Question Bank Third ModulePart A

1. Explain 2 categories of image enhancement.2. What is contrast stretching3. What is grey level slicing4. Define image subtraction5. What is the purpose of image averaging6. What is meant by bit plane slicing7. What is a median filter?

Part - B1. What is salt and pepper noise? Illustrarte with example how median filter removes salt and

pepper noise more effectively than averaging filter.2. Explain different types of gray level transformation used for image enhancement.3. Explain histogram equalization.4. Explain histogram specification.5. Apply histogram equalization of the image whose histogram is given by

Gray Level Number of Pixels0 7901 10232 8503 6564 3295 2456 1227 81

6. Apply histogram specification of the above histogram, such that it will have a modifiedhistogram given by:Gray Level Number of Pixels

0 01 02 03 6144 8205 12286 8207 614

7. Discuss image smoothing filters with its model in the spatial domain.8. Explain spatial filtering in image enhancement.9. Explain image enhancement in frequency domain.10. Explain Homomorphic filtering in detail.