In high-speed color image processing applications, it is desired to manipulate DCT-domain images in real time. Because of throughput requirements, operations required for the building of a printer page, such as merging and shifting, cannot be performed in the sampled domain the overhead associated with the DCT slows computation. In this paper we present an efficient method for the merging or shifting of JPEG-compressed images, performed in the DCT domain to avoid additional overhead. The algorithm exploits quantization to achieve further gains. The resulting algorithm can save between 25% and 75% of the required operation cycles in a typical image processing system.
By: Timothy J. Trenary, Charles A. Micchelli, J. Q. Trelewicz, Marco Martens, Joan L. Mitchell
Published in: RC22238 in 2001
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