JP2012045796A5 - - Google Patents
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上記目的を達成するために、請求項１の発明は、対象画像データに擬似中間調処理を施す擬似中間調処理手段と、少なくとも可視波長域の光を一様に吸収する可視波長域光吸収色材と該可視波長域光吸収色材以外の色材とを含む複数の色材を用いて記録媒体上に画像形成を行う作像手段と、を有する画像形成装置であって、前記対象画像データに前記擬似中間調処理を施した後、前記可視波長域光吸収色材以外の色材に対応する画像データにおける前記可視波長域光吸収色材と前記可視波長域光吸収色材以外の色材とが前記記録媒体上で重なる画素の信号値である低減前信号値を、前記可視波長域光吸収色材以外の色材のうち少なくとも１つの任意の色材では前記低減前信号値より小さい信号値である低減後信号値に変換し、かつ前記任意の色材以外の色材では前記低減前信号値より小さく又は同等以下の前記低減後信号値に変換する色材量低減処理手段を有し、該色材量低減処理手段による色材量低減処理後の各色の画像データに基づいて前記作像手段によって画像形成を行うことを特徴とする画像形成装置である。
また、請求項２の発明は、請求項１記載の画像形成装置であって、前記低減後信号値は、前記低減前信号値で形成した画像データと前記低減後信号値で形成した画像データとに基づいて前記作像手段で記録媒体上に形成したときの色彩値の変化量が規定値以下であり、かつ各色の前記低減前信号値と前記低減後信号値との各変化量の合計値が最大となる信号値であることを特徴とするものである。
更に、請求項３の発明は、請求項２記載の画像形成装置であって、前記色彩値の変化量は、均等色空間における前記低減前信号値で形成した画像の色彩値と前記低減後信号値で形成した画像の色彩値との間の距離で表されることを特徴とするものである。
また、請求項４の発明は、請求項１〜３のいずれか１項に記載の画像形成装置であって、前記色材量低減処理手段における前記低減前信号値と前記低減後信号値の対応関係をパラメータとして記憶した記憶手段を有し、前記色材量低減処理手段は前記記憶手段を参照して前記低減前信号値を前記低減後信号値に変換することを特徴とするものである。
更に、請求項５の発明は、請求項４記載の画像形成装置であって、画像形成を行う記録媒体の種類に関する情報を取得する記録媒体情報取得手段を有し、前記記憶手段には取得可能な記録媒体の種類別に作成し記憶され、前記色材量低減処理手段は前記記録媒体情報取得手段で取得した記録媒体の種類に対応する前記記憶手段を選択し、選択した前記記憶手段を参照して前記低減前信号値を前記低減後信号値に変換することを特徴とするものである。
また、請求項６の発明は、請求項１〜５のいずれか１項に記載の画像形成装置であって、対象画像データの信号値を前記可視波長域光吸収色材に対応する信号を含む墨生成後信号値に変換する墨生成処理手段を有し、該墨生成処理手段は、対象画像データに基づき前記可視波長域光吸収色材と重なる前記可視波長域光吸収色材以外の色材の色材量を算出し、前記可視波長域光吸収色材と重なる前記可視波長域光吸収色材以外の色材の色材量に基づき前記墨生成後信号値を算出することを特徴とするものである。
更に、請求項７の発明は、請求項６記載の画像形成装置であって、前記墨生成後信号値は、前記可視波長域光吸収色材と重なる前記可視波長域光吸収色材の色材量が最大となる信号値であることを特徴とするものである。
また、請求項８の発明は、請求項６記載の画像形成装置であって、前記墨生成後信号値は、前記低減前信号値と前記低減後信号値の変化量に基づき算出した信号値であることを特徴とするものである。
更に、請求項９の発明は、請求項８記載の画像形成装置であって、前記墨生成後信号値は、前記低減前信号値と前記低減後信号値の変化量が最大となる信号値であることを特徴とするものである。
また、請求項１０の発明は、請求項１〜９のいずれか１項に記載の画像形成装置であって、各色の色ずれ量を補正する色ずれ補正手段を備えていることを特徴とするものである。
更に、請求項１１の発明は、請求項１０記載の画像形成装置であって、前記色ずれ補正手段は所定のタイミングで色ずれ補正処理を実行することを特徴とするものである。
In order to achieve the above object, the invention of claim 1 includes a pseudo halftone processing unit that performs pseudo halftone processing on target image data, and a visible wavelength region light absorption color that uniformly absorbs at least light in the visible wavelength region. an image forming apparatus comprising: a imaging means, a for forming an image on a recording medium by using a plurality of color materials including a wood and the visible wavelength region light-absorbing colorant other than the color material, before Symbol object image After performing the pseudo halftone processing on the data, the color other than the visible wavelength light absorbing color material and the visible wavelength light absorbing color material in the image data corresponding to the color material other than the visible wavelength light absorbing color material The signal value before reduction, which is a signal value of a pixel that overlaps with the recording medium on the recording medium , is smaller than the signal value before reduction in any one of the color materials other than the visible light absorption color material. Converted to a reduced signal value that is a signal value, and The color material other than the color material has a color material amount reduction processing unit that converts the signal value after the reduction to a signal value that is smaller than or equal to or less than the signal value before reduction, and after the color material amount reduction processing by the color material amount reduction processing unit. An image forming apparatus that forms an image with the image forming unit based on image data of each color.
