Coding of Irregular Image Regions by SA DFT
In the paper the new transform adapting to shapes of irregular image segments is introduced, the shape-adaptive (SA) DFT. Its definition is based on periodic data extension rather than data shifts, hence, in contrast to SA DCT segment reconstruction is possible even if part of contour data is missing. Visually the quality of images reconstructed from the part of SA DFT samples is almost as good as for the SA DCT, especially for high compression ratios.
Keywordsshape adaptive transform Discrete Cosine Transform Discrete Fourier Transform
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