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Digital Image Processing Week V

Digital Image Processing Week V. Thurdsak LEAUHATONG. Sharpening Spatial Filter. First and Second Derivative. Intensity profile. Edge. 1 st derivative. 2 nd derivative. Sharpening Spatial Filter. Laplacian Sharpening.

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Digital Image Processing Week V

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  1. Digital Image Processing Week V Thurdsak LEAUHATONG

  2. Sharpening Spatial Filter First and Second Derivative Intensity profile Edge 1st derivative 2nd derivative

  3. Sharpening Spatial Filter Laplacian Sharpening Laplaciansharpening results in larger intensity discontinuity near the edge.

  4. Sharpening Spatial Filter Laplacian Sharpening Before sharpening After sharpening

  5. Sharpening Spatial Filter Laplacian of an Image

  6. 0 1 -1 0 -1 -1 1 1 -1 0 1 0 1 1 -1 -1 -8 4 -4 8 1 1 -1 -1 1 0 0 -1 -1 -1 1 1 -1 0 0 1 Sharpening Spatial Filter Laplacian Mask Used for estimatingimage Laplacian The center of the mask is positive or The center of the mask is negative Application: Enhance edge, line, point Disadvantage: Enhance noise

  7. Sharpening Spatial Filter Laplacian Mask

  8. 0 1 1 1 1 0 1 1 -4 -8 1 1 1 0 1 1 1 0

  9. -1 -1 0 -2 1 -1 -2 0 0 0 0 2 1 -1 0 2 1 1 First Order Partial Derivative: Sobel operators

  10. First Order Partial Derivative: Image Gradient Gradient magnitude A gradient image emphasizes edges

  11. First Order Partial Derivative: Image Gradient

  12. Spatial Domain Filtering : Mix things up ! D B smooth A - + Sharpening C E

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