Created a Peer Reviewed Display Blur Test (Pursuit Camera)

Many sites including LinusTechTips, RTINGS, TomsHardware, and others use the free Blur Busters pursuit camera invention. Now also avaialble as a rail-less smartphone wave, too!
igluk
Posts: 9
Joined: 15 Apr 2015, 21:38

Re: Pursuit Camera Tests (Peer Reviewed)

Post by igluk » 08 Feb 2017, 09:40

New Rtings video with Pursuit Camera Test

https://www.youtube.com/watch?v=vNb3X1AM6uI

User avatar
Chief Blur Buster
Site Admin
Posts: 7751
Joined: 05 Dec 2013, 15:44
Location: Toronto, Ontario, Canada
Contact:

Pursuit Camera Tests (Peer Reviewed) - For Display Reviews

Post by Chief Blur Buster » 08 Feb 2017, 12:02

Hello,

Yes, it is a fantastic video. The best video I've ever seen about the Blur Busters technique that RTINGS implements for their motion blur photography!

phpBB [video]


They credit Blur Busters at the end at 3m10s.

Play this video at 60 frames per second for the best demonstration.
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: 7751
Joined: 05 Dec 2013, 15:44
Location: Toronto, Ontario, Canada
Contact:

Re: Pursuit Camera Tests (Peer Reviewed) - For Display Revie

Post by Chief Blur Buster » 12 Feb 2017, 23:28

For testers/reviewers wanting to interpret imperfect pursuit-camera photos more closely, here's a new infographic:

Image

Granted, there can be a lot of variances and asymmetry (e.g. speed changes that makes motion blurring very uneven, etc) but this is an excellent general rule of thumb to judge if your pursuit camera photos are good enough (for your accuracy target), or that you need to keep trying.

Generally, the momentum of a heavy camera will almost always not show meaningfully visible speed changes (within one exposure) when coasting mid-pursuit, so you'll usually get consistent leading/trailing motion blur error margin instead of asymmetric motion blurring due to acceleration/deceleration effects.

Occasional single-pixel color distortions (green, purple), like seen in this above photo, are caused by LCD inversion algorithms -- on certain 120Hz monitors you will see green/purple discoloration effects of certain moving single-pixel checkerboard test patterns. In general, just ignore these minor discolorations; they don't affect motion blur (albiet may sometimes slightly tint the color of motion blur).

That said, this infographic highlights the minimum extra motion blurring that gets added to imperfect pursuit photographs. Other error factors (camera focus, blurring by compression codecs, etc) are not included but are usually much smaller than this easily-measurable error margins.
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: 7751
Joined: 05 Dec 2013, 15:44
Location: Toronto, Ontario, Canada
Contact:

Re: Pursuit Camera Tests (Peer Reviewed) - For Display Revie

Post by Chief Blur Buster » 11 Mar 2017, 15:07

Well, I'll be damned!

...I've recently learned 2 reviewers are mid-air pursuiting their cameras successfully with subpixel precision. No camera rail!

At least 1 of them do it by a rapid-shoot feature (e.g. 24 photos per second, almost film-like) and then hunt for the sharpest photo quickly using a rapid photo viewer. I'm pretty sure software could be written to automatically find the sharpest photo of the whole bunch (least amount of motion blur). You can even use video too (assuming you can control exposure per frame), and find the clearest stillframe.

New research findings:
--> Mid-air hand pursuit camera is actually a scientifically-viable option too. Just hand-wave the camera while in auto-shoot mode.
--> HD or 4K Video is a legitimate alternative of camera auto-shoot, by giving you 24 frames or 30 frames per second; as long as you can adjust exact exposure length per frame. You hunt find the clearest stillframe, and use that as the pursuit camera photo.

Manual focus, manual exposure, manual iris (F stop), then you can essentially use video as a method of auto-shooting 30 photos per second. With a good player that can playback during slider sliding -- and also has single frame stepping -- you can quickly hone on that 'perfect' frame. No camera rail needed.

Note -- The pursuit camera temporal patterns are also compatible for use with motorized pursuit cameras (including those that have precision manual speeds not synchronized to the display) -- the temporal pattern can also double as accuracy verification for mechanical pursuit cameras. So the expensive mechanical setups can still benefit from the use of the temporal tick marks invention, too. So it cover all extremes from hand-waved smartphone cameras all the way to expensive mechanical pursuit cameras!
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: 7751
Joined: 05 Dec 2013, 15:44
Location: Toronto, Ontario, Canada
Contact:

Re: Created a Peer Reviewed Display Blur Test (Pursuit Camer

Post by Chief Blur Buster » 23 Jan 2019, 03:13

Want the world's easiest pursuit camera?

See Easy Pursuit Camera Thread
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: 7751
Joined: 05 Dec 2013, 15:44
Location: Toronto, Ontario, Canada
Contact:

Re: Created a Peer Reviewed Display Blur Test (Pursuit Camer

Post by Chief Blur Buster » 02 Aug 2019, 18:02

New article:

LinusTechTips Uses Blur Busters Invention to Take Photos of Display Motion Blur

This is probably one of the simpler Blur Busters explanations of why a pursuit camera is needed -- so check it out!

There are also new instructions to test it yourself with a hand-waved iPhone or Android
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: 7751
Joined: 05 Dec 2013, 15:44
Location: Toronto, Ontario, Canada
Contact:

Re: Created a Peer Reviewed Display Blur Test (Pursuit Camer

Post by Chief Blur Buster » 09 Aug 2019, 16:18

Just wanted to add to this thread.

Sometimes readers come up with really interesting "hacks" to achieve a pursuit camera, such as LEGO or LEGO-like blocks:
The pursuit camera, made out of LEGO-style building blocks.

Image

From the 2nd page of this thread: viewtopic.php?f=2&t=5619
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: 7751
Joined: 05 Dec 2013, 15:44
Location: Toronto, Ontario, Canada
Contact:

Re: Created a Peer Reviewed Display Blur Test (Pursuit Camera)

Post by Chief Blur Buster » 16 Mar 2020, 17:08

Two reviewers are making mistakes by violating test guidelines that cause me to be unable to trust the integrity of the pursuit camera photography, because the tickmarks are the evidence of scientific accuracy.

When photographing www.testufo.com/ghosting or other pursuit-camera compatible test pattern,
Please Follow Guidelines
Please Confirm Scientific Integrity

Image

Image

Image

Image

Pursuit Camera Instructions

[!] CRITICALLY IMPORTANT FOR TRUST [!]: Just because photo (or individual video frame) looks correct despite bad tickmarks, doesn't mean the photo can be trusted. The tickmarks is the trust. The tickmarks is hardcoded evidence of pursuit camera accuracy. Please help us trust the photograph by showing accurate tickmarks, please. Camera exposure must be at least 2x refresh cycle length minimum (and preferably about 4x refresh cycle), to represent aggregate human vision integration time accurately. Example: For 120Hz refresh rate -- that means 1/30sec camera exposure for photographs -- or 1/30sec exposure per video frame if doing video. For end users doing the easy rail-less method via smartphone hand-wave, try to get less than 1 pixelwidth error margin. For professional reviewers, try to get less than 0.2 pixelwidth error margin, if you can!

For those wondering how to use a pursuit camera for free:
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

Post Reply