1. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Digital Image Processing Spatial Domain Filtering: Part II

2. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Order-Statistics Filters Median filter a 1 < a 2 < … < a n then median is a (1+n)/2

3. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Median filters Corrupted by salt and pepper noise Averaging filter Median filter © 2002 R. C. Gonzalez & R. E. Woods

4. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Sharpening Spatial Filters

5. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Sharpening Spatial Filters The Laplacian

6. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Sharpening Spatial Filters The 2D Laplacian

7. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Sharpening Spatial Filters The 2D Laplacian

8. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Sharpening Spatial Filters The 2D Laplacian If the center coefficient of the Laplacian mask is negative If the center coefficient of the Laplacian mask is positive

9. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Sharpening Spatial Filters The 2D Laplacian

10. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing The First Derivatives for Enhancement The Gradient

11. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing The First Derivatives for Enhancement The Gradient

12. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing The First Derivatives for Enhancement The Sobel Operator

13. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing The First Derivatives for Enhancement The Sobel Operator Horizontal Vertical

14. Gholamreza Anbarjafari, PhD Video Lecturers on Digital Image Processing Summary We have looked at: –What are statistical filters. –What are Laplacian and Gradient. –What is Sobel operator.