Implementation Of Fast Cosine Transforms With Digital Signal Processors For Image Compression

Kelby K. Chan

doi:10.1117/12.968713

27 June 1988 Implementation Of Fast Cosine Transforms With Digital Signal Processors For Image Compression

Kelby K. Chan

Proceedings Volume 0914, Medical Imaging II; (1988) https://doi.org/10.1117/12.968713
Event: Medical Imaging II, 1988, Newport Beach, CA, United States

Abstract

The use of the discrete cosine transform (DCT) in imaging applications is still not as extensive as it's properties would imply, due to a comparative lack of available hardware for fast computation. Commercially available image processors typically implement the Fourier transform, and most do not have the word size necessary to handle the wide dynamic range required for radiological images with up to 2K x 2K size and 8 or more bits resolution. Efficient and easy to implement algorithms exist for the computation of the DCT. The advent of programmable single chip digital signal processors (DSP's) with fast multiplier-accumulator (MAC) units and large word sizes (24 to 32 bits) allow for hardware solutions that are economical, fast, and flexible. A special module utilizing multiple DSP's for performing the fast cosine transform (FCT) for image compression has been built. The flexibility afforded by DSP programming allows for handling of input data with different formats, dynamical scaling, and any necessary pre- or post-processing operations.

Citation Download Citation

Kelby K. Chan "Implementation Of Fast Cosine Transforms With Digital Signal Processors For Image Compression", Proc. SPIE 0914, Medical Imaging II, (27 June 1988); https://doi.org/10.1117/12.968713

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