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Comparing two pointclouds
Posted: Wed May 28, 2014 4:31 pm
by Ingsayyad
Can someone suggest me about statiscal parameters after comparing two point cloud. I got distance between two point cloud and hist showing distribution of these distance. What else can I get from CC. I 'm asking it because CC can provide much more( I believe) but I don't know how can I get benefit of CC.
Re: Comparing two pointclouds
Posted: Thu May 29, 2014 7:21 am
by daniel
Well first you can fit a statistical distribution on your histogram (to get its parameters - if they have any meaning for you).
Otherwise you can segment the cloud based on the distances (to extract the parts corresponding to true differences, etc.). To do this you can either use a simple threshold, or use the more advanced "Local Statistical Test" or the qM3C2 plugin that let's you do this in one shot by computing a confidence value along with each distance (so as to know if the distance corresponds to a real difference, or is only due to noise).
You can also display the color ramp and spawn labels on certain areas of your cloud to make a report for instance.
Eventually you can export the cloud in ASCII format and import the result in Excel or Matlab for further processing.