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calibrate-ndvi
calibrate-ndvi


Author Comment Last activity Moderation
Parth "Hi Chris, Thanks for your quick response. I am little confusing with the NIR light bandwidth because of NIR light's band width is 700 to 900 nm a..." | Read more » over 7 years ago
cfastie "Parth, Red filters like the Rosco #19 block most blue and green light, so the blue and green channels cannot receive the colors that they would no..." | Read more » over 7 years ago
Parth "Hi Chris, Thanks for your response. I read the data sheet of rosco fire filter #19 and i think this filter is block blue and green light upto 550..." | Read more » over 7 years ago
cfastie "Parth, Most photos taken by DIY NDVI cameras cannot be converted directly to NDVI because the ratio of the visible and NIR values does not compute..." | Read more » over 7 years ago
Parth "Hi Chris, Thank you very much for kind response. I converted various plant's images into NDVI index as per your suggestion for infragram standard..." | Read more » over 7 years ago
cfastie "Hi Parth, There are a lot of options at infragram.org, so it's not easy to find the most sensible way to process a photo. I made the NDVI image be..." | Read more » over 7 years ago
nedhorning "Ok - That site was taken off line last year I think - sorry. " | Read more » over 8 years ago
wheat12 "Ned- It was this link: ftp://ftp.amnh.org/pub/people/horning/CalibrationTestPhotos. " | Read more » over 8 years ago
nedhorning "Hi Dj - Can you let me know which link you refer to? I have a few scripts that mostly deal with image classification and regression at https://bitb..." | Read more » over 8 years ago
wheat12 "HI Ned, I find your notes quite informative. The photo monitoring plugin is a great tool you developed. You also mentioned in your note about the R..." | Read more » over 8 years ago
nedhorning "The value of camera calibration depends on what you're doing. If you're just looking for relative differences across an image calibration isn't all..." | Read more » over 8 years ago
Joseal "Thanks for your kind answer Ned: I will try to start the experiment of the spectroradiometer on the calibration targets during different times of ..." | Read more » over 8 years ago
nedhorning "Hi Giovanni - You should be able to use the photo monitoring plugin to process images from different cameras even if the cameras have different se..." | Read more » over 8 years ago
Giovanni1983 "Hi Ned, I'm newbie here so I hope my comment will be read. I also apologize in advance for all the language mistakes i'll do during this conversati..." | Read more » over 8 years ago
nedhorning "Hi - Using a field spectroradiometer for getting reflectance values of targets is a good idea. It would probably be best if you can take reflectanc..." | Read more » over 8 years ago
Joseal "Ned, I have two question: ┬┐What do you think about using a field spectroradiometer for reflectance values of targets? Do you think that is necessa..." | Read more » over 8 years ago
Joseal "Thank you very much Ned. This information will help me a lot to improve my procedures for agricultural monitoring using NDVI. " | Read more » over 8 years ago
natalie " " | Read more » about 9 years ago
natalie "What about a different filter? Or how do we white balance these? Next Steps suggestions. " | Read more » about 9 years ago
warren ":-/ doesn't look good. I think without white balancing it, we're going to have a hard time using this cam. http://infragram.org/i/53f266c40ab503..." | Read more » about 9 years ago
natalie " The plant is dying but it still have some green to it. How is this? " | Read more » about 9 years ago
warren "Mathew just had trouble uploading lots of photos too, so perhaps it chokes on large uploads. If you could just upload the one raw image with a red ..." | Read more » about 9 years ago
natalie "I guess. What a pain in the butt. I tried for about an hour to post them at the original size and the wiki just said updating, perpetually and neve..." | Read more » about 9 years ago
mathew "There's an application for linux-- GUVCView that should let you capture full resolution 1200x1600) in the settings. " | Read more » about 9 years ago