ANISOEDGE_BASE - Base function for ANISOEDGE.

Contents

Syntax

   [edgemap, mag] = ANISOEDGE_BASE(I, sigma, iter, max);

Acknowledgment

This function uses the freely available C function developped by Christine Kranenburg available at http://marathon.csee.usf.edu/edge/.

Remark

The original implementation only thresholded the top and left neighbours. Using 4 neighbors instead of 2 produces thicker but more continuous edges. The non-max then performs edge thinning.

See also

Ressembles: ANISOEDGE, EDGECORNER_BASE, CANNYEDGE_BASE, CANNYEDGEMAP_BASE, ROTHWELLEDGE_BASE, CONGRUENCYEDGE_BASE, COMPASSEDGE_BASE, SDGDEDGE_BASE, ELDERZUCKEREDGE_BASE, KOETHEDGE_BASE, PETROUEDGE_BASE. Requires: ANISOEDGE_MEX.

Function implementation

function [edgemap,varargout] = anisoedge_base(I, sigma, iter, max)

dealing with multispectral images

C = size(I,3);
if C>1
    edgemap = false(size(I));
    if nargout==2,  varargout{1} = zeros(size(I));  end;
    for c=1:C
        [edgemap(:,:,c), tmp] = anisoedge_base(I(:,:,c), sigma, iter, max);
        if nargout==2,  varargout{1}(:,:,c) = tmp;   end;
    end
    return;
end

call the mex file

[edgemap, mag] = anisoedge_mex(I, sigma, iter, max);
edgemap = ~edgemap;

if nargout==2,  varargout{1} = mag;  end;

end % end of anisoedge_base