SIP - Scilab Image Processing Toolbox >> SIP - Scilab Image Processing Toolbox > getangle

getangle

gradient direction of edges

Calling Sequence

theta = getangle(DeltaX, DeltaY)

Parameters

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.

Description

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).

Examples

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

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

chdir(initial_dir);

Authors

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

Availability

The latest version of SIP can be found at

http://siptoolbox.sf.net