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采用edge法在MATLAB里面检测图像边缘
% B = BOUNDARIES(BW) traces the exterior boundaries of objects in
% the binary image BW. B is a P-by-1 cell array, where P is the
% number of objects in the image. Each cell contains a Q-by-2
% matrix, each row of which contains the row and column coordinates
% of a boundary pixel. Q is the number of boundary pixels for the
% corresponding object. Object boundaries are traced in the
% clockwise direction.