Patent ID: 8300120
Filing Date: 2012-10-30
Classification: G06K,G06T,H04N

Abstract:
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 as a ratio of a variance value of the signal levels of a plurality of pixels including a processing target pixel in a local area of the pre-noise reduction image to a variance value of noises of the pre-noise reduction image increases, the edge degree represented by the feature amount increases, and wherein as the edge degree represented by the feature amount increases, a ratio of a weighting of the smoothed value to a weighting of the signal level of the processing target pixel decrease.