Hi Michael I'm re-posting your question to the mailing list. Hopefully Chris or someone else familiar with the OpenCV functionality will be able to answer. Kind regards Stéfan ---------- Forwarded message ---------- Hi Stefan, I made it work eventually. But found a problem: cvSmooth does not work for BILATERAL filtering. If param3 and param4 are 0, just a black image is returned (even so param3 and 4 are not required for BILATERAL, and if they are set to values !=0, the source image is being returned. :( Does it work for you? On top of that I am not even able to submit a bug to OpenCV, because the ros account I had to create as mentioned here: https://code.ros.org/trac/opencv does not let me log into Trac, so I can't open a new bug. Weird... Best regards, Michael _____________________________ Universität Bern Physikalisches Institut Space and Planetary Sciences K.-Michael Aye, PhD BELA Assistant Project Manager