Author Topic: Dealing with Focus Pixels in raw video  (Read 112658 times)

dfort

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Re: Dealing with Focus Pixels in raw video
« Reply #525 on: January 13, 2018, 09:22:04 PM »
Hey @theBilalFakhouri - @bouncyball updated mlv_dump on steroids with the latest focus pixel maps so going back to your shot, here it is processed through Adobe Camera Raw maxing out on the highlight recovery, clarity, vibrance and saturation. That should bring out any remaining focus pixels.

mlv_dump --dng --white-fix=4931


There is an area that still shows some focus pixel artifacts:



I doubt they would be a problem unless you stretch the image as far as I have. Adding chroma smoothing eliminates it and I don't see any other issues introduced by chroma smoothing.

mlv_dump --dng --white-fix=4931 --cs3x3


Click on the images to see them full size.

I take it you didn't use a VAF filter on your 700D. There are a few post production tricks you can use to get rid of the aliasing.

Let's see what happens.


Hum--is there a problem with the youtube tags on the forum? Here's the link: https://youtu.be/x3uZzVivlzY

Yep, some aliasing issues but that has nothing to do with the focus pixels.
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103

IDA_ML

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Re: Dealing with Focus Pixels in raw video
« Reply #526 on: January 13, 2018, 11:04:27 PM »
Amazing work, Dfort and Bouncyball! Congratulations!  I can't wait to test the new MLV_Dump on the 100D.   

Dfort, could you please post a download link to the latest focus pixel maps, so I can test with MLVFS?  Do I just replace the old maps with the new ones in the MLVFS directory or there is more to it?  Thank you.

dfort

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Re: Dealing with Focus Pixels in raw video
« Reply #527 on: January 13, 2018, 11:47:05 PM »
The latest map files are in the ML Focus Pixels Bitbucket repository. Just replace the ones that are in MLVFS with these.
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103

IDA_ML

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Re: Dealing with Focus Pixels in raw video
« Reply #528 on: January 14, 2018, 12:44:27 AM »
Thanks a lot, Dfort.  I will test as soon as I can.

bouncyball

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Re: Dealing with Focus Pixels in raw video
« Reply #529 on: January 14, 2018, 12:33:21 PM »
MLV App also updated with:

1. Latest focus dots fix (kudos @dfort).
2. Correct aspect ratio according to RAWC block info.

dfort

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Re: Dealing with Focus Pixels in raw video
« Reply #530 on: January 14, 2018, 10:12:34 PM »
Made some more changes on the fpm.sh script.

When in doubt whether to use mv720 or crop_rec map files, default to crop_rec because it will work with either video mode.

Using the -n option to create full raw buffer sized maps will also default to crop_rec because it is assumed that these map files will be used in MLVFS that can't can't yet differentiate between crop_rec and mv720.

I also looked into removing dependency of the Crop metadata but it turns out that it is necessary to line up the map files properly.

Still todo -- run that 1-pixel offset map for mv1080crop mode only if it is 8...12bit lossless compression. Not a high priority because running additional passes that aren't really needed doesn't seem to hurt the image. At least not much.
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103

dfort

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Re: Dealing with Focus Pixels in raw video
« Reply #531 on: January 20, 2018, 07:16:32 AM »
Did some testing on the 100D. The 1:1 video modes, mv1080crop and zoom, could also have the focus pixels offset 8-pixels to the right. Discussion on the 100D topic.

Updated the map files for MLVFS, updated the MLVFS pull request and updated the fpm.sh script.
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103

IDA_ML

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Re: Dealing with Focus Pixels in raw video
« Reply #532 on: January 20, 2018, 04:35:56 PM »

IDA_ML

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Re: Dealing with Focus Pixels in raw video
« Reply #533 on: January 21, 2018, 02:08:55 PM »
Dfort,

Testing the latest January 20-th build for the 100D which allows handheld FRSPs with stabilized lenses, I noticed some focus pixels when shooting at Dual ISO 100/800.  Here are the original shot (size reduced) and a 100% crop from the area where they are clearly seen:





This is the original image.

Focus pixel area (100% crop) -> Here the "Add image to post" does not embed the 100% crop.  I don't know why.  So please magnify the above image and you will see the focus pixels along the edges of the cupboard doors.









dfort

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Re: Dealing with Focus Pixels in raw video
« Reply #534 on: January 21, 2018, 10:43:36 PM »
Are you referring to the colored area under the knobs?



These aren't focus pixels. You should get similar artifacts on the 7D (camera no focus pixels) as you do on the 100D (camera with focus pixels). That's why some ML users won't shoot without a VAF filter on their camera. Well, except for 5D3 users, note that you can't even get a VAF filter for the 5D3.
5D3.* 7D.* 700D.115 EOSM.* EOSM2.103