WO2016158317A1 - 画像処理装置および画像形成装置 - Google Patents
画像処理装置および画像形成装置 Download PDFInfo
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- WO2016158317A1 WO2016158317A1 PCT/JP2016/057750 JP2016057750W WO2016158317A1 WO 2016158317 A1 WO2016158317 A1 WO 2016158317A1 JP 2016057750 W JP2016057750 W JP 2016057750W WO 2016158317 A1 WO2016158317 A1 WO 2016158317A1
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- color conversion
- image
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- 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
- H04N1/6002—Corrections within particular colour systems
- H04N1/6008—Corrections within particular colour systems with primary colour signals, e.g. RGB or CMY(K)
-
- 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
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/32561—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device using a programmed control device, e.g. a microprocessor
-
- 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
- H04N1/40—Picture signal circuits
- H04N1/409—Edge or detail enhancement; Noise or error suppression
-
- 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
- H04N1/58—Edge or detail enhancement; Noise or error suppression, e.g. colour misregistration correction
-
- 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
-
- 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
- H04N1/387—Composing, repositioning or otherwise geometrically modifying originals
- H04N1/393—Enlarging or reducing
- H04N1/3935—Enlarging or reducing with modification of image resolution, i.e. determining the values of picture elements at new relative positions
Definitions
- An image processing apparatus detects an edge of a black character in a document image and performs enhancement processing on the edge (see, for example, Patent Document 1).
- Another image processing apparatus detects a black edge in a document image, and sets the CMY (cyan, magenta, yellow) value of the lowest density pixel among the peripheral pixels of the pixel on the black edge on the black edge. And the black value of the pixel on the black edge is increased (see, for example, Patent Document 2).
- CMY cyan, magenta, yellow
- colors that are the same in a plurality of pixels in the image before the filter processing are mutually connected after the filter processing.
- the colors may be different, and the colors may be different from each other after color conversion.
- the emphasis processing may be weaker than black characters due to the saturation gain of the filter processing. In this case, although the hue change is reduced, the emphasis is weakened, and the character sharpness is not improved.
- the present invention has been made in view of the above problem, and after filtering and color conversion, the color of a character in a character edge region having the same color as that of a pixel outside the character edge region is filtered before the filtering process.
- An object of the present invention is to obtain an image processing apparatus and an image forming apparatus that are not greatly different from colors of pixels outside the region.
- An image processing apparatus includes an area separation unit that identifies a character in the input image based on image data of the input image, and a filter process that performs a filter process on the character edge region of the character And color conversion processing for pixels in the character edge region have color conversion characteristics different from color conversion processing for pixels other than the pixels in the character edge region, and compensate for color errors caused by the filtering processing And a color conversion unit that executes the color conversion characteristics.
- An image forming apparatus includes the image processing apparatus and a printing apparatus that prints an image based on image data after color conversion by the color conversion unit.
- the color of the pixel in the character edge region having the same color as the pixel outside the character edge region before the filtering process is changed between the color of the pixel outside the character region after the filtering process and the color conversion. It will not be a big difference.
- FIG. 1 is a block diagram showing a configuration of an image forming apparatus according to an embodiment of the present invention.
- FIG. 2 is a diagram for explaining the change in the saturation of black characters according to the filter strength and the reading resolution.
- FIG. 3 is a diagram for explaining changes in saturation and hue of color characters in accordance with filter strength and reading resolution.
- FIG. 4 is a flowchart for explaining the operation of the color conversion unit 24 in FIG.
- FIG. 1 is a block diagram showing a configuration of an image forming apparatus according to an embodiment of the present invention.
- An image forming apparatus 1 shown in FIG. 1 is a copying machine. However, the image forming apparatus 1 may be a multifunction machine.
- the image forming apparatus 1 includes a printing device 11, an image reading device 12, an image processing device 13, and a storage device 14.
- the printing apparatus 11 is an example of an output device, and an original image is electrophotographic using CMYK (cyan, magenta, yellow, black) toner based on image data after color conversion by the image processing apparatus 13.
- CMYK cyan, magenta, yellow, black
- the image reading device 12 is an internal device that optically reads a document image from a document and generates image data of the document image as RGB data.
- the image processing device 13 performs image processing such as color conversion on the image data generated by the image reading device 12 or the like.
- the image processing apparatus 13 is realized by an ASIC (Application Specific Integrated Circuit) or a microcomputer, and includes a control unit 21, a region separation unit 22, a filter processing unit 23, and a color conversion unit 24. Further, the storage device 14 stores color conversion data 31.
- the color conversion data 31 includes a color conversion table (lookup table) corresponding to a plurality of color conversion characteristics. In this embodiment, the color conversion data 31 includes a color conversion table (lookup table) corresponding to a plurality of filter intensities and a plurality of reading resolutions.
