Patent ID: 6175659
Filing Date: 2001-01-16
Classification: G06T

Abstract:
A method for image scaling using adaptive edge enhancement, comprising the steps of:providing a plurality of sets of gradient threshold values and enhancement threshold values that correspond respectively to predetermined enhancement modes;computing a mean pixel value for a one-dimensional pixel array that includes a center pixel to be updated and neighboring pixels of the center pixel;selecting one of the enhancement modes based on the mean pixel value;selecting one of the sets of gradient threshold values and enhancement threshold values based on the selected one of the enhancement modes;computing a sharpness value by adding together absolute values of differences between values of the center pixel and each of the neighboring pixels;selecting one of the enhancement threshold values in the selected one of the sets by comparing the sharpness value with the gradient threshold values in the selected one of the sets;determining a sign of the selected one of the enhancement threshold values such that difference between left side brightness and right side brightness is increased when the selected one of the enhancement threshold values is added to the value of the center pixel; andupdating the center pixel by adding the selected one of the enhancement threshold values to the value of the center pixel while taking into account the sign of the selected one of the enhancement threshold values, thereby resulting in an edge-enhanced image.