Hoi, >> attached you'll find distortion parameters for the GoPro Hero3+ >> Black Edition in 4:3 mode. > A big thank you also from me! > > One question, though: The distortion figures are rather small. > Maybe the designation as a "fisheye" lens is missing? Could you > make one of your calibration images available for me? Have a look at my calibration session here:
https://github.com/derlunz/gphero3-calibration Sorry, the repo is really big, I've accidentally included an unnecessary TIF. I am currently using the GoPro's in the context of stereo matching, and disparity map generation. From my work so far I can tell, that it is nuisance to use a _single_ set of distortion parameters for every GoPro of the same model. It seems that you get what you pay for, and it is not the high quality optics. Currently I am working on a calibration using the opencv fisheye model, and chessboard images. As far as I can tell, it is compatible to the POLY5 model, when you force the 6th, and 8th order terms of the opencv model to 0. Just for reference: opencv fisheye http://docs.opencv.org/2.4/modules/calib3d/doc/camera_calibration_and_3d_reconstruction.html#fisheye lensfun distortion models: http://lensfun.sourceforge.net/manual/group__Lens.html#gaa505e04666a189274ba66316697e308e Gui-wise hugin is *almost* the most advanced tool for stereo camera calibration, except that it is not meant for that application. The solver GUI is golden for optimizing only a subset of parameters. and examining the effects. It's a pity, that, to my knowledge, you can't select the distortion model within hugin. I've wrote a script, that detects checkerboards, and outputs the detected control points as pto, but right now I am occupied with the 'canonical' opencv-approach to stereo-calibration. I hope, that I'll find time to get back to this, since the other reasonable UI application I know of is bundled with MATLAB, and nobody should be forced to pay for that, just to get a stereo head rectified. Cheers, Christian ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. http://pubads.g.doubleclick.net/gampad/clk?id=1444514421&iu=/41014381 _______________________________________________ Lensfun-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lensfun-users
