使用.get()方法:
std::tr1::shared_ptr<cv::Mat> pic_resize(new cv::Mat);
*(pic_resize.get()) = (*dep_vs_pkt->image_)(cv::Rect(0, 0, dep_vs_pkt->image_->cols / 2 * 2, dep_vs_pkt->image_->rows / 2 * 2)).clone();