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comparison writeup/techreport.tex @ 442:d5b2b6397a5a

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added permut pixel
author Xavier Glorot <glorotxa@iro.umontreal.ca>
date Mon, 03 May 2010 18:38:27 -0400
parents bfa349f567e8
children 89a49dae6cf3
comparison
equal deleted inserted replaced
431:bfa349f567e8 442:d5b2b6397a5a
160 In both the horizontal and vertical positionning, the maximum position in either direction is such that the selected occlusion won't go beyond the borders of the occluded image. 160 In both the horizontal and vertical positionning, the maximum position in either direction is such that the selected occlusion won't go beyond the borders of the occluded image.
161 161
162 This filter has a probability of not being applied, at all, of 60\%. 162 This filter has a probability of not being applied, at all, of 60\%.
163 163
164 164
165 \subsection{Pixel permutation}
166
167 This filter permuts neighbouring pixels. It selects first $\frac{complexity}{3}$ pixels randomly in the image. Each of them are then sequentially
168 exchanged to one other pixel in its $V4$ neighbourhood. Number of exchanges to the left, right, top, bottom are equal or does not differ from more than 1
169 if the number of selected pixel is not a multiple of 4.
170
171 It has has a probability of not being applied, at all, of 80\%.
172
173
165 \subsection{Distorsion gauss} 174 \subsection{Distorsion gauss}
166 175
167 This filter simply adds, to each pixel of the image independently, a gaussian noise of mean $0$ and standard deviation $\frac{complexity}{10}$. 176 This filter simply adds, to each pixel of the image independently, a gaussian noise of mean $0$ and standard deviation $\frac{complexity}{10}$.
168 177
169 It has has a probability of not being applied, at all, of 70\%. 178 It has has a probability of not being applied, at all, of 70\%.