The invention according to claim 2 is the image forming apparatus according to claim 1, wherein the reduced signal value includes image data formed with the pre-reduction signal value and image data formed with the post-reduction signal value. The amount of change in the color value when formed on the recording medium by the image forming means is less than or equal to a specified value, and the total value of the amounts of change between the pre-reduction signal value and the post-reduction signal value of each color Is the maximum signal value.
Further, the invention of claim 3 is the image forming apparatus according to claim 2, wherein the change amount of the color value is the color value of the image formed by the signal value before reduction in the uniform color space and the signal after reduction. It is expressed by the distance between the color value of the image formed by the value.
According to a fourth aspect of the present invention, there is provided the image forming apparatus according to any one of the first to third aspects, wherein the pre-reduction signal value and the post-reduction signal value in the color material amount reduction processing unit are associated with each other. The color material amount reduction processing unit converts the pre-reduction signal value into the post-reduction signal value with reference to the storage unit.
The invention according to claim 5 is the image forming apparatus according to claim 4, further comprising recording medium information acquisition means for acquiring information relating to the type of recording medium on which image formation is performed, and the storage means can acquire the information. The color material amount reduction processing means selects the storage means corresponding to the type of the recording medium acquired by the recording medium information acquisition means, and refers to the selected storage means. The signal value before reduction is converted into the signal value after reduction.
The invention according to claim 6 is the image forming apparatus according to any one of claims 1 to 5, wherein a signal value of the target image data includes a signal corresponding to the visible light absorption color material. Black generation processing means for converting into a signal value after generation of black, and the black generation processing means is a color material other than the visible light absorption color material that overlaps with the visible light absorption color material based on target image data And calculating the signal value after the black generation based on the color material amount of the color material other than the visible wavelength region light absorbing color material overlapping the visible wavelength region light absorbing color material. Is.
Further, the invention according to claim 7 is the image forming apparatus according to claim 6, wherein the signal value after the black generation is a color material of the visible wavelength range light absorbing color material overlapping the visible wavelength range light absorbing color material. The signal value has the maximum amount.
The invention according to claim 8 is the image forming apparatus according to claim 6, wherein the signal value after black generation is a signal value calculated based on a change amount between the signal value before reduction and the signal value after reduction. It is characterized by being.
Further, the invention of claim 9 is the image forming apparatus according to claim 8, wherein the signal value after black generation is a signal value that maximizes the amount of change between the signal value before reduction and the signal value after reduction. It is characterized by being.
According to a tenth aspect of the present invention, in the image forming apparatus according to any one of the first to ninth aspects, the image forming apparatus includes a color misregistration correction unit that corrects a color misregistration amount of each color. Is.
Furthermore, an invention according to an eleventh aspect is the image forming apparatus according to the tenth aspect, wherein the color misregistration correction unit executes a color misregistration correction process at a predetermined timing.
