JP2002344763A5 - - Google Patents
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第１の色座標系における表色系であって、第１の色数を表色可能な第１の表色系の画像データを、第２の色座標系における表色系であって、前記第１の色数よりも多い第２の色数を表色可能な第２の表色系の画像データへ、マトリクス演算により変換する色変換手段と、
前記第２の表色系において前記変換された画像データに対して画像処理を実行する画像処理手段と、
前記画像処理が施された画像データの表色数を低減させる表色数低減手段とを備える画像処理装置。An image processing apparatus that executes image processing on image data,
A color system in the first color coordinate system, wherein the first color system image data that can represent the first number of colors is a color system in the second color coordinate system, the second number of colors larger than the first number of colors to the image data of the second colorimetric system capable color, and the color conversion means for converting by Ma Torikusu operation,
Image processing means for performing image processing on the converted image data in the second color system;
An image processing apparatus comprising: a color number reduction means for reducing the number of color specifications of the image data subjected to the image processing.
前記画像処理手段により実行される画像処理には、ガンマ補正処理が含まれる画像処理装置。The image processing apparatus according to claim 1.
An image processing apparatus that includes gamma correction processing in the image processing executed by the image processing means.
前記第１の表色系はＹＣＣ表色系であり、
前記第２の表色系はｓＲＧＢ表色系である画像処理装置。The image processing apparatus according to claim 2,
The first color system is a YCC color system;
The image processing apparatus wherein the second color system is an sRGB color system.
前記第２の表色系の第２の色数には、前記色変換手段によって前記第１の表色系から前記第２の表色系に変換された画像データに含まれている負値によって表現される色数が含まれる画像処理装置。The image processing apparatus according to claim 1.
The second color number of the second color system is determined by a negative value included in the image data converted from the first color system to the second color system by the color conversion unit. An image processing apparatus including the number of colors to be expressed.
前記画像処理手段により実行される画像処理には、ガンマ補正処理が含まれる画像処理装置。The image processing apparatus according to claim 4.
An image processing apparatus that includes gamma correction processing in the image processing executed by the image processing means.
前記画像処理手段により実行される画像処理には、第２のマトリクス演算を用いた色変換処理が含まれる画像処理装置。The image processing apparatus according to claim 4 or 5,
An image processing apparatus including a color conversion process using a second matrix operation in the image processing executed by the image processing means.
前記第１の表色系はＹＣＣ表色系であり、
前記第２の表色系はｓＲＧＢ表色系よりも広い表色域を有するｗＲＧＢ表色系である画像処理装置。The image processing apparatus according to claim 4.
The first color system is a YCC color system;
The image processing apparatus, wherein the second color system is a wRGB color system having a wider color gamut than the sRGB color system.
第１の有効数字を有する整数値で表される前記画像データの色彩値を、前記第１の有効数字の桁数よりも多い桁数を有する第１の値に変更する第１の画像処理手段と、
前記第１の画像処理手段による色彩値の変更に伴う前記画像データの階調数の減少を防止する階調数減少防止手段と、
前記第１の値を有する画像データの色彩値を前記第１の値から、画像出力結果に反映される第２の値に変更する第２の画像処理手段とを備える画像処理装置。An image processing apparatus that executes image processing on image data,
First image processing means for changing a color value of the image data represented by an integer value having a first significant digit to a first value having a number of digits larger than the number of digits of the first significant digit When,
Gradation number reduction preventing means for preventing a decrease in the number of gradations of the image data due to a change in color value by the first image processing means;
An image processing apparatus comprising: a second image processing unit configured to change a color value of image data having the first value from the first value to a second value reflected in an image output result.
前記階調数減少防止手段は、前記第１の有効数字の桁数よりも多い桁数まで前記第１の値の有効数字を設定することにより、前記画像データの階調数の減少を防止することを特徴とする画像処理装置。The image processing apparatus according to claim 8.
The gradation number reduction preventing means prevents the decrease in the number of gradations of the image data by setting the effective number of the first value to a number of digits greater than the number of digits of the first significant number. An image processing apparatus.
