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static IBWIntegralImage stripedBWIntegralImage(ThreadPoolExecutor executor default null, int stripes, BufferedImage img) {
if (executor != null) stripes = min(stripes, executor.getMaximumPoolSize());
int _stripes = stripes;
int minPixelsToSplit = 16384;
int w = img.getWidth(), h = img.getHeight();
if (stripes <= 1 || w*h <= minPixelsToSplit)
ret BWIntegralImage(img);
else
ret BWIntegralImage_twoParts(executor, img, (img2, idx) ->
stripedBWIntegralImage(executor, (_stripes+idx) >> 1, img2));
}