[pcl::PCDWriter::writeASCII] Input point cloud has no data

terminate called after throwing an instance of 'pcl::IOException'
  what():  : [pcl::PCDWriter::writeASCII] Input point cloud has no data!错误

是由于imread里读取或者写入图片或者时路径不对

假如原来为

 cv::imwrite( "./data/matches.png", imgMatches );

或者直接

 cv::imwrite( "/data/matches.png", imgMatches );

如果直接在bin文件里执行就会出错

应该改为

 cv::imwrite( "../data/matches.png", imgMatches );