LARS Tech Report Number



An adaptive transform coding technique followed by a DPCM technique is employed to code multispectral data. A method of instantaneous expansion of quantization levels by reserving two codewords in the codebook to perform a folding over in quantization is implemented for data with incomplete knowledge of probability density function. Controlled redundancy is inserted periodically as fixed length codewords into the bit string of data packed with variable length codes to facilitate fact retrieval and to detect errors. Preliminary results of several sets of data from the ERTS-1 data frame and the ERIM aircraft data frame showed that an error free reconstruction of the data can be achieved with four bits per picture element or less.

Date of this Version

January 1973