Author Topic: Updated MLVFS supporting Canon HW compressed MLVs  (Read 11876 times)

The_bald_guy

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #75 on: November 18, 2017, 09:22:35 PM »
I used the latest 2017-10-16magiclantern-crop_rec_4k firmware in 14bit lossless at 23.976fps 50th/sec on Komputerbay 128gig cards. I would get some crash on audio recording from the canon UI every once in a while, but we made it thought the shoot.

bouncyball

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #76 on: November 19, 2017, 09:27:06 AM »
Well, a1ex's comprehensive answer is a top notch as usual :)

a1ex

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Re: Updated MLVFS supporting Canon HW compressed MLVs
« Reply #77 on: November 19, 2017, 03:42:39 PM »
Got some half-decent results with this: https://github.com/pathak22/pyflow

For each frame:
- selected a few nearby frames (choice not critical, e.g. i-3 ... i+3 is fine, but some difficult frames will need more)
- computed a warped version from the nearby frames, using their demo script (only changed the file names)
- averaged the current frame and its warped versions => a temporally denoised frame
- from the difference image (denoised - original), kept only the vertical pattern (column medians) and discarded the rest

Seems to work as long as the camera is moved horizontally (otherwise it's hard to tell the difference between pattern noise and vertical objects in the image). When the camera motion stops, the pattern reappears (need to pick different frames).

Can you upload a few frames before and after your test image, graded in the same way? 15 JPEGs before and 15 after should be fine, just to run a quick test and have something to compare with. I've got this, but it's hard to judge when they don't have the same grading.