System of data compression by subsampling, and preferably adapti

Details System of data compression by subsampling, and preferably adapti System of data compression by subsampling, and preferably adapti

1997-01-13

1999-12-21

Tran, Phuoc

Image analysis

Image compression or coding

382245, 382300, G06K 936, G06K 946

Patent

active

060059796

ABSTRACT:
Pixel-based image data are subsampled for transmission to a printer and later bilinear interpolation in the printer. The transmission system evaluates the error that will remain after interpolation. In response to this evaluation, the transmission system also forms trim data for later application to the interpolated subsample to remove a significant part of the error. Preferably trim data points are selected based on relative importance of the associated correction--specifically, size of the error that will remain after interpolation--but also the amount of trim data is controlled to maintain a significant advantage in overall transmission time, relative to transmitting the entire image-data set. The amount of trim data is held roughly to a certain fraction, about five percent, of the number of points in each data block (e. g., swath), essentially independent of the error evaluation. Preferably this controlled amount of trim data is padded out with zeroes to form a complete trim-data array--which is then run-length encoded. The encoded trim data and the subsample are sent to the printer. (Preferably pure-text portions are sent separately.) The printer applies the trim data to the interpolated subsample to obtain a better approximation to the original image data.

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