angle - gradient direction of edges

Calling Sequence

theta = angle(DeltaX, DeltaY)

Input Parameters

• DeltaX and DeltaY:M x N intensity images, resulting from convolution with gradient masks in two orthogonal directions

Output Parameters

• theta: Intensity image. Each pixel has the angle of the approximated gradient, in radians. Where DeltaX is zero, theta is taken as PI/2.

Description

The function angle obtains the gradient direction theta from images yielded from convolution with gradient masks in direction x and y (DeltaX and DeltaY, respectively).

Examples

       initial_dir = PWD;
       chdir (SIPDIR + 'images');

       Img = imread('disks.bmp');
       xbasc()
       imshow(Img,2);
       Dx = edge(Img,thresh=-1, direction='horizontal');
       Dy = edge(Img,thresh=-1, direction='vertical');
       t = angle(Dx,Dy);
       imshow(t,[])

       chdir(initial_dir);
   

Authors

Ricardo Fabbri <ricardofabbri (AT) users DOT sf DOT net>

Availability

http://siptoolbox.sourceforge.net

See Also

edge,