Intensity Transform Contrast Stretching Y ← u0+γ*(Y-u)/s

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Presentation transcript:

Intensity Transform Contrast Stretching Y ← u0+γ*(Y-u)/s Log-transform (medical images, etc.) Y ← β*(log2 (1+Y))-1, e.g., β=32 16-bit  8-bit representation Y ← (1+Y)1/2 -1, or Y ← Y/257 Negative Image Y ← 255-Y Mean Filtering Median Filtering Histogram Equalization

Results of Contrast Stretching

Log-transform and Negative

Mean and Median Filtering 1 2 9 1 2 Mean of 9 pixel values Median of 9 pixel values 1 2

Histogram Equalization (1)

Histogram Equalization (2)

Histogram Equalization (3)

Histogram Equalization (4)

Histogram Equalization (5)

Histogram Equalization (6)