| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| nedhorning | "Ok - That site was taken off line last year I think - sorry. " | Read more » | almost 9 years ago | |||
| nedhorning | "Hi Dj - Can you let me know which link you refer to? I have a few scripts that mostly deal with image classification and regression at https://bitb..." | Read more » | almost 9 years ago | |||
| nedhorning | "Hi Nanfeng, I'm not certain why the results look the way they do but I have a feeling that it could be a result of doing pixel-by-pixel comparison..." | Read more » | almost 9 years ago | |||
| nedhorning | "The value of camera calibration depends on what you're doing. If you're just looking for relative differences across an image calibration isn't all..." | Read more » | about 9 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 » | about 9 years ago | |||
| nedhorning | "Hi Giovanni - You should be able to use the photo monitoring plugin to process images from different cameras even if the cameras have different se..." | Read more » | about 9 years ago | |||
| nedhorning | "Hi manattta - Keep in mind that white balance and calibration are two different processes. White balance is used to adjust the in-camera processing..." | Read more » | about 9 years ago | |||
| nedhorning | "Hi - Using a field spectroradiometer for getting reflectance values of targets is a good idea. It would probably be best if you can take reflectanc..." | Read more » | over 9 years ago | |||
| nedhorning | "I often use platforms that are moving so I use a fast shutter speed to reduce blur. I often shoot somewhere around 1/1000th of a second. You should..." | Read more » | almost 10 years ago | |||
| nedhorning | "Chris - I want to test to see how well calibration transfers between cameras and also between different camera settings and incident light (clear v..." | Read more » | almost 10 years ago | |||
| nedhorning | "Hi Scott, It might be possible to calibrate a camera using a single color like a white balance card but at the very least you would need to know th..." | Read more » | almost 10 years ago | |||
| nedhorning | "Hi Roolark - Thanks for posting your comments and sharing your research. I don't know if you can post a link to your thesis but I'd be interested ..." | Read more » | almost 10 years ago | |||
| nedhorning | "I guess it's not actually an extra step. When I do the regression I'm comparing the JPEG pixel values that I adjusted with my inverse gamma (un)cor..." | Read more » | almost 10 years ago | |||
| nedhorning | "Chris, What you describe is part of what I'm trying to do. I want to take your description one step further so that the “new value” represents a p..." | Read more » | almost 10 years ago | |||
| nedhorning | "Hi jdburnett – It sounds like you have quite a nice collection of cameras. It would be great to run some calibration tests with different cameras a..." | Read more » | almost 10 years ago | |||
| nedhorning | "Chris - Here are some comments to your first round of questions: How does this apply to dual camera systems, or does it apply only to single camer..." | Read more » | almost 10 years ago | |||
| nedhorning | "Thanks for the suggestion. Maybe a teflon sheet is the way to go although I don't have any experience with these. Some of the thin sheets seem tran..." | Read more » | over 10 years ago | |||
| nedhorning | "I have been making some progress toward standardized calibration targets. Does anyone viewing this know of a source for inexpensive paints/coatings..." | Read more » | over 10 years ago | |||
| nedhorning | "Hi Thorsten, Glad to hear you're making progress. When you run the plugin are you specifying that the channel from the visible image to use for th..." | Read more » | over 10 years ago | |||
| nedhorning | "Is this your conclusion or do we have to test lots of other materials that commonly show up in the NDVI images we take? I have looked at a lot of..." | Read more » | over 10 years ago | |||
| nedhorning | "Chris, So many questions... I think more testing is necessary but I'll take a shot at answering each question. I'd like to hear what other folks th..." | Read more » | over 10 years ago | |||
| nedhorning | "If you use a dual-camera setup I suggest using an unmodified camera and a NIR-pass (visible cutoff) filter for the other camera. Some people use un..." | Read more » | over 10 years ago | |||
| nedhorning | "Hi Thorsten, Sorry for the confusion. Some of the non-linearity between the response of the red and blue filter should be explained in the post I d..." | Read more » | over 10 years ago | |||
| nedhorning | "One drawback of using the red filter is that the red part of the bayer filter passes more NIR than the blue or green parts. I'm looking into ways t..." | Read more » | over 10 years ago |