Transformation

Logarithmic vs Nth root transformation of Image

Logarithmic vs Nth root transformation of Image
  1. Why log transformation is used in image processing?
  2. What is the difference between log transformation and power-law transformation?

Why log transformation is used in image processing?

During log transformation, the dark pixels in an image are expanded as compare to the higher pixel values. The higher pixel values are kind of compressed in log transformation. This result in following image enhancement. The value of c in the log transform adjust the kind of enhancement you are looking for.

What is the difference between log transformation and power-law transformation?

The difference between the log- transformation function and the power-law functions is that using the power-law function a family of possible transformation curves can be obtained just by varying the λ.

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