Patent ID: 6222938
Filing Date: 2001-04-24
Classification: G06K,G06T

Abstract:
Apparatus for compensating two pixel records of related images which facilitate comparison of a parameter obtained from the related images, comprising:a first memory containing a pixel record of a first related image;a second memory containing a pixel record of a second related image;each pixel record having pixel addresses, each pixel address storing a parameter code defining a parameter level along a code scale of levels of a parameter common to the related images;pairer for establishing a set of pixel pairs in image correspondence, each pair having a first pixel from an address in the first pixel record containing an increment of the first related image, each pixel having a second pixel from a corresponding address in the second pixel record containing a corresponding increment of the second related image;sample generator for determining discrepancy between the code levels of each pixel pair in accordance with a discrepancy function, to provide an image population of code discrepancy samples between the pixel records;profile extractor for extracting a population profile of code discrepancy samples from the image population at each parameter code level to provide a series of population profiles;profile reducer for reducing each population profile to a single profile value to provide a series of single profile values, one value for each parameter code level; andpixel compensator responsive to the series of single values to provide a series of compensation data, one compensation data for each parameter code level, for compensating the stored parameter codes to provide enhanced parameter codes which facilitate comparison of the parameter obtained from the related images.