pcl point merge
http://pointclouds.org/documentation/tutorials/pairwise_incremental_registration.php#pairwise-incremental-registration
http://pointclouds.org/documentation/tutorials/concatenate_clouds.php
知识就是希望
http://pointclouds.org/documentation/tutorials/pairwise_incremental_registration.php#pairwise-incremental-registration
http://pointclouds.org/documentation/tutorials/concatenate_clouds.php