# nir nir

Author Comment Last activity Moderation
eustatic "Could i replicate this easily if i had purchased a photographers' white balance cards? would it look the same? I'm using the infragram.1.0 2-came..." | Read more » almost 9 years ago
ttaylor "Many thanks to Ned and the other conversion pioneers. On my second try I followed these instructions and successfully converted an A2200. On my fi..." | Read more » almost 9 years ago
jdburnett "Roolark, Would you be willing to post a link to your thesis or some more details regarding how you manipulated RAW data? I am interested to know i..." | Read more » almost 9 years ago
jdburnett "Ned, I am getting access to a spectrometer soon. I'll be in touch once I do. " | Read more » almost 9 years ago
cfastie " ...the NIR reflectance of the target affects how much the red/green/blue bayer mosaic filter allows through to the sensor. Roolark, I would thin..." | Read more » almost 9 years ago
nedhorning "Hi Roolark - Thanks for posting your comments and sharing your research. I don't know if you can post a link to your thesis but I'd be interested ..." | Read more » almost 9 years ago
cfastie "I guess it depends which camera and spectrometer you want to connect. A good approach might be to make a 3D printable Ebert. That could work with m..." | Read more » almost 9 years ago
warren "Wow cool Chris. I wonder if we could design a 3d printed adaptor between the camera and a spectrometer. " | Read more » almost 9 years ago
cfastie "Thanks for the link. For my ghost hunting, I have been buying PowerShot A590s for $20-$40, plus a $5 filter tube that snaps on, plus an$8 IR filte..." | Read more » almost 9 years ago
PlanetenPaultje "Took me a while to find the URL again: http://www.angelsghosts.com/store/viewitem.php?productid=16 I think the price has gone up a bit, I paid jus..." | Read more » almost 9 years ago
cfastie "Do you have a link for those IR filters? " | Read more » almost 9 years ago
PlanetenPaultje "Forgot to mention: There are IR pass filters to be had specifically for this type of camera. They come with glue buds and they fit perfectly on the..." | Read more » almost 9 years ago
warren "I just followed these instructions and converted an A2200 -- thanks! " | Read more » almost 9 years ago
Roolark "Ned, I'm not sure how much this information would help you out here, but I just finished my research thesis, which looked at the NIR sensitivity of..." | Read more » almost 9 years ago
nedhorning "I guess it's not actually an extra step. When I do the regression I'm comparing the JPEG pixel values that I adjusted with my inverse gamma (un)cor..." | Read more » almost 9 years ago
cfastie "What is the additional step to get a reflectance value? You are estimating the brightness of the reflected light arriving at the camera by using a ..." | Read more » almost 9 years ago
nedhorning "Chris, What you describe is part of what I'm trying to do. I want to take your description one step further so that the “new value” represents a p..." | Read more » almost 9 years ago
cfastie "How close is this to what you are trying to do? NDVI depends on the difference between two values: the amount of near infrared light (in a parti..." | Read more » almost 9 years ago
nedhorning "Hi jdburnett – It sounds like you have quite a nice collection of cameras. It would be great to run some calibration tests with different cameras a..." | Read more » almost 9 years ago
cfastie "Ned, From Mary’s scans, you knew the reflectance of your colored targets for every visible and near infrared wavelength. But it looks like you used..." | Read more » almost 9 years ago
jdburnett "Ned, thank you for your tremendous effort in this field. I have been following your work here and reviewing Geert Verhoeven's previous research ve..." | Read more » almost 9 years ago
nedhorning "Chris - Here are some comments to your first round of questions: How does this apply to dual camera systems, or does it apply only to single camer..." | Read more » almost 9 years ago
cfastie "Ned, This approach looks really promising. I was writing a comment about how this fit in with our current way of making NDVI when I realized I did..." | Read more » almost 9 years ago
marktheardvark "Actually, it seems to be possible to remove the filter coating (which should only be a few microns thick) on the new versions. After removing the ..." | Read more » almost 9 years ago