image enhancement in the spatial domain - cse.iitd.ernet.inpkalra/col783/week-2.pdf · image...

Image Enhancement in the Spatial Domain


Gray Level Transformation Functions


Power Function


Power Function: Example


Power Function: Gamma Correction


Histogram


Histogram: Examples


Histogram Equalization



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Histogram Equalization : Examples


Histogram Equalization: Examples


Histogram Specification


Histogram Equalization: Local Enhancement


Image Subtraction Image Addition


Spatial Filtering


Spatial Filtering: Neighborhood Averaging


Median Filter


Median Filter: Example


Sharpening Filter


Highboost Filter


Highboost Filter: Example


Gradient Filter


Gradient Filter: Example


Laplacian Filter


Laplacian Filter: Example

Halftoning

Original Gray Scale Image

Halftoning Thresholding

Halftoning

Random Modulation

Halftoning

4-cell area method

Halftoning

Floyed Steinberg Method

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