Patent ID: 6411735
Filing Date: 2002-06-25
Classification: G06K,H04N

Abstract:
A method for classifying a pixel of image data as one of a plurality of image types, comprising the steps of:(a) determining a maximum video value within a context of pixels in a vicinity of the pixel being classified; (b) determining a minimum video value within the context of pixels; (c) determining a range of video value for the pixel being classified by subtracting the minimum video value from the maximum video value; (d) determining a conditional document type classification for the pixel being classified; (e) comparing the range of video value with a predetermined threshold value; (f) classifying the pixel as a contone document type when the range of video value is less than the threshold value; and (g) classifying the pixel as the conditional document type when the range of video value is greater than the threshold value.