void* detect_cpp(void  * ptr_data)
{
        LOGI("enter to detect");
        cv::Mat cvmat;
        cv::Mat cvMatConverted;
        cvmat = cv::Mat(720, 1280,  CV_8UC3, ptr_data);
        LOGI("cvmat: cols %d, rows %d, ptr %u\n", cvmat.cols, cvmat.rows,cvmat.data);
        LOGI("before converted");
        //cvMatConverted = cv::Mat(720,1280, CV_8UC3, ptr_data);
        LOGI("before cvtcolor");
        cv::cvtColor(cvmat,cvMatConverted,CV_YUV2BGR_NV12);
        LOGI("after cvtcolor");
        //IplImage* imgScribble = cvCreateImage(cvSize(1280, 720), 8, 3);
        //cvZero(imgScribble);
        cv::imwrite("/sdcard/emma-frame.jpg",cvMatConverted);
        return NULL ;
}