本発明において、擬似中間調処理後の対象画像データに基づいて記録媒体上に画像を形成するために、少なくとも可視波長域の光を一様に吸収する可視波長域光吸収色材と可視波長域光吸収色材以外の色材とを含む複数の色材が用いられる。そして、可視波長域光吸収色材と可視波長域光吸収色材以外の色材の組み合わせや色材量を変えて記録媒体上で互いに重ね合わせることにより、様々な色を持つ画像を再現している。このように、可視波長域光吸収色材と可視波長域光吸収色材以外の色材とが記録媒体上で重ね合わせて色を再現しているとき、可視波長域光吸収色材以外の色材を透過した光は、可視波長域光吸収色材に吸収される。このため、可視波長域光吸収色材以外の色材における色再現への寄与は小さい。そして、対象画像データにおいて、擬似中間調処理後の可視波長域光吸収色材以外の色材の画素の信号値である低減前信号値を小さくして可視波長域光吸収色材以外の色材の量を減らしたとしても色の再現への影響は少ない。そこで、色材量低減処理手段によって、可視波長域光吸収色材以外の色材に対応する画像データにおける可視波長域光吸収色材と可視波長域光吸収色材以外の色材とが記録媒体上で重なる画素の信号値である低減前信号値を、可視波長域光吸収色材以外の色材のうち少なくとも１つの任意の色材では低減前信号値より小さい信号値である低減後信号値に変換する。また、可視波長域光吸収色材以外の色材のうち少なくとも１つの任意の色材以外の色材では、信号前信号値を、低減前信号値より小さいか、あるいは同等以下の信号値である低減後信号値に変換する。そして、これらの低減後信号値の画像データに基づいて作像手段によって画像形成を行う。これにより、色再現範囲は変わらずに、複数の色材が重なって色再現を行っている画像データにおいて色材消費量を低減することができる。 In the present invention, in order to form an image on a recording medium based on target image data after pseudo halftone processing, at least a visible wavelength range light-absorbing color material and a visible wavelength range that uniformly absorb light in the visible wavelength range A plurality of color materials including a color material other than the light absorbing color material is used. Then, by changing the combination of the visible wavelength range light-absorbing color material and the color material other than the visible wavelength range light-absorbing color material and the color material amount and superimposing them on the recording medium, images with various colors can be reproduced. Yes. In this way, when the visible wavelength region light-absorbing color material and the color material other than the visible wavelength region light-absorbing color material are superimposed on the recording medium to reproduce the color, the color other than the visible wavelength region light-absorbing color material The light transmitted through the material is absorbed by the visible wavelength region light absorbing color material. For this reason, the contribution to color reproduction in a color material other than the visible wavelength region light-absorbing color material is small. Then, pairs in elephant image data, halftone processed signal value of a pixel of a color material other than the visible wavelength region light-absorbing colorant is to reduce the reduction before the signal value other than the visible wavelength region light-absorbing colorant color Even if the amount of material is reduced, the effect on color reproduction is small. Therefore, the color material amount reduction processing means causes the visible wavelength band light absorbing color material and the color material other than the visible wavelength band light absorbing color material in the image data corresponding to the color material other than the visible wavelength band light absorbing color material to be recorded on the recording medium. The signal value before reduction, which is the signal value of the overlapping pixel, is the signal value after reduction, which is a signal value smaller than the signal value before reduction in at least one arbitrary color material other than the light wavelength-absorbing color material. Convert to In addition, in the color material other than at least one arbitrary color material other than the visible wavelength region light-absorbing color material, the signal value before the signal is smaller than or equal to the signal value before the reduction. Convert to reduced signal value. Then, image formation is performed by the image forming means based on the image data of these reduced signal values. As a result, the color material consumption can be reduced in the image data in which a plurality of color materials overlap and perform color reproduction without changing the color reproduction range.
以上説明したように、実施形態によれば、擬似中間調処理後の画像データに対してＫ色材と記録媒体上で重なるＣＭＹの各色材の信号値を低減させる色材量低減処理は、ＣＭＹのうち少なくとも１つの任意の色材の低減前信号値に対する低減後信号値が低減前信号値より小さい、かつ任意の色材以外の低減前信号値に対する低減後信号値が低減前信号値より小さく又は同等以下であるように、低減前信号を低減後信号に変換する処理である。このような色材量低減処理を施すことで、色再現範囲を狭めることなく色材消費量を効果的に低減することが可能となる。 As described above, according to the embodiment, the color material amount reduction processing for reducing the signal value of each color material of CMY that overlaps the K color material on the recording medium with respect to the image data after pseudo halftone processing is performed by CMY. The signal value after reduction with respect to the signal value before reduction of at least one arbitrary color material is smaller than the signal value before reduction, and the signal value after reduction with respect to the signal value before reduction other than any color material is smaller than the signal value before reduction. Or it is the process which converts the signal before reduction into the signal after reduction so that it may be below equivalent. By performing such a color material amount reduction process, it is possible to effectively reduce the color material consumption amount without narrowing the color reproduction range.
