算法通过分析帧间的SURF特征点匹配数目随时间变化的性质来检测镜头边界。

The algorithm detects the shot boundary by analyzing the nature that the matching number of SURF feature points of frames change over time.

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然后跟据局部特征匹配的数目多少来判断车辆的类型，即最多匹配数目的车辆为所识别的结果。

For recognition, the image in the database which has the largest number of matched features is used to measure the type of the car.

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下面是需要遵循的规则：从regex的开头开始计算左括号的数目——该计数是匹配数组的索引。

Here's the rule to follow: count the number of left parentheses from the beginning of the regex - the count is the index to the match array.

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