| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Hi Agustin - I have a feeling the problem with with the calibration targets you are using. The targets I sued for this note were scanned by a labor..." | Read more » | about 9 years ago | |||
| agustin_castellano | "Hi Ned me again, could be that the analisys that you did it was over the image without the red filter? because when i read the article i understand..." | Read more » | about 9 years ago | |||
| agustin_castellano | "Hi ned! I would like to ask you how do you setup the camera? I have a canon power shot a490 with red filter, i try to a similar test but with bud r..." | Read more » | about 9 years ago | |||
| warren | "Each ```` has to be on its own line, then it should work. Thanks, Ned! " | Read more » | about 9 years ago | |||
| nedhorning | "I posted it on GitHub GIST: https://gist.github.com/nedhorning/f384d9afcc043741def3 " | Read more » | about 9 years ago | |||
| warren | "Hmm, I think I need a username too? To post formatted code, you can use four ` characters -- ```` on lines before and after your code, and it'll d..." | Read more » | about 9 years ago | |||
| nedhorning | "Hi - I actually thought I posted this a few days ago but for some reason I guess it didn't work. Now when I post it I see that the comments are int..." | Read more » | about 9 years ago | |||
| geraldmc | "Very helpful Ned, thanks! I'd also appreciate seeing your R script. " | Read more » | about 9 years ago | |||
| warren | "I'd love to see the R script. How do you recommend people select a value for redGamma or percentBlue? " | Read more » | about 9 years ago | |||
| nedhorning | "Hi Jeff - I'm not sure what math you are looking for. For the gamma correction I use: The first step is to remove the effect of the gamma correcti..." | Read more » | about 9 years ago | |||
| warren | "Hi Ned - this is great. If you post the math, I'll try to port it to Infragram as well. Great work! " | Read more » | about 9 years ago | |||
| peauproductions | "Hello Ned, can you please contact me: nolan@peauproductions.com. We have a new dual-band NDVI filter and would like to ask you some questions, tha..." | Read more » | about 9 years ago | |||
| nedhorning | "Hi manattta - Keep in mind that white balance and calibration are two different processes. White balance is used to adjust the in-camera processing..." | Read more » | over 9 years ago | |||
| manattta | "Hi ned. Thank you for posting your work. I was wondering, and I just want to check, for flying a small UAV with a single NIR camera, with the cali..." | Read more » | over 9 years ago | |||
| nedhorning | "Hi Scott, It might be possible to calibrate a camera using a single color like a white balance card but at the very least you would need to know th..." | Read more » | about 10 years ago | |||
| 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 » | about 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 | |||
| 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 |