WO2016199704A1 - Appareil de formation d'image et système de formation d'image - Google Patents

Appareil de formation d'image et système de formation d'image Download PDF

Info

Publication number
WO2016199704A1
WO2016199704A1 PCT/JP2016/066709 JP2016066709W WO2016199704A1 WO 2016199704 A1 WO2016199704 A1 WO 2016199704A1 JP 2016066709 W JP2016066709 W JP 2016066709W WO 2016199704 A1 WO2016199704 A1 WO 2016199704A1
Authority
WO
WIPO (PCT)
Prior art keywords
image
print
gradation
print image
image information
Prior art date
Application number
PCT/JP2016/066709
Other languages
English (en)
Japanese (ja)
Inventor
昌 松尾
Original Assignee
京セラドキュメントソリューションズ株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京セラドキュメントソリューションズ株式会社 filed Critical 京セラドキュメントソリューションズ株式会社
Publication of WO2016199704A1 publication Critical patent/WO2016199704A1/fr

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/525—Arrangement for multi-colour printing, not covered by group B41J2/21, e.g. applicable to two or more kinds of printing or marking process
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/30—Character or syllable selection controlled by recorded information
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/12—Digital output to print unit, e.g. line printer, chain printer
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/46—Colour picture communication systems
    • H04N1/56—Processing of colour picture signals
    • H04N1/60—Colour correction or control

