Image Processing Reference
In-Depth Information
duces unperceivable features. Figure 1(b) shows the contribution of F-pSQ in the JPEG2000
compression ratio, for example, at the eighth bit-plane, CBPF reduces 1.2423 bits per pixel
than the bit rate obtained by SQ, namely, in a 512 × 512 pixel color image, CBPF estimates that
39.75 kB of information is perceptually irrelevant at 50 cm.
Both Figures 2 and 3 depict examples of recovered images compressed at 0.9 and 0.4 bits per
pixel, respectively, by means of JPEG2000 (a) without and (b) with F-pSQ. Also these igures
show that the perceptual quality of images forward quantized by pSQ is beter than the object-
ive one.
FIGURE 2 Examples of recovered images of Lenna compressed at 0.9 bpp. (a) JPEG2000
PSNR = 31.19 dB and (b) JPEG2000-F-pSQ PSNR = 27.57 dB.
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