Patent ID: 6373583
Filing Date: 2002-04-16
Classification: H03M,H04N

Abstract:
A data compression method for color image raster data, the method comprising:retaining individual pixel image data values for each recorded pixel color value of the color image raster data set that is different from both a preceding row, same column, pixel and a horizontally adjacent, same row, preceding pixel, wherein the preceding row, same column, pixel is a pixel in a pixel row superjacent a current pixel in a current row under data compression processing, the horizontally adjacent preceding pixel is an immediately previous pixel of the current pixel in the current pixel row under data compression processing; for each retained pixel image data value, encoding individual pixel image data values for pixels in a current pixel row with replacement data strings wherein the replacement data strings include a replacement positioning code and a replacement count code for replicating retained pixel image data values for subsequent raster data decompression as a group of substantially identical color value pixels; and replacing pixel image data values for current pixels with replacement data strings wherein the strings are structured in the form of a Command field and a Data field.