- the color conversion table (lookup table) converts RGB data into CMY data and compensates for color changes caused by filter processing.
- FIG. 2 is a diagram for explaining the change in the saturation of black characters according to the filter strength and the reading resolution. As shown in FIG. 2, the saturation characteristics of black characters after filtering change from the characteristics before filtering, and the saturation characteristics of black characters after filtering change according to the filter strength and reading resolution. To do.
- FIG. 3 is a diagram for explaining changes in saturation and hue of color characters in accordance with filter strength and reading resolution.
- FIG. 3 shows the characteristics of saturation and hue before and after filtering of color characters for predetermined six colors (six hues) in the a * b * plane.
- the saturation and hue characteristics of the color characters after the filtering process change from the characteristics before the filtering process according to the filter strength and the reading resolution.
- the color conversion data 31 includes a plurality of color conversion characteristics look-up tables.
- the lookup table of each color conversion characteristic is black for the input of the low saturation region corresponding to the filter strength and the reading resolution (that is, the region below the saturation corresponding to the filter strength and the reading resolution).
- (Saturation zero) is output, and the input hue with respect to an input of a specific saturation and hue region (for example, a region indicated by a dotted circle in FIG. 3) set according to the filter strength and the reading resolution.
- the value is changed to an appropriate hue value (for example, for the same color outside the character edge region in the input image, the hue value of the color obtained by the same filtering and color conversion in the default lookup table)
- This specific saturation and hue region is set at a location where a deviation from an appropriate value in hue has occurred depending on the filter strength and reading resolution.
- the reading resolution is two steps of 600 dpi and 300 dpi and the filter strength is two steps of strong and weak
- one or both of the reading resolution and the filter strength may be three or more stages, and a look-up table corresponding to each condition may be included in the color conversion data 31.
- the color conversion data 31 may include a look-up table corresponding to two stages of a high resolution of 600 dpi or more and a low resolution of 300 dpi or less.
- the control unit 21 controls the printing device 11 and the image reading device 12 to acquire the image data of the original image by specifying the reading resolution, and causes the image processing device 13 to print the original image after the image processing.
- the region separation unit 22 identifies characters in the input image based on the image data of the input image.
- the input image is a document image read by the image reading device 12.
- the region separation unit 22 specifies color characters in addition to black characters.
- the region separation unit 22 identifies the character edge region of the identified character.
- the character edge region is a region having a width of a predetermined number of pixels of 1 or more from the edge of the specified character.
- the filter processing unit 23 performs a filter process on the character edge region of the specified character. For example, the filter processing unit 23 calculates the product sum of the matrix filter coefficient of N ⁇ M pixels and the pixel value of the pixel at the position corresponding to the filter coefficient as the filter process.
- the color conversion unit 24 performs color conversion processing on the pixels in the character edge region with color conversion characteristics corresponding to the intensity of the filter processing described above.
- the filter processing intensity here, the enhancement intensity
- the color conversion unit 24 obtains information on the filter processing intensity in the filter processing unit 23 from the filter processing unit 23. Then, a look-up table in the color conversion data 31 is selected corresponding to the intensity of the filtering process.
- the color conversion unit 24 performs color conversion processing on the pixels in the character edge region with color conversion characteristics corresponding to the resolution when the input image is read by the image reading device 12. Specifically, the reading resolution of the image reading device 12 is variable, and the color conversion unit 24 acquires information on the reading resolution of the input image from the control unit 21, and the color conversion data 31 corresponding to the reading resolution. Select the lookup table at.
- control unit 21 controls the image reading device 12 to acquire a document image read from a document as an input image.
- the input image is an image of RGB color data.
- the region separation unit 22 analyzes the input image and detects an object such as a character in the input image. Further, at this time, the region separation unit 22 specifies the character edge region of the character in the input image. Then, the filter processing unit 23 performs enhancement filter processing on the character edge region.
- FIG. 4 is a flowchart for explaining the operation of the color conversion unit 24 in FIG.
- the color conversion unit 24 specifies the filter strength for this input image (step S1), and specifies the reading resolution for this input image (step S2).
- the color conversion unit 24 selects a lookup table corresponding to the specified filter processing intensity and reading resolution (step S3).
- the color conversion unit 24 selects the pixels of the input image after the filter processing as the target pixel in order along the scanning direction (step S4).
- the color conversion unit 24 determines whether or not the target pixel is a pixel in the character edge region (step S5).
- step S6 If the pixel of interest is a pixel in the character edge region, color conversion of the pixel of interest is executed using the lookup table selected in step S3 (step S6). If not, color conversion of the pixel of interest is performed using the default lookup table without using the lookup table selected in step S3 (step S7).