Definitions

  • the present invention relates to an image forming apparatus and an image forming system for reproducing a luminance gradation in an input image in a printed image.
  • CT Computer Tomography
  • MRI Magnetic Resonance Imaging
  • CR Computer Recimulation
  • FPD Freque Panel Detector
  • ultrasonic diagnostic devices are used as digital image generation devices.
  • image display device such as a CRT (Cathode Ray Tube) or output as a print image by an image forming device such as a printer are used.
  • the conventional method has a problem that all process colors need to be used.
  • an object of the present invention is to provide an image forming apparatus and an image forming system that can reduce the types of process colors to be used.
  • the image forming apparatus of the present invention includes: a print image information generation unit that generates print image information for a print image based on an input image; and the print image information generated by the print image information generation unit.
  • a print execution unit for outputting an image wherein the print image information generation unit converts the luminance gradation in the input image into a lightness gradation in a single hue expressed by two or more process colors. Then, the print image information is generated.
  • the image forming apparatus of the present invention converts the luminance gradation in the input image into the lightness gradation in a single hue to generate print image information. Therefore, the print image is generated according to the print image information. It is possible to prevent all process colors from being used when output. Therefore, the image forming apparatus of the present invention can reduce the types of process colors used.
  • the image forming system of the present invention includes a print image information generation unit that generates print image information for a print image based on an input image, and the print image information generated by the print image information generation unit.
  • a print execution unit for outputting an image wherein the print image information generation unit converts the luminance gradation in the input image into a lightness gradation in a single hue expressed by two or more process colors. Then, the print image information is generated.
  • the image forming system of the present invention generates the print image information by converting the luminance gradation in the input image into the lightness gradation in a single hue, so that the print image is generated according to the print image information. It is possible to prevent all process colors from being used when output. Therefore, the image forming system of the present invention can reduce the types of process colors used.
  • the image forming apparatus and the image forming system of the present invention can reduce the types of process colors to be used.
  • FIG. 1 is a block diagram of an image forming system according to a first embodiment of the present invention.
  • FIG. 2 is a block diagram of the MFP shown in FIG. 1.
  • FIG. 3 is a diagram showing a relationship between luminance reproducible on a recording medium by the MFP shown in FIG. 2 and a discrimination threshold.
  • FIG. 4 is a diagram showing a relationship between a luminance based on GSDF defined by DICOM and a discrimination threshold, and is a diagram based on the diagram shown in FIG. 3.
  • FIG. 2 is a block diagram of the print instruction apparatus shown in FIG. 1.
  • 3 is a flowchart of the operation of the MFP shown in FIG. 2 when performing calibration.
  • 3 is a flowchart of the operation of the MFP shown in FIG.
  • FIG. 3 is a diagram showing a hue circle in an L * a * b * color space for the MFP shown in FIG. 2.
  • FIG. 9 is a diagram illustrating the cyan equi-hue surface shown in FIG. 8 when the luminance gradation in the input image is converted into the lightness gradation in the cyan hue. It is a figure which shows the pure color and the clear color in the cyan equal hue surface shown in FIG.
  • FIG. 3 is a diagram showing a relationship between luminance reproducible on a recording medium by the MFP shown in FIG. 2 and pure colors and clear colors on a cyan equal hue plane.
  • FIG. 3 is a diagram illustrating an example of a print image output by the MFP illustrated in FIG. 2. It is a figure which shows an example of the print image as a comparative example with the print image shown in FIG. 10 is a flowchart of the operation of the print instruction apparatus according to the second embodiment of the present invention when instructing the MFP to print based on an input image. It is a figure which shows an example of the area
  • FIG. 17 is a flowchart of an area selection operation shown in FIG. 16. FIG.
  • FIG. 16 is a gradation histogram in the image of the region shown in FIG. 15.
  • FIG. 19 is a gradation histogram shown in FIG. 18 after the expansion of the gradation width.
  • FIG. 10 is a diagram illustrating an example of a print image output by an MFP according to a second embodiment of the present invention.
  • FIG. 1 is a block diagram of an image forming system 10 according to the present embodiment.
  • the image forming system 10 includes an MFP (Multifunction Peripheral) 20 as an image forming apparatus and a print instruction apparatus 30 that instructs the MFP 20 to perform printing.
  • the MFP 20 and the print instruction apparatus 30 are communicably connected via a network 11 such as a LAN (Local Area Network) or the Internet, or directly connected by a cable such as a USB (Universal Serial Bus) cable or wireless communication. ing.
  • a network 11 such as a LAN (Local Area Network) or the Internet
