[PublicLab] Question: NDVI with a 2 camera setup (#24740)

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Public Lab contributor karunv just asked a question entitled 'NDVI with a 2 camera setup':

Help them by posting an answer here: https://publiclab.org/questions/karunv/10-12-2020/ndvi-with-a-2-camera-setup

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Hello,

I was exploring detecting stress levels in plants in my backyard and put together a 2 camera system as follow.

Would like to get feedback on whether this setup is right to help me calculate NDVI and in-turn determine growth in my lemon plants

Camera 1: OV5647 IR-Cut camera (so I believe this has no IR filter)

Camera 2: another OV5647 IR-Cut camera with a Mid-opt IR 850nm filter attached externally

I have aligned the pictures of these 2 cameras.

Camera1 Picture:

Camera 2 Picture:

My questions were:

#1) Can my camera 1 be a NoIR/IR-cut camera or does it need to be a "regular" camera with an IR filter

#2) To calculate NDVI, I am currently using the "R" channels of both of these images. Is this correct or should I be using other channels

#3) More broadly, is detecting "stress" level in individual plants at a close range is my goal, is there a better setup / model towards achieving that.

Thank you

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