| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Hi sujayj - I uploaded files with the target descriptions and reflectance information to my Google Drive: https://drive.google.com/drive/folders/0B..." | Read more » | about 7 years ago | |||
| sujayj | "@nedhorning I have been looking to carry out calibration but was halted by the expensive costs of targets. After reading through your article, I re..." | Read more » | about 7 years ago | |||
| nedhorning | "Hi jenjimah, Testing any of these and reporting back would be worthwhile from my perspective. One word of caution is that these are very bright re..." | Read more » | about 7 years ago | |||
| jenjimah | "Hello Ned, thank you for all your work on this subject. Currently I am looking for low-cost materials that can be used as reliable standards for N..." | Read more » | about 7 years ago | |||
| rs806 | "Okay thanks Ned! I had been wondering about the structure of the csv file since, judging from the script, it had quite a few columns of information..." | Read more » | over 7 years ago | |||
| nedhorning | "The CSV file for the R script is different form the table in the "Improved DIY NIR camera calibration" post. The CSV file has the reflectance value..." | Read more » | over 7 years ago | |||
| rs806 | "@nedhorning Hello Ned thank you for posting the R script. I'm finding it helpful to understand the process by going through the script itself. I wa..." | Read more » | over 7 years ago | |||
| nedhorning | "Hi Jeff - This should be the image. Let me know if this is ok or if I need to post it some other way Ned " | Read more » | over 7 years ago | |||
| warren | "Hi, Ned - do you think you could post the original images from which you generated your NDVI? Thanks! " | Read more » | over 7 years ago | |||
| nedhorning | "Hi kaushalsingh – The three target reflectance values you note seem like a good choice to me. At this point I do not have study material in additi..." | Read more » | over 7 years ago | |||
| kaushalsingh | "@nedhorning You got it right Ned. I am trying to calibrate the image using a reference target before you calculate NDVI. Suppose, I have 3 target ..." | Read more » | over 7 years ago | |||
| nedhorning | "Hi kaushalsingh – Ait seems as if you are trying to calibrate the image using a reference target before you calculate NDVI? If that assumption is a..." | Read more » | over 7 years ago | |||
| kaushalsingh | "@nedhorning Hello Ned, I have calculated ndvi using following code in matlab, using single camera without white balancing: red_orig = imread('IM..." | Read more » | over 7 years ago | |||
| nedhorning | "Hi - Using 440nm seem reasonable but I'd probably increase the NIR value to 760nm or beyond or something like that since the peak is probably beyon..." | Read more » | almost 8 years ago | |||
| carolccarvalho | "Hello, @nedhorning, for the Rosco Roscolux #2007 Storaro Blue Gel Filter, with the following datasheet Could I just use the visible reflectance ..." | Read more » | almost 8 years ago | |||
| Davidkao | "Thank you very much for the advice Chris and Ned, I have learned a lot. I will continue to this research, so if possible if I encounter any problem..." | Read more » | almost 8 years ago | |||
| cfastie | "David, When using a blue (#2007) filter, the red channel records NIR and the blue channel records visible blue light which is used to compute NDVI...." | Read more » | almost 8 years ago | |||
| nedhorning | "Hi David - This is an interesting project. The reflection of the glass should affect the results as long as the reflection is not in the area of yo..." | Read more » | almost 8 years ago | |||
| Davidkao | "Hello, @nedhorning, I had recently been researching about NDVI and came across your amazing calibration plugin. It works great; however I have a fe..." | Read more » | almost 8 years ago | |||
| nedhorning | "The current version of the plugin only outputs index (NDVI and DVI) images. The plugin only calibrates two bands, a visible and a NIR band and two ..." | Read more » | over 8 years ago | |||
| JacobNederend | "Thanks for the feedback. I think I misunderstood the function of this plugin. I thought I could calibrate my jpeg R/G/NIR images to a black, a gre..." | Read more » | over 8 years ago | |||
| nedhorning | "Hi Jacob, To check for aperture you could try another EXIF reader. Maybe "max aperture" is the same as "aperture" but I have no idea. When working ..." | Read more » | over 8 years ago | |||
| JacobNederend | "Hi Ned, I am really excited about the work you are doing here as it helps resolve some major issues with my grad studies. I have a few questions: ..." | Read more » | over 8 years ago | |||
| nedhorning | "I haven't seen reflectance curves for the "standard" white balance cards that include the NIR region of the spectrum. My guess is they would differ..." | Read more » | over 8 years ago |