  • a cable such as a USB (Universal Serial Bus) cable or wireless communication.
  • FIG. 2 is a block diagram of the MFP 20.
  • the MFP 20 includes an operation unit 21 that is an input device such as buttons for inputting various operations, and a display unit 22 that is a display device such as an LCD (Liquid Crystal Display) that displays various information.
  • a scanner 23 that is a reading device that reads data from a document
  • a printer 24 that is a printing device that executes printing on a recording medium such as paper, and a photo for detecting the color density of an image printed by the printer 24
  • a sensor 25 a fax communication unit 26, which is a fax device that performs fax communication with an external facsimile apparatus (not shown) via a communication line such as a public telephone line, and the print instruction apparatus 30 via the network 11 (see FIG. 1).
  • Communication devices that communicate with external devices A communication unit 27 is a scan, a semiconductor memory that stores various data, an HDD (Hard Disk Drive) storage unit 28 is a storage device such as, and a control unit 29 which controls the entire MFP 20.
  • HDD Hard Disk Drive
  • the MFP 20 replaces the device for connecting directly to the print instruction apparatus 30 with a cable such as a USB cable, or the device for connecting directly to the print instruction apparatus 30 with wireless communication, in place of the communication unit 27 or In addition to the communication unit 27, the communication unit 27 may be provided.
  • the printer 24 is an electrophotographic printing device. There are four types of process colors of the printer 24: cyan, magenta, yellow, and black.
  • the storage unit 28 stores an image processing program 28a for generating print image information for a print image based on the input image.
  • the image processing program 28 a may be installed in the MFP 20 at the manufacturing stage of the MFP 20, may be additionally installed in the MFP 20 from a storage medium such as an SD card or a USB memory, or may be added to the MFP 20 from the network 11. May be installed.
  • the storage unit 28 stores a gamma correction table 28b for correcting the halftone output characteristics of the printer 24 for each type of process color.
  • the control unit 29 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory) storing programs and various data, and a RAM (Random Access Memory) used as a work area of the CPU. Computer.
  • the CPU executes a program stored in the ROM or the storage unit 28.
  • the control unit 29 executes the image processing program 28a stored in the storage unit 28, thereby generating print image information generation unit 29a that generates print image information for the print image based on the input image, and the print image It functions as a print execution unit 29b that outputs a print image according to the print image information generated by the information generation unit 29a.
  • FIG. 3 is a diagram showing the relationship between the luminance L reproducible on the recording medium by the MFP 20 and the discrimination threshold JND (Just Notifiable Difference).
  • FIG. 4 is a diagram illustrating the relationship between the luminance L based on GSDF (Grayscale Standard Display Function) defined by DICOM (Digital Imaging and Communication in Medicine) and the discrimination threshold JDN. 3 is a diagram in which a part of the diagram shown in FIG. 4 is extracted.
  • GSDF Gramyscale Standard Display Function
  • DICOM Digital Imaging and Communication in Medicine
  • Medical monitors typically have a typical image with a luminance in the range of about 100 cd / m2 to about 200 cd / m2, a mammographic image with a luminance in the range of about 200 cd / m2 to about 800 cd / m2, and an X-ray image about.
  • the brightness is displayed in the range of 300 cd / m 2 to about 400 cd / m 2.
  • the luminance that can be reproduced on the recording medium by the MFP 20 is in the range of 5.8 cd / m 2 to 126.8 cd / m 2. That is, the luminance range that can be reproduced on the recording medium by the MFP 20 is much narrower than the luminance range that can be reproduced by the medical monitor.
  • FIG. 5 is a block diagram of the print instruction apparatus 30.
  • the print instruction apparatus 30 includes an operation unit 31 that is an input device such as a mouse and a keyboard for inputting various operations, and a display unit 32 that is a display device such as an LCD that displays various information.
  • a communication unit 33 that is a communication device that communicates with an external device such as the MFP 20 (see FIG. 1) via the network 11 (see FIG. 1), an HDD that stores programs and various data, and the like.
  • a storage unit 34 that is a storage device and a control unit 35 that controls the entire print instruction apparatus 30 are provided.
  • the print instruction apparatus 30 is configured by a computer such as a PC (Personal Computer).
  • the print instruction apparatus 30 replaces the communication unit 33 with a device for connecting directly to the MFP 20 via a cable such as a USB cable, or a device for connecting directly to the MFP 20 via wireless communication, or a communication unit.
  • a cable such as a USB cable
  • a device for connecting directly to the MFP 20 via wireless communication or a communication unit.
  • the control unit 35 includes, for example, a CPU, a ROM that stores programs and various data in advance, and a RAM that is used as a work area of the CPU.
  • the CPU executes a program stored in the ROM or the storage unit 34.
