| 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 10 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 » | about 10 years ago | |||
| jdburnett | "Ned, I am getting access to a spectrometer soon. I'll be in touch once I do. " | Read more » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 years ago | |||
| funkycbj | "A blue filter will give better results if red or yellow flowers are present because the flower reflectance mixes with the leaf reflectance and defl..." | Read more » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 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 » | about 10 years ago | |||
| warren | "Oh, https://twitter.com/SpectralWB " | Read more » | about 10 years ago | |||
| warren | "Hi, Pascal - i wanted to know if it's OK for me to use your lead image as the SpectralWB twitter feed profile background? If you have a version wit..." | Read more » | about 10 years ago | |||
| donblair | "Follow-up -- there's some nice info on IR photodiodes (at least the sort that are in a typical IR remote), here -- including a link to a datasheet...." | Read more » | about 10 years ago | |||
| donblair | "Yay! Yeah, I puzzled a bit over the best geometry of 'emitters and receivers' to use on the device. I have two photodiodes on the board, one of w..." | Read more » | about 10 years ago | |||
| mathew | "The circular layout will make concentrating the different LEDs towards a common point easier. good thinking. " | Read more » | about 10 years ago | |||
| warren | "Exciting! " | Read more » | about 10 years ago | |||
| sekjal | "Can't wait to get my hands on the updated version and build some sweet Lego cases/containers/contraptions! " | Read more » | about 10 years ago | |||
| donblair | "And here's a nice way of doing color mixing using a ping pong ball as a diffuser: https://teachers.web.cern.ch/teachers/archiv/hst2005/part_sessio..." | Read more » | about 10 years ago |