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Dilation

Dilation. The basic morphological operations applied to either grayscale or binary images are Erosion and Dilation. Erosion shrinks image objects while dilation expands them. Course Name: Digital Image Processing Level(UG/PG): UG Author(s) : Phani Swathi Chitta

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Dilation

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  1. Dilation The basic morphological operations applied to either grayscale or binary images are Erosion and Dilation. Erosion shrinks image objects while dilation expands them. • Course Name: Digital Image Processing Level(UG/PG): UG • Author(s) : Phani Swathi Chitta • Mentor: Prof. Saravanan Vijayakumaran *The contents in this ppt are licensed under Creative Commons Attribution-NonCommercial-ShareAlike 2.5 India license

  2. Learning Objectives After interacting with this Learning Object, the learner will be able to: • Explain the basic morphological operation (Dilation)

  3. Definitions of the components/Keywords: • Characteristics of Dilation - Dilation generally increases the sizes of objects, filling in holes and broken areas, and connecting areas that are separated by spaces smaller than the size of the structuring element. - With grayscale images, dilation increases the brightness of objects by taking the neighborhood maximum when passing the structuring element over the image. - With binary images, dilation connects areas that are separated by spaces smaller than the structuring element and adds pixels to the perimeter of each image object. • The dilation operator takes two pieces of data as inputs. - The first is the image which is to be dilated. - The second is a (usually small) set of coordinate points known as a structuring element (also known as a kernel). • It is this structuring element that determines the precise effect of the dilation on the input image. • In dilation, every background pixel that is touching an object pixel is changed into an object pixel. Dilation makes the objects larger, and can merge multiple objects into one. 1 2 3 4 5

  4. Master Layout 1 1 Image after dilation Original Image 2 3 • Give radio buttons to select any one structuring element of sizes 5x5, 7x7, 11x11 • The structuring elements (SE) are 4 5

  5. Step 1: 1 2 3 4 5

  6. Step 2: 1 2 3 4 5

  7. Step 3: 1 2 3 4 5

  8. Step 4: 1 2 3 4 5

  9. Step 6: 1 2 3 4 5

  10. Step 7: 1 2 3 4 5

  11. Step 8: 1 2 3 4 5

  12. Electrical Engineering Slide 1 Slide 3 Slide 23, 24,25 Slide 26 Introduction Definitions Analogy Test your understanding (questionnaire)‏ Lets Sum up (summary)‏ Want to know more… (Further Reading)‏ Interactivity: Try it yourself • Select any one of the figures • a b • c d • Select the structuring element 12 Credits

  13. Questionnaire 1 1.After dilating the image, will the number of background pixels increase or decrease? Answers: a) Increase b) Decrease 2 3 4 5

  14. Questionnaire 1 2. Image a Image b:Structuring Element What is the resulting image after dilating the image a using structuring element (image b)? Answers: a)b) 2 3 4 5

  15. Questionnaire 1 2. Image a Image b:Structuring Element What is the resulting image after dilating the image a using structuring element (image b)? Answers: c) d) 2 3 4 5

  16. Links for further reading Reference websites: http://siri.lmao.sk/fiit/DSO/Prednasky/2a Morphological processing Recap & Extend / Digital Image Processing Lecture Morphological processing Recap &Extend.pdf http://en.wikipedia.org/wiki/Dilation_%28morphology%29 http://homepages.inf.ed.ac.uk/rbf/HIPR2/dilatedemo.htm http://homepages.inf.ed.ac.uk/rbf/HIPR2/dilate.htm Books: Digital Image Processing – Rafael C. Gonzalez, Richard E. Woods, Third edition, Prentice Hall

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