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Restoration of Wavelet-Compressed Images and Motion Imagery
Restoration of WaveletCompressed Images and Motion Imagery Author:Mark A. Robertson This is a AIR FORCE RESEARCH LAB ROME NY INFORMATION DIRECTORATE report procured by the Pentagon and made available for public release. It has been reproduced in the best form available to the Pentagon. It is not spiral-bound, but rather assembled with Velobinding in a soft, white linen cover. The Storming Media report number is A298024. The abs... more »tract provided by the Pentagon follows: This technical report investigates the characteristics of compression noise in images and motion imagery compressed by scalar quantization of the data's two- or three-dimensional wavelet transform coefficients. Such quantization noise is both experimentally and theoretically shown to be spatially varying in the pixel domain, with statistical correlations between the errors at the pixel locations. A quantization noise covariance matrix is presented that can find use in general restoration scenarios where the observed image or images have been compressed by scalar quantization of the data's wavelet coefficients. Several restoration examples, including de-blurring for the single-image case and temporal filtering for the motion-imagery case, are provided to demonstrate the quantization noise model's advantage over the common assumption of independent and identically distributed noise. (7 tables, 19 figures, 29 refs.)« less