pprewitt

Computes the Prewitt gradient magnitude.

pprewitt [-m mask] [im_in|-] [im_out|-]

pprewitt computes an approximation of the gradient magnitude of the input image im_in.

The algorithm uses the convolution with the following kernel:

   |+1 +1 +1|
   |+0 +0 +0|
   |-1 -1 -1|

The kernel is oriented in two directions: 0 and 90 degrees and the magnitude value is set to the maximum value between these two values.

The output image im_out is of the same type as the input image im_in.

Returns SUCCESS or FAILURE.

Performs an edge detection for the tangram.pan image:

   pprewitt tangram.pan b.pan
   pbinarization 40 1e30 b.pan out.pan

Errc PPrewitt( const Img2duc &im_in, Img2duc &ima );

Module du gradient de Prewitt.

Author: Régis Clouard