| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 » | over 9 years ago | |||
| DavidMack | "That's great work. The videos are very well done and have a lot of info explained in a nice, straight forward manor. I like the photo card. Add ..." | Read more » | over 9 years ago | |||
| warren | "Each ```` has to be on its own line, then it should work. Thanks, Ned! " | Read more » | over 9 years ago | |||
| nedhorning | "I posted it on GitHub GIST: https://gist.github.com/nedhorning/f384d9afcc043741def3 " | Read more » | over 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 » | over 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 » | over 9 years ago | |||
| geraldmc | "Very helpful Ned, thanks! I'd also appreciate seeing your R script. " | Read more » | over 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 » | over 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 » | over 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 » | over 9 years ago | |||
| nedhorning | "Chris - Thanks for pointing that out. I typically clip the values so anything greater than 1 becomes 1 and anything less than -1 become -1. " | Read more » | over 9 years ago | |||
| cfastie | "It looks like the computed index will no longer be between -1 and +1 if you adjust the red value that way. Do you then have to rescale the index so..." | Read more » | over 9 years ago | |||
| nedhorning | "Hi Agustin - Your second equation is one option. Another is: (blue- (red-blue0.8)) /(blue+(red-blue0.8)) You can play around with the factor I add..." | Read more » | over 9 years ago | |||
| agustin_castellano | "Sorry is should be (blue- (red-blue)) /(blue+(red-blue)) ?? To extract the nir data in the red chanel. Regards. " | Read more » | over 9 years ago | |||
| agustin_castellano | "Could something like this (blue- (red-blue)) /(blue-(red-blue)) ?? To extract the nir data in the red chanel. Regards. " | Read more » | over 9 years ago | |||
| nedhorning | "Hi Agustin, The formula you wrote is what I use. I typically use the PhotoMonitoring plugin which can be found here: https://github.com/nedhorning..." | Read more » | over 9 years ago | |||
| agustin_castellano | "Hi Ned thanks for your research! Is great this information. i have two doubts. First if i use a red filter how should be the formula (blue - red) ..." | Read more » | over 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 » | over 9 years ago | |||
| mathew | "ran some tests on the different Kitagawa tubes that have been used. I put the end into the drilled-out brass tube I've been using to break them, a..." | Read more » | over 9 years ago | |||
| mathew | "I bought and tried a 50ml pipette and made a dropout jar. The jar kind of works-- some condensation still seems to get through, but never bubble..." | Read more » | over 9 years ago | |||
| fjcaceres | "Chris On last thing on the Agribotix site is that they conclude the best filters are the blue ones Javier " | Read more » | over 9 years ago | |||
| DavidMack | "@mathew I believe you have the VWR series FR2000 rotameter, which the accuracy is specified as +/- 5% of full scale, so that's +/- 0.05 lpm. see h..." | Read more » | over 9 years ago | |||
| danbeavers | "@mathew What do you mean by " small control orifice into a brass rod and put it at the intake"? I hope you are thinking manometer . . . What I s..." | Read more » | over 9 years ago | |||
| nshapiro | "@mathew were the two tubes that you are comparing opened by different means? perhaps if we can just standardize the tip breaking better we wouldn't..." | Read more » | over 9 years ago |