opencv矩形检测，采用金字塔方法，可以对多幅图同时检测。-opencv rectangle detection, using the pyramid method, can simultaneously detect pieces of map.

实现证件的分割，具有良好的参考价值，使用矩形检测，阀值变换和反色等-Achieve segmentation of documents, has a good reference value, use the rectangle detection, threshold, transformation and anti-color, etc.