Publications:Orientation scanning to improve lossless compression of fingerprint images


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Title Orientation scanning to improve lossless compression of fingerprint images
Author Johan Thärnå and Kenneth Nilsson and Josef Bigun
Year 2003
PublicationType Conference Paper
HostPublication Audio-and video-based biometric person authentication : 4th International Conference, AVBPA 2003, Guildford, UK, June 9-11, 2003 : proceedings
Conference 4th International Conference on Audio- and Video- Based Biometric Person Authentication (AVBPA'03), Guildford, UK, June 9-11, 2003
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Abstract While standard compression methods available include complex source encoding schemes, the scanning of the image is often performed by a horizontal (row-by-row) or vertical scanning. In this work a new scanning method, called ridge scanning, for lossless compression of fingerprint images is presented. By using ridge scanning our goal is to increase the redundancy in data and thereby increase the compression rate. By using orientations, estimated from the linear symmetry property of local neighbourhoods in the fingerprint, a scanning algorithm which follows the ridges and valleys is developed. The properties of linear symmetry are also used for a segmentation of the fingerprint into two parts, one part which lacks orientation and one that has it. We demonstrate that ridge scanning increases the compression ratio for Lempel-Ziv coding as well as recursive Huffman coding with approximately 3% in average. Compared to JPEG-LS, using ridge scanning and recursive Huffman the gain is 10% in average.