# (Homework Solution): 4) In this problem, you will investigate a more efficient way to implement spatial filtering

4) In this problem, you will investigate a more efficient way to implement spatial filtering when all the filter coefficients have the same value. The motivation comes from the observation that as you slide the filter one pixel at a time over the image and compute the sum-of-products of image and filter values, you can use the results from the previous computation in the current computation. Although the method can be genera all the filter coefficients have the value 1. And, we will also ignore the 1/n’ scaling factor that typically accompanies an averaging filter of size nxn. lized, we will consider the case in which (a) Describe the algorithm you would use to compute the output value at location (x,y) given that you have already computed the result for location (x- 1,y), for example, for an averaging filter of size nxn (think about what changes when you shift the filter by one pixel) (b) How many additions (in terms of n) does this require for each output pixel. Count subtractions as additions (c) Now, le’s compare this with the standard approach of not using previous results. How many additions are required for each output pixel in this case This should be in terms ofn. (d) Compute the computational advantage of the more efficient approach. This is simply the ratio of the number of additions required by the standard approach to the number of additions required by the more efficient approac Again, this should be in terms of n.

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