IMAGE PROCESSING APPARATUS, IMAGE PROCESSING METHOD, AND IMAGE PROCESSING PROGRAM
First Claim
1. An image processing device comprising:
- a generation unit that calculates an edge strength based on a stairs tone strength indicative of differences between a first parameter and a second parameter, wherein the first parameter is a first gradient based on pixel values of a pixel of interest in an input image and of adjacent pixels included in a first range with respect to the pixel of interest, the second parameter is one of a variance based on pixel values of the pixel of interest and of the adjacent pixels and a second gradient based on pixel values of adjacent pixels included in a second range wider than the first range; and
a smoothing processor that performs a nonlinear smoothing operation on the pixel values of the pixel of interest and the adjacent pixels included in the first range, based on the calculated edge strength.
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Abstract
An image processing device includes a generation unit and a smoothing processor. The generation unit calculates an edge strength on the basis of a stairs tone strength indicative of differences between a first parameter and a second parameter. The first parameter is a first gradient based on pixel values of a pixel of interest in an input image and adjacent pixels included in a first range with respect to the pixel of interest. The second parameter is one of a variance based on pixel values of the pixel of interest and the adjacent pixels, and a second gradient based on the pixel value of the pixel of interest and adjacent pixels included in a second range. The smoothing processor performs a nonlinear smoothing operation on the pixel value of the pixel of interest and the adjacent pixels included in the first range on the basis of the calculated edge strength.
25 Citations
20 Claims
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1. An image processing device comprising:
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a generation unit that calculates an edge strength based on a stairs tone strength indicative of differences between a first parameter and a second parameter, wherein the first parameter is a first gradient based on pixel values of a pixel of interest in an input image and of adjacent pixels included in a first range with respect to the pixel of interest, the second parameter is one of a variance based on pixel values of the pixel of interest and of the adjacent pixels and a second gradient based on pixel values of adjacent pixels included in a second range wider than the first range; and a smoothing processor that performs a nonlinear smoothing operation on the pixel values of the pixel of interest and the adjacent pixels included in the first range, based on the calculated edge strength. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An image processing method comprising:
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calculating an edge strength based on a stairs tone strength indicative of differences between a first parameter and a second parameter, the first parameter being a first gradient based on pixel values of a pixel of interest in an input image and of adjacent pixels included in a first range with respect to the pixel of interest, the second parameter being one of a variance based on pixel values of the pixel of interest and the adjacent pixels and a second gradient based on pixel values of adjacent pixels included in a second range wider than the first range; and performing a nonlinear smoothing operation on the pixel values of the pixel of interest and the adjacent pixels included in the first range, based on the calculated edge strength. - View Dependent Claims (15, 16, 17)
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18. A non-transitory recording medium for storing a program for instructing a computer to perform a method for processing an image, the method comprising:
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calculating an edge strength based on a stairs tone strength indicative of differences between a first parameter and a second parameter, the first parameter being a first gradient based on pixel values of a pixel of interest in an input image and of adjacent pixels included in a first range with respect to the pixel of interest, the second parameter being one of a variance based on pixel values of the pixel of interest and of the adjacent pixels and a second gradient based on pixel values of adjacent pixels included in a second range wider than the first range; and performing a nonlinear smoothing operation on the pixel values of the pixel of interest and of the adjacent pixels included in the first range, based on the calculated edge strength. - View Dependent Claims (19, 20)
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Specification