Claims (11)
前記対象画像データに前記擬似中間調処理を施した後、前記可視波長域光吸収色材以外の色材に対応する画像データにおける前記可視波長域光吸収色材と前記可視波長域光吸収色材以外の色材とが前記記録媒体上で重なる画素の信号値である低減前信号値を、前記可視波長域光吸収色材以外の色材のうち少なくとも１つの任意の色材では前記低減前信号値より小さい信号値である低減後信号値に変換し、かつ前記任意の色材以外の色材では前記低減前信号値より小さく又は同等以下の前記低減後信号値に変換する色材量低減処理手段を有し、
該色材量低減処理手段による色材量低減処理後の各色の画像データに基づいて前記作像手段によって画像形成を行うことを特徴とする画像形成装置。 A pseudo halftone processing unit that performs pseudo halftone processing on target image data; a visible wavelength range light absorbing color material that uniformly absorbs light in at least a visible wavelength range; and a color material other than a visible wavelength range light absorbing color material. An image forming device that forms an image on a recording medium using a plurality of color materials including:
After subjected to the pseudo halftone processing before Symbol target image data, wherein the image data the visible wavelength region light-absorbing colorant visible wavelength region light-absorbing color corresponding to the color material other than the visible wavelength region light-absorbing colorant A pre-reduction signal value that is a signal value of a pixel that overlaps with a color material other than the color material on the recording medium, and at least one arbitrary color material other than the visible wavelength region light absorption color material before the reduction. Color material amount reduction that converts to a signal value after reduction that is a signal value smaller than the signal value, and that converts to a signal value after reduction that is smaller than or equal to or less than or equal to the signal value before reduction for the color material other than the arbitrary color material Having processing means,
An image forming apparatus, wherein the image forming unit forms an image based on image data of each color after the color material amount reduction processing by the color material amount reduction processing unit.
前記低減後信号値は、前記低減前信号値で形成した画像データと前記低減後信号値で形成した画像データとに基づいて前記作像手段で記録媒体上に形成したときの色彩値の変化量が規定値以下であり、かつ各色の前記低減前信号値と前記低減後信号値との各変化量の合計値が最大となる信号値であることを特徴とする画像形成装置。 The image forming apparatus according to claim 1,
The post-reduction signal value is the amount of change in color value when formed on the recording medium by the image forming means based on the image data formed with the pre-reduction signal value and the image data formed with the post-reduction signal value. The image forming apparatus is characterized in that the signal value is equal to or less than a specified value, and a total value of each change amount of the pre-reduction signal value and the post-reduction signal value of each color is a maximum.
前記色彩値の変化量は、均等色空間における前記低減前信号値で形成した画像の色彩値と前記低減後信号値で形成した画像の色彩値との間の距離で表されることを特徴とする画像形成装置。 The image forming apparatus according to claim 2,
The change amount of the color value is represented by a distance between a color value of an image formed with the signal value before reduction in a uniform color space and a color value of an image formed with the signal value after reduction. Image forming apparatus.
前記色材量低減処理手段における前記低減前信号値と前記低減後信号値の対応関係をパラメータとして記憶した記憶手段を有し、前記色材量低減処理手段は前記記憶手段を参照して前記低減前信号値を前記低減後信号値に変換することを特徴とする画像形成装置。 The image forming apparatus according to any one of claims 1 to 3,
Storage means for storing a correspondence relationship between the pre-reduction signal value and the post-reduction signal value in the color material amount reduction processing means as a parameter; An image forming apparatus that converts a previous signal value into the reduced signal value.
画像形成を行う記録媒体の種類に関する情報を取得する記録媒体情報取得手段を有し、前記記憶手段には取得可能な記録媒体の種類別に作成し記憶され、前記色材量低減処理手段は前記記録媒体情報取得手段で取得した記録媒体の種類に対応する前記記憶手段を選択し、選択した前記記憶手段を参照して前記低減前信号値を前記低減後信号値に変換することを特徴とする画像形成装置。 The image forming apparatus according to claim 4,
Recording medium information acquisition means for acquiring information relating to the type of recording medium on which image formation is performed; the storage means is created and stored for each type of recordable recording medium; and the color material amount reduction processing means is the recording medium An image characterized in that the storage means corresponding to the type of recording medium acquired by the medium information acquisition means is selected, and the pre-reduction signal value is converted into the post-reduction signal value with reference to the selected storage means. Forming equipment.
