Comments

Author Comment Last activity Moderation
nedhorning "Hi Suman - Using Analyze => Measure should work. It's not uncommon to have high pixel values for bright targets. In fact if the exposure isn't s..." | Read more » over 5 years ago
nedhorning "Hi Suman - The values from 0 - 1 have been scaled from the original image. The reason I do this is that some image pixel values range from 0 - 255 ..." | Read more » over 5 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 » over 6 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 » over 6 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 » about 7 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 » about 7 years ago
nedhorning "Chris - The relationships are curvilinear but my preference is to try and figure out how to "correct" the JPEG pixel values to create a linear rel..." | Read more » about 7 years ago
nedhorning "Hi Cindy - I'll start with the easy question first. The user guide can be downloaded from the plugin's GitHub repository: https://github.com/nedhor..." | Read more » about 7 years ago
nedhorning "Unfortunately those values would only work if you had the same materials that I used. To get the reflectance values you would either need to fine s..." | Read more » over 7 years ago
nedhorning "Hi aldehyde - Did you look at the user guide on Github: https://github.com/nedhorning/PhotoMonitoringPlugin that should have information about crea..." | Read more » over 7 years ago
nedhorning "Mathew - Have you been able to find a reflectance plot for those paints? I looked but didn't see it. Other paints I was looking at a couple years a..." | Read more » over 7 years ago
nedhorning "This error will occur if you run the Create NDVI from Image plugin without having an image displayed in ImageJ. I added an error message to the nex..." | Read more » over 7 years ago
nedhorning "The panel order is not important as long as it's predictable and known. The "ideal" targets would probably be a few gray patches from bright to dar..." | Read more » over 7 years ago
nedhorning "At this point I haven't put much thought into ideal targets mostly because I don't have access to a spectrometer to measure and test different targ..." | Read more » over 7 years ago
nedhorning "When I first started thinking about this a couple years ago I figured auto-detecting the calibration targets would be key but that turned out to be..." | Read more » over 7 years ago
nedhorning "Yep - that's it " | Read more » over 7 years ago
nedhorning "Chris - I'll email you the master list with all of the reflectance values for each target since they aren't really useful without the images. You n..." | Read more » over 7 years ago
nedhorning "At this time it is not possible to use geo-reference data. If there is sufficient interest in that functionality I could try to add it but it's not..." | Read more » over 8 years ago
nedhorning "Hi Alan, That sounds good. The first thing your son will realize is that I'm not a very talented programmer. I'm traveling until early next week b..." | Read more » over 8 years ago
nedhorning "Hi - At this point the plugin does not subtract the NIR from the red. I've been doing this subtraction as part of my calibration tests: http://publ..." | Read more » over 8 years ago
nedhorning "When I created the images above I scaled the output so and NDVI or DVI values less than 0 were set to 0. To include the full range of possible valu..." | Read more » over 8 years ago
nedhorning "Actually the macro always worked with jpeg images. In ImageJ/Fiji. It has always been able to read any image format recognized by ImageJ/Fiji. Sorr..." | Read more » over 10 years ago
nedhorning "I created a GitHub repo for the IamgeJ/FIJI macro. I think you can access it by going to: https://github.com/nedhorning/RegisterPhotos.git If that..." | Read more » over 10 years ago