thereafter, while maintaining the blanket 1104 in contact with the photo imaging plate 1103 and its outer peripheral surface, the printing device 407 moves the photo imaging plate 1103 counterclockwise and the blanket 1104. Rotate clockwise to transfer the first split image applied to the photo imaging plate 1103 to the blanket 1104. Then, the printing device 407 transfers the first split image transferred to the planket 1104 to the fabric being transported through the print roller 1106. Through this operation, the first split image is printed on the fabric.

Afterwards, the printing device 407 advances the fabric over the print roller 1106 in an unprinted state for the length of the second split image from the point where the first split image was completed printing. This non-printing overrun progresses until it reaches a position (right end of the guide rail GR) where the pair of horizontal reciprocating transfer rollers HR1 and HR2 finish moving in the right direction.

While overrunning the length of the second split image in an unprinted state, the printing device 407 generates the subsequent second split image on the plate 803.

In FIG. 11C, the printing device 407 intends to print secondarily while moving a pair of horizontal reciprocating transfer rollers HR1 and HR2 along the guide rail GR from the right end of the guide rail GR to the left. Prepare for printing the second split image. At this time, the transfer direction of the fabric 1107 proceeds in the reverse direction. The print roller 1106 is separated from the blanket 1104 at a gap G.

As the moving direction of the pair of horizontal reciprocating transfer rollers (HR1, HR2) and the driving direction of the normal and reverse drive rollers (R1 to R4) are both changed to the reverse direction, the non-printing section for printing of the overrun second split image moves in the reverse direction. and moves to a position connected to the first split image. In this way, while the reverse direction of fabric transfer continues, the second split image output on the plate 1103 is transferred to the blanket 1104.

At the point where the feedback (reverse movement) of the printing fabric is completed, the print roller 1106 comes into contact with the blanket 1104 again. Through this operation, the printing fabric moves in the reverse direction, and after the starting point of the non-printing section reaches the point where it is connected to the first split image, the print roller 1106 is again in pressure contact with the blanket 1104. A contact position is achieved that returns to .

When this contact position is completed, the driving direction of the forward and reverse driving rollers (R1 to R4) is changed back to the forward direction, so that the moving direction of the fabric advances in the forward direction, so that the second split image is connected to the first split image and continuously printed. Hereafter, the printing procedure for the second split image is the same as the printing procedure for the first split image, and will not be described in detail. By repeating this cycle, the roll-to-roll printing device 407 can print large images.

Figure 12 is a flowchart of printing a large image in a printing system according to an embodiment of the present invention.

Referring to FIG. 12, in step 1201, the printing terminal 201 checks whether an image for printing is selected by the user through a printing program. For example, an image for printing may represent an image requested to be printed by a user. For example, an image for printing may represent a large image in which the length (L) of the unit image in the in-line direction is longer than the length of a single piece of fabric or longer than the circumference length (R) of a photo imaging plate.

As a result of the confirmation, if the image for printing is selected, the printing terminal 201 proceeds to step 1203. Otherwise, step 1201 is repeatedly performed.

In step 1203, the printing terminal 201 detects and displays the printing image selected by the user, and then proceeds to step 1205.

In step 1205, the printing terminal 201 determines whether segmentation of the displayed printing image is requested by the user.

As a result of confirmation, if segmentation of the displayed printing image is requested, the printing terminal 201 proceeds to step 1207. Otherwise, step 1205 is repeatedly performed.

In step 1207, the printing terminal 201 analyzes the overlapping area of the large image and identifies important colors in the overlapping area among a plurality of representative colors. For example, a critical color may represent the color with the highest frequency in the overlapping area.

As a result of the confirmation, if an important color exists, the printing terminal 201 proceeds to step 1209. Otherwise, it proceeds to step 1219.

If the process proceeds to step 1209, the printing terminal 201 applies a weighted density graph to important colors in the overlapping area based on FM mode. For example, the printing terminal 201 can increase the density of important colors, as shown in the density graph 801 of FIG. 8.

In step 1211, the printing terminal 201 displays a plurality of divided images for printing in consideration of important colors to which the weighted density graph is applied.

In step 1213, the printing terminal 201 checks whether a printing request is input by the user.

As a result of confirmation, if a print request is input, the printing terminal 201 proceeds to step 1215. Otherwise, step 1213 is repeatedly performed.

In step 1215, the printing terminal 201 generates first printing information. For example, the first printing information may include weighted density information of important colors in the overlapping area and density information of representative colors excluding the important colors.

In step 1217, the printing terminal 201 transmits first printing information to the digital printer 203.

If the process proceeds to step 1219, the printing terminal 201 applies a non-linear density graph to the representative colors of the overlapping area based on FM mode.

