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Topic: photosynth from 1080p video

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xRez_Studio (Over 1 year ago)
I just did a synth from 1080p video frames to see how well it would work http://photosynth.net/view.aspx?cid=2c954b62-5526-4ddb-bc52-bdc09e1c2592 it appears to have worked well. It would be handy for those situations where you subject is not still for long or you don't have much time and you are primarily interested in the point cloud, not zooming. Has anyone else played with this?
Nathanael (Over 1 year ago)
The main drawback of using video is the typically high number of frames affected by motion blur, but you're right about it being the only way to capture some things that just won't hold still for long enough to photograph all the way around properly. Also consider that unless the video is of things that are static (the only thing moving is the camera) Photosynth will likely get confused since it currently assumes that the image features it finds belong to something stationary.

That being said, you are definitely not alone in thinking about this. Here are a couple of links along that line.

http://getsatisfaction.com/livelabs/topics/create_synth_from_hd_camera_footage
http://getsatisfaction.com/livelabs/topics/recreate_a_3d_scene_by_high_definition_video_camcorder
http://photosynth.net/discussion.aspx?cat=01b6f15f-42eb-49cb-a221-ed56615e1c47&dis=0d6d7eca-96c6-477f-b255-5d106d592eba
xRez_Studio (Over 1 year ago)
Thanks for the links Nathanael! Nice to have them all in one place.
Nathanael (Over 1 year ago)
Sure thing. 

I'll grant you that not all of them relate to 1080p video and the search result links need to be copied to the end of the white text and pasted in to the address bar, but that should give a general idea of what's going on.
martym (Over 1 year ago)
We've worked with a variety of video sources.  Motion blur isn't a big problem depending on the camera settings and ambient lighting, daylight conditions even with a little MinoHD generally provide a blur free synth.  I think super resolution algorithms would be helpful for filtering video prior to synthing but as far as I know there aren't many tools available right now to do this type of processing.
charliewallace (Over 1 year ago)
I've just had some success with this.  There's an inexpensive app called VideoEnhancer that applies superresolution processing - I used it to upres my 720p video to 1080.  I found a really easy way to cut down the number of extracted frames using the free video editor VirtualDub: in the Video/FrameRate menu you can set it up to keep 1 out of N shots; then in File/Output (or something like that) you can tell it to extract the frames into a folder and select the type.  I kept 1 out of 5, then I stepped thru the set and deleted too-similar frames that you get when the camera isn't moving for a bit. VirtualDub supports many plugins, the DeShaker is also useful...
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