Replies to This Discussion

Permalink Reply by Jerry Cresp on July 16, 2012 at 11:27pm

See attached for what I hve done; one camer is RGB and one is NIR.

Attachments:

• SkyWalker03 email.JPG, 148 KB

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Permalink Reply by Cala on July 17, 2012 at 3:58pm

Tanks Jerry, good idea, What NIR camera do you have?

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Permalink Reply by Jerry Cresp on July 17, 2012 at 8:47pm

I bought 2 Lumix DMC-TS3 s.

http://www.techrific.com.au/panasonic-lumix-dmcts3-dmcft3-digital-c...

I paid an additional $600 to have them both triggered electronically (at the same time) and one modified for NIR and 'matched' to the other camera.

Attached you can see a simple test sample result (low resolution) generated by the free MultiSpec software.

Attachments:

• NDVI.pdf, 1.1 MB
• VIS email.JPG, 1.2 MB

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Permalink Reply by Dean Walker on July 18, 2012 at 11:01am

Where did you

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Permalink Reply by Eric Schall on July 18, 2012 at 7:06pm

What kind of modifications did you do for the NIR camera? Was it simply a removal of the IR cut filter, or was the Bayer filter removed too? If the Bayer filter is still attached, which pixels do you use for NIR?

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Permalink Reply by Cala on August 5, 2012 at 6:51pm

This lumix have timelapse?

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Permalink Reply by Jerry Cresp on August 5, 2012 at 10:10pm

No, unfortunately.

This was one of the modifications that I paid for. The camera mechanic took out the battery and put in some electronics that enabeled me to trigger the camera externally by touching two wires together. This is done with a standard servo and controlled by the trigger command in the autopilot.  A bit primative but effective.

Jerry

P.S. I wish I spoke and wrote spanish.

 

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Permalink Reply by Eric Schall on July 17, 2012 at 8:04pm

Ive been thinking about the same issue as well. Id like to capture images in VNIR in order to calculate NDVI and other metrics. Most of the available cameras are visible spectrum only and have a Bayer filter (2 green: 1 red: 1 blue) and an IR cutfilter to block infrared. The websites Ive seen about IR photography are more artistically oriented and the photographer removes the IR cut filter but not the Bayer filter. In order to get useful data from this camera, youd have to chose one of the three values or average them. The best approach to capturing VNIR images would probably be to use a splitting prism and 4 CCDs, but that is probably too expensive. The page [ dpfwiw.com/ir.htm ] has some useful information about various filters for IR photography.

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Permalink Reply by Cala on July 18, 2012 at 6:19am

Thanks Jerry, beautifull Photos

I was investigating the ir cameras too, saw the Tetracam but is expensive and low resolution, but I find something interesting that if you remove the IR filter and block the blue light, you can use the blue band as IR band and is possible to obtain NDVI with only one cheap camera, i have a doubt whit the exposure speed you can obtain with this metod.

 

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Permalink Reply by Francisco on October 8, 2012 at 12:42pm

Cala, yo he estado analizando este tema también y tengo una pregunta. Una vez eliminado el filtro, los tres canales RGB captan el infrarrojo, pero el verde y rojo además el espectro visible. Dejando el canal del azul al margen al usar el filtro, ¿cómo un pixel sabe si la energía que capta proviene de la banda infrarroja o del visible? ¿hay un algoritmo que compara los tres valores de pixeles cercanos y calcula en que lugar del espectro está la radiación recibida?, como sabrás un pixel solo capta o verde o azul o rojo, no simultáneos puesto que la cámara realiza una interrepolación posterior. Filtro Bayer, 

Me interesa mucho este paso para tener una cámara IR-R-G a partir de una comercial 

Gracias

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Permalink Reply by Jorge Alarcon on July 18, 2012 at 8:48am

Your project so far looks fine.  Keep us updated on this project.

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Permalink Reply by Cala on July 18, 2012 at 8:53am

Thanks, Where are you from?

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