In step 1221, the printing terminal 201 displays a plurality of divided images for printing in consideration of representative colors to which a non-linear density graph is applied.

In step 1223, the printing terminal 201 checks whether a printing request is entered by the user.

As a result of confirmation, if a print request is input, the printing terminal 201 proceeds to step 1225. Otherwise, step 1223 is repeatedly performed.

In step 1225, the printing terminal 201 generates second printing information. For example, the second printing information may include non-linear density information of representative colors in the overlapping area.

In step 1227, the printing terminal 201 transmits second printing information to the digital printer 203.

In step 1229, the digital printer 203 receives first or second printing information from the printing terminal 201 and prints a printing image using the received first or second printing information.

At this time, the digital printer 203 prints a partial area of the first split image of the large image using FM mode. For example, a partial area of the first split image may represent an area excluding the overlapping area from the area of the first split image. For example, as shown in FIG. 5 , some areas of the first split image may represent areas excluding the overlapping areas (Gzs1 to Gze1) from the area 503 of the first split image.

And the digital printer 203 prints the overlapping area using FM mode. For example, when first printing information is received, the digital printer 203 prints the important information according to a predefined streamline shape based on the first diagonal line 603 slanted from left to right, as shown in FIG. 6. The densities of representative colors, excluding color, can be printed by gradually decreasing non-linearly from 100 to 0. And the digital printer 203 prints by non-linearly gradually decreasing the density of important colors from 100 to 0 along the first streamline 605, which has a larger waveform than the pre-designated streamline based on the first diagonal line 603. You can.

As another example, when second printing information is received, the digital printer 203 first prints the densities of representative colors based on the third diagonal line 903 slanted from left to right, as shown in FIG. 9. It can be printed by reducing it to a fan shape (905).

Then, the digital printer 203 retracts the fabric on which the first split image is printed by the length of the pre-designated overlapping area.

And the digital printer 203 uses FM mode to print the overlapping area according to a predetermined ratio. For example, when first printing information is received, the digital printer 203 prints the important information along a predefined streamline shape based on a second diagonal line 607 slanted from right to left, as shown in FIG. The densities of representative colors, excluding color, can be printed by gradually weighting them non-linearly from 0 to 100. And the digital printer 203 prints by non-linearly weighting the density of important colors gradually from 0 to 100 according to the second streamline 609, which has a larger waveform than the pre-designated streamline based on the second diagonal line 607. You can.

As another example, when second printing information is received, the digital printer 203 secondly prints the densities of representative colors based on the fourth diagonal line 907 inclined from right to left, as shown in FIG. 9. It can be printed by weighting it in a fan shape (909).

Then, the digital printer 203 prints a partial area of the second split image of the large image using FM mode. For example, a partial area of the second split image may represent an area excluding the overlapping area from the area of the second split image. For example, as shown in FIG. 5 , some areas of the second split image may represent areas excluding the overlapping areas (Gzs2 to Gze2) from the area 505 of the second split image.

Through this process, an embodiment of the present invention can eliminate stitching lines that occur when dividing and printing a large image in a printing system. In addition, in one embodiment of the present invention, the stitching line can be removed by overlapping and printing portions of a plurality of split images in a printing system. Additionally, in an embodiment of the present invention, a stitching line can be removed by adjusting the density of a representative color for an overlapping area of overlapping segmented images in a printing system.

In the above, preferred embodiments of the present invention have been shown and described, but the present invention is not limited to the specific embodiments described above, and may be used in the technical field to which the invention pertains without departing from the gist of the invention as claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be understood individually from the technical idea or perspective of the present invention.

201: Printing terminal
203: Digital printing press
301: Control unit
303: memory
305: display unit
307: Department of Communications
309: input/output unit
401: Control unit
403: Memory
405: Department of Communications
407: Printing device

Claims (10)

