IMAGE PROCESSING APPARATUS AND METHOD OF PROCESSING IMAGE
First Claim
Patent Images
1. An image processing apparatus comprising:
- a noise reduction unit configured to generate a pre-noise reduction image obtained by reducing an impulse noise of an input image;
a smoothing unit configured to calculate a smoothed value obtained by smoothing signal levels of a plurality of pixels including a processing target pixel in a local area of the input image;
a feature amount calculation unit configured to calculate a feature amount representing an edge degree of the processing target pixel using the pre-noise reduction image; and
an addition unit configured to weighted-add a signal level of the processing target pixel and the smoothed value at a ratio corresponding to the feature amount and to output the weighted addition result as a signal level after noise reduction processing of the input image,wherein the addition unit performs the weighted addition such that as a pixel has a feature amount that represents a higher edge degree, a ratio of the smoothed value decreases.
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Abstract
An image processing apparatus calculates a smoothed value obtained by smoothing signal levels of a plurality of pixels including a processing target pixel in a local area of an input image and a feature amount representing an edge degree of the processing target pixel using a pre-noise reduction image obtained by reducing an impulse noise of the input image. The image processing apparatus weighted-adds a signal level of the processing target pixel and the smoothed value at a ratio corresponding to the feature amount and outputs the weighted-addition result as a signal level after noise reduction processing.
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11 Claims
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1. An image processing apparatus comprising:
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a noise reduction unit configured to generate a pre-noise reduction image obtained by reducing an impulse noise of an input image; a smoothing unit configured to calculate a smoothed value obtained by smoothing signal levels of a plurality of pixels including a processing target pixel in a local area of the input image; a feature amount calculation unit configured to calculate a feature amount representing an edge degree of the processing target pixel using the pre-noise reduction image; and an addition unit configured to weighted-add a signal level of the processing target pixel and the smoothed value at a ratio corresponding to the feature amount and to output the weighted addition result as a signal level after noise reduction processing of the input image, wherein the addition unit performs the weighted addition such that as a pixel has a feature amount that represents a higher edge degree, a ratio of the smoothed value decreases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An image processing method comprising:
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generating a pre-noise reduction image obtained by reducing an impulse noise of an input image; calculating a smoothed value obtained by smoothing signal levels of a plurality of pixels including a processing target pixel in a local area of the input image; calculating a feature amount representing an edge degree of the processing target pixel using the pre-noise reduction image; and weighted-adding a signal level of the processing target pixel and the smoothed value at a ratio corresponding to the feature amount and outputting the weighted addition result as a signal level after noise reduction processing of the input image, wherein in weighted-adding the signal level, as a pixel has a feature amount that represents a higher edge degree, a ratio of the smoothed value decreases. - View Dependent Claims (10, 11)
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Specification