Patent ID: 6243499
Filing Date: 2001-06-05
Classification: G06T

Abstract:
An edge-detecting method for detecting antialiased pixels within continuous one image data representing an image, including the steps of:determining a threshold for a region of the image;in a first channel,setting a threshold to be used to binarize the region of the image, the threshold being determined as a function of a first image criterion,thresholding at least a region of the continuous tone image to create a binarized image region,extracting, from the binarized image region, a vector comprised of a predefined set of pixels within the binarized image region,applying the vector to a first channel logic operation to determine if a predefined pattern is present, and if so, indicating the presence of the pattern as a first channel output;in a second channel,setting a second threshold to be used to binarize the region of the image, the second threshold being determined as a function of a second image criterion,thresholding the region of the continuous tone image to create a second binarized image region,extracting, from the second binarized image region, a vector comprised of a predefined set of pixels within the second binarized image region,applying the vector to a second channel logic operation to determine if a second predefined pattern is present, and if so, indicating the presence of the second pattern as a second channel output; andlogically combining the outputs of at least the first channel and the second channel to produce a tag indicative of the presence or absence of a gray border within the region of the image.