VS2013 Opencv2.4.11 contour detection code, this code to join the gray-levelhistogram equalization processing.
详细说明： VS2013 Opencv2.4.11下轮廓检测代码，此代码加入灰度直方图均衡化处理。
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Third, the gray-levelhistogram of image is equalized in order to reduce the influence of uneven light to the gray-level image.
第三步，为了减轻光线不均匀对灰度图像造成的影响，对产品图像进行灰度直方图均衡；
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One of the most useful thresholding techniques using gray-levelhistogram of an image is the OTSU method. The objective of this paper is to extend it to the 2-dimensional histogram.