  • the MFP 20 may change the amount of toner adhering to the recording medium due to changes in temperature, humidity, etc., and the output characteristics may not be desired. Further, when the MFP 20 performs printing continuously for a long time, the output characteristics may not be desired due to the temperature of each part of the printer 24 changing. Further, as a result of the MFP 20 being used for a long period of time, output characteristics may not be desired due to changes in characteristics of each part of the printer 24, such as charging characteristics of the photosensitive drum.
  • the MFP 20 executes calibration as shown in FIG. 6 when a certain environmental change condition such as humidity, temperature, or number of printed sheets is satisfied.
  • FIG. 6 is a flowchart of the operation of the MFP 20 when executing calibration.
  • control unit 29 of the MFP 20 draws an arbitrary screen pattern on the recording medium by the printer 24 for each type of process color (S101).
  • control unit 29 reads the screen pattern drawn on the recording medium in S101 by the photosensor 25 and detects the density (S102).
  • control unit 29 identifies the highest density that can be output by the printer 24 for each type of process color based on the density detected in S102 (S103).
  • control unit 29 recognizes the original data of the screen pattern, the control unit 29 can determine, based on the original data, the region having the highest density among the screen patterns drawn on the recording medium in S101. .
  • control unit 29 generates a gamma correction table for each type of process color based on the density detected in S102 (S104). That is, the control unit 29 generates a gamma correction table in which the output characteristics of the printer 24 become the same as the desired output characteristics, or the output characteristics of the printer 24 approach the desired output characteristics.
  • control unit 29 updates the existing gamma correction table 28b with the gamma correction table generated in S104 (S105).
  • control unit 29 specifies the luminance gradation width that can be reproduced by the printer 24 after the update of the gamma correction table 28b in S105 (S106), and ends the operation shown in FIG.
  • the print instruction device 30 instructs the MFP 20 to print based on the monochrome input image. Then, when the input image output by the print instruction apparatus 30 is input, the MFP 20 executes the operation illustrated in FIG.
  • FIG. 7 is a flowchart of the operation of the MFP 20 when outputting a print image based on the input image.
  • the print image information generation unit 29a of the MFP 20 acquires the luminance information of the input image (S111), and generates a luminance histogram of the input image based on the luminance information acquired in S111 (S112). ).
  • the print image information generation unit 29a specifies the difference between the highest luminance and the lowest luminance in the histogram generated in S112, that is, the luminance gradation width in the input image (S113).
  • the print image information generation unit 29a determines whether or not the width specified in S113 exceeds the width specified in S106, that is, the luminance gradation width reproducible by the printer 24 (S114). .
  • the print image information generation unit 29a determines in S114 that the luminance gradation width that can be reproduced by the printer 24 is not exceeded, the density specified in S103, that is, the highest density that can be output by the printer 24 is determined. It is determined whether the concentration is less than a specific concentration (S115).
  • the specific density may be a fixed density or a density that can be changed via the operation unit 21 or the communication unit 27.
  • the print image information generation unit 29a may set all types of process colors to be determined in S115, or may select only one type of process colors to be determined in S115. For example, since the medical image is normally monochrome, the print image information generation unit 29a may set only black among the process colors as a determination target in S115.
  • the print image information generation unit 29a sets a plurality of types of process colors as the determination target in S115, the density specified in S103 for at least one of the target types is less than the specific density. When it is determined that there is, it may be determined in S115 that the density specified in S103 is less than the specific density, or the density specified in S103 for all the target types is less than the specific density. When it is determined that there is, it may be determined in S115 that the density specified in S103 is less than the specific density.
  • the print image information generation unit 29a determines in S115 that the highest density that can be output by the printer 24 is not less than the specific density, the RGB value of the input image is converted into a CMYK value using a color conversion table (not shown). Conversion is performed (S116).
  • the print image information generation unit 29a determines in S114 that the luminance gradation width that can be reproduced by the printer 24 is exceeded, or if the maximum density that can be output by the printer 24 is less than a specific density in S115. Judging, after converting the RGB values of the input image to the L * a * b * value (S117), L * a * b * gradation of brightness in the input image converted to a value of brightness in a single hue floors The key is converted into a key (S118).
  • FIG. 8 is a diagram showing a hue circle in the L * a * b * color space.
  • FIG. 9 is a diagram showing the cyan equi-hue surface 41 when the luminance gradation in the input image is converted into the lightness gradation in the cyan hue.
