Fast Parsing of Line Segments in a BW Mask 1.0

LINEINMASK determines portions of the line in and out of a mask [inX inY] = LINEINMASK(XS,YS,BW,XV,YV) computes a the segments of the line specified by verticies XV and YV that are inside the mask BW. Points XS and YS specify the limits (or pixel values) of the coordinates of the matrix BW. [inX inY] = LINEINMASK(BW,XV,YV) assumes XS=1:N and YS=1:M where [M,N]=SIZE(BW). [inX inY] = LINEINMASK(...,METHOD) Uses the given method to create the polygon from the mask. Inner | Outer | {Exact} [inX inY outX outY] = LINEINMASK(...) outputs the segments of the line both in and out of the mask. Example: I = imread('rice.png'); level = graythresh(I); bw = im2bw(I,level); bw = bwareaopen(bw, 50); [a b] = size(bw); xv = b*rand(10,1); yv = a*rand(10,1); [inX inY outX outY] = lineinmask(bw,xv,yv,'exact'); figure imagesc(bw) colormap(bone) hold on; h1 = plot(inX,inY,'r'); h2 = plot(outX,outY,'b'); legend([h1 h2],'Inside Mask','Outside Mask');By J Sullivan, August 2011

Requirements:	No special requirements
Platforms:	Matlab
Keyword:	Brand,  Bwareaopenbw,  Bwilevel,  Exact,  Graythreshi,  Imread Ricepng,  Level,  Outer,  Sizebw
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