前記階調数減少防止手段によって階調数の減少が防止された画像データのデータサイズは、前記第１の有効数字を有する整数値で表される画像データのデータサイズよりも大きいことを特徴とする画像処理装置。The image processing apparatus according to claim 9.
The data size of the image data in which the reduction in the number of gradations is prevented by the gradation number reduction preventing means is larger than the data size of the image data represented by an integer value having the first significant digit. An image processing apparatus.
前記第１の画像処理手段は、前記画像データの色空間を第１の色空間から第２の色空間に変換する色空間変換手段であることを特徴とする画像処理装置。The image processing apparatus according to any one of claims 8 to 10,
The image processing apparatus according to claim 1, wherein the first image processing means is color space conversion means for converting a color space of the image data from a first color space to a second color space.
前記色空間変換手段は、前記画像データの色空間をＹＣｂＣｒ色空間からＲＧＢ色空間へ変換し、前記第１の有効数字を有する整数値で表される前記画像データの色彩値を、小数点を含む前記第１の値に変更することを特徴とする画像処理装置。The image processing apparatus according to claim 11.
The color space conversion unit converts a color space of the image data from a YCbCr color space to an RGB color space, and the color value of the image data represented by an integer value having the first significant number includes a decimal point. An image processing apparatus, wherein the image processing apparatus changes to the first value.
前記画像データの階調数を第１の階調数から第２の階調数に増加させると共に、画像データの色空間をＹＣｂＣｒ色空間からＲＧＢ色空間に変換する第１の色空間変換手段と、
前記色空間が変換された画像データに対してガンマ補正処理を実行するガンマ補正手段と、
前記ガンマ補正処理が実行された画像データの色空間を前記ＲＧＢ色空間からｓＲＧＢ色空間よりも広い定義領域を有するｗＲＧＢ色空間に変換する第２の色空間変換手段と、
前記色空間が変換された画像データの階調数を前記第２の階調数から前記第１の階調数に戻す階調数低減手段とを備える画像処理装置。An image processing apparatus that executes image processing on image data,
First color space conversion means for increasing the number of gradations of the image data from the first number of gradations to the second number of gradations and converting the color space of the image data from the YCbCr color space to the RGB color space; ,
Gamma correction means for performing gamma correction processing on the image data in which the color space is converted;
Second color space conversion means for converting the color space of the image data subjected to the gamma correction processing from the RGB color space to a wRGB color space having a definition area wider than the sRGB color space;
An image processing apparatus comprising: a gradation number reduction unit that returns the gradation number of the image data in which the color space is converted from the second gradation number to the first gradation number.
前記色空間が変換された画像データに対して逆ガンマ補正処理を実行する逆ガンマ補正手段を備え、
前記階調数低減手段は、前記色空間が変換された画像データに代えて、前記逆ガンマ補正が実行がされた画像データの階調数を前記第２の階調数から第１の階調数に戻すことを特徴とする画像処理装置。The image processing apparatus according to claim 13 further includes:
A reverse gamma correction unit that performs a reverse gamma correction process on the image data in which the color space is converted;
The gradation number reduction means changes the gradation number of the image data on which the inverse gamma correction has been executed from the second gradation number to the first gradation instead of the image data in which the color space is converted. An image processing apparatus characterized by returning to a number.
前記逆ガンマ補正が実行された画像データの画質を補正する画像補正手段を備え、
前記階調数低減手段は、前記逆ガンマ補正が実行がされた画像データに代えて、前記画質が補正された画像データの階調数を前記第２の階調数から第１の階調数に戻すことを特徴とする画像処理装置。The image processing apparatus according to claim 14 further includes:
Image correction means for correcting the image quality of the image data subjected to the inverse gamma correction;
The gradation number reduction means changes the gradation number of the image data whose image quality has been corrected from the second gradation number to the first gradation number instead of the image data on which the inverse gamma correction has been executed. An image processing apparatus, wherein
請求項１、請求項８および請求項１３のいずれかに記載の画像処理装置と、
前記画像処理装置によって画像処理の施された画像データを出力する出力手段とを備える出力装置。An output device for outputting image data subjected to image processing,
An image processing device according to any one of claims 1, 8, and 13,
An output device comprising: output means for outputting image data subjected to image processing by the image processing device.