  • the print image information generation unit 29a changes the brightness gradation in the input image to the brightness gradation on the cyan equi-hue surface 41 (see FIG. 8) as shown in FIG. Can be converted to
  • the print image information generation unit 29a has a saturation of zero, that is, the color existing on the line segment 40 on the L * axis, while maintaining the lightness, the outermost shell 41a of the cyan equal hue surface 41.
  • the upper color that is, the pure color 41b or the clear color can be converted.
  • FIG. 10 is a diagram showing the pure color 41b and the clear color on the cyan equi-hue surface 41.
  • FIG. FIG. 11 is a diagram showing the relationship between the luminance L that can be reproduced on the recording medium by the MFP 20 and the pure color 41b and the clear color on the cyan equal hue plane 41.
  • the pure color 41b having the highest saturation and the clear color 41c having a lightness higher than the pure color 41b among the clear colors on the cyan equal hue plane 41 are reproduced only by cyan among the process colors. Is possible.
  • the dark clear color 41d having lightness lower than that of the pure color 41b among the clear colors can be reproduced only with cyan and black among the process colors. That is, in S118 shown in FIG. 7, the print image information generation unit 29a converts the luminance gradation in the input image into a cyan hue expressed by two kinds of process colors, cyan and black, as shown in FIG. It can be converted to lightness gradation.
  • the print image information generation unit 29a displays the magenta equal hue plane 42 (see FIG. 8) in which the luminance gradation in the input image is expressed by two types of process colors, magenta and black. ) In the lightness gradation. Further, in S118, the print image information generation unit 29a displays the brightness gradation of the input image in the same hue plane 43 (see FIG. 8) of yellow, which is expressed by two kinds of process colors, yellow and black. It can be converted into gradation.
  • the print image information generation unit 29a includes a region 44 including a blue equi-hue surface with the luminance gradation in the input image sandwiched between the equi-hue surface 41 and the equi-hue surface 42 (FIG. 8). In the same hue plane represented by three kinds of process colors of cyan, magenta, and black.
  • the print image information generation unit 29a includes a region 45 (see FIG. 8) in which the luminance gradation in the input image is sandwiched between the equal hue plane 42 and the equal hue plane 43 and includes the red hue hue. In the same hue plane in the same hue plane expressed by three process colors of magenta, yellow and black.
  • the print image information generation unit 29a includes a region 46 including a green (GREEn) hue plane sandwiched between the equal hue plane 41 and the equal hue plane 43 (see FIG. 8).
  • GREEn green
  • the print image information generation unit 29a converts the luminance gradation in the input image into the lightness gradation in which hue, or via the operation unit 21, the communication unit 27, or the like. It may be changeable.
  • the print image information generation unit 29a converts the L * a * b * value generated in S118 into a CMYK value (S119).
  • the print image information generation unit 29a After the processing of S116, the print image information generation unit 29a performs gamma correction by the gamma correction table 28b on the image information converted into CMYK values in S116, and generates print image information (S120). Therefore, monochrome print image information is generated.
  • the print image information generation unit 29a After the process of S119, the print image information generation unit 29a performs gamma correction by the gamma correction table 28b on the image information converted into CMYK values in S119, and generates print image information (S120). Therefore, the color print image information of a single hue is generated.
  • the print execution unit 29b of the MFP 20 outputs a print image by the printer 24 according to the print image information generated in S120 (S121), and ends the operation shown in FIG.
  • FIG. 12 is a diagram illustrating an example of a print image output by the MFP 20.
  • FIG. 13 is a diagram illustrating an example of a print image as a comparative example with the print image illustrated in FIG. 12.
  • the MFP 20 exceeds the luminance gradation range that can be reproduced by the printer 24 (YES in S114), or the highest density that can be output by the printer 24 is less than a specific density (YES in S115). )
  • the print image information is generated by the processing of S116 without converting the luminance gradation in the input image into the lightness gradation in a single hue, the gradation in the input image is appropriately determined depending on the print image. Therefore, as shown in FIG. 13, it is impossible to reproduce the same gradation as the input image.
  • the MFP 20 exceeds the gradation range of brightness that can be reproduced by the printer 24 (YES in S114), or the maximum density that can be output by the printer 24 is less than a specific density (YES in S115). ),
  • the brightness gradation in the input image is converted into the brightness gradation in a single hue (S118), and print image information is generated (S120). Therefore, as shown in FIG. The gradation can be reproduced.
  • the MFP 20 converts the luminance gradation in the input image into the lightness gradation in a single hue (S118) and generates print image information (S120).
  • the print image is output (S121)
  • the MFP 20 can reduce the types of process colors to be used.
  • the MFP 20 can reduce the types of process colors to be used, the toner consumption can be suppressed. Therefore, the MFP 20 can reduce the cost.
