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We discussed in class why the spatial result is more blurry than the original image; could someone explain why this is the case? Also, why do originally smooth parts of the image (e.g. the background) now have ripples?


The original image has been filtered to only include low frequencies. This means that changes in the image are less sharp, and more blurry (intuitively, high frequency waves should have more sudden changes in the tone of the image). The background is more blurry because these high frequency waves provide the minute changes in detail that would appear to "smooth" the background. Now, the image is composed only of low frequency waves, part of which have become more apparent without the high frequency waves to offset them.