第１の色座標系における表色系であって、第１の色数を表色可能な第１の表色系の画像データを、第２の色座標系における表色系であって、前記第１の色数よりも多い第２の色数を表色可能な第２の表色系の画像データへ、マトリクス演算により変換する機能と、
前記第２の表色系において前記変換された画像データに対して画像処理を実行する機能と、
前記画像処理が施された画像データの表色数を低減させる機能とをコンピュータによって実現させる画像処理プログラム。An image processing program for executing image processing on image data,
A color system in the first color coordinate system, wherein the first color system image data that can represent the first number of colors is a color system in the second color coordinate system, the second number of colors larger than the first number of colors to the image data of the second colorimetric system capable color, a function of converting the Ma Torikusu operation,
A function of executing image processing on the converted image data in the second color system;
The image processing program which implement | achieves the function to reduce the number of color specification of the image data to which the said image processing was performed by computer.
前記第２の表色系の第２の色数には、前記色変換手段によって前記第１の表色系から前記第２の表色系に変換された画像データに含まれている負値によって表現される色数が含まれる画像処理プログラム。The image processing program according to claim 17,
The second color number of the second color system is determined by a negative value included in the image data converted from the first color system to the second color system by the color conversion unit. An image processing program that contains the number of colors to be represented.
前記画像処理を実行する機能は、ガンマ補正処理および第２のマトリクス演算を用いた色変換処理の少なくとも一方を実行する機能である画像処理プログラム。The image processing program according to claim 18,
The image processing program is a function for executing at least one of gamma correction processing and color conversion processing using a second matrix operation.
前記第１の表色系はＹＣＣ表色系であり、
前記第２の表色系はｓＲＧＢ表色系よりも広い表色域を有するｗＲＧＢ表色系である画像処理プログラム。The image program according to claim 18,
The first color system is a YCC color system;
The image processing program, wherein the second color system is a wRGB color system having a wider color gamut than the sRGB color system.
第１の有効数字を有する整数値で表される前記画像データの色彩値を、前記第１の有効数字の桁数よりも多い桁数を有する第１の値に変更する第１の画像処理機能と、
前記第１の画像処理手段による色彩値の変更に伴う前記画像データの階調数の減少を防止する機能と、
前記第１の値を有する画像データの色彩値を前記第１の値から、画像出力結果に反映される第２の値に変更する第２の画像処理機能とをコンピュータによって実現させる画像処理プログラム。An image processing program for executing image processing on image data,
A first image processing function for changing a color value of the image data represented by an integer value having a first significant digit to a first value having a number of digits larger than the number of digits of the first significant digit When,
A function of preventing a decrease in the number of gradations of the image data associated with a change in color value by the first image processing unit;
An image processing program for causing a computer to realize a second image processing function for changing a color value of image data having the first value from the first value to a second value reflected in an image output result.
前記階調数減少の防止は、前記第１の有効数字の桁数よりも多い桁数まで前記第１の値の有効数字を設定することにより実現されることを特徴とする画像処理プログラム。The image processing program according to claim 21, wherein
The image processing program according to claim 1, wherein the reduction in the number of gradations is realized by setting significant digits of the first value to a number greater than the number of digits of the first significant digit.
前記階調数の減少が防止された画像データのデータサイズは、前記第１の有効数字を有する整数値で表される画像データのデータサイズよりも大きいことを特徴とする画像処理プログラム。The image processing program according to claim 22,
An image processing program, wherein a data size of image data in which a reduction in the number of gradations is prevented is larger than a data size of image data represented by an integer value having the first significant number.
前記第１の画像処理機能は、前記画像データの色空間を第１の色空間から第２の色空間に変換する色空間変換機能をコンピュータによって実現させることを特徴とする画像処理プログラム。The image processing program according to claim 22 or claim 23,
The first image processing function causes a computer to realize a color space conversion function for converting a color space of the image data from a first color space to a second color space.
