JP7302335B2 - Image forming processing system, image density presentation method, program and printed matter - Google Patents

Description

The present invention relates to an image forming processing system, an image density presentation method, a program, and printed matter.

2. Description of the Related Art Liquid ejection heads used in ink jet image forming apparatuses may have variations in ejection speed and ejection amount among a plurality of liquid ejection heads due to manufacturing errors and the like. Such variations tend to cause density unevenness in an image formed on a recording object.

Therefore, a technique for uniforming the density of an image to be formed by detecting density unevenness of the liquid ejected from the liquid ejection head and correcting the amount of liquid ejected from the liquid ejection head based on the detected density unevenness. It has been known. For example, Japanese Patent Application Laid-Open No. 2002-200001 discloses that a test chart is printed for the purpose of correcting unevenness in print density due to variations in ejection characteristics of an inkjet printer head, and correction values for unevenness in density are obtained based on the test chart.

However, in the above method, the user visually confirms whether or not the image formed by the image forming apparatus such as an inkjet printer has the desired density using the recording material on which the image is formed. , there is a problem that it is difficult to determine whether the concentration is the desired one.

An image forming processing system according to claim 1 comprises reading means for reading an image formed on a recording object by an image forming apparatus, and calculating means for calculating the density of each predetermined area in the read image read by the reading means. and, if there is an area where the density calculated by the calculating means satisfies a predetermined condition, an image of the first area that does not satisfy the condition, and an image of the second area that satisfies the condition. , and output means for outputting visual information associated with the second region , wherein the visual information includes information about a density distribution of the image, the visual information includes a full width of the image, a plurality of are associated with the gradation values, and a plurality of gradation values are output .

According to the present invention, it is possible to improve the efficiency of confirming the density of an image formed on a recording object.

1 is a diagram illustrating an example of a system configuration of a printing system according to a first embodiment; FIG. 1 is a schematic front view showing an example of the configuration of a printing apparatus according to a first embodiment; FIG. It is a schematic diagram showing an example of a configuration of a head array according to the first embodiment. FIG. 4 is a schematic diagram for explaining density unevenness of a printed image; 2 illustrates an example hardware configuration of a print control apparatus according to the first embodiment; FIG. 1 illustrates an example hardware configuration of a printing apparatus according to a first embodiment; FIG. 1 illustrates an example functional configuration of a printing system according to a first embodiment; FIG. 3 is a diagram illustrating an example of a detailed functional configuration of an analysis unit in the print control device according to the first embodiment; FIG. 4 is a diagram showing an example of a correction value management table according to the first embodiment; FIG. 4 is a sequence diagram showing an example of density adjustment processing in the print processing system according to the first embodiment; FIG. 3A and 3B are diagrams showing examples of operation screens displayed on the printing apparatus according to the first embodiment; FIG. FIG. 5 is a diagram showing an example of an adjustment chart printed by the printing apparatus according to the first embodiment; 4A, 4B, and 4C are diagrams for explaining an example of processing of a density calculation unit in the print control apparatus according to the first embodiment; FIG. FIG. 5 is a diagram showing an example of a correction chart printed by the printing apparatus according to the first embodiment; 7 is a flowchart illustrating an example of correction chart analysis processing in the print control apparatus according to the first embodiment; 7A to 7D are diagrams for explaining an example of correction chart analysis processing in the print control apparatus according to the first embodiment; FIG. FIG. 5 is a diagram showing an example of an analysis chart printed by the printing apparatus according to the first embodiment; FIG. FIG. 7 is a diagram showing an example of an evaluation result confirmation screen displayed on the printing device according to the first embodiment; 4A and 4B are diagrams showing an example of scan data in the print processing system according to the first embodiment; FIG. It is a figure which shows an example of density distribution of an abnormal image. FIG. 9 is a diagram showing a modified example of an analysis chart printed by the printing apparatus according to the first embodiment; FIG. 5 is a diagram showing a modified example of an operation screen displayed on the printing apparatus according to the first embodiment; FIG. FIG. 10 is a diagram illustrating an example of a detailed functional configuration of an analysis unit in a print control device according to a modified example of the first embodiment; 9 is a flowchart showing an example of correction chart analysis processing in a print control apparatus according to a modification of the first embodiment; FIG. 11 is a diagram for explaining an example of correction chart analysis processing in a print control apparatus according to a modification of the first embodiment; (a) is a diagram showing an example of the density distribution of a normal image. (b) is a diagram showing an example of density distribution of an abnormal image. FIG. 11 is a sequence diagram showing an example of density adjustment processing in the print processing system according to the second embodiment; FIG. 11 is a diagram showing an example of an evaluation result confirmation screen displayed on the printing apparatus according to the second embodiment; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

●First Embodiment●
●System Configuration FIG. 1 is a diagram showing an example of the system configuration of a printing system according to the first embodiment. The printing system 1 is a system that can improve the efficiency of a user's confirmation work of the density of an image formed on a recording object.

As shown in FIG. 1, the printing system 1 is composed of a communication terminal 10 and a printing processing system 2. As shown in FIG. The printing system 1 is an example of an image forming system. The print processing system 2 also includes a print control device (DFE (Digital Front End) server) 30 and a printer 50 . The print processing system 2 is an example of an image forming processing system.

The communication terminal 10 and the print control device 30 are communicably connected via a first communication network such as a LAN (Local Area Network) 8 or the like. The print control device 30 and the printing device 50 are communicably connected via a second communication network such as the dedicated line 9 . In the following description, an inkjet printing system 1, particularly a production printing system, will be described as a specific example, but each embodiment of the present invention can also be applied to other printing systems.

The communication terminal 10 is a PC (Personal Computer) for viewing and editing print data, which is an example of image formation target data. The communication terminal 10 is not limited to a PC, and may be, for example, a mobile phone, a smart phone, a tablet terminal, a digital camera, or the like. The print control device 30 is a server computer for generating bitmap data for printing based on print data sent from the communication terminal 10 and for transmitting the generated bitmap data and a print instruction to the printing device 50 . be. The print control device 30 is an example of an image formation control device. The printing device 50 prints an image on printing paper based on the bitmap data transmitted from the printing control device 30 . The printing device 50 is an example of an image forming device.

Although FIG. 1 illustrates an example in which the printing system 1 is composed of one communication terminal 10, one printing control device 30, and one printing device 50, the present invention is not limited to this. The printing system 1 may have, for example, multiple units of at least one of the communication terminals 10 , the print control devices 30 and the printing devices 50 . In the following description, an example in which the print processing system 2 is configured by the print control device 30 and the printing device 50 will be described. , the printing device 50 alone may be used.

Next, the configuration of the printing device 50 will be described with reference to FIGS. 2 to 4. FIG. FIG. 2 is a schematic front view showing an example of the configuration of the printing apparatus according to the first embodiment; A printing apparatus 50 shown in FIG. 2 is a liquid ejection apparatus that ejects liquid from a liquid ejection head 69 and applies the ejected liquid to a recording object. The printing device 50 forms an image on a recording object such as paper P by ejecting ink as liquid from the liquid ejection head 69, for example.

As shown in FIG. 2, the printing apparatus 50 includes a transport drum 61 that holds and transports the paper P on its peripheral surface when liquid is ejected, a paper feed tray 62 that stacks the paper P and supplies it to the transport drum 61, and a transport drum. A discharge tray 63 for receiving and stacking the paper P to be transported by ejecting liquid on the peripheral surface of the drum 61, and a head array 600 for ejecting the liquid onto the paper P held on the peripheral surface of the transport drum 61. Prepare.

The transport drum 61 transports, for example, the paper P sent from the paper feed tray 62 to the drum side. A plurality of small holes penetrating into the negative pressure space on the inner peripheral side of the drum are provided on the peripheral surface of the conveying drum 61, and when the negative pressure space is brought into a negative pressure state by a negative pressure generating pump, The paper P is held in close contact with the peripheral surface of the transport drum 61 .

Sheets P stacked on the paper feed tray 62 are separated by a separation roller 64 and a paper feed roller 66, and are conveyed one by one to the conveying portion of the conveying drum 61 (the upper half peripheral surface of the drum between the paper feed position and the paper discharge position). area). The liquid-applied paper P transported to the paper discharge position on the peripheral surface of the transport drum 61 is handled by the paper discharge rollers 65 and the feed rollers 67 and stacked on the paper discharge tray 63 .

