WO2012017946A1 - 画像処理方法、画像処理装置及び画像処理プログラム - Google Patents
画像処理方法、画像処理装置及び画像処理プログラム Download PDFInfo
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
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- G06T11/001—Texturing; Colouring; Generation of texture or colour
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- the present invention relates to an image processing method, an image processing apparatus, and an image processing program.
- Patent Document 1 There is an image processing method in which gradation conversion is performed based on an average luminance value of a local area in an image in order to improve the brightness and contrast of a backlight or shade area existing in the image.
- Patent Document 2 There is an image processing method in which gradation conversion is performed based on an average luminance value of a local area in an image in order to improve the brightness and contrast of a backlight or shade area existing in the image.
- Patent Document 1 by determining a correction amount of a target pixel based on a weighted average luminance value (hereinafter referred to as a peripheral luminance value) of a local region around the target pixel, a highlight region included in the image, The gradation of the shadow area is corrected.
- a weighted average luminance value hereinafter referred to as a peripheral luminance value
- Patent Document 2 a backlight intensity of an image is calculated from an input image, a tone mapping curve for correcting the pixel is generated from the calculated backlight intensity and a peripheral luminance value of the target pixel, and correction is performed. .
- the peripheral luminance value of the target pixel is calculated by interpolation processing from the average luminance value in each rectangular area, and the optimum correction amount is determined.
- a new tone mapping curve for correcting a target pixel is generated by interpolation from a tone mapping curve generated by an average luminance value in each rectangular area, and correction processing is executed.
- Patent Document 1 describes an example in which global tone correction for adjusting the tone of the entire image is performed again after tone correction in a local region.
- FIG. 6 is a block diagram created based on the descriptions in Patent Document 1 and Patent Document 2.
- the image processing apparatus shown in FIG. 6 includes a rectangular area average luminance calculation unit 11, a local correction tone mapping curve generation unit 12, a local gradation correction unit 13, and a global correction tone mapping curve generation unit 14.
- the global tone correction means 15, the local correction parameter storage means 16, and the global correction parameter storage means 17.
- the rectangular area luminance calculation means 11 calculates an average luminance value in each rectangular area.
- the local correction tone mapping curve generation means 12 performs tone correction in the local region for each peripheral luminance value according to the analysis result of the input image and the parameters read from the local correction parameter storage means 16. A tone mapping curve for local correction is generated.
- the local gradation correction unit 13 calculates the peripheral luminance value of the target pixel by interpolation processing from the rectangular area average luminance, corrects the target pixel according to the local correction tone mapping curve corresponding to the calculated peripheral luminance value, Generate an image.
- the global correction tone mapping curve generation unit 14 generates a global correction tone mapping curve that adjusts the gradation of the entire image according to the analysis result of the intermediate image and the parameters read from the global correction parameter storage unit 17. .
- the global tone correction means 15 corrects the intermediate image according to the global correction tone mapping curve to generate an output image.
- an object of the present invention is to provide an image processing method and an image processing apparatus that can execute high-quality gradation correction with a small amount of memory and a small amount of calculation.
- An object of the present invention is to provide an image processing program.
- a tone mapping curve for local gradation correction is generated for each target pixel in the input image according to the luminance of the surrounding area, and at least the overall luminance or contrast of the image after the local gradation correction is generated.
- One is predicted from the average luminance of the partial area obtained by dividing the input image, and based on the prediction, a tone mapping curve for global tone correction is generated, and the tone mapping curve for the local tone correction and the tone mapping curve.
- the local tone correction and the global tone correction are executed simultaneously by integrating a tone mapping curve for global tone correction.
- the present invention provides a local tone correction tone mapping curve generating means for generating a tone mapping curve for local tone correction in accordance with the luminance of the peripheral region of each pixel of interest in the input image, and after the local tone correction.
- Prediction means for predicting at least one of the overall brightness or contrast of the image from the average brightness of the partial area obtained by dividing the input image, and generating a tone mapping curve for global tone correction based on the prediction
- a tone mapping curve generating unit for global tone correction, and the tone mapping curve for local tone correction and the tone mapping curve for global tone correction are integrated, and the local tone correction and the global tone correction curve are integrated.
- An image processing apparatus having correction means for simultaneously executing gradation correction.
- the present invention provides a process for generating a tone mapping curve for local gradation correction for each pixel of interest in an input image according to the luminance of its peripheral area, and the overall luminance or contrast of the image after the local gradation correction.
- a process for predicting at least one of the average brightness of a partial area obtained by dividing the input image, a process for generating a tone mapping curve for global gradation correction based on the prediction, and the local gradation correction An image processing program that integrates the tone mapping curve and the tone mapping curve for global gradation correction, and causes the information processing apparatus to execute processing for simultaneously executing the local gradation correction and the global gradation correction It is.