  • the MFP 20 can reduce the types of process colors to be used, even if the toner of any process color has run out, it can be input by using the process color that has not run out of toner.
  • the brightness gradation in the image can be reproduced as the brightness gradation in a single hue in the printed image.
  • the MFP 20 sets the luminance gradation in the input image to the brightness in a single hue. Since it is reproduced as a gradation (S118), the gradation in the input image can be appropriately reproduced by the print image.
  • the MFP 20 may execute the process of S115 after the process of S113 without providing the process of S114. Further, the MFP 20 may be configured to execute the process of S116 in the case of NO in S114 without providing the process of S115. Further, the MFP 20 may execute the process of S117 after the process of S113 without providing either the process of S114 or the process of S115.
  • the MFP 20 performs the specification of the highest density that can be output by the printer 24 and the specification of the luminance gradation width that can be reproduced by the printer 24 in the calibration operation shown in FIG. 6 may be executed in an operation different from the calibration operation shown in FIG.
  • the configuration of the image forming system according to the present embodiment is the same as the configuration of the image forming system 10 (see FIG. 1) according to the first embodiment. Therefore, in the configuration of the image forming system according to the present embodiment, the same configuration as the configuration of the image forming system 10 is denoted by the same reference numeral as the configuration of the image forming system 10 and detailed description thereof is omitted.
  • the print instruction apparatus 30 starts the operation illustrated in FIG.
  • FIG. 14 is a flowchart of the operation of the print instruction apparatus 30 when instructing the MFP 20 to print based on the input image.
  • control unit 35 of the print instruction apparatus 30 determines whether or not an instruction to execute a print instruction based on the input image is instructed via the operation unit 31 (S131).
  • control unit 35 determines in S131 that execution of a print instruction based on the input image is not instructed, it determines whether or not selection of a region in the input image is instructed via the operation unit 31 (S132). .
  • the control unit 35 designates an arbitrary start point 51 a and end point 51 b with respect to the input image 50 displayed on the display unit 32, thereby causing the input image 50 to have a rectangular shape. The selection of the area 51 is instructed.
  • control unit 35 determines in S132 that selection of the region 51 in the input image is instructed via the operation unit 31, the control unit 35 generates region information including the coordinates of the start point 51a and the end point 51b in the input image of the instructed region 51. (S133).
  • the control unit 35 determines in S132 that selection of the region 51 in the input image is not instructed via the operation unit 31, or executes the processing in S131 when the processing in S133 is completed.
  • control unit 35 determines in S131 that execution of a print instruction based on the input image has been instructed, the control unit 35 determines whether or not the area information generated in S133 exists (S134).
  • control unit 35 When determining in S134 that the area information exists, the control unit 35 transmits the input image and the area information generated in S133 to the MFP 20 (S135), and ends the operation illustrated in FIG.
  • control unit 35 determines in S134 that there is no area information, the control unit 35 transmits the input image to the MFP 20 (S136), and ends the operation shown in FIG.
  • the MFP 20 executes the operation illustrated in FIG.
  • FIG. 16 is a flowchart of the operation of the MFP 20 when a print image is output based on the input image.
  • control unit 29 of the MFP 20 determines whether or not region information has been transmitted together with the input image (S141).
  • control unit 29 determines in S141 that the area information has not been transmitted together with the input image, the control unit 29 performs the same normal operation as the operation illustrated in FIG. 7 (S142), and ends the operation illustrated in FIG.
  • control unit 29 determines in S141 that the region information has been transmitted together with the input image, the control unit 29 executes the region selection operation shown in FIG. 17 (S143), and ends the operation shown in FIG.
  • the print image information generation unit 29a of the control unit 29 executes S151 to S159 similar to S111 to S119 (see FIG. 7).
  • the print image information generation unit 29a extends the gradation width in the image of the area 51 indicated by the area information transmitted together with the input image to a reproducible gradation width ( S160).
  • a gradation histogram in the image of the region 51 is shown in FIG. 18, and a gradation histogram after expansion of the gradation width is shown in FIG.
  • the gradation min is the minimum value of the gradation before expansion in the image of the region 51.
  • the gradation max is the maximum value of the gradation before expansion in the image in the region 51.
  • the gradation min ′ is the minimum reproducible gradation and is zero.
  • the gradation max ′ is the maximum reproducible gradation value, and is 2 N ⁇ 1 when the reproducible gradation is N bits.
  • An arbitrary gradation before expansion in the image of the region 51 is expanded as shown in the following expression using the gradation max and gradation min.
