On 06/17/2014 08:07 PM, Dan Dennedy wrote: > Are the IR and VIS videos coming from different unsynchronized > cameras? Do you also need functions to align the images spatially and > temporally?
I think, that's a possibility but as far as I can tell, most "grassroots" environmentalists use a single camera with some kind of filter which puts the IR in the red channel and the visible spectrum in the blue channel or similar. Typical is a Rosco 2007 filter. Here are the parameters for that filter: http://www.rosco.com/filters/SED.cfm?titleName=R2007:%20Storaro%20Blue&imageName=../images/filters/roscolux/2007.jpg But having the possibility to do that could potentially create more precise results because the greyscale VIS footage would contain R, G and B information as opposed to only B and a tiny bit of G when using a single camera. One other thing that people often do is simply remove the IR cut filter from a lens so they get a composite of R, G, B and lots of IR. That's fairly tricky to postprocess too. For GIMP I wrote a short tutorial on that here: http://stefan.gofferje.net/uav/170-ir-photos-with-the-boscam-hd19-part-1 But to my knowledge that’s rarely used for creating NDVI because the VIS red information kinda messes with the IR - the cameras don't save the information what is VIS red and what is IR. I have a sheet of Rosco 2007 and a few lenses on order and I recently made a short video about how to postprocess pure IR footage with KDEnLive (http://stefan.gofferje.net/uav/199-video-ir-video-postprocessing). In 2 or 3 weeks I should be able to produce some sample footage - With Rosco 2007 filter - IR composite (lens without IR cut) - Pure IR (lens with IR passthrough filter) -S -- (o_ Stefan Gofferje | SCLT, MCP, CCSA //\ Reg'd Linux User #247167 | VCP #2263 V_/_ Heckler & Koch - the original point and click interface
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