- the color conversion unit 24 determines whether or not the color conversion of all the pixels in the input image after the filter processing is completed (step S8), and when the color conversion of all the pixels is not completed. Returning to step S4, the pixel next to the current pixel of interest is selected as the pixel of interest (step S4), and the same processing is performed on the pixel of interest. If it is determined in step S8 that the color conversion of all the pixels in the input image after the filter processing has been completed, the color conversion unit 24 completes the color conversion processing for the input image.
- CMYK data is generated from the CMY data of the input image generated by the color conversion by black generation / UCR (Under Color Removal) processing, and an image based on the CMYK data is printed on the printing apparatus. 11 is printed.
- the filter processing unit 23 performs the filter process on the character edge region of the character in the input image, and the color conversion unit 24 performs the processing on the pixels in the character edge region.
- the color conversion process is executed with a color conversion characteristic that is different from the color conversion process for the pixels other than the pixels in the character edge region and compensates for a color error caused by the filter process.
- the color of the pixel in the character edge region having the same color as the pixel outside the character edge region before the filter processing does not greatly differ from the color of the pixel outside the character region after the filter processing and color conversion. It becomes like this.
- the present invention is applicable to an image forming apparatus such as a multifunction peripheral.
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- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Image Processing (AREA)
- Facsimile Image Signal Circuits (AREA)
- Color Image Communication Systems (AREA)
Abstract
Description
Claims (4)
- 入力画像の画像データに基づき、前記入力画像内の文字を特定する領域分離部と、
前記文字の文字エッジ領域に対してフィルター処理を実行するフィルター処理部と、
前記文字エッジ領域内の画素に対する色変換処理を、前記文字エッジ領域内の画素以外の画素に対する色変換処理とは異なる色変換特性であり、かつ前記フィルター処理に起因する色誤差を補償する色変換特性で実行する色変換部と、
を備えることを特徴とする画像処理装置。 - 前記色変換部は、前記フィルター処理の強度に応じた色変換特性で、前記文字エッジ領域内の画素に対する色変換処理を実行することを特徴とする請求項1記載の画像処理装置。
- 前記入力画像は、画像読取装置によって読み取られた画像であって、
前記色変換部は、前記画像読取装置によって読み取られた際の解像度に応じた色変換特性で、前記文字エッジ領域内の画素に対する色変換処理を実行すること、
を特徴とする請求項1記載の画像処理装置。 - 画像処理装置と、
印刷装置と、
を備え、
前記画像処理装置は、入力画像の画像データに基づき、前記入力画像内の文字を特定する領域分離部と、前記文字の文字エッジ領域に対してフィルター処理を実行するフィルター処理部と、前記文字エッジ領域内の画素に対する色変換処理を、前記文字エッジ領域内の画素以外の画素に対する色変換処理とは異なる色変換特性であり、かつ前記フィルター処理に起因する色誤差を補償する色変換特性で実行する色変換部とを備え、
前記印刷装置は、前記色変換部による色変換後の画像データに基づく画像を印刷すること、
を特徴とする画像形成装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16772201.6A EP3280126B1 (en) | 2015-03-31 | 2016-03-11 | Image processing apparatus and image forming apparatus |
CN201680015928.4A CN107431740B (zh) | 2015-03-31 | 2016-03-11 | 图像处理装置和图像形成装置 |
US15/560,456 US10194055B2 (en) | 2015-03-31 | 2016-03-11 | Image processing apparatus and image forming apparatus |
JP2017509493A JP6468470B2 (ja) | 2015-03-31 | 2016-03-11 | 画像処理装置および画像形成装置 |
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JP2015072174 | 2015-03-31 | ||
JP2015-072174 | 2015-03-31 |
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WO2016158317A1 true WO2016158317A1 (ja) | 2016-10-06 |
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PCT/JP2016/057750 WO2016158317A1 (ja) | 2015-03-31 | 2016-03-11 | 画像処理装置および画像形成装置 |
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US (1) | US10194055B2 (ja) |
