CANNYEDGEFUSE_BASE - Base function for CANNYEDGEFUSE.

Contents

Syntax

   edge = CANNYEDGEFUSE_BASE(I, sig2, sig1, serad, der, hyst);

See also

Ressembles: CANNYEDGEFUSE. Requires: CANNYEDGE_BASE.

Function implementation

function edgemap = cannyedgefuse_base(I, sig2, sig1, serad, der, hyst, reduce)

setting variables

C = size(I,3);

% ensure to combine two distinct scales
if sig1==sig2,   sig2 = sig1 + 0.5;  end;

% in the case 'emax', the final max of the edge maps of the different
% channels is taken on the output of the combination of the two scales, not
% when computing the edge maps.
if ischar(reduce) && strcmpi(reduce,'eor')
    reducefirst = false;
else
    reducefirst = reduce;
end

compute edges at finest scale: sig1

edgemap = cannyedge_base(I, sig1, der, hyst, reducefirst);

compute edges at coarsest scale: sig2

edgemap2 = cannyedge_base(I, sig2, der, hyst, reducefirst);

dilate the edges detected at the coarsest scale

se = strel('disk',serad);
edgemap2 = imdilate(edgemap2,se);

compute the final edge map as the set of pixels detected as edges in both the finest edge map and the dilated coarsest edge map

edgemap = edgemap & edgemap2;

special output in multispectral case

if C>1 && ischar(reduce) && strcmpi(reduce,'eor')
    edgemap = max(edgemap, [], 3);
end

end % end of cannyedgefuse_base