As shown in FIG. 2, the head array 600 includes four head units 610K, 610C, 610M, and 610Y (hereinafter referred to as head units 610K, 610C, 610M, and 610Y) radially arranged on the outer upper side of the peripheral surface of the transport drum 61 corresponding to the transport portion. When there is no need to distinguish between them, they are referred to as a head unit 610.).

As shown in FIG. 2, each head unit 610 has a base frame 620 (base frames 620K, 620C, 620M, 620Y) and a plurality of liquid ejection heads 69 held by the base frame 620. As shown in FIG. Each base frame 620 has its longitudinal direction (Z-axis direction) aligned with the drum axial direction, and both ends in the longitudinal direction correspond to the longitudinal ends of the transport drum 61 . In addition, the base frame 620 includes an ejection mechanism for ejecting the liquid from the liquid ejection head 69 . The ejection mechanism includes, for example, a tank for storing the liquid ejected from the liquid ejection head 69, a piezoelectric actuator (laminated piezoelectric element and thin film piezoelectric element), a thermal actuator using an electrothermal conversion element such as a heating resistor, a vibration plate, and the like. At least one of the structures of an electrostatic actuator made up of a counter electrode, a carriage, a supply mechanism, a maintenance/recovery mechanism, and a main scanning movement mechanism is included.

The liquid ejection head 69 ejects liquid and applies the liquid to a recording object such as paper P. As shown in FIG. FIG. 3 is a schematic diagram showing an example of the configuration of the head array according to the first embodiment. A head array 600 shown in FIG. 3 includes a plurality of head units 610 (head units 610K, 610C, 610M, 610Y). The head unit 610 ejects basic color liquids (inks) of black (K), cyan (C), magenta (M), and yellow (Y) to form an image on the paper P, for example. Note that the head array 600 is a head unit that ejects a liquid (ink) of a specific color (special color) such as orange or violet, or an overcoat that applies glossiness or other processing. A head unit or the like for ejecting a liquid for cleaning may be further provided.

The head unit 610 has a plurality of liquid ejection heads 69 provided in a staggered array (staggered arrangement). The liquid ejection heads 69 are arranged along the sub-scanning direction (Z-axis direction) orthogonal to the main scanning direction (X-axis direction), which is the rotation direction of the transport drum 61 . As shown in FIG. 3, the head unit 610 has a plurality of liquid ejection heads 69 arranged in two staggered rows. The liquid ejection heads 69 provided in different rows (for example, head rows 631K and 632K) are arranged in a state of being shifted by half a pitch. The plurality of liquid ejection heads 69 are arranged along a first direction (Z-axis direction), and extend along the first direction when viewed from a second direction (X-axis direction) orthogonal to the first direction. are provided so that there is an overlap region with the adjacent head.

In FIG. 3, the head unit 610K is composed of seven liquid ejection heads 69K_1 to 69K_7. The head unit 610C is composed of seven liquid ejection heads 69C_1 to 69C_7. The head unit 610M is composed of seven liquid ejection heads 69M_1 to 69M_7. The head unit 610Y is composed of seven liquid ejection heads 69Y_1 to 69Y_7.

In the example of FIG. 3, the plurality of liquid ejection heads 69 provided in each head unit 610 has four rows on one side and three rows on the other side. The number of liquid ejection heads 69 provided in each head unit 610 is not limited to this, and the number of liquid ejection heads 69 provided in each row may be four or three or more. Alternatively, the same number of liquid ejection heads 69 may be provided in each row. The number of rows of the liquid ejection heads 69 provided in each head unit 610 is not limited to this, and the liquid ejection heads 69 may be arranged in a staggered arrangement of three or more rows.

These liquid ejection heads 69 may differ in the amount of liquid ejected from each liquid ejection head 69 (ejection amount) depending on the output characteristics or the like. Therefore, in the printed result, color difference (density unevenness) occurs between the heads that eject the liquid applied to the paper P or within the head. Therefore, the print processing system 2 requires density adjustment for adjusting density unevenness.

FIG. 4 is a schematic diagram for explaining density unevenness of a printed image. FIG. 4A is a diagram showing an example of the print result before density adjustment. The image formed on the paper P has density unevenness along the arrangement direction (Z-axis direction) of the liquid ejection heads 69 . FIG. 4B is a diagram showing an example of the print result after density adjustment. In FIG. 4(b), the density unevenness seen in FIG. 4(a) is eliminated, and an image with a uniform density is formed along the arrangement direction (Z-axis direction) of the liquid ejection heads 69. FIG. In this manner, the print processing system 2 corrects the density difference of the liquid ejected from each liquid ejection head 69 and the density difference of the liquid applied near the boundary between the liquid ejection heads 69, thereby The density (color) of the image formed on the recording object such as the paper P can be made uniform in the arrangement direction (Z-axis direction) of 69 .

●Hardware Configuration Next, the hardware configuration of the print control device 30 will be described with reference to FIG. FIG. 5 is a diagram illustrating an example of the hardware configuration of the print control apparatus according to the first embodiment; The hardware configuration shown in FIG. 5 may have the same configuration in each embodiment, and components may be added or deleted as necessary.

As shown in FIG. 5, the print control apparatus 30 includes a CPU (Central Processing Unit) 301 that controls the overall operation of the print control apparatus 30, and a ROM (Read Program) that stores programs executed by the CPU 301, such as an IPL (Initial Program Loader). RAM (Random Access Memory) 303 used as a work area for the CPU 301; HD (Hard Disk) 304 for storing various data; (Hard Disk Drive) 305, a media I/F 307 that controls reading or writing (storage) of data to a recording medium 306 such as a flash memory, a display 308 that displays various information such as cursors, menus, windows, characters or images, A network I/F 309 for data communication using a communication network, a keyboard 311 having a plurality of keys for inputting characters, numerical values, various instructions, etc., selection and execution of various instructions, selection of processing targets, cursor a mouse 312 for moving, etc., a CD-ROM (Compact Disc Read Only Memory) 313 as an example of a removable recording medium, a CD-ROM drive 314 for controlling reading or writing of various data, an API (Application GPU (Graphics Processing Unit) 315, which has a calculation function corresponding to a programming interface) and realizes high-speed image processing calculation, and bus lines 110 such as an address bus and a data bus for electrically connecting the above components. It has

Note that the hardware configuration of the communication terminal 10 is the same as the hardware configuration of the print control device 30 shown in FIG. 5, so description thereof will be omitted.

Next, the hardware configuration of the printing device 50 will be described with reference to FIG. FIG. 6 is a diagram illustrating an example of the hardware configuration of the printing apparatus according to the first embodiment; The hardware configuration shown in FIG. 6 may have the same configuration in each embodiment, and components may be added or deleted as necessary.

The printing device 50 is composed of a controller 510 , a printer section 520 , a scanner section 530 , an operation panel 540 , an I/F 550 and a head array 600 . Of these, the printer section 520 and the scanner section 530 are mechanisms for executing image forming processing in the printing device 50 . Further, the operation panel 540 displays a current set value, a selection screen, etc., a panel display unit 540a such as a touch panel for receiving input from an operator, and a set value of conditions related to image formation such as a density setting condition. An input area 540b including a numeric keypad for accepting a copy start instruction and a start key for accepting a copy start instruction is provided. The controller 510 controls the entire printing apparatus 50, for example, controls drawing, communication, input from the operation panel 540, and the like. The head array 600 is a print head provided with a plurality of liquid ejection heads 69 as shown in FIG.

The printing apparatus 50 can switch and select the document box function, the copy function, the printer function, and the facsimile function in sequence using the application switching key of the operation panel 540 . The document box mode is set when the document box function is selected, the copy mode is set when the copy function is selected, the printer mode is set when the printer function is selected, and the facsimile mode is set when the facsimile mode is selected.

The controller 510 includes a CPU 501, which is the main part of the computer, a system memory (MEM-P) 502, a north bridge (NB) 503, a south bridge (SB) 504, an ASIC (Application Specific Integrated Circuit) 506, and a local memory which is a storage part. (MEM-C) 507, HDD 508, and HD 509 which is a storage unit. The controller 510 has a configuration in which the NB 503 and the ASIC 506 are connected via an AGP (Accelerated Graphics Port) bus 505 .

