Logarithm Contrast Enhancement

A common contrast enhancement procedure to brighten dark images is the application of a logarithm colortable. Shown below is the original image for our experiment and the logarithm color table.

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We want to map the pixel values of the original image using the logarithmic color table. Performing this operation yields

Logarithmic mapped image

• Building a visual program (workspace) in cantata
• Execute the visual program contrast-log.wk

Another Example

Example with 1D Data

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Original histogram______Logarithmic enhanced histogram