Circular Color Cubic Higher-order Local Auto-Correlation (C3-HLAC) is an efficient descriptor extracted from color voxel data, as presented in A. Kanezaki, T. Suzuki, T. Harada & Y. Kuniyoshi. Fast Object Detection for Robots in a Cluttered Indoor Environment Using Integral 3D Feature Table, Proceedings of the 2011 IEEE International Conference on Robotics and Automation (ICRA2011), 2011. It is obtained as a 981-dimensional histogram, where each bin is differentiated by the RGB color space and the relative position of the two neighboring voxels.
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$ rosrun c3_hlac example_c3_hlac `rospack find c3_hlac`/data/sample.pcd
This executable reads color point cloud "sample.pcd" and writes its C3-HLAC descriptor into "c3_hlac.pcd" in the current directory.
If you have pcl_visualization, you can see the histogram by:
$ rosrun pcl_visualization pcd_viewer c3hlac.pcd