Apparatus and method for image processing and storage medium for the same
First Claim
1. An image processing apparatus for correcting a gradation of an input image data, comprising:
- a first generating section for generating a first look up table using the input image data;
a second generating section for generating a second look up table based on the first look up table and human visual characteristics;
a combining section for generating a third look up table by combining the first and second look up tables according to a predetermined combining ratio; and
a transforming section for transforming the image data using the third look up table.
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Abstract
An apparatus and a method as well as a storage device of the present invention transform intensity levels with consideration of both features of the intensity levels in an input image and human visual characteristics, wherein the present invention includes the steps of inputting wider dynamic range digital image data, generating a histogram of intensity levels of the image data, generating a histogram equalization LUT by cumulating the histogram, generating a visual characteristics LUT with reference to the histogram equalization LUT, generating a combined LUT by combining the histogram equalization LUT and the visual characteristics LUT, and correcting the image data.
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Citations
18 Claims
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1. An image processing apparatus for correcting a gradation of an input image data, comprising:
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a first generating section for generating a first look up table using the input image data; a second generating section for generating a second look up table based on the first look up table and human visual characteristics; a combining section for generating a third look up table by combining the first and second look up tables according to a predetermined combining ratio; and a transforming section for transforming the image data using the third look up table. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image processing method for correcting a gradation of an input image data, the method comprising the steps of:
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generating a first look up table using the input image data; generating a second look up table based on the first look up table and human visual characteristics; generating a third look up table by combining the first and second look up tables according to a predetermined combining ratio; and transforming the image data using the third look up table. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A storage medium for storing a computer readable program for image processing to correct a gradation of input image data, the program comprising:
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a first generating step of generating a first look up table using the input image data; a second generating step of generating a second look up table based on the first look up table and human visual characteristics; a combining step of generating a third look up table by combining the first and second look up tables according to a predetermined combining ratio; and a transforming step of transforming the image data using the third look up table. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification