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Image compression using complete and overcomplete dictionaries. Coding with an overcomplete dictionary is more efficient (fewer bits per pixel) and more accurate (lower RMSE). (a) Original image of size 256 × 256 pixels. (b) Compressed with 64×64 complete dictionary to 0.826 bits per pixel at RMSE = 0.329. (c) Compressed with 64 × 128 overcomplete dictionary to 0.777 bits per pixel at RMSE = 0.328.
