Tagged with rolling - Personal View Talks http://personal-view.com/talks/discussions/tagged/rolling/feed.rss Sun, 05 May 24 17:05:03 +0000 Tagged with rolling - Personal View Talks en-CA Samsung NX1 UHD4k vs 1080p - Rolling Shutter and Resolution Crash Test http://personal-view.com/talks/discussion/12377/samsung-nx1-uhd4k-vs-1080p-rolling-shutter-and-resolution-crash-test Fri, 13 Feb 2015 08:09:01 +0000 eddavid 12377@/talks/discussions

This is a test shooting the Samsung NX1 in UHD mode 23.98 FPS and 1080p 23.98 FPS - both in PRO mode to see how it handles rolling shutter and resolution loss. My test chart was one of those magazine insert things that always fall out of your magazine when you are trying to read in the subway and someone comes up to you and says, "hey you dropped your thingy." and they want you to pick it up because it's littering but they say it like maybe you want to hold onto the magazine insert, to avoid confrontation. I wonder if the world still needs these magazine insert thingies? Maybe it's time to stop littering, magazine people? Actually I shouldn't be so hard on the magazine people, I love magazines and I need them to keep existing and if it requires them to have these annoying insert thingies, let them be. I need to accept other people for who they are. I am working on this. But anyway back to the test.

I transcoded using wondershare at -25 contrast - sorry guys I can’t figure out iffmpeg!

Shot at 800 ASA, 1/60 shutter, 23.98 FPS

Shot with Leica R 50mm f/1.4 lens at F stop 2.8. Focued on center text with zoom tool.

I lit it with some weird LED light so that it would flicker a lot and cause even more rolling shutter shenanigans - to see what's going on with the rolling shutter from a scientific perspective. But I'm not a scientist, I'm mostly just faking it till I make it.

Shot at Gamma DR with master per up +10 and contrast down -3.

Then I increased resolution 200% then 300% then 400%

Results - the rolling shutter is so much better in 1080p mode, and the loss of resolution is there - is it enough to bother me ? No, actually I’m not that into resolution anyway - I think rolling shutter is a much greater evil.

How does 1080p affect the image beyond rolling shutter and sharpness - highlight handling looks similar from this weak test. Color looks similar too. Less resolution and maybe edges less defined might make the image more organic and smoother.

Woo hoo

I think we can help make the world love the little Samsung NX1. The little engine that could. The outsider. Next test - Sony A7S 4k to Odyssey 7q in Full frame mode vs Samsung NX1 in 1080p mode. Resolution and rolling shutter and dynamic range and highlight handling.

]]>
Rating sensors readout speed http://personal-view.com/talks/discussion/9578/rating-sensors-readout-speed Sun, 09 Feb 2014 22:06:22 +0000 Ze_Cahue 9578@/talks/discussions After the GH4 release its becoming popular the sensor readout speed on the technical specification (50ms over 100ms GH3). Before that we was just guessing by comparing rolling shutter video tests between cameras.

The question: is out there a list of sensors readout speed rated in ms?
How fast is the Alexa readout in ms? How about Red, Sony and Canon cameras?

]]>
Rolling Shutter Artifacts Removal by Youtube http://personal-view.com/talks/discussion/3124/rolling-shutter-artifacts-removal-by-youtube Sun, 06 May 2012 17:44:43 +0000 Roberto 3124@/talks/discussions So much for posting Jello examples on You Tube..

Google Research: .. starting from May 4, 2012, Google implemented rolling shutter removal .... The before and after videos below show the effectiveness of the new Youtube algorithms:

http://www.youtube.com/watch?feature=player_embedded&v=627MqC6E5Yo

http://www.youtube.com/watch?feature=player_embedded&v=ATOrwKoREuQ

From

http://image-sensors-world.blogspot.com.au/2012/05/image-stabilization-and-rolling-shutter.html

]]>
Does ETC Mode Affect Rolling Shutter Jello? http://personal-view.com/talks/discussion/3075/does-etc-mode-affect-rolling-shutter-jello Wed, 02 May 2012 02:32:09 +0000 mpgxsvcd 3075@/talks/discussions This video shows the Jello Effect when ETC mode is used. I used the 14-140mm @ 35mm plus the 3.9x 720p ETC and the 14-140mm @ 140mm to give the same equivalent field of view.

I filmed passing trucks at the same speed with 1/250th shutter speed. I could not tell any difference in the angle of distortion between the two clips. A lot people think that rolling shutters only affect the video if the camera is moving. It will actually slant vertical lines if the subject is moving fast enough horizontally even if the camera is still.

I do not believe that using ETC mode over just the lens has any affect on the rolling shutter jello effect. Theoretically sensor readout speed is the only thing that could affect it. Using ETC mode should reduce the number of pixels that the camera reads. However, that does not appear to help at all. Instead it appears to read the entire sensor in the same time that it takes to read it without using ETC. Maybe it is just throwing out the data the ETC mode doesn't need?

]]>
Olympus Rolling Shutter EM-5 http://personal-view.com/talks/discussion/2546/olympus-rolling-shutter-em-5 Sat, 10 Mar 2012 15:09:38 +0000 DrDave 2546@/talks/discussions If only 24p....... http://www.youtube.com/watch?feature=player_embedded&v=9sUNWz3O42Q

]]>