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SDKs - Biometric Image Compression

Aware WSQ1000

 

Features & Functionality

  • Fast, reliable compression and decompression of critical fingerprint image data
  • Technology developed, maintained, and fully supported by Aware
  • Complete, fully-featured API facilitates efficiency and ease of use
  • Efficient transcoding from 1000 ppi JPEG 2000 images to 500 ppi WSQ images
  • Support for all necessary JPEG 2000 compression options and comment insertion into the JPEG 2000 or WSQ codestreams
  • Precise rate control, enabling compression to within 1% of specified ratio, file size, or bit rate (bits/pixel)
  • Fully featured C Language API
  • C#/.NET wrappers
  • Example programs with source
  • Java Native Interface support
  • Support for
    - Microsoft Windows
    - Linux Support
    - Sun Solaris
    - HP-UX
    - IBM AIX
    - Apple iOS
    - Blackberry Java

High-Performance, FBI-Certified WSQ Compression of Fingerprint Images with JPEG 2000 Compression and Transcoding for 1000 ppi Images

Aware WSQ1000 is an SDK providing the industry’s highest-performing, FBI-certified implementation of the WSQ compression algorithm for fingerprint images. WSQ (Wavelet Scalar Quantization) is a wavelet-based compression standard designed and specified by the FBI for compression of high-resolution, 500 ppi grayscale fingerprint images. Aware WSQ1000 includes JPEG 2000 compression for 1000 ppi images and efficient transcoding between WSQ and JPEG 2000.

Aware WSQ1000 was the first commercial implementation of the gray scale fingerprint image compression standard.  Its origins date back to 1994-1995 when Aware participated in a standards forum with US government agencies and several US universities to develop a lossy compression algorithm specifically for gray scale fingerprint data.  A wavelet-based technique known as Wavelet Scalar Quantization (WSQ) was adopted.

Today, most of the world’s large, high throughput, fingerprint management and matching systems depend on Aware WSQ1000 to manage the compression and decompression of finger and palm image data.  All finger and palm images submitted to the FBI are managed by Aware WSQ1000.

Aware WSQ1000 is the choice of most large state and federal systems because of its:

  • Runtime performance. Aware WSQ1000 is 4-5 times faster than most other WSQ implementations that share a common code base
  • Error resilience. Aware WSQ1000 has been exposed to and processed more images than any other implementation of the standard.  It will not crash or bring a system down when presented with a non-compliant, truncated, very large, or unusually formatted image.
  • Dedicated support and maintenance. Aware WSQ1000 is a high quality commercial implementation designed and maintained by professional software engineers explicitly for demanding production environments
  • Continuous compliance certification with the FBI.  All finger and palm images compressed with Aware WSQ1000 contain an encoder ID assigned by the FBI which is specific to the operating system and revision of the software.  Compliance testing and certification is important because the purpose of the standard is to ensure minimal data loss of friction ridge detail.  The WSQ standard is of minimal value without compliance assurance.

Section of a digital fingerprint image that has been compressed 15:1 with the JPEG algorithm. Note the block artifact that is inherent in the algorithm. The image has
been zoomed by 4.

Section of the same fingerprint image that has been compressed 15:1 with the WSQ algorithm. Note the absence of the block artifact. The image has been zoomed by 4.

Support for 1000 ppi images

The FBI has published a standard for the compression and formatting of 1000 ppi fingerprint and palm images, called “Profile for 1000 ppi Fingerprint Compression.” This standard requires the use of JPEG 2000 for compression and formatting of 1000 ppi fingerprint images. WSQ will continue to be used for 500 ppi images. Like WSQ, JPEG 2000 uses a wavelet-based compression algorithm that performs particularly well for large images. It is an established ISO/IEC standard used extensively for applications involving large images including medical imaging, digital archiving, and digital cinema. The JPEG 2000 standards are complex, with many variable settings intended to help optimize its use for different applications. The FBI 1000 ppi profile includes several mandatory encoding parameters to ensure the optimization of JPEG 2000 for fingerprints. The FBI’s IAFIS and most legacy AFIS systems will continue to require 500 ppi WSQ compressed data. In order to enable 1000 ppi fingerprints to be used in both 1000 ppi and 500 ppi systems, Aware WSQ1000 enables efficient transcoding from 1000 ppi JPEG 2000 images to 500 ppi WSQ images.

 

 

 


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