Image processing apparatus and method, and program
First Claim
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1. An image processing apparatus which changes a dynamic range of an image, comprising:
- histogram generation means for generating at least one of a density value histogram and a differential histogram of the image;
LUT generation means for generating an LUT used for changing the dynamic range of the image on the basis of a histogram value in each pixel value interval of the histogram generated by said histogram generation means; and
changing means for changing the dynamic range of the image on the basis of the LUT generated by said LUT generation means.
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Abstract
A histogram is generated on the basis of the pixel value of an image. An LUT used for changing the dynamic range of the image is generated on the basis of the histogram value in each pixel value interval of the generated histogram. The dynamic range of the image is changed on the basis of the generated LUT.
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Citations
10 Claims
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1. An image processing apparatus which changes a dynamic range of an image, comprising:
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histogram generation means for generating at least one of a density value histogram and a differential histogram of the image;
LUT generation means for generating an LUT used for changing the dynamic range of the image on the basis of a histogram value in each pixel value interval of the histogram generated by said histogram generation means; and
changing means for changing the dynamic range of the image on the basis of the LUT generated by said LUT generation means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image processing method of changing a dynamic range of an image, comprising:
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a histogram generation step of generating at least one of a density value histogram and a differential histogram of the image;
an LUT generation step of generating an LUT used for changing the dynamic range of the image on the basis of a histogram value in each pixel value interval of the histogram generated in the histogram generation step; and
a changing step of changing the dynamic range of the image on the basis of the LUT generated in the LUT generation step.
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10. A program which implements image processing of changing a dynamic range of an image, comprising:
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a program code for a histogram generation step of generating at least one of a density value histogram and a differential histogram of the image;
a program code for an LUT generation step of generating an LUT used for changing the dynamic range of the image on the basis of a histogram value in each pixel value interval of the histogram generated in the histogram generation step; and
a program code for a changing step of changing the dynamic range of the image on the basis of the LUT generated in the LUT generation step.
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Specification