| Author | Comment | Last activity | Moderation | ||
|---|---|---|---|---|---|
| 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 8 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 8 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 » | over 8 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 9 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 9 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 9 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 9 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 9 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 9 years ago | |||
| nedhorning | "Hi Roolark - Make sure you didn't disconnect or tear one of those thin ribbon cables. That's the only thing I can thing of that would cause that pr..." | Read more » | about 9 years ago | |||
| nedhorning | "I agree a forest is not a good calibration site. For aerial and satellite sensors a popular calibration site is White Sands in New Mexico. It has w..." | Read more » | over 10 years ago | |||
| nedhorning | "Another possibility for a forests area is Hubbard Brook Experimental Forest in New Hampshire but that might be a nightmare getting permission unles..." | Read more » | over 10 years ago | |||
| nedhorning | "Chris - If you are referring to JPEG images acquired using one of the camera's internal white balance settings then I don't think the histograms fo..." | Read more » | over 10 years ago | |||
| nedhorning | "What you describe seems like white balancing which I think of as more of a normalization process than calibration. White balance using a standard t..." | Read more » | over 10 years ago | |||
| nedhorning | "Jeff - I think a good way to get a handle on this is to apply a white balance before imaging. Again, assuming that the target you use for white bal..." | Read more » | over 10 years ago | |||
| nedhorning | "Hi Chris, Thanks for your comments. For me the most dramatic impact of white balance was the realization that there is very little difference in i..." | Read more » | over 10 years ago | |||
| nedhorning | "I thought the film I used was developed unexposed negative film but am not certain. I got the film from Jeff Warren so maybe he can clarify. There ..." | Read more » | over 10 years ago |