| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 | |||
| agustin_castellano | "Hi Andresc4, i would like be in touch with you.i'm researching about the same like you. I live in Argentina. Please contact me my email agustin.cas..." | Read more » | over 9 years ago | |||
| fjcaceres | "Hi Pat Thanks for your suggestion on the Forum address I bought a Canon A1200 just like you, and two filters from Cris, one of them the Wratten25..." | Read more » | over 9 years ago | |||
| patcoyle | "I'm still around, but don't have special insight to the points you raise. Consider posting your observations and questions to the PL plots-infrared..." | Read more » | over 9 years ago | |||
| fjcaceres | "Hi there The last post is over a year old so I don't know if there is anyone around to comment I am new to the IR NDVI scene and along many of the..." | Read more » | over 9 years ago | |||
| cfastie | "Stretching the histograms of either the NIR or VIS (or both) channels used to make NDVI is a trick that can produce more meaningful NDVI. I don't k..." | Read more » | over 9 years ago | |||
| kykytos | "@cfastie What do you mean with 'stretching the histogram of the infrablue photo'? Because if it means to reduce blue levels (increase NDVI levels),..." | Read more » | over 9 years ago | |||
| cfastie | "A standard coefficient is a tough nut. The amount you would want to shift the NDVI values will differ a lot among photos. Exposure and color balanc..." | Read more » | over 9 years ago | |||
| warren | "It looks to me like both offer pretty good differentiation, but that the red filtered version depresses NDVI values. But since we're not assuming a..." | Read more » | over 9 years ago | |||
| warren | "You're right - we need to display the colormap in the saved images too -- but we haven't had any time to do further development on Infragram.org, s..." | Read more » | over 9 years ago | |||
| warren | "The colormap is based on one of yours: " | Read more » | over 9 years ago | |||
| cfastie | "Yes, I can't say much without seeing the originals. Someone familiar with what infragram.org does might be able to infer something. When I follow ..." | Read more » | over 9 years ago | |||
| warren | "Do you think there's nothing you can infer without the originals? I'm guessing you want to look at the blue/red gap? These are the camera serial n..." | Read more » | over 9 years ago | |||
| warren | "I think they're gone, honestly. The bug seems to affect images captured via the webcam direct connection, but not images which were uploaded. I don..." | Read more » | over 9 years ago | |||
| cfastie | "Can you attach the original photos from the camera? Or do they exist only locked in the burly depths of Infragram for eternity? " | Read more » | over 9 years ago | |||
| warren | "These are all NDVI except the third, normal looking one which I labelled "original". Unfortunately a bug in infragram is not allowing display of th..." | Read more » | over 9 years ago | |||
| cfastie | "I'm confused about which images are photos from the camera and which are NDVI images. It would also help to know what the colors mean in NDVI images. " | Read more » | over 9 years ago | |||
| Tbtouaki | "Hi I have tried several white balance options before, base on what I've read. On this pics the settings were exactly the same as the maxmax camera...." | Read more » | over 9 years ago | |||
| Tbtouaki | "Hi Sorry for the trouble but how did you proceed to calibrate individual bands to reflectance before calculating NDVI? Did you use "dark object sub..." | Read more » | over 9 years ago | |||
| cfastie | "Hi Rita, Your photo above (NIR1_Red3_b.jpg) will not produce very good NDVI. Most of the pixels of plants have the same value in each of the three ..." | Read more » | over 9 years ago | |||
| Tbtouaki | "Hi I currently have a modified canon (IR block removed) with a wratten 25A Red filter. My pictures are really nice looking but I have big problems ..." | Read more » | over 9 years ago | |||
| bwarzak | "Ned, Our company is supposed to be writing an article for Vision System Design magazine regarding uses for dual band filters. I realize that the r..." | Read more » | over 9 years ago | |||
| Thorsten | "I had no problems with using lens filters so far. But it would be interesting if there is some reason to better replace the IR Filter instead. " | Read more » | almost 10 years ago | |||
| nedhorning | "I don't have experience with lens mounted filters but you might get some feedback if you post your question on the plots-infrared list at http://pu..." | Read more » | almost 10 years ago |