A CPU 501 is a control unit that performs overall control of the printing apparatus 50 . NB 503 is a bridge for connecting CPU 501 , MEM-P 502 , SB 504 and AGP bus 505 . The NB 503 has a memory controller that controls reading and writing to the MEM-P 502, a PCI (Peripheral Component Interconnect) master, and an AGP target.

The MEM-P 502 is composed of a ROM 502a, which is a memory for storing programs and data for realizing each function of the controller 510, and a RAM 502b, which is used as a drawing memory for expansion of programs and data, memory printing, and the like. The programs stored in the RAM 502b are recorded in a computer-readable recording medium such as a CD-ROM, FD, CD-R, DVD, etc., in an installable or executable format. can be configured to

SB 504 is a bridge for connecting NB 503 and PCI devices or peripheral devices.

The ASIC 506 is an IC (Integrated Circuit) for image processing that has hardware elements for image processing. ASIC 506 serves as a bridge connecting AGP bus 505, PCI bus, HDD 508 and MEM-C 507 respectively. The ASIC 506 includes a PCI target and AGP master, an arbiter (ARB) that forms the core of the ASIC 506, a memory controller that controls the MEM-C 507, a plurality of DMACs (Direct Memory Access Controllers) that rotate image data by hardware logic, etc. It also includes a PCI unit that transfers data between the printer section 520 and the scanner section 530 via the PCI bus. Note that the ASIC 506 may be connected to a USB (Universal Serial Bus) interface or an IEEE 1394 (Institute of Electrical and Electronics Engineers 1394) interface.

MEM-C507 is a local memory used as an image buffer for copying and an encoding buffer. The HD 509 is a storage for accumulating image data, accumulating font data used for printing, and accumulating forms. HD 509 controls reading or writing of data to HD 509 under the control of CPU 501 . The AGP bus 505 is a bus interface for graphics accelerator cards proposed to speed up graphics processing. The AGP bus 505 enables high-throughput direct access to the MEM-P 502 to speed up graphics accelerator cards.

●Functional Configuration Next, the functional configuration of the printing system 1 will be described with reference to FIGS. 7 and 8. FIG. FIG. 7 is a diagram illustrating an example of a functional configuration of a printing system according to the first embodiment;

O Functional Configuration of Communication Terminal 10 Functions realized by the communication terminal 10 shown in FIG.

The transmission/reception unit 11 has a function of exchanging various data with the print control device 30 via the LAN 8 . The transmission/reception unit 11 is implemented by, for example, the network I/F 309 and a program executed by the CPU 301 shown in FIG.

The receiving unit 12 has a function of receiving user input to input means such as the keyboard 311 shown in FIG. The reception unit 12 is realized by, for example, a program or the like executed by the CPU 301 shown in FIG.

The display control unit 13 has a function of displaying various screen information on the display 308 shown in FIG. The display control unit 13 causes the display 308 to display, for example, an operation screen for receiving an input operation by the user, using a WEB browser. The display control unit 13 causes the display 308 to display a Web page such as HTML (HyperText Markup Language), for example. The display control unit 13 is realized by, for example, a program or the like executed by the display 308 and the CPU 301 shown in FIG.

The storage/readout unit 14 has a function of storing various data in the storage unit 1000 or reading out various data from the storage unit 1000 . The storage/readout unit 14 is implemented by, for example, a program or the like executed by the CPU 301 shown in FIG. The storage unit 1000 is realized by, for example, the ROM 302 or the HD 304 shown in FIG.

Functional Configuration of Print Control Device 30 Functions realized by the print control device 30 shown in FIG. , a storage/readout unit 37 and a storage unit 3000 .

The transmission/reception unit 31 has a function of exchanging various data with the communication terminal 10 or the printing device 50 . The transmission/reception unit 31 transmits/receives various data to/from the communication terminal 10 via the LAN 8, for example. Further, the transmission/reception unit 31 transmits/receives various data to/from the printer 50 via the dedicated line 9, for example. The transmission/reception unit 31 is implemented by, for example, the network I/F 309 and a program executed by the CPU 301 shown in FIG.

The data generation unit 32 has a function of generating data to be transmitted to the printing device 50 . The data generator 32 generates, for example, processing data for performing print processing in the printer 50 . The data generator 32 is implemented by, for example, a program or the like executed by the CPU 301 shown in FIG.

The density calculation unit 33 has a function of calculating the image density in the read data transmitted from the printing device 50 . The density calculator 33 calculates the density of each pixel of the read data (scan data) transmitted from the printing device 50 . The density calculator 33 is implemented by, for example, a program or the like executed by the CPU 301 shown in FIG. The density calculator 33 is an example of a calculator.

The correction value calculator 34 has a function of calculating a correction value for the liquid ejection head 69 corresponding to the print area of each pixel based on the image density calculated by the density calculator 33 . The correction value calculator 34 calculates a density value set as a value indicating the density of the image formed by the liquid ejected from the liquid ejection head 69 and the density of each pixel of the image of the read data, which is the scan data. Based on the difference, a correction value for correcting the density value of the liquid ejected from the liquid ejection head 69 is calculated. The correction value calculator 34 is implemented by, for example, a program or the like executed by the CPU 301 shown in FIG. The correction value calculator 34 is an example of correction means.

The setting unit 35 has a function of setting various setting values in the printing operation of the printing device 50 . The setting unit 35 sets thresholds for permissible density difference or density variation, paper size, etc. as set values. The setting unit 35 is implemented by, for example, a program or the like executed by the CPU 301 shown in FIG.

The analysis unit 36 has a function of analyzing the gradation-density characteristics of read data based on the image density calculated by the density calculation unit 33 . The analysis unit 36 is implemented by, for example, a program or the like executed by the CPU 301 shown in FIG.

The storage/readout unit 37 has a function of storing various data in the storage unit 3000 or reading out various data from the storage unit 3000 . The storage/readout unit 37 is realized by, for example, a program or the like executed by the CPU 301 shown in FIG. The storage unit 3000 is implemented by, for example, the ROM 302 or HD 304 shown in FIG. The storage unit 3000 also stores a correction value management table 400 .

Here, a detailed configuration of the analysis unit 36 will be described. FIG. 8 is a diagram illustrating an example of a detailed functional configuration of an analysis unit in the print control apparatus according to the first embodiment; The analysis unit 36 includes a target pixel row processing unit 41 and a density difference detection unit 42 .

The target pixel row processing unit 41 has a function of calculating the image density of the read data received by the transmitting/receiving unit 31 for each pixel row.

The density difference detection unit 42 has a function of detecting a density difference between adjacent pixels based on the density of each pixel row calculated by the target pixel row processing unit 41 . If the density difference between adjacent pixels is equal to or greater than the threshold value set by the setting unit 35, the density difference detection unit 42 detects a density difference equal to or greater than the allowable range.

○ Correction value management table 400
The contents of the correction value management table 400 will now be described with reference to FIG. FIG. 9 is a diagram illustrating an example of a correction value management table according to the first embodiment; The correction value management table 400 stores, for each liquid ejection head 69 , a correction value for correcting the amount of liquid ejected from the liquid ejection head 69 (ejection amount).

The correction value management table 400 shown in FIG. 9 stores correction values in association with identification information for identifying the head unit 610 and the liquid ejection heads 69 provided in the head unit 610 . The correction values included in the correction value management table 400 are updated each time the density adjustment process is completed.

Functional Configuration of Printing Device 50 Functions realized by the printing device 50 shown in FIG. A storage unit 5000 is included.

The transmission/reception unit 51 has a function of exchanging various data with the print control device 30 via the dedicated line 9 . The transmitting/receiving unit 51 is implemented by, for example, programs executed by the I/F 550, the ASIC 506, and the CPU 501 shown in FIG.

The receiving unit 52 has a function of receiving user input to the input means (for example, the input area 540b) of the operation panel 540 shown in FIG. The reception unit 52 is implemented by, for example, a program or the like executed by the ASIC 506 and the CPU 501 shown in FIG. The receiving unit 52 is an example of receiving means.

The display control unit 53 has a function of displaying various screens on the operation panel 540 (for example, the panel display unit 540a) shown in FIG. The display control unit 53 causes the operation panel 540 to display, for example, an operation screen for receiving an input operation by the user, using a WEB browser. The display control unit 53 causes the operation panel 540 to display a Web page such as HTML, for example. The display control unit 53 is realized by, for example, the operation panel 540 shown in FIG. 6, and programs executed by the ASIC 506 and the CPU 501 . The display control unit 53 is an example of output means.

