问题描述不清，白点的区域不是矩形的，大小怎么定?
假设用最小的矩形包括：
index = find(I==0);
mostLeftPoint = index(1);
mostRightPoint = index(end);
[height,width]=size(I);
Y1 = mod(mostLeftPoint,height);
X1 = ceil(mostLeftPoint/height);
Y2 = mod(mostRightPoint,height);
X2 = ceil(mostRightPoint/height);
WhiteRegion = I(Y1:Y2,X1:X2);
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