  • Gradation after expansion (2 N ⁇ 1) ⁇ (gradation before expansion ⁇ min) / (max ⁇ min)
  • the print image information generation unit 29a inverts the gradation in the image other than the area 51 after the process of S160 (S161).
  • the print image information generation unit 29a executes S162 and S163 similar to S120 and S121 (see FIG. 7), and ends the operation shown in FIG.
  • FIG. 20 is a diagram illustrating an example of a print image output by the MFP 20.
  • the MFP 20 expands the gradation width in the image of the area 51 to a reproducible gradation width (S160) and inverts the gradation in the image other than the area 51 (S161). Therefore, as shown in FIG. 20, regarding the image in the region 51, it is possible to reproduce the same gradation as that of the input image.
  • the MFP 20 when generating print image information based on an input image, the MFP 20 can reproduce the brightness gradation width in the image of the region 51 in a single hue in a single hue. Since it is expanded to the brightness gradation width (S160), even in the case where the gradation in the entire input image cannot be properly reproduced by the print image, in the image of the selected region 51 in the input image. The gradation can be appropriately reproduced by the printed image.
  • the MFP 20 expands the brightness gradation width in the image of the area 51 in a single hue to a brightness gradation width that can be reproduced in a single hue, the MFP 20 images other than the area 51 in the input image. Therefore, the gradation in the image of the selected region 51 in the input image can be made conspicuous in the print image.
  • both the print image information generation unit and the print execution unit are realized by the image forming apparatus in each of the above-described embodiments, but at least one of the print image information generation unit and the print execution unit.
  • the unit may be realized by a print instruction apparatus.
  • the print instruction apparatus may function as the print image information generation unit by executing an image processing program for realizing the print image information generation unit by the print instruction apparatus.
  • the print image information generation unit may cause the input image to have a luminance gradation width that exceeds a luminance gradation width that can be reproduced by the print execution unit.
  • Print image information may be generated by converting the luminance gradation into a lightness gradation in a single hue.
  • the image forming apparatus of the present invention can change the luminance gradation in the input image to a single in the printed image. Since it is reproduced as a lightness gradation in the hue, the gradation in the input image can be appropriately reproduced by the print image.
  • the print image information generation unit sets the luminance gradation in the input image in a single hue when the maximum density that can be output by the print execution unit is less than a specific density.
  • Print image information may be generated by converting to lightness gradation.
  • the image forming apparatus reduces the luminance gradation in the input image in the printed image when the performance of reproducing the luminance gradation in the input image as the luminance gradation in the printed image is degraded. Since reproduction is performed as lightness gradation in a single hue, gradation in an input image can be appropriately reproduced by a print image.
  • the print image information generation unit converts the luminance gradation in the image of the specific area selected from the input image into the lightness gradation in a single hue.
  • the brightness gradation width in an image of a specific region in a single hue may be expanded to the brightness gradation width in a single hue that can be reproduced by the print execution unit.
  • the image forming apparatus of the present invention when the image forming apparatus of the present invention generates print image information based on an input image, the brightness gradation width in an image of a specific region in a single hue is set in a single hue. Since it is expanded to the gradation range of lightness that can be reproduced, even if the gradation in the entire input image cannot be properly reproduced by the print image, the image of the specific area selected in the input image Can be appropriately reproduced by the printed image.
  • the print image information generation unit has a brightness gradation in a single hue that can be reproduced by the print execution unit in a brightness gradation width in an image of a specific region in a single hue.
  • the gradation in the image other than the specific area in the input image may be inverted.
  • the image forming apparatus of the present invention can expand the lightness gradation width in an image of a specific region in a single hue to a lightness gradation width that can be reproduced in a single hue. Since the gradation in the image other than the specific area in the input image is inverted, the gradation in the image in the specific area selected from the input image can be made conspicuous in the print image.
  • the image forming apparatus of the present invention is an MFP in each of the above-described embodiments, but may be an image forming apparatus other than the MFP, such as a dedicated printer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Theoretical Computer Science (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Facsimile Image Signal Circuits (AREA)
  • Color, Gradation (AREA)
  • Color Image Communication Systems (AREA)
  • Image Processing (AREA)