The print control unit 54 has a function of controlling the operation of printing an image on a recording object based on the image data transmitted from the print control device 30 . The print control unit 54, for example, controls print timing of data transmitted from the print control device 30, and performs print adjustment based on adjustment values set by the user. The print control unit 54 is realized by, for example, programs executed by the printer unit 520, the ASIC 506, and the CPU 501 shown in FIG. The print control unit 54 is an example of output means.

The reading control unit 55 is a function that controls reading of data by the scanner unit 530 . For example, the reading control unit 55 reads image data printed by the printing control unit 54 using the scanner unit 530 to obtain a read image. The reading control unit 55 is implemented by, for example, programs executed by the scanner unit 530, the ASIC 506, and the CPU 501 shown in FIG. The reading control unit 55 is an example of reading means.

The storage/readout unit 56 has a function of storing various data in the storage unit 5000 or reading out various data from the storage unit 5000 . The storage/readout unit 56 is implemented by, for example, a program or the like executed by the ASIC 506 and the CPU 501 . The storage unit 5000 is implemented by, for example, the MEP-P502, MEM-C507 or HD509 shown in FIG.

●Processing or Operation in First Embodiment Next, a density adjustment method in the print processing system according to the first embodiment will be described with reference to FIGS. 10 to 18. FIG. FIG. 10 is a sequence diagram showing an example of density adjustment processing in the print processing system according to the first embodiment.

In step S11, the reception unit 52 of the printing device 50 receives input of a density adjustment request from the user. Specifically, the user performs input for starting density adjustment on the operation screen displayed on the operation panel 540 by the display control unit 53 . Accepting unit 52 accepts an input to the operation screen displayed on operation panel 540 .

Here, an operation screen displayed on the operation panel 540 of the printing apparatus 50 will be described with reference to FIG. 11 . FIG. 11 is a diagram illustrating an example of an operation screen displayed on the printing apparatus according to the first embodiment;

An operation screen 700 shown in FIG. 11A is displayed on the operation panel 540 when the printing apparatus 50 is activated, for example. The operation screen 700 includes a selection icon 701 for requesting print processing and a selection icon 702 for requesting density adjustment processing. When the operator's input to the selection icon 701 is accepted, the printing apparatus 50 executes print processing for a predetermined recording object. On the other hand, when the operator's input to the selection icon 702 is accepted, the printing apparatus 50 performs density adjustment processing for an image formed by the liquid ejected from the liquid ejection head 69 .

FIG. 11B shows an example of a setting screen 710 for setting parameters used for density adjustment. A setting screen 710 shown in FIG. 11B is a screen displayed on the operation panel 540 when an input to the selection icon 702 on the operation screen 700 is accepted. The setting screen 710 includes a threshold setting area 711 for setting a threshold for density for determining whether or not to perform density adjustment, and a paper size setting area for receiving selection of the size of paper for recording an image printed by the printing apparatus 50. 713 included. The setting screen 710 also includes an “OK” icon 716 that is pressed to start the density adjustment process, and a “cancel” icon 718 that is pressed to cancel the density adjustment process.

The threshold setting area 711 has a setting area 712 in which a threshold can be set for detecting the density difference between pixels of the image formed on the recording object. The user sets a desired threshold by inputting a predetermined threshold in a setting area 712 included in the threshold setting area 711 . Note that the threshold value setting area 711 may be of a selection form that allows the user to select a numerical value, or may be of an input format that allows the user to directly input a numerical value.

The paper size setting area 713 has a setting area 714 in which the paper size of the paper (recording object) on which the image data is printed using the printing apparatus 50 can be set. The user sets the paper size by inputting a predetermined paper size in a setting area 714 included in the paper size setting area 713 . It should be noted that the paper size setting area 713 may be of a selection form that allows the user to select the paper size, or may be of an input format that allows the user to directly input the paper size.

The printing apparatus 50 accepts a density adjustment request for each liquid ejection head 69 when an input to the “OK” icon 716 is accepted while numerical values are entered in the setting areas 712 and 714 .

Note that the parameters that can be set using the setting screen 710 are not limited to these, and include the head unit 610 that performs density adjustment processing, detailed settings for print processing in the printing apparatus 50 (double-sided/single-sided printing, aggregation, etc.), and the like. may

In step S12, when the receiving unit 52 receives the density adjustment request, the print control unit 54 of the printing device 50 uses the printer unit 520 to print the adjustment chart 70 used for performing the density adjustment process. do. The printing apparatus 50 pre-stores print parameters for printing the adjustment chart 70 in the storage unit 5000 . The print control unit 54 reads out the print parameters stored in the storage unit 5000 via the storage/readout unit 56 to execute the adjustment chart printing process. In step S<b>13 , the reading control unit 55 of the printing device 50 uses the scanner unit 530 to read the printed adjustment chart 70 . The printing process in the print control unit 54 and the reading process in the reading control unit 55 are executed as a series of processing operations.

In step S<b>14 , the transmission/reception unit 51 of the printing device 50 transmits the read data of the adjustment chart 70 read by the reading control unit 55 to the print control device 30 . The transmission/reception unit 31 of the print control device 30 receives the read data transmitted from the printing device 50 .

FIG. 12 is a diagram illustrating an example of an adjustment chart printed by the printing apparatus according to the first embodiment; The horizontal direction of the adjustment chart 70 indicates the direction in which the liquid ejection heads 69 are arranged, and the vertical direction indicates the direction in which the paper is conveyed and the gradation of the image.

In FIG. 12, the horizontal direction of the adjustment chart 70 corresponds to the print area (liquid ejection area) of each of head_1 to head_5. Here, it is assumed that head_1 to head_5 correspond to the liquid ejection heads 69K_1 to 69K_5 in FIG. As shown in FIG. 12, since there are variations in the gradation-density characteristics of the individual heads_1 to head_5, the print result of the adjustment chart 70 will have density unevenness. Therefore, the print processing system 2 needs to perform a correction operation to make the print density uniform among the liquid ejection heads 69 and correct the variation in the image density. Note that the adjustment chart 70 is not limited to the image based on the liquid ejected from the head_1 to head_5. Gradation-density characteristics differ from head to head and are often not linear over the entire gradation area. Therefore, it is preferable to print the adjustment chart 70 over the full width of the head unit 610 and acquire data for a plurality of gradations.

In step S<b>15 , the density calculation unit 33 of the print control device 30 calculates the image density of the adjustment chart 70 based on the read data of the adjustment chart 70 received by the transmission/reception unit 31 . The density calculator 33 converts read data in RGB format into density. As shown in FIG. 13A, the brightness (darkness) of an image is determined by how much the applied liquid (ink) exists in a predetermined area, for example, how much it exists in one pixel. depends on whether FIG. 13B shows an image of the adjustment chart actually printed on paper. As shown in FIGS. 13A and 13B, bright portions of the image have small halftone dots, and dark portions of the image have large halftone dots.

FIG. 13(c) shows the value of the 8-bit R component when the image data is read. It can be seen from FIG. 13C that the density of the read image varies between the maximum value (56) and the minimum value (20). Therefore, the density calculation unit 33 calculates the density of the read data by collectively performing calculations on a plurality of pixels. In the following description, it is assumed that the density calculator 33 converts the RGB values of read data into 8-bit density (luminance data).

In step S<b>16 , the correction value calculator 34 of the print control device 30 uses the density calculated by the density calculator 33 to calculate the correction value for each liquid ejection head 69 .

In step S<b>17 , the data generator 32 of the print control device 30 generates correction data to be printed by the printer 50 based on the correction values calculated by the correction value calculator 34 .

In step S<b>18 , the transmission/reception section 31 of the print control device 30 transmits the correction data generated by the data generation section 32 to the printing device 50 . Then, the transmission/reception unit 51 of the printing device 50 receives the correction data transmitted from the printing control device 30 .

In step S<b>19 , the print control unit 54 of the printing device 50 executes print processing of the correction chart 80 that has undergone density correction based on the correction data received by the transmission/reception unit 51 . In step S20, the reading control unit 55 of the printing device 50 uses the scanner unit 530 to read the printed correction chart 80 (an example of the reading step). Note that the print processing in the print control unit 54 and the read processing in the read control unit 55 are executed in a series of processing operations in the same manner as described above. The correction chart 80 is an example of a read image.

