Development of NDVI postprocessing plugin for frei0r / the MLT framework - video test footage needed!

Brian 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.

Views: 817

Comment by Christiaan van Vollenstee on June 19, 2014 at 3:50am
Comment by Christiaan van Vollenstee on June 19, 2014 at 3:51am

I used the public lab filter here


MR60
Comment by Hugues on June 19, 2014 at 4:51am

Hi Stefan,

What formula do you use to calculate the NVDI index:

IR-VIS/IR+VIS or IR-VIS ? 

Comment by Stefan Gofferje on June 19, 2014 at 6:22am

@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);
Comment by Stefan Gofferje on June 19, 2014 at 6:24am

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

Comment by Greg Dronsky on June 19, 2014 at 7:58am

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

Comment by criro1999 on June 19, 2014 at 8:10am

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. 

Comment by Stefan Gofferje on June 19, 2014 at 8:19am

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:

Comment by Ned Horning on June 19, 2014 at 10:09am

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


MR60
Comment by Hugues on June 19, 2014 at 10:43am

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

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