EP (1) | EP3280126B1 (ja) |
JP (1) | JP6468470B2 (ja) |
CN (1) | CN107431740B (ja) |
WO (1) | WO2016158317A1 (ja) |
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JP7059799B2 (ja) * | 2018-05-23 | 2022-04-26 | 富士フイルムビジネスイノベーション株式会社 | 情報処理装置及びプログラム |
US11791538B1 (en) | 2022-03-25 | 2023-10-17 | Infineon Technologies Ag | Antenna in package arrangement |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007067908A (ja) * | 2005-08-31 | 2007-03-15 | Kyocera Mita Corp | 画像処理装置、画像形成装置、画像処理方法及び画像処理プログラム |
JP2007166561A (ja) * | 2005-12-17 | 2007-06-28 | Fuji Xerox Co Ltd | 画像処理装置および画像処理方法、画像処理プログラム、記憶媒体 |
JP2008017014A (ja) * | 2006-07-04 | 2008-01-24 | Ricoh Co Ltd | 画像処理装置と画像処理方法とプログラム |
JP2010124472A (ja) * | 2009-12-21 | 2010-06-03 | Sharp Corp | 画像処理装置、画像形成装置、画像処理方法、コンピュータプログラム及び記録媒体 |
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---|---|---|---|---|
JP3399486B2 (ja) * | 1993-06-30 | 2003-04-21 | 富士ゼロックス株式会社 | カラー画像処理装置及び方法 |
JP3477858B2 (ja) | 1994-11-18 | 2003-12-10 | ミノルタ株式会社 | 画像処理装置及び画像データ処理方法 |
JP3289530B2 (ja) | 1994-12-29 | 2002-06-10 | ミノルタ株式会社 | 画像処理装置 |
JP3768028B2 (ja) | 1999-04-30 | 2006-04-19 | シャープ株式会社 | 画像処理方法、画像処理装置及び画像形成装置 |
US7376268B2 (en) * | 2002-09-17 | 2008-05-20 | Ricoh Company, Limited | Image processing apparatus for transmitting image data to an external device |
JP3964297B2 (ja) * | 2002-09-19 | 2007-08-22 | 株式会社リコー | 画像処理装置、画像処理方法、およびコンピュータが実行するためのプログラム |
JPWO2005013622A1 (ja) * | 2003-06-30 | 2006-09-28 | 株式会社ニコン | 色成分の混在配列された画像を処理する画像処理装置、画像処理プログラム、電子カメラ、および画像処理方法 |
JP4623300B2 (ja) * | 2005-12-17 | 2011-02-02 | 富士ゼロックス株式会社 | 画像処理装置および画像処理プログラム |
JP2007235384A (ja) * | 2006-02-28 | 2007-09-13 | Ricoh Co Ltd | 画像処理装置、画像処理方法、画像処理プログラム及び記録媒体 |
US20070292041A1 (en) * | 2006-06-16 | 2007-12-20 | Kabushiki Kaisha Toshiba | Image processing apparatus, image forming apparatus, and image processing method |
US7633538B2 (en) * | 2006-09-11 | 2009-12-15 | Aptina Imaging Corporation | Color filter device and method for eliminating or reducing non-uniform color error caused by asymmetric color cross-talk in image sensor devices |
JP4749476B2 (ja) * | 2009-04-09 | 2011-08-17 | シャープ株式会社 | 画像処理装置、画像形成装置、画像処理方法、コンピュータプログラム及び記録媒体 |
JP6031286B2 (ja) * | 2012-07-23 | 2016-11-24 | キヤノン株式会社 | 画像処理装置及び画像処理方法 |
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2016
- 2016-03-11 CN CN201680015928.4A patent/CN107431740B/zh not_active Expired - Fee Related
- 2016-03-11 US US15/560,456 patent/US10194055B2/en not_active Expired - Fee Related
- 2016-03-11 EP EP16772201.6A patent/EP3280126B1/en active Active
- 2016-03-11 WO PCT/JP2016/057750 patent/WO2016158317A1/ja active Application Filing
- 2016-03-11 JP JP2017509493A patent/JP6468470B2/ja not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007067908A (ja) * | 2005-08-31 | 2007-03-15 | Kyocera Mita Corp | 画像処理装置、画像形成装置、画像処理方法及び画像処理プログラム |
JP2007166561A (ja) * | 2005-12-17 | 2007-06-28 | Fuji Xerox Co Ltd | 画像処理装置および画像処理方法、画像処理プログラム、記憶媒体 |
JP2008017014A (ja) * | 2006-07-04 | 2008-01-24 | Ricoh Co Ltd | 画像処理装置と画像処理方法とプログラム |
JP2010124472A (ja) * | 2009-12-21 | 2010-06-03 | Sharp Corp | 画像処理装置、画像形成装置、画像処理方法、コンピュータプログラム及び記録媒体 |
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US10194055B2 (en) | 2019-01-29 |
CN107431740B (zh) | 2019-04-26 |
US20180077320A1 (en) | 2018-03-15 |
JP6468470B2 (ja) | 2019-02-13 |
EP3280126A4 (en) | 2018-03-14 |
CN107431740A (zh) | 2017-12-01 |
JPWO2016158317A1 (ja) | 2018-01-11 |
EP3280126B1 (en) | 2020-04-22 |
EP3280126A1 (en) | 2018-02-07 |
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