We can group the conclusions based on a level of compression and the probe sets into two parts: i) higher compression rates (0.5, 0.3 and in some cases even 0.2 bpp) seem to be suitable for recognizing faces with different expressions ( fb probe set) and images taken in different illumination conditions (fc probe set) ii) lower compression rates (1 bpp) seem to be suitable for recognizing images taken at different points in time ( dup1 and dup2 probe set). Taking this analysis into account, it seems that the current practice of deciding on the level of compression based on visual distortion of images is wrong. While the images compressed to 0.3 bpp are visually significantly distorted, the recognition results are in almost all experiments statistically indistinguishable from the results achieved by using uncompressed images. In many cases these results are slightly better and in some cases even significantly better than the ones achieved with uncompressed images.

Delac_Grgic_Face_Recognition.pdf

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