前記対象画像データの信号値を前記可視波長域光吸収色材に対応する信号を含む墨生成後信号値に変換する墨生成処理手段を有し、該墨生成処理手段は前記対象画像データに基づき前記可視波長域光吸収色材と重なる前記可視波長域光吸収色材以外の色材の色材量を算出し、前記可視波長域光吸収色材と重なる前記可視波長域光吸収色材以外の色材の色材量に基づき前記墨生成後信号値を算出することを特徴とする画像形成装置。 An image forming apparatus according to any one of claims 1 to 5,
A black generation processing means for converting the signal value of the target image data into a black generated signal value including a signal corresponding to the visible light absorption color material, and the black generation processing means is based on the target image data; Calculate the color material amount of the color material other than the visible wavelength range light absorption color material overlapping the visible wavelength range light absorption color material, and other than the visible wavelength range light absorption color material overlapping the visible wavelength range light absorption color material An image forming apparatus, wherein the post-black signal value is calculated based on a color material amount of a color material.
前記墨生成後信号値は、前記可視波長域光吸収色材と重なる前記可視波長域光吸収色材の色材量が最大となる信号値であることを特徴とする画像形成装置。 The image forming apparatus according to claim 6, wherein
2. The image forming apparatus according to claim 1, wherein the black-generated signal value is a signal value that maximizes a color material amount of the visible wavelength light absorbing color material overlapping the visible wavelength light absorbing color material.
前記墨生成後信号値は、前記低減前信号値と前記低減後信号値の変化量に基づき算出した信号値であることを特徴とする画像形成装置。 The image forming apparatus according to claim 6, wherein
2. The image forming apparatus according to claim 1, wherein the black signal value is a signal value calculated based on a change amount of the pre-reduction signal value and the post-reduction signal value.
前記墨生成後信号値は、前記低減前信号値と前記低減後信号値の変化量が最大となる信号値であることを特徴とする画像形成装置。 The image forming apparatus according to claim 8, wherein
2. The image forming apparatus according to claim 1, wherein the black signal value is a signal value that maximizes a change amount between the pre-reduction signal value and the post-reduction signal value.
各色の色ずれ量を補正する色ずれ補正手段を備えていることを特徴とする画像形成装置。 An image forming apparatus according to any one of claims 1 to 9,
An image forming apparatus comprising color misregistration correction means for correcting a color misregistration amount of each color.
前記色ずれ補正手段は所定のタイミングで色ずれ補正処理を実行することを特徴とする画像形成装置。 The image forming apparatus according to claim 10, wherein
The image forming apparatus according to claim 1, wherein the color misregistration correction unit executes a color misregistration correction process at a predetermined timing.
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| JP2010189066A JP5594586B2 (en) | 2010-08-26 | 2010-08-26 | Image forming apparatus |
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| JP2012045796A JP2012045796A (en) | 2012-03-08 |
| JP2012045796A5 true JP2012045796A5 (en) | 2013-10-10 |
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| JP6135073B2 (en) | 2012-09-01 | 2017-05-31 | 株式会社リコー | Image forming apparatus |
| JP6339817B2 (en) | 2014-02-13 | 2018-06-06 | キヤノン株式会社 | Image forming apparatus, image processing apparatus, and image processing method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3730057B2 (en) * | 1999-07-26 | 2005-12-21 | シャープ株式会社 | Image processing apparatus, image forming apparatus using the same, and recording medium on which program is recorded |
| JP2002125129A (en) * | 2000-10-13 | 2002-04-26 | Fuji Xerox Co Ltd | Color image forming device |
| JP2003220727A (en) * | 2002-01-30 | 2003-08-05 | Canon Inc | Image processing apparatus, image processing method, computer readable storage medium, and program |
| JP2007098771A (en) * | 2005-10-04 | 2007-04-19 | Sharp Corp | Image forming apparatus, control program and computer readable recording medium |
| JP4618152B2 (en) * | 2006-02-10 | 2011-01-26 | 富士ゼロックス株式会社 | Color conversion apparatus, image forming system, and color conversion method |
| JP2007235661A (en) * | 2006-03-02 | 2007-09-13 | Fuji Xerox Co Ltd | Image processor, program, and color conversion condition setting method |
| JP2008099089A (en) * | 2006-10-13 | 2008-04-24 | Konica Minolta Business Technologies Inc | Color image processing method, color image processor and color image processing program |
| JP2008203670A (en) * | 2007-02-21 | 2008-09-04 | Kyocera Mita Corp | Image forming apparatus |
| JP5146424B2 (en) * | 2008-09-13 | 2013-02-20 | 株式会社リコー | Image processing apparatus, image processing method, program, recording medium, printing system, and image forming apparatus |
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