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NCIC 2000 Image Compression Algorithms—Volume IV: Flat Live-Scan Searchprint Compressions
February 2011
David J. Braunegg, The MITRE Corporation
Eric J. Donaldson, The MITRE Corporation
Richard D. Forkert, The MITRE Corporation
Margaret A. Lepley, The MITRE Corporation
Sherry L. Olson, The MITRE Corporation
ABSTRACT
Under the National Crime Information Center (NCIC) 2000 program, there is a need to compress, transmit, and decompress flat live-scan, single finger searchprints. Due to the limited bandwidth of police radios and the need for responsive transmission times, the compressed fIle size goal on average for flat live-scan searchprints is 20,000 bits. In addition to meeting the high rate of compression needed, the final decompressed fingerprint representation must maintain a high degree of ridge positional accuracy, such as minutiae points and relative ridge locations, for matching. This report presents an algorithmic process for compressing and decompressing flat live-scan searchprints. The compression algorithms were developed to remove all extraneous information from the fingerprint, thin the ridges to a single pixel width, and mathematically encode the ridge information. The decompression algorithm reverses this process to reconstruct the thinned ridge representation of the fingerprint.
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