Author Topic: Bracketed exposures and HDR  (Read 4392 times)


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Bracketed exposures and HDR
« on: April 15, 2016, 03:20:29 PM »
I just tested a workflow that is cumbersome, but useful: Shoot bracketed (0, -2EV, +2EV) exposures, merge to 32-bit HDR, save as OpenEXR, process in PhotoScan. It gives some good results, but the work for a large dataset is prohibitive.

Would it be possible to add functionality to:

1) Analyze the photo capture time/exposure/filename in the EXIF data, and then bracket stacked exposures
- I see this working as a separate option pre-alignment, that works in combination with the existing photo analysis tool. First the quality of the exposures are checked, and then the stack is checked for alignment, and then a score is produced for the stack.

2) Automatically stack the bracket into a 32-bit OpenEXR for point cloud analysis.

This would be extremely helpful for creating interactive 3D environments, such as in a game engine.



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Re: Bracketed exposures and HDR
« Reply #1 on: July 03, 2016, 04:18:13 AM »
I'm thinking... Wouldn't using one of those exposures to makes the scan be ideal, then using the HDR to apply the texture?  Does Photoscan do a better job to build geo using HDR images?  I was always under the impression that it preferred raw images without any processing.  Curious.  :)