Method and system for adjusting image brightness based on color saturation components
First Claim
Patent Images
1. A method for adjusting image brightness comprising the steps of:
- effecting a computation on color image data represented by a color signal composed of at least three components to obtain pixel lightness components and an average brightness of an image;
adjusting brightness of the image represented by the color image data based on the lightness components; and
adjusting the brightness of the image represented by the color image data based on the average brightness of the image,wherein the average brightness of the image is adjusted with color saturation components of the pixels, andwherein the step of adjusting the brightness of the image represented by the color image data based on color saturation components of the pixels is effected by computing weighted lightness components by weighting the lightness components of the pixels by the color saturation components of the pixels, computing mean values of the weighted lightness components, and adjusting the brightness by converting the color image data to make the mean values desired values.
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Abstract
A method for adjusting image brightness is conducted by a system for adjusting image brightness. Digital image data acquired by a data acquisition unit are sent to a lightness computing unit and a color saturation computing unit that compute the lightness L and the color saturation C for every pixel and sends the computed values to a mean value computing unit. The mean value computing unit weights the lightness L by the color saturation C and computes weighted mean values Lm of the lightnesses L. A converter 5 converts the R, G, B color signal components constituting the digital image data S to make the weighted mean values Lm desired values.
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Citations
20 Claims
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1. A method for adjusting image brightness comprising the steps of:
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effecting a computation on color image data represented by a color signal composed of at least three components to obtain pixel lightness components and an average brightness of an image; adjusting brightness of the image represented by the color image data based on the lightness components; and adjusting the brightness of the image represented by the color image data based on the average brightness of the image, wherein the average brightness of the image is adjusted with color saturation components of the pixels, and wherein the step of adjusting the brightness of the image represented by the color image data based on color saturation components of the pixels is effected by computing weighted lightness components by weighting the lightness components of the pixels by the color saturation components of the pixels, computing mean values of the weighted lightness components, and adjusting the brightness by converting the color image data to make the mean values desired values. - View Dependent Claims (2)
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3. A system for adjusting image brightness comprising an adjuster having an adjustment unit configured for effecting a computation on color image data represented by a color signal composed of at least three components to obtain pixel lightness components and an average brightness of an image and adjusting brightness of the image represented by the color image data based on the lightness components, the system being characterized in that the adjustment unit is further configured for adjusting the brightness of the image represented by the color image data based on the average brightness of the image, wherein the average brightness of the image is adjusted with color saturation components of the pixels,
wherein the adjuster includes weighted lightness component computing means for computing weighted lightness components of the pixels by weighting the lightness components of the pixels by the color saturation components of the pixels, mean value computing means for computing mean values of the weighted lightness components, and conversion means for converting the color image data to make the mean values desired values.
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5. A device for adjusting brightness of an image, comprising:
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a data acquisition unit configured to acquire image data of the image; and an adjustment unit configured to adjust a brightness of the image based on an average brightness of the image, wherein the average brightness of the image is adjusted with a color saturation of the image data from said data acquisition unit, wherein the adjustment unit comprises; a lightness computing unit configured to compute lightness of the image data; a color saturation computing unit configured to compute color saturation of the image data; a mean value computing unit configured to compute mean values of the lightness computed by the lightness computing unit based on the colour saturation computed by the color saturation unit; and a converting unit configured to convert the brightness of the image data based on the mean values computed by the mean value computing unit. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12)
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13. A method for adjusting brightness of an image, comprising:
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acquiring image data of the image; and adjusting a brightness of the image based on an average brightness of the image, wherein the average brightness of the image is adjusted with a color saturation of the image data, wherein the adjusting step comprises; computing lightness of the image data; computing color saturation of the image data; computing mean values of the lightness of the image data; and converting the brightness of the image data based on the mean values of the lightness of the image data. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification