IMG_0511-split.pngBrian Matherly, one of the developers of the MLT video processing framework started working on an NDVI postprocessing plugin which will make it very easy to create NDVI composite videos from infrablue or other IR/VIS footage.

There already is a working proof of concept at Github.

What is needed now is test footage. If you own a camera which is modified for recording IR footage, e.g. with an Infrablue or similar filter (e.g. the modified Mobius from Publiclab.org) , please post links to that footage in the comments! The more different footage the developers get, the easier the developing of the plugin will be.

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  • MR60

    Hi again Stefan, According to the agrobotix experience, the best index calculation is NIR-VIS. Indeed the classical formula was developed for the processing of satellite imagery which has not the same characteristics than drone pictures. See the last agrobotix post about this on this forum.

    Cheers

  • Great news. I look forward to following progress. This is the low-hanging fruit for agriculture applications - biggest bang for the buck. 

  • Yes, you can do it with one camera. To create composite videos you need a filter like a Rosco 2007 which lets visible light pass in the blue channel and NIR in the red channel.

    See:

    Infragram: online infrared image analysis
    Public Lab's online, open source service for generating plant health analyses from near-infrared imagery.
  • My understanding based on the formula, is you need 2 (identical) cameras in order to obtain the ~true~ NDVI.

    One camera on visible spectrum and one in Near Infra Red. Some people said they can do with only one camera, but in this care the formula is not followed. 

  • Nice! NDVI index is new to me. Very interesting!

  • The cool thing here is that if you have a fairly well performing computer, the conversion can be done in near real time...

  • @Hugues:

    I only posted the feature suggestion to the MLT mailing list :). You can see on Github that Brian uses

    float ndvi = (nir -vis) / (nir + vis);
  • MR60

    Hi Stefan,

    What formula do you use to calculate the NVDI index:

    IR-VIS/IR+VIS or IR-VIS ? 

  • I used the public lab filter here

  • Here is some on my blog post you can use

    http://diydrones.com/profiles/blogs/nir-images-in-the-makgadikgadi

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