Chapter 6. Image Enhancement and Restoration

Summary

Image enhancement techniques deal with accentuation or sharpening of image features, such as contrast, boundaries, edges, etc. Image enhancement techniques both in spatial domain and frequency domain have been discussed in this chapter. Interesting spatial domain strategies like unsharp masking, spatial filtering etc have been briefly discussed. Widely used techniques like histogram equalization and histogram hyperbolization have been presented. Frequency domain strategies which include frequency domain filtering have also been discussed. The primary difference between the enhancement and restoration techniques have been brought out here. Some of the important techniques of image restoration like inverse filtering, Wiener filter, restoration of impulse noise embedded image and blurred image have been discussed in this chapter.