getbeforeafterpts_fc.m

cootes提出的ASM算法的matlab实现。在cootes用于课堂使用的源代码的基础上改写。改正了原来代码中的一些错误

function [pt1,pt2]=GetBeforeAfterPts_fc(index,ContoursEndingPoints)

% 为了用c实现而重写

if index==1
   pt1=ContoursEndingPoints(1);
   pt2=2;
   return;
elseif index==ContoursEndingPoints(1)
   pt1=ContoursEndingPoints(1)-1;
   pt2=1;
   return;
elseif index==ContoursEndingPoints(end)
   pt1=ContoursEndingPoints(end)-1;
   pt2=ContoursEndingPoints(end-1)+1;
   return;
else
    for i=1:1:length(ContoursEndingPoints)
        if index==ContoursEndingPoints(i)
            pt1=index-1;
            pt2=ContoursEndingPoints(i-1)+1;
            return;
        elseif index-1==ContoursEndingPoints(i)
            pt1=ContoursEndingPoints(i+1);
            pt2=index+1;
            return;
        end
    end
    pt1=index-1;
    pt2=index+1;
end