Under the National Crime Information Center (NCIC) 2000 program, there is a need to compress, transmit, and decompress flat live-scan, single finger searchprints.
NCIC 2000 Image Compression Algorithms Volume IV: Flat Live-Scan Searchprint Compressions
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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.