In step S<b>21 , the transmission/reception unit 51 of the printing device 50 transmits the read data of the correction chart 80 read by the reading control unit 55 to the print control device 30 . The transmission/reception unit 31 of the print control device 30 receives the read data transmitted from the printing device 50 .

FIG. 14 is a diagram showing an example of a correction chart printed by the printing apparatus according to the first embodiment. The correction chart 80 shown in FIG. 14 corresponds to the same printing area (liquid ejection area) as the adjustment chart 70 shown in FIG.

Here, as in FIG. 12, head_1 to head_5 correspond to the liquid ejection heads 69K_1 to 69K_5 in FIG. A correction chart 80 shown in FIG. 14 is obtained by correcting variations in gradation-density characteristics of head_1 to head_5 from the adjustment chart 70 shown in FIG. On the other hand, in the correction chart 80 shown in FIG. 14, density unevenness remains in the area between head_2 and head_3.

However, in the conventional confirmation method of the correction result, since the user visually confirms the correction chart 80, it may be difficult to recognize remaining density unevenness. Therefore, the print processing system 2 uses the correction chart 80 in which the image density has been corrected, and performs the following analysis processing, thereby notifying the user of the portion where the density unevenness occurs.

In step S22, the density calculation unit 33 of the print control device 30 calculates the image density of the correction chart 80 based on the read data of the correction chart 80 received by the transmission/reception unit 31 (an example of the calculation step). Note that the density calculation processing in the density calculation unit 33 is the same as the processing in step S15, so the description is omitted.

In step S23, the analysis unit 36 of the print control device 30 analyzes the gradation-density characteristics for each correction chart 80. FIG. Here, the details of the analysis processing of the gradation-density characteristics will be described with reference to FIGS. 15 and 16. FIG. FIG. 15 is a flowchart illustrating an example of correction chart analysis processing in the print control apparatus according to the first embodiment. Here, the analysis processing shown in FIG. 15 is processing for analyzing the densities (brightness data (8-bit data from 0 to 255)) divided for each coordinate shown in FIG. 16(a). FIG. 16(b) shows density values at pixels corresponding to the coordinates shown in FIG. 16(a).

In step S23-1a, the target pixel row processing unit 41 of the analysis unit 36 calculates the total density value in each set target pixel range. Specifically, when the target pixel range is set to 2×2 pixels, the target pixel row processing unit 41 performs a Calculate the total concentration. An example in which the target pixel range is set to 2×2 pixels will be described, but the target pixel range can be set arbitrarily.

In step S23-2a, the target pixel row processing unit 41 calculates an average density value within each set pixel range for each set pixel range. Specifically, as shown in FIG. 16D, the target pixel row processing unit 41 calculates the average density value for each pixel range for which the total value has been calculated. For example, when the target pixel range is 2×2 pixels (4 pixels), the target pixel row processing unit 41 divides the number of pixels (4 pixels) from the total value.

In step S23-3a, the density difference detection unit 42 of the analysis unit 36 calculates the average value for each column with respect to the average value calculated for each set pixel range. Specifically, the density difference detection unit 42 calculates an average value for each row with respect to the average values of the densities of rows A to C shown in FIG. 16(d). Table 1 below shows the average values for each column calculated using the values shown in FIG. 16(d).

In step S23-4a, the density difference detector 42 calculates the density difference between adjacent rows. Specifically, the density difference detection unit 42 calculates, for example, the density difference between rows A and B and the density difference between rows B and C shown in Table 1. In this case, the density difference between the A row and the B row is 0, and the density difference between the B row and the C row is 0.83.

In step S23-5a, if the calculated density difference is greater than or equal to a predetermined threshold value, the density difference detection unit 42 causes the process to proceed to step S23-6a. In step S23-6a, the density difference detection unit 42 identifies columns in which a density difference equal to or greater than a predetermined threshold is detected. Here, the predetermined threshold is a threshold for detecting the density difference that is accepted by the accepting unit 52 of the printing device 50 and set by the setting unit 35 of the print control device 30 . For example, when the threshold value is set to 0.8, the density difference detection unit 42 detects density changes in the B and C columns. Note that the setting unit 35 can set a density detection range for each chart by setting a threshold for detecting a density difference for each chart (for each head unit). Here, the condition regarding the density difference (for example, whether the density difference is equal to or greater than a predetermined threshold) is an example of the predetermined condition. Also, a pixel row having a density difference equal to or greater than a predetermined threshold, that is, a pixel row satisfying a predetermined condition is an example of the second area.

On the other hand, in step S23-5a, if the calculated density difference is smaller than the predetermined threshold value, the density difference detection unit 42 shifts the process to step S23-7a. In step S23-7a, the density difference detection unit 42 terminates the process when all the analysis processes have been completed within the range for which the density adjustment process has been requested. On the other hand, if the analysis processing has not ended, the density difference detection unit 42 repeats the processing from step S23-1a. Here, a pixel row whose density difference is smaller than a predetermined threshold value, that is, a pixel row that does not satisfy a predetermined condition is an example of the first area.

In step S23-5a, the density difference detection unit 42 determines whether the calculated density difference is equal to or greater than the predetermined threshold, but the present invention is not limited to this. For example, the density difference detection unit 42 may be configured to determine whether the calculated density difference is greater than a predetermined threshold. Further, when the predetermined threshold value indicates a predetermined numerical range, the density difference detection section 42 may be configured to determine whether the calculated density difference is within the predetermined numerical range, for example.

Returning to FIG. 10, the description of the density adjustment process in the print processing system 2 is continued. In step S<b>24 , the data generation unit 32 of the print control device 30 generates analysis data for outputting the analysis result of the analysis unit 36 . Specifically, the data generation unit 32 generates the visual information 91a for distinguishing the pixel row from other pixel rows in association with the pixel row for which the density difference is detected by the density difference detection unit 42 in step S21. is given to the read data of the correction chart 80 received by. The analysis data generated by the data generator 32 includes the read data of the correction chart 80 shown in FIG. 14 and the visual information 91a. Note that the analysis data does not necessarily include all the read data of the correction chart 80, and the image of the pixel row in which the density difference is detected and the pixel row in which the density difference is not detected are used so that the user can visually check the density unevenness. at least a part of the image of the column.

In step S<b>25 , the transmission/reception section 31 of the print control device 30 transmits the analysis data generated by the data generation section 32 to the printing device 50 . The transmitting/receiving unit 51 of the printing device 50 receives the analysis data transmitted from the printing control device 30 .

In step S26, the print control unit 54 of the printing device 50 executes print processing of the analysis data received by the transmission/reception unit 51 (an example of an output step). 17 is a diagram illustrating an example of an analysis chart printed by the printing apparatus according to the first embodiment; FIG. The analysis chart 90a shown in FIG. 17 corresponds to the same printing region (liquid ejection region) as the correction chart 80 shown in FIG. The analysis chart 90 a is a printed matter in which the analysis data received by the transmission/reception unit 51 is printed on a recording object by the print control unit 54 .

The analysis chart 90a includes visual information 91a (for example, "x" marks in FIG. 17) associated with pixel rows in which density unevenness occurs. A user who views the analysis chart 90a printed on the recording object can grasp the area where density unevenness occurs by confirming the area indicated by the visual information 91a. Note that the visual information 91a is not limited to the example shown in FIG. 17, and may be any information that allows the user to gaze at the corresponding area. The visual information 91a may be, for example, other symbols such as "o", color coding, comments, or the like.

In step S27, when the analysis chart 90a is printed by the print control unit 54, the display control unit 53 of the printing device 50 displays the evaluation result confirmation screen 750a for receiving feedback on the density adjustment result from the operation panel. 540 to display. The evaluation result confirmation screen 750a shown in FIG. 18 is a confirmation screen for allowing the user who has confirmed the printed analysis chart 90a to select whether or not there is any problem in the result of the density adjustment.

In step S28, when the accepting unit 52 of the printing device 50 accepts selection of the "YES" icon 751a on the evaluation result confirmation screen 750a shown in FIG. 18, the process proceeds to step S29. In step S<b>29 , the transmission/reception unit 51 of the printing device 50 transmits a process end notification to the print control device 30 . The transmission/reception unit 31 of the print control device 30 receives the processing result notification transmitted from the printing device 50 .

