3 Spatial filtering (a) Add noise to an image whose maximum intensity is close to 255 on a scale of 0-255 using 20*randn (standard deviation of 20, mean of 0). (b) Use a Sobel edge detector to display the edges in an image. (c) Low-pass filter the original image before detecting edges using two different filters (uniform and Gaussian as in Fig. 3.32) in an attempt to obtain smooth edges.

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