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Can you spot the camouflaged fish?

Virtual reality, explained with some trippy optical illusion

lucky760 says...

@newtboy - I'm blown away at how certain you are it's all fake. I suggest you do what I did: Instead of using paper on your screen, just take a screenshot and insert into an image editor and inspect things there.

I cut the three tiles out and pasted them side-by-side and they are in fact the same color: http://i.imgur.com/e5lcV5P.png

I dragged straight lines on the checkerboard before and after the dots were added, and it has only straight lines.

I copied/pasted the blue tabletop, rotated it and it fit perfectly on the other one: http://i.imgur.com/QzT8nc8.png

Nothing was fudged in the video. It just shows how powerfully your brain is latching onto what it believes it is seeing.

It's like that dress photo from a few weeks ago. "Is it white and gold or purple and black?!" Many people were hardcore in one direction or the other.

The only one that left me confused is the pills. 1) He said they were red and blue, but they were yellow and turquoise. 2) They had holes in the pills allowing the background color through; it was only there that they looked colored, otherwise they were just gray. I suspect they were just trying to shoe-horn in a red pill blue pill Matrix reference.

Virtual reality, explained with some trippy optical illusion

ChaosEngine says...

Sorry, newt, but that's simply inaccurate.

I saw two grey pills too, but you're completely wrong about the others. I screen shotted all the images into paint.net to verify them.

The rubix cube image is 100% real. The RGB values for the blue and yellow tiles are identical (127,128,129).

Same with the the tiles under the table. They are are off by a small amount (rgb 70 68 71 vs rgb 70 68 70), but I'd but that down to the video encoding.

Ditto with the checkboard; zooming in with paint.net the lines are pixel straight (there is some anti-aliasing at the edges, but it doesn't affect the "straightness of the checkerboard").

The tables too, are the same size. I rotated the vertical table.

If you don't believe me, try it yourself.

newtboy said:

OK. Looking extremely closely and using paper to block out the image, I have to say they fudged things on some of them.
I saw two grey pills the whole time.
The colored tiles fade to grey as they "mask off" the other tiles, they start no where near the shade of grey they end up as, their color has faded a lot in the process.
The grey tiles on the floor also change shades as they are 'masked off' quite clearly. I went 1/4 speed, and also tried masking them off myself, they clearly faked this one.
I put a straight edge on the checker board and sure enough, those lines are slightly curved....just barely but they are.
The two table tops are NOT the same size at first, I measured and the vertical table is definitely longer on the long side. That one's obvious.
The spinning dots does work for me, as do convex images and auditory illusions.
So I'm not ready to call 'fake' on this, but IMO it's fudged badly.

How Digital Light Processing (DLP) Works

spawnflagger says...

The Ti DLP chip is the most commercially successful MEMS device created. I own a DLP projector(720p) and a rear projection Mitsubishi DLP TV (1080p). I like that DLP chips can give you 3D (in a checkerboard pattern) basically for "free", and it looks better, IMHO, than other 3D displays which also use active-shutter glasses.

Some nitpicking - most home DLP projectors use a 6-color wheel, not 3.

He also didn't mention that most digital movie theaters use DLP - although this is a a more expensive system, because there are 3 light sources and 3 DLP chips (RGB) instead of having a color wheel - and they are larger chips with more mirrors.

Can You Trust Your Eyes?

bmacs27 says...

I think he chose his wording a little poorly. The purpose of perception is to estimate physical properties of the environment. It's just not meant to estimate the exact intensities and so forth. For example, in the Adelson checkerboard illusion, you are reporting your perception of the surface reflectances irrespective of illuminant. That's a perfectly sensible environmental property to estimate. It just isn't a direct mapping to the image falling on your retina.

747 Crosswind Landing at Hong Kong's "Kai Tak" Airport

sepatown says...

I'm no means an expert but I used to live there in the 80s and 90s as my dad flew for Cathay Pacific and I've only ever heard of the one 'Checkerboard' approach. Flying the jump-seat into Kai Tak was a magical experience as a kid.

sixshot said:

Landing at HK is never easy... and yes, only the most experienced should be allowed to fly in and land there. The way the runway was aligned along with the distance from the airport to the main city... it's mind-boggling for me. But of course, this probably can pale in comparison to other insane airports out there.

Maybe someone out there knows it... but I'm wondering about this: for landing there, is there any flight path that takes you straight in, rather than turning almost 180 on the approach?

The Roman Legion at War

Optical Illusion: Reverse Mindwarp

Optical Illusion: Reverse Mindwarp

Optical Illusion: Reverse Mindwarp

jonny (Member Profile)

Optical Illusion: Reverse Mindwarp

Optical Illusion: Reverse Mindwarp

*LIVE* Tragically Hip - Bobcaygeon

MINECRAFT: Forget everything you know about hiding chests.

1stSingularity says...

On one server I played on, I had a room with a 10x10 grid (checkerboard of course) of chests on the floor and ceiling (200 total chests), with the vast majority filled with gravel, stone, dirt and sand (all labeled, naturally). Now, the one that had all my good stuff in it was in the "sand" section on the ceiling.



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