Bit-plane Slicing
Histogram Equalization
- Use previous lecture links.
- GW:Figure 3.17 & 3.18 is an excellent example.
Histogram Specification
- Obtain the histogram of the given image.
- Use equalization to precompute a mapped level s(k) for each level r(k).
- Obtain the transformation function G from the specified histogram using equalization.
- Precompute z(k) for each value s(k).
- For each pixel in the original image, if the value of that pizel is r(k), map this value to the corresponding level s(k); then map level s(k) into the final level z(k). Use precomputed values for these mappings.
Original image.
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Local Processing
- Local Equalization GW Fig 3.23
- Local Statistics GW Fig 3.26