Image Description:
(1) RGB image taken from smarphone camera
(2) Infrared image using Blue filter
(3) NDVI of (2) using infragram toolbox
(4) Infrared image using Red filter(5) NDVI of (4) using infragram toolbox
Why Red filter results shown in (4) and (5) are blurry compared to Blue filter results in (2) and (3)?
Sometimes different cameras use only one channel to focus, in order to work faster (less time combining channels before calculating). If they use the blue channel, the red filter will block the channel needed to perform focus calculations, and the focus may suffer.
Also, some lenses are just optimized for certain color ranges. But the blur you're seeing seems more than would be accounted for from that effect.
I hope that helps!
Hi warren,
Thank you for your response.
I have used PI camera as mentioned in the link below. https://store.publiclab.org/collections/diy-infrared-photography/products/infragram-pi-camera?variant=14249619095661
How to determine which channel is focused in my camera?
Thanks and regards, Dharam Shah
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