Patent ID: 6657677
Filing Date: 2003-12-02
Classification: G06T

Abstract:
A video image enhancement device comprising:an edge detection unit comprising: a first circuit capable of determining whether a pixel in a video image is a candidate edge pixel by calculating a low pass second derivative for said pixel and determining that said pixel is a candidate edge pixel when said low pass second derivative crosses zero; a second circuit capable of determining whether a candidate edge pixel identified by said first circuit is located in a false edge of said video image by calculating a low pass first derivative for said candidate edge pixel and determining that said candidate edge pixel is not located in said false edge by determining that said low pass first derivative is greater than a first threshold value; and a third circuit capable of performing an edge frequency calculation for said candidate edge pixel to determine a slope of an edge in which said candidate edge pixel is located, said third circuit performing said edge frequency calculation by calculating a low pass third derivative for said candidate edge pixel and determining whether said low pass third derivative for said candidate edge pixel is greater than the product of a second threshold value and a value of said low pass first derivative for said candidate edge pixel.