In step S<b>30 , when the transmission/reception unit 31 receives the processing result notification, the storage/readout unit 37 of the print control device 30 stores the correction values calculated in step S<b>16 in the correction value management table 400 .

On the other hand, in step S28, when the accepting unit 52 accepts selection of the "NO" icon 752a on the evaluation result confirmation screen 750a shown in FIG. 18, the process proceeds to step S12, and the density adjustment process is repeated.

As a result, the print processing system 2 presents to the user the analysis result of the correction chart 80 in which the density of the image formed on the recording object is corrected by the print control device 30, thereby allowing the user to check the image density. efficiency can be improved. In addition, the print processing system 2 outputs the printed matter in a state where the user can easily identify the area where the density difference is detected by the analysis processing by the print control device 30, thereby notifying the user of the portion to be carefully looked at. can be done.

Here, using FIGS. 19 and 20, analysis results by the processing of the analysis unit 36 according to the first embodiment will be described by comparison with scan data having ideal gradation-density characteristics. FIG. 19(a) is an example of scan data (normal image) having ideal gradation-density characteristics, and FIG. 19(b) is scan data (abnormal image) having density unevenness at predetermined locations. be. Compared to the ideal scan data shown in FIG. 19(a), the scan data shown in FIG. 19(b) has uneven density in the section between the 7th to 17th pixel rows. . FIG. 20 shows the density distribution for each pixel row in the scan data (abnormal image) shown in FIG. 19(b). For example, when the threshold value is set to "3" by the setting unit 35, the density difference detection unit 42 of the analysis unit 36 detects density unevenness for the 7th and 17th pixel columns shown in FIG. To detect.

Further, the analysis chart 90a may be configured to output a density characteristic indicating the density calculated by the density calculation unit 33 instead of the specific visual information. FIG. 21 is a diagram showing a modification of the analysis chart printed by the printing apparatus according to the first embodiment. The analysis chart 90b shown in FIG. 21 includes visual information 91b representing the density distribution of the image contained in the analysis chart 90b instead of the visual information 91a contained in the analysis chart 90a shown in FIG. This allows the print processing system 2 to use the analysis chart 90b to allow the user to check the density characteristics of the entire image, not just the area where the density difference occurs.

Further, the print processing system 2 may output the analysis chart 90a or the analysis chart 90b (hereinafter referred to as the analysis chart 90 when there is no need to distinguish) by displaying instead of printing. In this case, the display control unit 53 of the printing device 50 can allow the user to immediately check the contents of the analysis chart 90 by displaying it on the operation panel 540 .

Further, the print processing system 2 may be configured so that the output method of the analysis chart 90 can be selected. FIG. 22 is a diagram showing a modification of the operation screen displayed on the printing apparatus according to the first embodiment. The operation screen 730 shown in FIG. 22 includes selection icons 731 and 732 for selecting the output method of the analysis chart 90 . The selection icon 731 is an icon selected when outputting the analysis chart 90a by printing. The selection icon 732 is an icon selected when outputting the analysis chart 90a by display. The user can check the analysis chart 90 using a desired output method by performing an input operation on the operation screen 730 .

Effects of the First Embodiment As described above, the print processing system 2 according to the first embodiment uses the reading control unit 55 of the printing device 50 to read an image formed on a recording object, and read the image. The density calculation unit 33 is used to calculate the density of each pixel row in the image of the read data obtained (read image). Then, if there is a pixel row in the read image that has a density difference greater than or equal to a predetermined threshold value with respect to another pixel row, the print processing system 2 associates the pixel row with the pixel row to It outputs visual information 91a for distinguishing the column from other pixel columns. As a result, the print processing system 2 can clearly inform the user of the area where the density difference occurs in the image formed on the recording object, thereby improving the efficiency of the user's work of confirming the density of the image. can be made

●Modified example of the first embodiment●
Next, a printing system according to a modification of the first embodiment will be described. The analysis unit 36 of the print control apparatus 30 according to the modification of the first embodiment performs analysis and evaluation of image density based on variations (dispersion) in density over the entire image, instead of density differences between pixels. 23 is a diagram illustrating an example of a detailed functional configuration of an analysis unit in a print control device according to a modification of the first embodiment; FIG. In the modification of the first embodiment, the analysis section 36 has a density variation detection section 43 instead of the density difference detection section 42 . The density variation detection unit 43 has a function of detecting variations in image density in the read data received by the transmission/reception unit 31 .

Next, analysis processing of the correction chart 80 according to the modification of the first embodiment will be described with reference to FIGS. 24 and 25. FIG. FIG. 24 is a flowchart illustrating an example of correction chart analysis processing in the print control apparatus according to the modification of the first embodiment. Note that the processes of steps S23-1b and S23-2b are the same as the processes of steps S23-1a and S23-2a shown in FIG. 15, and therefore description thereof is omitted.

In step S23-3b, the target pixel row processing unit 41 of the analysis unit 36 calculates the average value of all pixels in the image of the read data. Specifically, the target pixel row processing unit 41 calculates the average value of the densities of all the pixels shown in FIG. 16(d). In the case of FIG. 16(d), the average value of all pixels is 5.277.

In step S23-4b, the density variation detection unit 43 of the analysis unit 36 calculates the density deviation in each set target pixel range. Specifically, first, for each target pixel range, the density variation detection unit 43 calculates the average value of the density in the range and the average value (5.27) of all pixels. Next, the density variation detection unit 43 calculates the density deviation in the range from the calculated average value and the density difference in the target pixel range. For example, the average value in the upper left range of FIG. be. Also, for example, the average value in the lower right range of FIG. 16(d) is "(6.25+5.27)/2=5.7635". The deviation in the range is "5.7635-6.25=-0.4865".

In step S23-5b, the density variation detection unit 43 calculates the root mean square σ of the density deviation calculated for each target pixel range. For example, the root mean square σ in the upper left range of FIG. 16(d) is "(0.1385) ² =0.0192". Also, for example, the root mean square σ in the lower right range of FIG. 16(d) is “(−0.4865) ² =0.2366”.

In step S23-6b, the density variation detection unit 43 calculates 3σ using the calculated root mean square σ. FIG. 25 shows the calculated 3σ values for each target pixel range.

In step S23-7b, the density variation detection unit 43 calculates the average value for each column of the 3σ values calculated for each target pixel range. Specifically, the density variation detection unit 43 calculates an average value for each column with respect to the values of 3σ in columns A to C shown in FIG. Table 2 below shows average values for each column calculated using the values shown in FIG.

In step S23-8b, if there is a column in which the calculated average value of 3σ is equal to or greater than a predetermined threshold value, the density variation detection unit 43 shifts the process to step S23-9b. In step S23-9b, the density variation detection unit 43 identifies columns in which density variations equal to or greater than a predetermined threshold are detected. Here, the predetermined threshold is a threshold for detecting density variations that is received by the receiving unit 52 of the printing device 50 and set by the setting unit 35 of the print control device 30 .

For example, when the threshold value is set to 0.45, the density variation detection unit 43 detects density variation in the C column. Density variation increases as the value of 3σ increases. Note that the setting unit 35 can set a permissible range of density variation for each chart by setting a threshold for detecting density variation for each chart (for each head unit). A threshold for detecting density variation is an example of a predetermined condition. Here, the condition regarding the density variation (for example, whether the density variation is equal to or greater than a predetermined threshold) is an example of the predetermined condition. Also, a pixel row whose density variation is equal to or greater than a predetermined threshold, that is, a pixel row that satisfies a predetermined condition is an example of the second area.

On the other hand, in step S23-8b, if the calculated average value of 3σ is smaller than the predetermined threshold value, the density variation detection unit 43 shifts the process to step S23-10b. In step S23-10b, the density variation detection unit 43 ends the process when all the analysis processes have been completed within the range for which the density adjustment process has been requested. On the other hand, if the analysis processing has not ended, the density variation detection unit 43 repeats the processing from step S23-1b. Here, a pixel row whose density variation is smaller than a predetermined threshold, that is, a pixel row that does not satisfy a predetermined condition is an example of the first region.