- high-quality gradation correction can be executed with a small amount of calculation and a low amount of memory.
- FIG. 1 is a block diagram showing a configuration of an embodiment according to the present invention.
- FIG. 2 is a flowchart showing the operation of the embodiment according to the present invention.
- FIG. 3 is a diagram showing an example of a global correction tone mapping curve.
- FIG. 4 is a diagram showing an example of a global correction tone mapping curve.
- FIG. 5 is a block diagram of the information processing system according to the embodiment of the present invention.
- FIG. 6 is a diagram for explaining the related art of the present invention.
- FIG. 1 is a block diagram showing a configuration of an embodiment according to the present invention.
- the image processing apparatus according to the present invention shown in FIG. 1 includes a rectangular area average luminance calculation means 21, a local correction tone mapping curve generation means 22, a rectangular area average luminance correction means 23, and a global correction tone mapping curve generation.
- the embodiment according to the present invention analyzes the corrected rectangular area average luminance in which the rectangular area average luminance is corrected in advance by the local correction tone mapping curve, and generates a global correction tone mapping curve, thereby generating a local correction tone mapping curve. This is greatly different from the related art described above in that gradation correction and global gradation correction are performed simultaneously. Hereinafter, the operation of each means will be described in detail.
- the rectangular area average luminance calculating means 21 calculates the average luminance value in each rectangular area as in the related art.
- a component representing the brightness of the pixel of interest (lightness: V component in the HSV color space, L component in the Lab color space, luminance: YUV color space) by color conversion. Y component, etc.) is calculated, and this value is used as a luminance value to calculate an average luminance value.
- an average luminance value is calculated using a value of a component representing the brightness of a color called a luminance component or a brightness component as a luminance value.
- the local correction tone mapping curve generation unit 22 determines the level in the local region for each peripheral luminance value according to the analysis result of the input image and the parameters read from the local correction parameter storage unit 26. Generate a local correction tone mapping curve for performing tone correction.
- the output of the local correction tone mapping curve generation means 12 may be a parameter representing the shape of the tone mapping curve instead of the tone mapping curve.
- the local correction tone mapping curve is a gamma correction curve
- a gamma value for each peripheral luminance value can be output instead of outputting a gamma correction curve for each peripheral luminance value.
- the rectangular area average luminance correction means 23 corrects the rectangular area average luminance by the local correction tone mapping curve, and calculates a corrected rectangular area average luminance representing the predicted value of the average luminance after the local gradation correction in each rectangular area. calculate.
- the corrected rectangular area average luminance value So (i) in the i-th rectangular area is a local correction tone mapping curve using the input rectangular area average luminance value S (i) as a peripheral luminance value. It is calculated by selecting and reading the output value for S (i) for the selected tone mapping curve.
- the tone mapping curve for local correction is a gamma correction curve
- the corrected rectangular area average luminance value So (i) is expressed by the following equation using the gamma value ⁇ (S (i)) for S (i). It is calculated as 1.
- M represents the maximum value that the rectangular area average luminance value can take.
- a method of calculating the corrected rectangular area average luminance value a method of holding in advance the value of the corrected rectangular area average luminance with respect to the rectangular area average luminance as data, and reading the corresponding calculated value from this data at the time of calculation. It may be used.
- the global correction tone mapping curve generation unit 24 adjusts the gradation of the entire image according to the analysis value of the corrected rectangular area average luminance and the parameters read from the global correction parameter storage unit 26. Is generated.
- an estimated value of the average luminance of the entire image after local gradation correction is calculated as an analysis value of the corrected rectangular area average luminance, and this value is used for global correction.
- the gamma value ⁇ (E, P) for converting the predicted image luminance E into the target average luminance value P can be calculated by the following equation (3).
- a linear tone mapping curve as shown in FIG. 3 may be used.
- the maximum value and the minimum value of the correction rectangular area average luminance are used as the analysis value of the correction rectangular area average luminance, and a tone mapping curve as shown in FIG. There is a way to generate.
- Max and Min represent the maximum value and the minimum value of the corrected rectangular area average luminance
- Th represents the parameter value held in the global correction parameter storage unit 26.
- the output of the global correction tone mapping curve generation unit 24 may be a parameter representing the shape of the tone correction curve instead of the tone mapping curve, similarly to the output of the local correction tone mapping curve generation unit 22.
- the tone correction unit 25 performs tone correction using a local correction tone mapping curve and tone correction using a global correction tone mapping curve on each pixel of the input image to generate an output image. To do.
- gradation correction for a certain target pixel is executed as follows. First, the peripheral luminance value of the target pixel position is calculated from the rectangular region average luminance by interpolation processing. Next, a corresponding local correction tone mapping curve is selected from the calculated peripheral luminance values, and local gradation correction is executed. Finally, correction is performed using a global correction tone mapping curve to generate an output pixel.
