(Answered) Question a sampled gaussian kernel must alias because the

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Question: A sampled Gaussian kernel must alias, because the kernel contains components at arbitrarily high spatial frequencies. Assume that the kernel is sampled on an infinite grid. As the standard deviation gets smaller, the aliased energy must increase. Plot the energy that aliases against the standard deviation of the Gaussian kernel in pixels. Now assume that the Gaussian kernel is given on a 7x7 grid. If the aliased energy must be of the same order of magnitude as the error due to truncating the Gaussian, what is the smallest standard deviation that can be expressed on this grid?

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