前記色空間変換機能は、前記画像データの色空間をＹＣｂＣｒ色空間からＲＧＢ色空間へ変換し、前記第１の有効数字を有する整数値で表される前記画像データの色彩値を、小数点を含む前記第１の値に変更することを特徴とする画像処理プログラム。The image processing program according to claim 24,
The color space conversion function converts a color space of the image data from a YCbCr color space to an RGB color space, and the color value of the image data represented by an integer value having the first significant number includes a decimal point. An image processing program that changes to the first value.
前記画像データの階調数を第１の階調数から第２の階調数に増加させると共に、画像データの色空間をＹＣｂＣｒ色空間からｓＲＧＢ色空間に変換する第１の色空間変換機能と、
前記色空間が変換された画像データに対してガンマ補正処理を実行するガンマ補正機能と、
前記ガンマ補正処理が実行された画像データの色空間をｓＲＧＢ色空間からｓＲＧＢ色空間よりも広い定義領域を有するｗＲＧＢ色空間に変換する第２の色空間変換機能と、
前記色空間が変換された画像データの階調数を前記第２の階調数から前記第１の階調数に戻す階調数低減機能とをコンピュータによって実現させる画像処理プログラム。An image processing program for executing image processing on image data,
A first color space conversion function for increasing the number of gradations of the image data from the first number of gradations to the second number of gradations and converting the color space of the image data from the YCbCr color space to the sRGB color space; ,
A gamma correction function for performing gamma correction processing on the image data in which the color space is converted;
A second color space conversion function for converting the color space of the image data subjected to the gamma correction processing from the sRGB color space to a wRGB color space having a definition area wider than the sRGB color space;
An image processing program for realizing, by a computer, a gradation number reduction function for returning the gradation number of the image data in which the color space has been converted from the second gradation number to the first gradation number.
前記色空間が変換された画像データに対して逆ガンマ補正処理を実行する逆ガンマ補正機能をコンピュータによって実現させ、
前記階調数低減機能は、前記色空間が変換された画像データに代えて、前記逆ガンマ補正が実行がされた画像データの階調数を前記第２の階調数から第１の階調数に戻す機能であることを特徴とする画像処理プログラム。The image processing program according to claim 26 further includes:
A computer realizes a reverse gamma correction function for performing a reverse gamma correction process on the image data in which the color space is converted,
The gradation number reduction function changes the gradation number of the image data on which the inverse gamma correction has been executed from the second gradation number to the first gradation instead of the image data in which the color space is converted. An image processing program having a function of returning to a number.
前記逆ガンマ補正が実行された画像データの画質を自動的に補正する画像補正機能をコンピュータによって実現させ、
前記階調数低減機能は、前記逆ガンマ補正が実行がされた画像データに代えて、前記画質が補正された画像データの階調数を前記第２の階調数から第１の階調数に戻す機能であることを特徴とする画像処理プログラム。The image processing program according to claim 27 further includes:
An image correction function for automatically correcting the image quality of the image data subjected to the inverse gamma correction is realized by a computer,
The gradation number reduction function is configured to change the gradation number of the image data whose image quality has been corrected from the second gradation number to the first gradation number instead of the image data on which the inverse gamma correction has been executed. An image processing program characterized by having the function of returning to
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| US6822758B1 (en) * | 1998-07-01 | 2004-11-23 | Canon Kabushiki Kaisha | Image processing method, system and computer program to improve an image sensed by an image sensing apparatus and processed according to a conversion process |
| US7209145B2 (en) * | 2004-04-02 | 2007-04-24 | Xerox Corporation | Color device profile having a buffered look-up table |
| JP2007005903A (en) * | 2005-06-21 | 2007-01-11 | Ichikawa Soft Laboratory:Kk | Image processing apparatus and image processing method |
| JP4560730B2 (en) * | 2005-08-22 | 2010-10-13 | 富士ゼロックス株式会社 | Image processing apparatus, image forming apparatus, image processing method, and program |
| JP4208877B2 (en) | 2005-12-28 | 2009-01-14 | キヤノン株式会社 | Image processing apparatus and method, computer program, and storage medium |
| CN114244969B (en) * | 2021-12-21 | 2024-03-15 | 上海集成电路装备材料产业创新中心有限公司 | Image brightness correction method and hardware system |
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