- gradation correction processing is executed for each color channel.
- gradation correction processing is executed only for a component representing the brightness of a color called a luminance component or a brightness component.
- a new tone mapping curve is generated by combining the local correction tone mapping curve and the global correction tone mapping curve before executing the correction process.
- the tone correction processing may be executed using the generated composite tone mapping curve. In this case, since the tone correction processing for each pixel is executed by referring to the tone mapping curve once, the overall processing speed is faster than the correction by referring to each tone mapping curve.
- the rectangular area luminance calculating means 11 calculates an average luminance value in each rectangular area (S01).
- the local correction tone mapping curve generating means 12 generates a local correction tone mapping curve for performing gradation correction in the local region (S02).
- the rectangular area average luminance correction means 23 calculates a corrected rectangular area average luminance representing a predicted value of average luminance after local gradation correction in each rectangular area (S03).
- the global correction tone mapping curve generating means 24 generates a global correction tone mapping curve for adjusting the gradation of the entire image (S04).
- the gradation correction means 25 performs gradation correction on each pixel of the input image to generate an output image (S05).
- the required memory amount can be reduced, and the backlight and shaded area gradation in the image can be corrected with high quality with a low calculation amount.
- the reason is that local tone correction and global tone correction are performed simultaneously by estimating the average luminance of the rectangular area of the image after local tone correction in advance and generating a tone mapping curve for global correction. Because.
- the information processing system shown in FIG. 5 includes a processor 31, a program memory 32, and a storage medium 33.
- the storage medium 33 functions as the local correction parameter storage unit 16 and the global correction parameter storage unit 27.
- a magnetic storage medium such as a hard disk, a nonvolatile memory, or the like can be used.
- the program memory 302 includes the above-described rectangular area average luminance calculating means 21, local correction tone mapping curve generating means 22, rectangular area average luminance correcting means 23, global correction tone mapping curve generating means 24, A program for performing processing similar to that of the tone correction unit 25 is stored, and the processor 301 reads out the program and performs similar processing.
- a tone mapping curve for local tone correction is generated for each pixel of interest in the input image according to the luminance of the surrounding area, Predicting at least one of the overall luminance or contrast of the image after the local gradation correction from the average luminance of the partial area obtained by dividing the input image; Based on the prediction, a tone mapping curve for global tone correction is generated, An image processing method in which the local tone correction tone mapping curve and the global tone correction tone mapping curve are integrated, and the local tone correction and the global tone correction are executed simultaneously.
- the predicted value of the overall luminance of the image after the local gradation correction is calculated by taking the average value of the average luminance values of the partial areas after the local gradation correction. The image processing method as described.
- a local tone correction tone mapping curve generating means for generating a tone mapping curve for local tone correction according to the luminance of the peripheral region of each pixel of interest in the input image; Predicting means for predicting at least one of the overall luminance or contrast of the image after the local gradation correction from the average luminance of the partial area obtained by dividing the input image;
- a global tone correction tone mapping curve generating means for generating a tone mapping curve for global tone correction based on the prediction;
- the said prediction means corrects the average brightness
- the image processing apparatus according to appendix 7 or appendix 8, which calculates a predicted value of the average luminance of each partial area.
- the said prediction means takes the average value of the average luminance value of each partial area
- the image processing apparatus according to appendix 9, which calculates.
- the said prediction means calculates the overall contrast of the image after the said local gradation correction from the maximum value and the minimum value of the predicted value of the average luminance value of each partial area after the said local gradation correction.
- the image processing apparatus according to appendix 9, which calculates.
- a tone mapping curve of at least one of the local gradation correction and the global gradation correction is a gamma correction curve.
- the present invention can be applied to an image processing apparatus that automatically corrects backlight and shaded gradation in an image.
