| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| sujayj | "@cfastie This is a very informative article. However, It isn't clear what is to be done after obtaining the final graph as you've shown. Are we goi..." | Read more » | about 7 years ago | |||
| Claytonb | "@Thorsten I have not tried using a chart like the color checker though I have used materials(plastic, felt, paper) in the shade of red on the chart..." | Read more » | over 7 years ago | |||
| Thorsten | "@Claytonb great work as usual! Two questions: Have you tried some reddish colors of calibration targets such as the ColorChecker? http://xriteph..." | Read more » | over 7 years ago | |||
| cfastie | "The lamp post, the wall, and parts of the tree trunk are all very dark. It is a common artifact that NDVI computed for dark areas of photos is not ..." | Read more » | over 7 years ago | |||
| warren | "Or perhaps the lead image here, which uses the #19 Rosco "fire" filter currently in the Mobius Infragrams: https://publiclab.org/notes/mathew/04-30..." | Read more » | over 7 years ago | |||
| warren | "This is so great, Abdul!!! One note -- the lead image shows a blue-filtered image, whereas the Mobius uses a red-filtered sensor. So perhaps the l..." | Read more » | over 7 years ago | |||
| spandan1234 | "Hi cfastie, I need a little help here. Following your suggestions I did all the calibrations required and the results were great. But in the last f..." | Read more » | over 7 years ago | |||
| Ajith_Kumar | "Thank you cfastie for the detailed description. This answer is really helpful to me. " | Read more » | over 7 years ago | |||
| warren | "I added a question:...... tag -- :-) " | Read more » | over 7 years ago | |||
| jfrankamp | "Somehow this didn't become a "Question" type... if anyone knows how to convert it I'd be thankful :-) " | Read more » | over 7 years ago | |||
| cfastie | "This is a good question, and not an easy one to answer. Preferred characteristics of cameras to be converted to pure NIR or full spectrum (NIR + R..." | Read more » | over 7 years ago | |||
| warren | "Hi! There are a range of reviews and comments on different conversion-candidate cameras here: https://publiclab.org/wiki/infragram-convertible-came..." | Read more » | over 7 years ago | |||
| cfastie | "You can try other colors for doing a custom white balance. See this note: https://publiclab.org/notes/Claytonb/08-13-2016/plant-health-ndvi-white-b..." | Read more » | over 7 years ago | |||
| spandan1234 | "The NDVI map looks good. But is there anything that can be done to better the results. The information required is totally visible here. Any sugges..." | Read more » | over 7 years ago | |||
| cfastie | "Your photo looks good. An NDVI image made with the Photomonitoring plugin for Fiji also looks good. That might be a better way to process your phot..." | Read more » | over 7 years ago | |||
| spandan1234 | "Hi, I have taken some images directly from a Canon SX280 with a red filter. Then I calibrated it using the reflectance from red paper in the shade ..." | Read more » | over 7 years ago | |||
| cfastie | "This is a great discovery. It will be good to learn how this color works with a red filter like Wratten 25. I will keep my eye out for Boom Chicka ..." | Read more » | over 7 years ago | |||
| cfastie | "The camera used to make that orthophoto image was a Canon PowerShot A590 from 2008. These are available on ebay for about US$30.00. It is a very g..." | Read more » | over 7 years ago | |||
| thechapu | "Thank you very much for your reply. You use that camera? That software used to calculate NDVI and make histogra " | Read more » | over 7 years ago | |||
| cfastie | "This is a great illustration that all of the standard white balance settings are very similar. The custom white balance setting used to produce pho..." | Read more » | over 7 years ago | |||
| thechapu | "Hello, If I removed the fitro for IR camera lens yesterday was a very sunny day in Santiago de Chile, take the occasion and take photographs chang..." | Read more » | over 7 years ago | |||
| cfastie | "Did you remove the camera's IR block filter before you installed the red filter? If so, the blue channel in your photos should be a good NIR photo..." | Read more » | over 7 years ago | |||
| thechapu | " I reviewed my camera has 4 options for white balance, select the option 'sun' and these are the results " | Read more » | over 7 years ago | |||
| cfastie | "Yes sunlight is important. The light illuminating the plant should have about the same proportion of visible:NIR as sunlight or the results will be..." | Read more » | over 7 years ago |