输出中间边框

   

通过边框位置在原图显示，用rectangle函数，

颜色还可以表示置信度，越绿越可能是人脸。

cv::Mat img_ = cv::imread("E://7.jpg");    bounding_box_ = bounding_box;//for (int i = 0; i < bounding_box_.size();i++) {//rectangle(img_, bounding_box_[i], 3);//}    confidence_ = confidence;int green = confidence_[i] * 255;int red = (1 - confidence_[i]) * 255;for (int i = 0; i < bounding_box_.size(); i++) {rectangle(img_, bounding_box_[i], cv::Scalar(0, green, red), 3);}