- Rectangle area average luminance calculation means 22
- Local correction tone mapping curve generation means 23
- Rectangle area average luminance correction means 24
- Global correction tone mapping curve generation means 25
- Gradation correction means 26
- Local correction parameter storage means 27
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Abstract
Description
前記局所的階調補正後の画像の全体的な輝度又はコントラストの少なくとも一つを、前記入力画像を分割した部分領域の平均輝度から予測し、
前記予測に基づいて、大局的階調補正のトーンマッピングカーブを生成し、
前記局所的階調補正のトーンマッピングカーブと前記大局的階調補正のトーンマッピングカーブとを統合し、前記局所的階調補正と前記大局的階調補正とを同時に実行する
画像処理方法。
付記1又は付記2に記載の画像処理方法。
付記3に記載の画像処理方法。
付記3に記載の画像処理方法。
付記1から付記5のいずれかに記載の画像処理方法。
前記局所的階調補正後の画像の全体的な輝度又はコントラストの少なくとも一つを、前記入力画像を分割した部分領域の平均輝度から予測する予測手段と、
前記予測に基づいて、大局的階調補正のトーンマッピングカーブを生成する大局的階調補正用トーンマッピングカーブ生成手段と、
前記局所的階調補正のトーンマッピングカーブと前記大局的階調補正のトーンマッピングカーブとを統合し、前記局所的階調補正と前記大局的階調補正とを同時に実行する補正手段と
を有する画像処理装置。
付記7又は付記8に記載の画像処理装置。
付記9に記載の画像処理装置。
付記9に記載の画像処理装置。
付記7から付記11のいずれかに記載の画像処理装置。
前記局所的階調補正後の画像の全体的な輝度又はコントラストの少なくとも一つを、前記入力画像を分割した部分領域の平均輝度から予測する処理と、
前記予測に基づいて、大局的階調補正のトーンマッピングカーブを生成する処理と、
前記局所的階調補正のトーンマッピングカーブと前記大局的階調補正のトーンマッピングカーブとを統合し、前記局所的階調補正と前記大局的階調補正とを同時に実行する処理と
を情報処理装置に実行させる画像処理プログラム。
22 局所的補正用トーンマッピングカーブ生成手段
23 矩形領域平均輝度補正手段
24 大局的補正用トーンマッピングカーブ生成手段
25 階調補正手段
26 局所的補正パラメータ記憶手段
27 大局的補正パラメータ記憶手段
Claims (10)
- 入力画像中の各注目画素をその周辺領域の輝度によって、局所的階調補正のトーンマッピングカーブを生成し、
前記局所的階調補正後の画像の全体的な輝度又はコントラストの少なくとも一つを、前記入力画像を分割した部分領域の平均輝度から予測し、
前記予測に基づいて、大局的階調補正のトーンマッピングカーブを生成し、
前記局所的階調補正のトーンマッピングカーブと前記大局的階調補正のトーンマッピングカーブとを統合し、前記局所的階調補正と前記大局的階調補正とを同時に実行する
画像処理方法。 - 各注目画素の周辺領域の輝度を、入力画像を分割した各部分領域の平均輝度から算出する請求項1に記載の画像処理方法。
- 前記入力画像を分割した各部分領域の平均輝度を、該平均輝度値を前記周辺領域とした局所的階調補正によって補正することで、局所的階調補正後の各部分領域の平均輝度の予測値を算出する
請求項1又は請求項2に記載の画像処理方法。 - 前記局所的階調補正後の画像の全体的な輝度の予測値を、前記局所的階調補正後の各部分領域の平均輝度値の平均値を取ることで算出する
請求項3に記載の画像処理方法。 - 前記局所的階調補正後の画像の全体的なコントラストを、前記局所的階調補正後の各部分領域の平均輝度値の予測値の最大値および最小値から算出する
請求項3に記載の画像処理方法。 - 前記局所的階調補正と前記大局的階調補正との少なくとも一方のトーンマッピングカーブがガンマ補正カーブである
請求項1から請求項5のいずれかに記載の画像処理方法。 - 入力画像中の各注目画素の周辺領域の輝度によって、局所的階調補正のトーンマッピングカーブを生成する局所的階調補正用トーンマッピングカーブ生成手段と、
前記局所的階調補正後の画像の全体的な輝度又はコントラストの少なくとも一つを、前記入力画像を分割した部分領域の平均輝度から予測する予測手段と、
前記予測に基づいて、大局的階調補正のトーンマッピングカーブを生成する大局的階調補正用トーンマッピングカーブ生成手段と、
前記局所的階調補正のトーンマッピングカーブと前記大局的階調補正のトーンマッピングカーブとを統合し、前記局所的階調補正と前記大局的階調補正とを同時に実行する補正手段と
を有する画像処理装置。 - 前記局所的階調補正用トーンマッピングカーブ生成手段は、各注目画素の周辺領域の輝度を、入力画像を分割した各部分領域の平均輝度から算出する請求項7に記載の画像装置。
- 前記予測手段は、前記入力画像を分割した各部分領域の平均輝度を、該平均輝度値を前記周辺領域とした局所的階調補正によって補正することで、局所的階調補正後の各部分領域の平均輝度の予測値を算出する
請求項7又は請求項8に記載の画像処理装置。 - 入力画像中の各注目画素をその周辺領域の輝度によって、局所的階調補正のトーンマッピングカーブを生成する処理と、
前記局所的階調補正後の画像の全体的な輝度又はコントラストの少なくとも一つを、前記入力画像を分割した部分領域の平均輝度から予測する処理と、
前記予測に基づいて、大局的階調補正のトーンマッピングカーブを生成する処理と、
前記局所的階調補正のトーンマッピングカーブと前記大局的階調補正のトーンマッピングカーブとを統合し、前記局所的階調補正と前記大局的階調補正とを同時に実行する処理と
を情報処理装置に実行させる画像処理プログラム。
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