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Can anybody explain me how gaussian smoothing works for image smoothing? I mean to say how does that affect the image after operation. What changes it makes to image pixels, so that we get less noisy image? tx. |
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Gaussian smoothing
Started by ●March 29, 2004
Reply by ●March 29, 20042004-03-29
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--- In , "ujjavalsuthar" <ujjavalsuthar@y...> wrote: > Can anybody explain me how gaussian smoothing works for image > smoothing? > I mean to say how does that affect the image after operation. What > changes it makes to image pixels, so that we get less noisy image? > > tx. It uses the same principle as a common averaging algorithm average = SUM w(i)*x(i) athough in case of averaging, the weights are all 1/N, while gaussian smoothing uses gaussian weights. Thus, averaging a pixel value over a close region to it and using non rectangular weight function, has the same effect of getting a mean estimate from a set of values of a random variable. It removes noise in the outer (high frequency) part of the spectum, however the image might also be contaminated in the center (low frequency) part of the spectrum. Rgds, Andrew |
Reply by ●March 29, 20042004-03-29
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Hi all, I have to built a optimized zoom in a PAL Picture for a DSP application. I want to know if someone has alredy do this sort of algorithm. In this case, what sort of interpolation have you used ? (bicubic, nearest neighbor, fratal) Is it possible to use a Zero Padding algorithm ? Is it possible to use a covolution ? Any enlightening ideas, suggestions, comments will be greatly appreciated. Thanks in advance, Adrien Bonjour, Je travaille actuellement sur un algorithme de Zoom pour une application DSP (format de l'image PAL) Est ce que quelqu'un a dtravaillsur un algorithme de zoom ? Quel type d'interpolation avez vous utilis ? (bicubic, nearest neighbor, fratal) Est ce qu'il est possible d'utiliser un algorithm basbr /> sur du Zero Padding ? Est ce qu'il est possible de traiter l'image avec une covolution ? Je suis preneur de toutes les ids, conseils, commentaires, suggestions qui pourront m'aider. D'avance merci Adrien Dialoguez en direct avec vos amis gre Yahoo! Messenger !Thargez Yahoo! Messenger sur http://fr.messenger.yahoo.com |
