centroid.m

用Cross validation的方法建立人工神经网络的模型！

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% function [posi]=centroid(region): find the central point for a given
% region
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% Input: part -- N*2 matrix, contain all points in this region
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% Output: center -- position vector of a point in 2D image
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function center = centroid(part)

center = mean(part);