Here, with reference to FIG. 26, the analysis result by the processing of the analysis unit 36 according to the modification of the first embodiment will be described by comparison with scan data having ideal tone-density characteristics. FIG. 26A shows an example of density variation of scan data (normal image) having ideal gradation-density characteristics, and FIG. image) is an example of density variation. 26(a) and 26(b), the pixel columns on the horizontal axis are numerical values obtained by grouping five pixels together, and the vertical axis is the variance value (3σ) of the average of the corresponding five pixels. It can be seen that the density characteristic shown in FIG. 26(b) has a greater variation in density for each pixel row than the ideal scan data shown in FIG. 26(a). For example, when the setting unit 35 sets the threshold value to "7.0", the density variation detection unit 43 of the analysis unit 36 detects density unevenness in the 9th to 11th pixel rows.

As described above, the print processing system according to the modification of the first embodiment can clearly inform the user of the pixel rows with large density variations in the image formed on the recording object. The efficiency of confirming image density can be improved.

●Second Embodiment●
Next, a printing system according to the second embodiment will be described. In addition, the same reference numerals are given to the same configurations and the same functions as those of the first embodiment, and the description thereof will be omitted. The print processing system according to the second embodiment performs image density analysis processing by the analysis unit 36 not only on the correction chart 80, but also on a chart before image density correction (for example, the adjustment chart 70). This configuration is also applicable to

FIG. 27 is a sequence diagram showing an example of density adjustment processing in the print processing system according to the second embodiment. In step S51, the reception unit 52 of the printing device 50 receives input of a density adjustment request from the user. Specifically, the user selects selection icon 702 and “OK” icon 716 on operation screen 700 (see FIG. 11 ) displayed on operation panel 540 by display control unit 53 . Accepting unit 52 accepts inputs for selection icon 702 and “OK” icon 716 included in operation screen 700 displayed on operation panel 540 .

In step S52, when the receiving unit 52 receives the density adjustment request, the print control unit 54 of the printing device 50 uses the printer unit 520 to print the adjustment chart 70 used for performing the density adjustment process. do. The printing apparatus 50 pre-stores print parameters for printing the adjustment chart 70 in the storage unit 5000 . The print control unit 54 reads out the print parameters stored in the storage unit 5000 via the storage/readout unit 56 to execute the adjustment chart printing process.

In step S53, the reading control unit 55 of the printing device 50 uses the scanner unit 530 to read the printed adjustment chart 70 (an example of the reading step). The printing process in the print control unit 54 and the reading process in the reading control unit 55 are executed as a series of processing operations.

In step S<b>54 , the transmission/reception unit 51 of the printing device 50 transmits the read data of the adjustment chart 70 read by the reading control unit 55 to the print control device 30 . The transmission/reception unit 31 of the print control device 30 receives the read data transmitted from the printing device 50 .

In step S55, the density calculator 33 of the print control device 30 calculates the image density of the adjustment chart 70 based on the read data received by the transmitter/receiver 51 (an example of a calculation step). The details of the processing by the density calculation unit 33 are the same as the processing in step S15 shown in FIG. 10, so the description is omitted.

In step S56, the analysis unit 36 of the print control device 30 analyzes the gradation-density characteristics of the adjustment chart 70 based on the image density calculated by the density calculation unit 33. FIG. Since the processing contents of the analysis processing by the analysis unit 36 are the same as the processing shown in FIG. 15, description thereof is omitted.

In step S<b>57 , the data generation unit 32 of the print control device 30 generates analysis data for outputting the analysis result of the analysis unit 36 . Specifically, the data generation unit 32 assigns specific visual information in association with the pixel row in which the density difference detection unit 42 detects a density change.

In step S<b>58 , the transmission/reception section 31 of the print control device 30 transmits the analysis data generated by the data generation section 32 to the printing device 50 . The transmitting/receiving unit 51 of the printing device 50 receives the analysis data transmitted from the printing control device 30 .

In step S59, the print control unit 54 of the printing device 50 executes print processing of the analysis data received by the transmission/reception unit 51 (an example of an output step). In step S60, when the analysis chart 90 is printed by the print control unit 54, the display control unit 53 of the printing device 50 displays the evaluation result confirmation screen 750b for accepting the user's selection as to whether or not the density adjustment process is necessary. , is displayed on the operation panel 540 . The evaluation result confirmation screen 750b shown in FIG. 28 is a confirmation screen for the user who has confirmed the printed analysis chart 90 to select whether or not the density adjustment process is necessary.

In step S60, when the accepting unit 52 of the printing device 50 accepts selection of the "YES" icon 751b on the evaluation result confirmation screen 750b shown in FIG. 28, the process proceeds to step S62. In step S<b>62 , the transmission/reception unit 51 of the printing device 50 transmits a density adjustment request to the printing control device 30 . The density adjustment request may include information on the chart (head unit 610) requesting the density adjustment process selected by the user. As a result, the transmission/reception unit 31 of the print control device 30 receives the density adjustment request transmitted from the printing device 50 .

In step S63, when receiving the density adjustment request, the print control device 30 performs density adjustment processing using the read data of the adjustment chart 70 received in step S54. Since the density adjustment processing in this case is the same as the processing after step S15 shown in FIG. 10, the description thereof is omitted. Note that if the density adjustment request includes information on a chart (head unit 610) requesting density adjustment processing, the print control device 30 will set the density for the requested chart (head unit 610). The configuration may be such that adjustment processing is performed.

On the other hand, in step S61, when the reception unit 52 of the printing device 50 receives selection of the "NO" icon 752b on the evaluation result confirmation screen 750b shown in FIG. exit.

Effect of the Second Embodiment As described above, the print processing system according to the second embodiment performs the image density analysis processing by the analysis unit 36 based on the chart (for example, adjustment) before image density correction. By using the chart 70), the user who visually confirms the analysis result is allowed to select whether or not to correct the image density. As a result, the print processing system according to the second embodiment does not perform the density adjustment process when the user visually checks the printed matter on which the analysis chart 90 is printed and determines that the density adjustment process does not need to be performed. Therefore, it is possible to reduce the time and processing load required for density adjustment processing.

●Summary●
As described above, the print processing system 2 (an example of an image forming processing system) according to an embodiment of the present invention reads an image formed on a recording object by the printing apparatus 50 (an example of an image forming apparatus). A control unit 55 (an example of a reading unit), a density calculation unit 33 (an example of a calculation unit) that calculates the density for each pixel row (an example of a predetermined area) in a read image, and a predetermined If there is a pixel row that satisfies the condition, the image of the pixel row that does not satisfy the condition (an example of the first region), the image of the pixel row that satisfies the condition (an example of the second region), and the pixel row that satisfies the condition display control unit 53 or print control unit 54 (an example of output means) for outputting visual information 91a associated with.

As a result, the print processing system 2 can clearly notify the user of the area in which the density unevenness occurs in the image formed on the recording object, thereby improving the efficiency of the user's work of confirming the density of the image. can be made

Further, in the print processing system 2 (an example of an image forming processing system) according to an embodiment of the present invention, the display control unit 53 or the print control unit 54 (an example of an output unit) is configured so that the density difference between the other pixel columns is If there is a row of pixels equal to or greater than a predetermined threshold, visual information 91a associated with the row of pixels (an example of a second region) is output. As a result, the print processing system 2 can allow the user to easily determine, using the visual information 91a, an area having a large density difference from other areas in the image formed on the recording object. concentration can be improved.

Further, in the print processing system 2 (an example of an image forming processing system) according to an embodiment of the present invention, the display control unit 53 or the print control unit 54 (an example of an output unit) is configured so that the density variation in the read image reaches a predetermined value. If there is a pixel row equal to or greater than the threshold, visual information 91a associated with the pixel row (an example of the second region) is output. As a result, the print processing system 2 can allow the user to easily determine, using the visual information 91a, an area in the image formed on the recording object that has large variations in density from other areas. The efficiency of confirming image density can be improved.

Also, in the print processing system 2 (an example of the image forming processing system) according to one embodiment of the present invention, the visual information 91b is information regarding the density distribution of the read image read by the read control section 55 . As a result, the print processing system 2 allows the user to check the density characteristics of the entire image, not just the area where the density difference or density variation occurs in the image formed on the recording object.

Further, the print processing system 2 (an example of an image forming processing system) according to an embodiment of the present invention includes a correction value calculation unit 34 ( An example of correction means). Then, the reading control unit 55 (an example of reading means) reads the corrected correction chart 80 (an example of the corrected image), and the density calculating unit 33 (an example of the calculating means) reads the read correction chart 80 to a predetermined value. A density is calculated for each pixel row (an example of a predetermined area). As a result, the print processing system 2 presents the user with the analysis result of the correction chart 80 in which the image density has been corrected, thereby improving the efficiency of the user's confirmation of the image density.

