Math
The gradient of an image is given by the formula :
- ,
where :
- is the gradient in the x direction
- is the gradient in the y direction.
The gradient direction can be calculated by the formula :
- .
An example of a gradient patch to use is
| -1 |
| 1 |
However this will shift the image by half a pixel. The filter
| -1 |
| 0 |
| 1 |
provides a good median
Read more about this topic: Image Gradient
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