Image processing method and apparatus, and image processing program
First Claim
Patent Images
1. An image processing method comprising:
- separating image data into plural frequency components that are different from each other;
calculating a first evaluation value for an edge degree judgment by applying direction-specific templates to remainder frequency components other than a low-frequency component among said plural frequency components obtained by said separating step;
extracting an edge portion using said first evaluation value;
performing image enhancement processing separately for each of said plural frequency components based on a result of said extracting step of said edge portion; and
synthesizing said plural frequency components resulting from said performing step of said image enhancement processing.
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Abstract
The image processing method and apparatus separate image data into plural frequency components that are different from each other, calculate a first evaluation value for an edge degree judgment by applying direction-specific templates to remainder frequency components other than a low-frequency component among the plural frequency components, extract an edge portion using the first evaluation value, perform image enhancement processing separately for each of the plural frequency components based on a result of the extraction of the edge portion and synthesize the processed plural frequency components. The image processing program implements the image processing method.
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Citations
21 Claims
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1. An image processing method comprising:
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separating image data into plural frequency components that are different from each other; calculating a first evaluation value for an edge degree judgment by applying direction-specific templates to remainder frequency components other than a low-frequency component among said plural frequency components obtained by said separating step; extracting an edge portion using said first evaluation value; performing image enhancement processing separately for each of said plural frequency components based on a result of said extracting step of said edge portion; and synthesizing said plural frequency components resulting from said performing step of said image enhancement processing. - View Dependent Claims (2, 3, 4, 5, 6, 19)
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7. An image processing apparatus comprising:
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separation means for separating image data into plural frequency components that are different from each other; first evaluation value calculation means for calculating a first evaluation value for an edge degree judgment by applying direction-specific templates to remainder frequency components other than a low-frequency component among said plural frequency components separated by said separation means; edge portion extraction means for extracting an edge portion using said first evaluation value; image enhancement processing means for performing image enhancement processing separately for each of said plural frequency components based on a result of edge extraction by said edge portion extraction means; and synthesis means for synthesizing said plural frequency components subjected to said image enhancement processing by said image enhancement processing means. - View Dependent Claims (8, 9, 10, 11, 12, 20)
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13. A computer-readable medium on which is embodied an image processing program for implementing an image processing method,
said image processing method comprising: -
separating image data into plural frequency components that are different from each other; calculating a first evaluation value for an edge degree judgment by applying direction-specific templates to remainder frequency components other than a low-frequency component among said plural frequency components obtained by said separating step; extracting an edge portion using said first evaluation value; performing image enhancement processing separately for each of said plural frequency components based on a result of said extracting step of said edge portion; and synthesizing said plural frequency components resulting from said performing step of said image enhancement processing. - View Dependent Claims (14, 15, 16, 17, 18, 21)
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Specification