Image Processing Reference
In-Depth Information
shows the examples when MaxShift and GBbBShift methods, respectively, are applied to the
H
i
-SET coder.
FIGURE 7
512 × 512 pixel Image
1600
from CSIQ image data base with 8 bpp. ROI is a
patch at the center of the image, whose size is 1/16 of the image. Decoded images at
0.42 bpp using
φ
= 8 for MaxShift method (a) in JPEG2000 coder and (b) in H
i
-SET coder,
and BPmask = 1111000110110000 for (c) GBbBShift and (d) ρGBbBShift methods in H
i
-SET
coder.
Similarly, when an ROI area is defined in Image Lenna,
Figure 8(a) and (b)
shows the com-
parison among MaxShift (Blue Function), GBbBShift (Green Function), and GBbBShift (Red
Function) methods applied to H
i
-SET coder. 512 × 512 pixel Image Lenna for grayscale is em-
ploy for this experiment. These figures also show that the ρGBbBShift method gets the bet-
ter results both in PSNR (objective image quality,
Figure 8(a)
)
and CwPSNR (subjective im-
age quality,
Figure 8(b)
) in contrast to MaxShift and GBbBShift methods. In addition, when
MaxShift method applied to JPEG2000 coder and ρGBbBShift applied to H
i
-SET coder are
compared, ρGBbBShift obtains less objective quality (
Figure 8(c)
), but beter subjective quality
for grayscale images (
Figure 8(d)
).
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