Talk:Rolling shutter

Cmos sensor

The cmos sensor is electrical and is slow therefore the lag/rolling shutter.

This isn't clarified well enough since a lot of electronics use this chip.

The pictures in the article are Cmos chip rolling shutter artifacts.

There should be a paragraph on this issue with Cmos chips.

Yes, but what is it?

The article, as it currently stands, skirts around the question and avoids explaining how Rolling shutter is implemented. Is it a mechanical device, or a special blanking waveform applied to the sensor? 83.104.249.240 (talk) 16:26, 6 January 2009 (UTC)[reply]

The real problem is that it doesn't deserve to be an article at all. Has nobody viewing this article ever used a slit-camera (or a Widelux)? Photographers today miss out on so much nifty stuff. —Preceding unsigned comment added by 131.215.115.31 (talk) 20:47, 20 August 2010 (UTC)[reply]

Great Example at BoingBoing

http://www.boingboing.net/2010/08/20/explain-this-photo.html

Spblat (talk) 22:14, 20 August 2010 (UTC)[reply]

I guess that this article is wrong because it swaps the effect of CCD and CMOS sensors. In fact, CCD sensors perform charge analog-to-digital conversion on pixel at a time (the have only one ADC) and consequently show a rolling shutter effect. Conversely, in APS sensors like CMOS, the AD conversion is performed in-sensor, i.e. each pixel performs contemporaneously the conversion. See for example http://www.dpreview.com/learn/?/key=sensors P4010 (talk) 08:27, 31 August 2010 (UTC)[reply]

Exposure windows for each pixel? Flash?

If I take a single exposure with a rolling shutter, how would I determine the exposure for each pixel? Suppose I have a 1/20s exposure and the rolling sweep is set to do a sweep in the same 0.0333 seconds (30fps) with 1000 rows of pixels. When I say "go", is it that the first row starts exposing, with the "exposure-begin" sweeping down, starting the second row at t=0.0333s/1000, etc. Then at t=0.05s, the first row is read, at t=0.05s+0.0444s/1000 the second row is read, etc?

Is that about right?

If so, can we use a flash as follows?: At t=0s, say "go", then at t=0.0333s (when all pixels are active), we trigger a flash for 0.001s, then at t=0.05s, the read begins. It seems like that would provide a full-frame exposure of the duration t=0.0333s to t=0.0433s. Is that right? —Ben FrantzDale (talk) 18:00, 15 November 2010 (UTC)[reply]

It looks like the answer is yes. [1] —Ben FrantzDale (talk) 18:08, 15 November 2010 (UTC)[reply]

Why does Global Shutter redirect here?

I wanted to research how global shutters work, and it directed me to this page. This article contains the line "This in contrast with global shutter in which the entire frame is exposed for the same time window." Hence, rolling shutters work differently from global shutters; therefore, they should each have their own page. I don't know how to change where it directs to, but I think at the very least, global shutters should be directed to its own page. —Preceding unsigned comment added by 108.64.158.109 (talk) 04:28, 19 April 2011 (UTC)[reply]

Youtube reference?

There is an excellent youtube video on this, here: https://www.youtube.com/watch?v=dNVtMmLlnoE with "worked examples". IS it de rigeur to use Youtube videos as references, or is this verboten? — Preceding unsigned comment added by 2001:8003:E448:D401:397D:C091:569F:5320 (talk) 04:20, 2 September 2019 (UTC)[reply]

No, it is not "de rigeur" to use YouTube videos as references (though I like your verbal flourish). We already have 3 in External Links, so I don't want to use a 4th. If yours is good, I'll try to replace one of the existing ones with it. Thank you for commenting.--FeralOink (talk) 22:45, 17 August 2024 (UTC)[reply]

Still or Movie?

"While some CMOS sensors use a global shutter, the majority found in the consumer market use a rolling shutter"

Now if I'm understanding things right, this statement is true for consumer video, but many consumer still cameras, including all the expensive ones, do in fact have real shutters for still photography. So although the opening paragraph refers to both still and video cases, the bulk of this article is only discussing the artefacts produced when taking video isn't it?

It would also be helpful to define what a 'consumer' device means in this context, e.g. is a Canon EOS6DII one of the devices we're talking about? Lots of consumers have one, but this is what many pros will be using for many use cases at work, for stills at least, and some cinema releases have been shot with them too. Are you classing these as rolling shutters? For stills? For video? Many thanks. Atconsul (talk) 16:19, 11 September 2020 (UTC)[reply]

Use in cryptanalysis

Not sure if this warrants a place in the page, and it would require a better description than I can give anyway. As explained here, the rapidity of the rolling shutter enables a side-channel attack by zooming the camera in on the power light of a device either performing (en|de)cryption or even simply connected to a shared power hub. This effectively increases the time-resolution of the video and makes a power-consumption side-channel accessible to the watcher. — Preceding unsigned comment added by 84.212.132.95 (talk) 19:28, 14 June 2023 (UTC)[reply]

Yes, i think the article should have a chapter about "Applications" for that

I came here to either edit the article myself or suggest it.

Your link in the comment is great, another could be [2] Bonsiscott (talk) 05:11, 13 August 2023 (UTC)[reply]

AMOLED Screen dimming

On OLED or AMOLED screens, lowering the brightness makes it flicker between what it normally displays at full brightness and a completely black screen (or so I've heard). If you use a fast shutter speed, you see black lines moving around. Can someone add this? Omegoat (talk) 00:27, 2 September 2024 (UTC)[reply]