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Apply exp() to the Retinex output before normalization, restoring a linear tone distribution. This improves contrast overall: light gray content is preserved, and dark content stays dark even when the image contains deep blacks. The previous normalization compressed all tones toward the same gray level. Trade-off: shadows and unwanted background variations are also more visible in some images. Other: - stretch toward white using histogram mode - fall back to simple normalization on documents with large dark areas - add bilateral denoising
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Apply exp() to the Retinex output before normalization, restoring a linear tone distribution. This improves contrast overall: light gray content is preserved, and dark content stays dark even when the image contains deep blacks. The previous normalization compressed all tones toward the same gray level. Trade-off: shadows and unwanted background variations are also more visible in some images.
Other: