Title: Digital Image Compression by Huffman Code
Authors: TERMANINI AnselmoCOMBET MichelMORANDI Clelia
Publisher: CEC
Publication Year: 1987
JRC N°: JRC5539
Other Identifiers: EUR 11475 EN
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC5539
Type: EUR - Scientific and Technical Research Reports
Abstract: THE STORAGE AND TRANSMISSION OF DIGITAL IMAGES ARE REQUIRED IN MANY APPLICATIONS LIKE OPTICAL SURVEILLANCE, REMOTE SENSING OR EXPERIMENT AUTOMATION. IN SOME APPLICATIONS NO INFORMATION ON PIXEL LEVEL HAS TO BE LOST DURING COMPRESSION AND DECOMPRESSION, EVEN IF THE COMPRESSION FACTOR WILL BE LIMITED BY THIS CONDITION. ONE OF THESE COMPRESSION METHODS IS THE HUFFMAN CODE WITH THE BASIC IDEA THAT NOT ALL QUANTIZATION LEVELS IN AN IMAGE OCCUR EQUALLY OFTEN. HUFFMAN CODE IS A VARIABLE LENGTH CODE IN WHICH SHORTER CODES ARE ASSIGNED TO THE MOST FREQUENTLY OCCURRING LEVELS. THE RESULTING COMPRESSION DEPENDS ON THE TYPE OF INPUT IMAGE. DIFFERENT CORRELATION CASES (NORMAL, LINEAR AND CROSS-DIFFERENCE) HAVE BEEN INVESTIGATED. GOOD RESULTS ARE OBTAINED USING THE LINEAR DIFFERENCE VERSION OF HUFFMAN CODE.
JRC Directorate:Joint Research Centre Historical Collection

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