计算过程原理及代码；

matlab代码：先行(列)累加再列(行)累加；

function outimg = integralImg (inimg)
    % cumulative sum for each pixel of all rows and columns to the left and
    % above the corresponding pixel
    outimg = cumsum(cumsum(double(inimg),2));
end

参考

1.​​快速计算积分图​​；

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