Analyze multiple colors in the overlapping area of the large image to determine whether an important color exists among the representative colors. As a result of the confirmation, if the important color exists, another color excluding the important color from among the representative colors is determined. A first print that applies the density of representative colors, applies the density of the important color according to a predetermined ratio different from the density of the other representative colors, and includes density information of the important color and density information of the other representative colors. A printing terminal that generates information and transmits it to a digital printer; and
Receiving the first printing information from the printing terminal, printing the area excluding the overlapping area in the first split image of the large image on the fabric using the first printing information based on the FM mode, and using the FM mode Based on this, apply the densities of the other representative colors using the first printing information and change the density of the important color differently from the densities of the other representative colors according to the ratio to create the overlapping area of the first split image. Printing, the fabric on which the first split image is printed is retreated to the starting position of the overlapping area, and the densities of the other representative colors are applied according to the ratio using the first printing information based on the FM mode. The overlapping area of the second split image of the large image is printed by changing the density of the important color differently from the density of the other representative colors, and an area excluding the overlapping area in the second split image based on the FM mode. Including the digital printer for printing,
The important color represents the color with the highest frequency in the overlapping area among the representative colors,
The FM mode is a device for printing a digital image in a printing system, characterized in that it represents a mode in which printing is performed based on the frequency of dots.
According to paragraph 1,
The device for printing a digital image in a printing system, characterized in that the ratio is set to one within 10 to 20 percent.
According to paragraph 1,
The control unit prints by gradually reducing the density of the other representative colors based on a first diagonal line, and prints by gradually reducing the density of the important colors in a first streamline around the first diagonal line. A device that prints digital images in a printing system.
According to paragraph 3,
The control unit gradually prints by weighting the density of the other representative colors based on a second diagonal line, and gradually prints by weighting the density of the important colors in a second streamline around the second diagonal line. A device that prints digital images in a printing system.
According to paragraph 1,
If the important color does not exist, the printing terminal generates second printing information including density information of the representative colors and transmits it to the digital printer,
The digital printer receives the second printing information from the printing terminal, and uses the second printing information based on the FM mode to print an area excluding the overlapping area in the first split image of the large image to the fabric. Printing, printing the overlapping area of the first split image by reducing the densities of the representative colors based on the FM mode, and retracting the fabric on which the first split image is printed to the starting position of the overlapping area, Printing the overlapping area of the second split image of the large image by weighting the densities of the representative colors based on the FM mode, and printing the area excluding the overlapping area in the second split image based on the FM mode A device for printing a digital image in a printing system characterized in that.
A process in which a printing terminal analyzes multiple colors in an overlapping area of a large image to determine whether an important color representing the most used color exists among representative colors;
As a result of the confirmation, if the important color exists, the printing terminal applies the density of other representative colors excluding the important color among the representative colors, according to a predetermined ratio different from the density of the other representative colors. The process of applying the density of the important colors,
A process in which the printing terminal generates first printing information including density information of the important colors and density information of the other representative colors and transmits it to a digital printer,
A process of the digital printer receiving the first printing information from the printing terminal,
A process of printing, by the digital printer, an area excluding the overlapping area in the first split image of the large image on the fabric using the first printing information based on FM mode,
The digital printer applies the densities of the other representative colors using the first printing information based on the FM mode and changes the density of the important color to be different from the densities of the other representative colors according to the ratio. A process of printing the overlapping area of a one-segment image,
A process in which the digital printer retracts the fabric on which the first split image is printed to the starting position of the overlapping area,
The digital printer applies the densities of the other representative colors using the first printing information based on the FM mode and changes the density of the important colors differently from the densities of the other representative colors according to the ratio to print the large format. A process of printing the overlapping area of the second segment image of the image, and
A process of printing, by the digital printer, an area excluding the overlapping area in the second split image based on the FM mode,
The important color represents the color with the highest frequency in the overlapping area among the representative colors,
The FM mode is a method of printing a digital image in a printing system, wherein the FM mode represents a mode in which printing is performed based on the frequency of dots.
According to clause 6,
A method of printing a digital image in a printing system, wherein the ratio is set to one within 10 to 20 percent.
According to clause 6,
The process of printing the overlapping area of the first divided image is,
A process of printing by gradually reducing the density of the other representative colors based on the first diagonal line, and
A method of printing a digital image in a printing system, comprising the step of gradually reducing the density of the important colors in a first streamline shape centered on the first diagonal line.
According to clause 8,
The process of printing the overlapping area of the second split image of the large image,
A process of gradually printing by weighting the density of the different representative colors based on the second diagonal line, and
A method of printing a digital image in a printing system, comprising the step of gradually printing by increasing the density of the important colors in a second streamline shape centered on the second diagonal line.
According to clause 6,
A process in which the printing terminal, when the important color does not exist, generates second printing information including density information of the representative colors and transmits it to a digital printer;
A process of the digital printer receiving the second printing information from the printing terminal,
A process of printing, by the digital printer, an area excluding the overlapping area in the first split image of the large image on the fabric using the second printing information based on the FM mode,
A process in which the digital printer prints the overlapping area of the first split image by reducing the densities of the representative colors based on the FM mode,
A process in which the digital printer retracts the fabric on which the first split image is printed to the starting position of the overlapping area,
A process of printing, by the digital printer, the overlapping area of the second split image of the large image by weighting the densities of the representative colors based on the FM mode, and
A method of printing a digital image in a printing system further comprising printing, by the digital printer, an area excluding the overlapping area in the second split image based on the FM mode.

Images