| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| suman | "Dear Warren, I am currently looking some literatures on Image Vignetting Correction. I will definately post back after i come ..." | Read more » | almost 7 years ago | |||
| warren | "Ah, i've just learned that I didn't know the definition of vignetting. But I do now -- apologies for mixing this up! I haven't heard anything about..." | Read more » | almost 7 years ago | |||
| suman | "Dear Warren, I checked about the lens vignetting correction under the tag Lens-distortion as you mentioned. However, i didn't ..." | Read more » | almost 7 years ago | |||
| suman | "Thanks for your prompt response warren.....highly appreciable.... Cheers " | Read more » | almost 7 years ago | |||
| suman | "Thanks for your prompt response warren.....highly appreciable.... Cheers " | Read more » | almost 7 years ago | |||
| warren | "There are a few different approaches to this too, but one which definitely works is documented alongside an in-progress web-based approach, both un..." | Read more » | almost 7 years ago | |||
| suman | "Thanks for your response warren and Chris...I highly appreciate it..I was also interested to know about the vignetting effect and how public labs i..." | Read more » | almost 7 years ago | |||
| cfastie | "Do you think i need the targets of known spectral reflectivity in the same bands that will be used to compute NDVI or it can be tested with any mat..." | Read more » | almost 7 years ago | |||
| warren | "Hi -- well, there may be methods like that; just to put in another idea, although you probably won't want to do it; Dorn Cox from Farm Hack has act..." | Read more » | almost 7 years ago | |||
| suman | "Some initial results using your white balance settings are impressive, however in this particular picture the roof of the house is showing high pho..." | Read more » | almost 7 years ago | |||
| cfastie | "Finding inexpensive, do-it-yourself calibration targets is an obstacle to NDVI calibration. You need targets for which the spectral reflectance is ..." | Read more » | about 7 years ago | |||
| J_tanna | "@cfastie sample image is like this, " | Read more » | about 7 years ago | |||
| J_tanna | "@cfastie On an agriculture land, How can we specify the targets for calibration? " | Read more » | about 7 years ago | |||
| cfastie | "Here is my discussion of calibrating NDVI images: https://publiclab.org/notes/cfastie/05-01-2016/calibration-cogitation And Ned's most recent note..." | Read more » | about 7 years ago | |||
| J_tanna | "@cfastie Thank you for your time. I have two more doubts in my mind, 1.) What are the steps that I need to apply for image calibration? 2.) What is..." | Read more » | about 7 years ago | |||
| cfastie | "With a blue filter which blocks only red light, the red channel will capture NIR. Use the red channel for NIR and the blue channel for visible ligh..." | Read more » | about 7 years ago | |||
| cfastie | "With a blue filter which blocks only red light, the red channel will capture NIR. Use the red channel for NIR and the blue channel for visible ligh..." | Read more » | about 7 years ago | |||
| J_tanna | "@cfastie What should be the formula of NDVI for NIR camera as it is blocking red light. " | Read more » | about 7 years ago | |||
| cfastie | "Hi Kendrick90, You're right that single camera systems have their limitations. The Wratten 25A camera produces a very good NIR channel (blue) with ..." | Read more » | almost 10 years ago | |||
| kendrick90 | "I initially found this site while searching for automatic insect recognition because I'm interested in the potential for robots to help us by shoot..." | Read more » | almost 10 years ago | |||
| mathew | "Thanks Chris! " | Read more » | almost 10 years ago | |||
| cfastie | "That nice windows program for Mobius is not official, just written by the isoprop guy. I guess nobody has done it yet for the Mac. Here is the con..." | Read more » | almost 10 years ago | |||
| mathew | "I've been manually editing the config file-- the only thing I can't figure out is how to turn on the custom white balance. " | Read more » | almost 10 years ago | |||
| warren | "Shouldn't it be possible to copy the text config file from Chris's mobius and post it here so Mathew can use it? " | Read more » | almost 10 years ago |