WSQ .NET Library - Gray-scale Fingerprint Image Compression

.NET managed library
.NET Compact Framework support (prerease available)
Encoding WSQ images
Decoding WSQ images

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* Runtime License is not valid for developers and development computer installation. Each developer requires developer license. If you have one developer and two client computers you need one single developer license and two runtime licenses.

The Wavelet Scalar Quantization (WSQ) class of encoders involves a decomposition of the fingerprint image into a number of subbands, each of which represents information in a particular frequency band. The subband decomposition is achieved by a discrete wavelet transformation (DWT) of the fingerprint image.

Each of the subbands is then quantized using values from a quantization table. No default values for quantization tables are given in this Specification. The quantized coefficients are then passed to a Huffman encoding procedure which compresses the data.

Huffman table specifications must be provided to the encoder. Figure 1 shows the main procedures for WSQ encoding and decoding. The same tables specified for an encoder to use to compress a particular image must be provided to a decoder to reconstruct that image.

Original Image		JPEG Compression (ratio 14.28)


Original Image		WSQ Compression (ratio 14.28)

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