c – 如何将pcl :: Histogram保存为PNG或JPG文件？

这是我需要在点[0]保存的直方图的变量.

pcl::PointCloud<Histogram<100> > hist;

我认为可以通过使用来完成

pcl::io::savePNGFile(path,*hist);

但这是我得到的错误

warning: ‘void pcl::io::savePNGFile(const string&,const pcl::PointCloud<PointT>&) [with T = pcl::Histogram<50>,std::string = std::basic_string<char>]’ is deprecated (declared at /usr/local/include/pcl-1.7/pcl/io/png_io.h:123): pcl::io::savePNGFile<typename T> (file_name,cloud) is deprecated,please use a new generic function pcl::io::savePNGFile (file_name,cloud,field_name) with "rgb" as the field name. [-Wdeprecated-declarations]

/usr/local/include/pcl-1.7/pcl/io/png_io.h:129:9: error: ‘const struct pcl::Histogram<50>’ has no member named ‘r’

/usr/local/include/pcl-1.7/pcl/io/png_io.h:130:9: error: ‘const struct pcl::Histogram<50>’ has no member named ‘g’

/usr/local/include/pcl-1.7/pcl/io/png_io.h:131:9: error: ‘const struct pcl::Histogram<50>’ has no member named ‘b’

所以我不能这样做,因为它没有任何rgb字段,但我真的需要保存大量的直方图,我无法一直截屏.