Mercurial > ift6266
comparison writeup/techreport.tex @ 425:c06a3d9b5664
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| author | Xavier Glorot <glorotxa@iro.umontreal.ca> |
|---|---|
| date | Fri, 30 Apr 2010 16:24:35 -0400 |
| parents | a3a4a9c6476d |
| children | a7fab59de174 |
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| 421:0ffef3667865 | 425:c06a3d9b5664 |
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| 190 This filter has a probability of not being applied, at all, of 75\%. | 190 This filter has a probability of not being applied, at all, of 75\%. |
| 191 | 191 |
| 192 | 192 |
| 193 \subsection{Color and Contrast Changes} | 193 \subsection{Color and Contrast Changes} |
| 194 This filter changes the constrast and may invert the image polarity (white on black to black on white). The contrast $C$ is defined here as the difference | 194 This filter changes the constrast and may invert the image polarity (white on black to black on white). The contrast $C$ is defined here as the difference |
| 195 between the maximum and the minimum pixel value of the image. A contrast value is sampled uniformly between $1$ and $1-\0.85 \times complexity}$ | 195 between the maximum and the minimum pixel value of the image. A contrast value is sampled uniformly between $1$ and $1-0.85 \times complexity}$ |
| 196 (this insure a minimum constrast of $0.15$). We then simply normalize the image to the range $[\frac{1-C}{2},1-\frac{1-C}{2}]$. The polarity | 196 (this insure a minimum constrast of $0.15$). We then simply normalize the image to the range $[\frac{1-C}{2},1-\frac{1-C}{2}]$. The polarity |
| 197 is inverted with $0.5$ probability. | 197 is inverted with $0.5$ probability. |
| 198 | 198 |
| 199 | 199 |
| 200 \begin{figure}[h] | 200 \begin{figure}[h] |