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Search options user 5623
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Suppose there is an image which is to be smoothed by convolving it with a Gaussian kernel with standard deviation $\sigma$. … If the image is then smoothed with this kernel 8 consecutive times, is the total smoothing still Gaussian with some calculable standard deviation $\hat{\sigma}$? …
asked Nov 13 '15 by barnhillec
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One smooths with a Gaussian filter, and one smooths using a second-order Savitsky-Golay filter. Let's say the window size is the same in each case. …
asked Feb 25 '15 by barnhillec
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I would like to analyse a gaussian smoothing kernel with a set standard deviation and support (let's say, in MATLAB, fspecial('gaussian', [5 1], 1.3) so sigma is 1.3 and support is 5) in the DTFT domain …
asked Feb 26 '15 by barnhillec
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Converted to the present problem, in MATLAB: kernel2 = fspecial('gaussian', [1 5], 1.3) spike = [1 0 0 0 0]; [h, w] = freqz(kernel2, spike, 1024); m = abs(h) m_db = 10*log10(m/max(m)); plot(w,m_db) … Because the compact support Gaussian had zero crossings, I used the first zero to define the stop band. …
answered Feb 27 '15 by barnhillec