Patent ID: 7130483
Filing Date: 2006-10-31
Classification: G06T,H04N

Abstract:
1. A method for enhancing an image, which comprises: obtaining a first image signal including pixel values; obtaining a high-pass image signal having high-frequency components of the first image signal; obtaining a positive non-zero weighting factor to control a degree of enhancement; selecting edge pixel values representing a boundary of an edge in the first image by evaluating two independent boundary-indicating conditions per pixel, including the steps of: evaluating if at least one side of the pixel is a constant image region, and evaluating if the pixel itself is not in a constant image region, such that if both conditions are satisfied then concluding that the given one of the pixel values of the first image represents the boundary of the edge; for suppressing shoots, defining a gain suppressing function having attenuation coefficients to be multiplied with particular pixel values of the high-pass image signal corresponding in location to the edge pixel values; multiplying the high-pass image signal by the weighting factor and by the gain suppressing function to obtain a result; and adding the result to the first image signal to obtain an enhanced image signal in which the shoots have been suppressed.