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90 3 Image processing

(a) (b)

(c) (d)

(e) (f)

Figure 3.2 Some local image processing operations: (a) original image along with its three color (per-channel)
histograms; (b) brightness increased (additive offset, b =16); (c) contrast increased (multiplicative gain, a =1.1);
(d) gamma (partially) linearized (γ =1.2); (e) full histogram equalization; (f) partial histogram equalization.