Blur Busters Forums

Who you gonna call? The Blur Busters! For Everything Better Than 60Hz™ Skip to content

HELP! what is this?

NEW for 2017: Discussion about the www.TestUFO.com Blur Busters Motion Tests. Widely used by enthusiasts, display tweakers, reviewers, monitor manufacturers and VR headset makers!

HELP! what is this?

Postby kisushotto » 09 Nov 2018, 17:56

Bought Acer Predator x34p it has been doing this right out of the box both overclocked and non overclocked g sync on and off. Does this count as frame skipping? https://imgur.com/a/C6C8K7f
kisushotto
 
Posts: 1
Joined: 09 Nov 2018, 17:35

Re: HELP! what is this?

Postby RealNC » 09 Nov 2018, 18:50

That does look like skipping. Or a browser bug :-/

Try with as many different browsers as possible.

Do you see "hiccups" in games that have smooth movement? Like in a game where you can press shift to walk slowly, while looking at the floor, do you see skips?
TwitterSteamGitHubStack Overflow
The views and opinions expressed in my posts are my own and do not necessarily reflect the official policy or position of Blur Busters.
User avatar
RealNC
 
Posts: 2730
Joined: 24 Dec 2013, 18:32

Re: HELP! what is this?

Postby Chief Blur Buster » 16 Nov 2018, 01:57

The link is broken -- that image is now deleted.

I assume you discovered the problem and the Acer X34p is working fine?
Head of Blur Busters - BlurBusters.com | TestUFO.com | Follow @BlurBusters on Twitter

       To support Blur Busters:
       • Official List of Best Gaming Monitors
       • List of G-SYNC Monitors
       • List of FreeSync Monitors
       • List of Ultrawide Monitors
User avatar
Chief Blur Buster
Site Admin
 
Posts: 6312
Joined: 05 Dec 2013, 15:44

Re: HELP! what is this?

Postby RealNC » 16 Nov 2018, 05:35

Chief Blur Buster wrote:The link is broken -- that image is now deleted.

It was weird. Some of the boxes were partially lit. Normally, a box if either unlit or lit. In this case, part of a box was unlit, and some part of it was lit.
TwitterSteamGitHubStack Overflow
The views and opinions expressed in my posts are my own and do not necessarily reflect the official policy or position of Blur Busters.
User avatar
RealNC
 
Posts: 2730
Joined: 24 Dec 2013, 18:32

Re: HELP! what is this?

Postby Chief Blur Buster » 16 Nov 2018, 22:30

RealNC wrote:
Chief Blur Buster wrote:The link is broken -- that image is now deleted.

It was weird. Some of the boxes were partially lit. Normally, a box if either unlit or lit. In this case, part of a box was unlit, and some part of it was lit.

For http://www.testufo.com/frameskipping
That's probably a slow camera sensor scanout temporally interacting with display scanout.

If your camera creates jelly effect during fast pans, that's a slow camera sensor, and can generate this strange artifact. Especially with PWM backlights and strobe backlights. But has happened on high-Hz sample-and-hold displays with slow camera sensors too. However, most modern cameras now have sensor scans faster than the refresh cycle of a high-Hz monitor.

One can compensate for that effect by stepping back further away from the display before taking a photo. A half-height scan is done in half the time, so you can eliminate this artifact simply by stepping away from the monitor and making sure that the photographed grid covers less vertical height of a landscape photograph (the camera sensor scan direction is top-to-bottom or bottom-to-top when the camera sensor is in landscape mode).

Also, make phone camera in landscape mode, not portrait mode. This is usually not important for fast sensors, but it can help slow camera sensors -- to keep the scan direction along the same axis on both screen and the camera. Landscape photo of landscape monitor, keeps the scan more in sync.

This kind of artifact is rare but when this happens, it's easily fixed by doing 1 and/or 2 and/or 3. Doing only one of the below may be all you need, but you may need to fix multiple factors.
1. Use phone camera in landscape mode when photographing monitor
2. Use longer camera exposure.
3. Don't photograph with large squares (e.g. too close to monitor or using too few squares), instead use a denser grid or step further away from monitor
Head of Blur Busters - BlurBusters.com | TestUFO.com | Follow @BlurBusters on Twitter

       To support Blur Busters:
       • Official List of Best Gaming Monitors
       • List of G-SYNC Monitors
       • List of FreeSync Monitors
       • List of Ultrawide Monitors
User avatar
Chief Blur Buster
Site Admin
 
Posts: 6312
Joined: 05 Dec 2013, 15:44


Return to Test UFO Motion Tests

Who is online

Users browsing this forum: No registered users and 2 guests