Further, the print processing system 2 (an example of an image forming processing system) according to an embodiment of the present invention includes a reception unit 52 (an example of reception means) that receives selection of an output method for specific visual information 91a. is printing or display, and the display control unit 53 or the print control unit 54 (an example of output means) outputs the visual information 91a using the selected output method. As a result, the print processing system 2 can allow the user to confirm the analysis result by the print control device 30 in a desired format.

Further, the density adjustment method executed by the print processing system 2 (an example of an image forming processing system) according to an embodiment of the present invention includes a reading step of reading an image formed by a printing device 50 (an example of an image forming device). , a calculation step of calculating the density for each predetermined pixel row (an example of a predetermined area) of the read image; and an output step of outputting an image of a column (an example of a first region), an image of a pixel column that satisfies the condition (an example of a second region), and visual information 91a associated with the pixel column that satisfies the condition. . As a result, the print processing system 2 can clearly inform the user of the area where the density difference occurs in the image formed on the recording object, thereby improving the efficiency of the user's work of confirming the density of the image. can be made

Furthermore, the printed matter on which the image is formed by the printing apparatus 50 (an example of the image forming apparatus) according to one embodiment of the present invention is associated with the area where the density unevenness occurs in the formed image, and the density unevenness occurs. Visual information 91a is printed to distinguish the area where the image is present from other areas. As a result, the printed matter according to the embodiment of the present invention allows the user to easily determine the area where density unevenness occurs in the printed image using the visual information 91a. The efficiency of confirmation work can be improved.

● Supplement ●
In each embodiment of the present invention, the recording target is not limited to paper, and may be any material to which liquid can adhere at least temporarily. The object to be recorded is an object to which liquid adheres and adheres, or an object to which liquid adheres and permeates. The recording object is, for example, recording paper, recording paper, media such as film or cloth, electronic components such as electronic substrates or piezoelectric elements, or media such as powder layers (powder layers), organ models or test cells. may include anything that liquid may adhere to. Also, the material of the recording object may be paper, thread, fiber, cloth, leather, metal, plastic, glass, wood, ceramics, or any other material to which liquid can adhere even temporarily.

In addition, in each embodiment of the present invention, the liquid output from the liquid ejection head 69 may have a viscosity and surface tension that can be output from the liquid ejection head 69 . The liquid is not particularly limited, but preferably has a viscosity of 30 mPa·s or less at normal temperature and pressure, or when heated or cooled. More specifically, the liquid is a solvent such as water or an organic solvent, a coloring agent such as a dye or pigment, a polymerizable compound, a functional imparting material such as a resin or a surfactant, DNA, an amino acid, a protein, or calcium. solution, suspension, or emulsion containing a biocompatible material such as a natural pigment, an edible material such as a natural pigment, or the like. These can be used, for example, as inkjet inks, surface treatment liquids, constituent elements of electronic elements or light-emitting elements, liquids for forming electronic circuit resist patterns, material liquids for three-dimensional modeling, and the like. Furthermore, in each embodiment of the present invention, the liquid ejection head 69 includes one that ejects liquid, one that ejects liquid, one that applies liquid, and the like.

The functions of each embodiment of the present invention can be realized by computer-executable programs written in legacy programming languages such as assembler, C, C++, C#, Java (registered trademark), object-oriented programming languages, etc. Programs for executing the functions of each embodiment can be distributed through telecommunication lines.

Programs for executing the functions of each embodiment of the present invention include ROM, EEPROM (Electrically Erasable Programmable Read-Only Memory), EPROM (Erasable Programmable Read-Only Memory), flash memory, flexible disk, CD (Compact Disc)-ROM, CD-RW (Re-Writable), DVD-ROM, DVD-RAM, DVD-RW, Blu-ray disc, SD card, MO (Magneto-Optical disc), etc. It can also be distributed.

Furthermore, some or all of the functions of each embodiment of the present invention can be implemented on a programmable device (PD) such as an FPGA (Field Programmable Gate Array), or can be implemented as an ASIC, Circuit configuration data (bit stream data) downloaded to the PD to realize the functions of each embodiment on the PD, HDL (Hardware Description Language) for generating circuit configuration data, VHDL (Very High Speed Integrated Circuits Hardware Description) Language), Verilog-HDL, etc. can be distributed on a recording medium.

The image forming processing system, density adjustment method, program, and printed matter according to one embodiment of the present invention have been described so far, but the present invention is not limited to the above-described embodiment, and other embodiments can be added. , change or deletion, etc., can be changed within the range that a person skilled in the art can conceive, and as long as the action and effect of the present invention are exhibited in any aspect, it is included in the scope of the present invention.

1 printing system 2 printing processing system (an example of an image forming processing system)
10 communication terminal 30 print control device (an example of an image formation control device)
33 Concentration calculation unit (an example of calculation means)
34 Correction value calculator (an example of correction means)
36 analysis unit 41 target pixel row processing unit 42 density difference detection unit 43 density variation detection unit 50 printing device (an example of an image forming device)
52 reception unit (an example of reception means)
53 Display control unit (an example of output means)
54 print control unit (an example of output means)
55 reading control unit (an example of reading means)

JP 2018-008483 A

Claims (11)

reading means for reading an image formed on a recording object by the image forming apparatus;
a calculating means for calculating the density of each predetermined area in the read image read by the reading means ;
When there are areas where the density calculated by the calculating means satisfies a predetermined condition, an image of a first area that does not satisfy the condition, an image of a second area that is an area that does not satisfy the condition, and an image of the second area that does not satisfy the condition; output means for outputting visual information associated with the second region;
with
the visual information includes information about the density distribution of the image;
An image forming processing system in which the visual information is associated with the full width of the image and a plurality of gradation values, and a plurality of the visual information is output for each of the gradation values. the predetermined condition is a condition related to the density of the read image ;
When there is an area in which the density difference between the image density of the first area and the image density of the second area is equal to or greater than a predetermined threshold value, the output means outputs the second area which is the area. 2. The image forming processing system according to claim 1, wherein said visual information is output in association with an area. the predetermined condition is a condition relating to variations in density in the image;
2. The image forming method according to claim 1, wherein when there is an area in which the variation is greater than or equal to a predetermined threshold, the output means outputs the visual information in association with the second area, which is the area. processing system. 4. The apparatus according to any one of claims 1 to 3, wherein said visual information is information added to said read image in order to distinguish an image of said second area from an image of said first area. The described imaging processing system. 5. The image forming processing system according to claim 1, wherein said predetermined area is an area obtained by dividing said image for each predetermined pixel row. The image forming processing system according to any one of claims 1 to 5 ,
a correction means for correcting the density of the image formed by the image forming apparatus;
The reading means reads the corrected image corrected by the correcting means ,
The image forming processing system, wherein the calculating means calculates the density of each predetermined area of the corrected image read by the reading means . The image forming processing system according to any one of claims 1 to 6 , further comprising:
a receiving means for receiving a selection of the output method of the visual information;
The output method is printing or display,
The image forming processing system, wherein the output means outputs the visual information using the output method for which the selection has been accepted. The image forming processing system according to any one of claims 1 to 7 ,
the image forming apparatus;
an image forming control device connected to the image forming device and controlling image formation in the image forming device;
An image forming processing system comprising: An image density presentation method executed by an image forming processing system,
a reading step of reading an image formed by an image forming apparatus;
a calculation step of calculating the density of each predetermined area of the read image read by the reading step ;
If there are areas where the density calculated by the calculating step satisfies a predetermined condition, the image of the first area that does not satisfy the condition, the image of the second area that does not satisfy the condition, the image of the second area that satisfies the condition, and the second area. an output step that outputs the associated visual information;
and
the visual information includes information about the density distribution of the image;
The image density presentation method , wherein the visual information is associated with the full width of the image and a plurality of gradation values, and a plurality of the visual information is output for each of the gradation values. A program for causing a computer to execute the image density presentation method according to claim 9 . A printed matter on which an image is formed by an image forming apparatus,
printing visual information associated with a region in which density unevenness occurs in the image for distinguishing the region from other regions ;
the visual information includes information about the density distribution of the image;
A printed matter in which the visual information is associated with the full width of the image and a plurality of gradation values, and a plurality of the visual information is output for each of the gradation values .

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