Abstract

La présente invention concerne un appareil de formation d'image et un système de formation d'image avec lesquels il est possible de réduire le nombre de types d'encres primaires utilisés. Un périphérique multifonction (MFP) (20) est doté : d'une section de génération d'informations d'image d'impression (29a) qui génère des informations d'image d'impression pour une image d'impression sur la base d'une image d'entrée ; et d'une section d'exécution d'impression (29b) qui produit l'image d'impression conformément aux informations d'image d'impression générées par la section de génération d'informations d'image d'impression (29a) (S121), la section de génération d'informations d'image d'impression (29a) convertissant des gradations de luminosité dans l'image d'entrée en gradations de clarté dans une teinte unique exprimée par deux types d'encres primaires (S118) ou plus, pour générer les informations d'image d'impression (S120).
PCT/JP2016/066709 2015-06-12 2016-06-06 Appareil de formation d'image et système de formation d'image WO2016199704A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2015119022A JP2018122432A (ja) 2015-06-12 2015-06-12 画像形成装置、画像処理プログラムおよび画像形成システム
JP2015-119022 2015-06-12

Publications (1)

Publication Number Publication Date
WO2016199704A1 true WO2016199704A1 (fr) 2016-12-15

Family

ID=57503189

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2016/066709 WO2016199704A1 (fr) 2015-06-12 2016-06-06 Appareil de formation d'image et système de formation d'image

Country Status (2)

Country Link
JP (1) JP2018122432A (fr)
WO (1) WO2016199704A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007129439A (ja) * 2005-11-02 2007-05-24 Canon Inc 色変換方法
JP2015070338A (ja) * 2013-09-26 2015-04-13 京セラドキュメントソリューションズ株式会社 画像処理装置及びプログラム
JP2015066014A (ja) * 2013-09-26 2015-04-13 京セラドキュメントソリューションズ株式会社 画像処理装置及びプログラム並びに画像形成装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007129439A (ja) * 2005-11-02 2007-05-24 Canon Inc 色変換方法
JP2015070338A (ja) * 2013-09-26 2015-04-13 京セラドキュメントソリューションズ株式会社 画像処理装置及びプログラム
JP2015066014A (ja) * 2013-09-26 2015-04-13 京セラドキュメントソリューションズ株式会社 画像処理装置及びプログラム並びに画像形成装置

Also Published As

Publication number Publication date
JP2018122432A (ja) 2018-08-09

Similar Documents

Publication Publication Date Title
US9189715B2 (en) Image forming apparatus that prints out multi-gradation monochrome image maintaining gradation reproducibility, and image forming method
US11750765B2 (en) Performing color conversion that acquires a sample color included in second image data
JP7367159B2 (ja) 画像処理装置、画像処理方法、および、プログラム
US8768195B2 (en) Image processing apparatus and image processing method
JP5815619B2 (ja) 画像形成装置及び画像形成方法
US9218553B2 (en) Image forming apparatus reproducing gradation based on hue instead of luminance, and image forming method
US9989875B2 (en) Image processing apparatus, image processing method, and storage medium
US8368962B2 (en) Color look up table adjusting apparatus, recording medium on which a color look up table adjusting program is recorded and color look up table adjusting system
WO2016199704A1 (fr) Appareil de formation d'image et système de formation d'image
US10375277B2 (en) Image processing apparatus, method, and storage medium using color-adjusted image data
US10523846B2 (en) Performing color correction of image data where selection information is indicating that color correction is not to be performed
JP6521250B2 (ja) 画像形成装置、色変換プログラムおよび色変換方法
JP2020057913A (ja) 画像処理装置及び画像処理方法
US11405524B2 (en) Image forming apparatus, method of control, and program product for printing an image on a sheet based on a setting and counting a number of sheets on which scanned images determined to be chromatic or achromatic are printed
JP2008271361A (ja) 画像処理装置及び画像処理方法
JP2014099829A (ja) 画像処理装置および画像処理方法ならびに画像処理を実行するプログラム
JP2006094039A (ja) 画像処理装置、画像処理方法及びプログラム
JP2004146914A (ja) インク消費量削減方法，インク消費量削減装置およびインク消費量削減プログラム
JP2003250045A (ja) プリンタ更正装置及びその制御方法
JP4793409B2 (ja) 画像評価装置及びプログラム
JP2020168779A (ja) 画像形成装置及びその制御方法、並びにプログラム
JP6212090B2 (ja) 画像形成装置及び画像形成方法
JP2019102938A (ja) 情報処理装置、情報処理方法ならびにプログラム
JP2012129875A (ja) 画像形成装置
JP2010130501A (ja) 画像処理装置、画像形成装置、画像処理方法、プログラムおよびその記録媒体

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 16807411

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 16807411

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP