gradient direction of edges

theta = getangle(DeltaX, DeltaY)

- DeltaX DeltaY
`M x N`

intensity images, resulting from convolution with gradient masks in two orthogonal directions- theta
- Intensity image. Each pixel has the getangle of the approximated
gradient, in radians. Where
`DeltaX`

is zero,`theta`

is taken as PI/2.

The function `getangle`

obtains the gradient direction `theta`

from images yielded from convolution with gradient masks in direction x and y (`DeltaX`

and `DeltaY`

, respectively).

- Ricardo Fabbri <ricardofabbri[at]users.sf.net>

http://siptoolbox.sf.net