Digital Signal Processing Reference
In-Depth Information
Figure 14-1.
DWT (level-1)
Figure 14-2.
(a) Difference image (Horizontal), (b) Vertical DWT-detail
Fig. 14-2(a) and 14-2(b) are the horizontal directional difference image of
the DWT approximation and the vertical DWT detail respectively. And in
fact the cross correlation coefficient between these two images is relatively
large (in the above image it is 0.735). Similarly the horizontal DWT detail
looks like the vertical directional (one dimensional) difference image of the
