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https://github.com/ThemL0ver/opencv-python-tutorial/blob/master/docs/basic/15-histograms.md#numpy-中直方图计算
ravel()https://docs.scipy.org/doc/numpy/reference/generated/numpy.ravel.html
番外篇：代码性能优化https://github.com/ThemL0ver/opencv-python-tutorial/blob/master/docs/start/extra-01-code-optimization
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维基百科：直方图均衡化https://zh.wikipedia.org/wiki/%E7%9B%B4%E6%96%B9%E5%9B%BE%E5%9D%87%E8%A1%A1%E5%8C%96
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本节源码https://github.com/codecwang/OpenCV-Python-Tutorial/tree/master/15-Histograms
Histograms - 1 : Find, Plot, Analyze !!!https://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_imgproc/py_histograms/py_histogram_begins/py_histogram_begins.html#histograms-getting-started
Histograms - 2: Histogram Equalizationhttp://opencv-python-tutroals.readthedocs.io/en/latest/py_tutorials/py_imgproc/py_histograms/py_histogram_equalization/py_histogram_equalization.html#histogram-equalization
维基百科：直方图均衡化https://zh.wikipedia.org/wiki/%E7%9B%B4%E6%96%B9%E5%9B%BE%E5%9D%87%E8%A1%A1%E5%8C%96
维基百科：自适应直方图均衡化https://en.wikipedia.org/wiki/Adaptive_histogram_equalization
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