Lecture Five Figures from Gonzalez and Woods, Digital Image Processing, Second edition, Prentice-Hall,2002.

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Lecture Five Figures from Gonzalez and Woods, Digital Image Processing, Second edition, Prentice-Hall,2002.

Histogram Processing r_k is gray value n_k is frequency A histogram of an image is the graph of the frequencies of the gray level in the range [0,L-1]. r_k is gray value n_k is frequency

Probability Function

Histogram Function(1) Dark Images- Histogram components are concentrated on dark side Bright images- Components on light side Low-contrast images- Components clustered High contrast images- Spread out.

Image Enhancement in the Chapter 3 Image Enhancement in the Spatial Domain

Histogram Function (2) Normalize gray level to interval [0,1], r<- r/(L-1) Thus

Histogram Function (3) We need to compute

Image Enhancement in the Chapter 3 Image Enhancement in the Spatial Domain

Image Enhancement in the Chapter 3 Image Enhancement in the Spatial Domain

Image Enhancement in the Chapter 3 Image Enhancement in the Spatial Domain

Image Enhancement in the Chapter 3 Image Enhancement in the Spatial Domain