Author Topic: What's SBS 3D && Anaglyph 3D  (Read 3245 times)

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Offline Honeysingh16

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What's SBS 3D && Anaglyph 3D
« on: August 18, 2012, 07:23:01 pm »
What's SBS 3D && Anaglyph 3D
What Is SBS 3D?





SBS 3D, shorted for side-by-side 3D, is the best choice and widely used
3D movie and video format besides frame-sequential 3D when it comes to
airing 3D content over cable to 3D TV.

Side by side 3D content is one of the many 3D content format types, and
it is one of the most popular yet. While DLP 3D ready projectors and
newest 3D TVs prefer sequential 3D content,

side by side 3D content can be used too. In this article we will try to explain side by side 3D specifics,

where it can be used, why is it still so popular and the main advantages and disadvantages





Where Side By Side 3D Content Can Be Used?



While projector and TV manufacturers recommend sequential 3D content, side by side 3D can be used too in newest 3D TVs,

most modern 3D ready DLP projectors (like BenQ projectors), Plasma
televisions. BluRay players adopded sequential 3D content format,

but side by side 3D content is suitable for cable or air television and is in fact the most popular choise.

For the latest news some television providers in the U.S. have already
started first 3D tansmissions using side by side 3D content.

It is suitable for cable or air tansmissions because it uses the same bandwitch.



How SBS 3D Works?



In side-by-side 3D, a full 1080p or 720p frame is intended for both eyes
 at the same time with two halves on the left and right,

and the entire frame for the left eye and right eye respectively scaled
down horizontally to fit the left-half and right-half of the frame.

For example, for a 720p content (resolution of 1280 x 720), the frame
for the left eye will be 640 x 720 and the frame for the right eye will
also be at a 640×720 resolution.

When such SBS signal is received by 3D TV, the 3D TV will split each
frame to extract the frame for each eye, and then will rescale these
individual frames to a full HD resolution.

Then these individual frames will then be displayed alternately in a
frame-sequential manner which is in sync with your active shutter 3D
glasses.



Side By Side 3D Content Conversion To Sequential 3D



If the device is uncapable of showing side by side 3D content, 3D content can be converted to sequential 3D content.

To do that, the conversion unit (it can be Optoma's 3D XL converter or TV itself) do the convertion proccess.

Each frame of side by side 3D content is splitted into 2 frames - for the left eye and for the right eye.

As sequential 3D content need to be normal format, like 720p (1280 x 800 pixels of resolution),

left part of side by side 3D content frame has to be streched from 640 x
 800 pixels to 1280 x 800 pixels (pixels are interpolated - upscaled
using special upscaling alghorithms),

in that way the frame intended for the left eye is generated. And
equally right part has to be streched too, so the frame intended for the
 right eye would be generated too.

So if we have 50 frames of side by side 3D content, after convertion we would have 100 frames of sequential 3D content.






Advantage and Disadvantage of SBS 3D.



It's clearly that the disadvantage of SBS 3D is the halving of the
horizontal resolution of the image. And the quality of SBS 3D won't be
as good as sequential 3D content.

But this is not pretty much noticeable and won't affect 3D enjoying very
 much. Why SBS 3D is popular despite a downgrading of the output
quality?

For the advantages overweigh the disadvantage. First, SBS 3D uses the
same bandwidth as regular HD content, so it can be transmitted in the
same way that current HD signals are transmitted.

It is suitable for cable or air television, and also can be used in most
 of TVs (and some projectors). As a result, you won’t need an expensive
set-top-box replacement for viewing 3D content.

Besides this, SBS 3D is a nice way for you to copy and backup your 3D
BD. With SBS 3D output, your backup disc can be decreased to a half size
 (or even smaller) of the source 3D to save you money.

And what's more, the SBS 3D Blu-ray can be played in standalone 2D
Blu-ray Player and watched on 3D TV, so that you don't need to buy
expensive 3D BD Player.




What Is Anaglyph 3D?



Anaglyph images are used to provide a stereoscopic 3D effect, when
viewed with glasses where the two lenses are different (usually
chromatically opposite) colors,

such as red and cyan. Images are made up of two color layers,
superimposed, but offset with respect to each other to produce a depth
effect.

Usually the main subject is in the center, while the foreground and background are shifted laterally in opposite directions.

The picture contains two differently filtered colored images, one for
each eye. When viewed through the "color coded" "anaglyph glasses",

they reveal an integrated stereoscopic image. The visual cortex of the
brain fuses this into perception of a three dimensional scene or
composition.

The advantage of anaglyph 3D is that one can get 3D effect wearing anaglyph glasses just in a 2D display.

And the disadvantage is the 3D effect is not so good as real 3D. The
anaglyph 3D supported by DVDFab has up to 14 anaglyph modes like
red/cyan, green/magenta, amber/blue, red/green, and red/blue (monochrome
 / half color / full color / high quality Dubois).




Sequential 3D





As first 3D DLP (marked as "3D ready") projectors have shown up in
projector market in ~2009s, many people still wonder what 3D content is
suitable for these projectors?

One of the answers is sequential 3D content (for 3D ready DLP
projectors). Side-by-side 3D content is suitable as well, but lets talk
about sequential 3D content first.



What is Sequential 3D?



Sequential 3D content consists of frames - no surprise here. And every
second of each frame is intended for particular eye. For example,

if there are 1, 2, 3, 4, 5, 6... frames in a row, left eye is supposed
to see frames 1, 3, 5..., and right eye is supposed to see frames 2, 4, 6
 and so on.

Visualy it would look like this: left eye would see only the red frames, and right eye would see only the blue frames.

The content of such arranged frames is called sequential 3D content.




Sequential 3D content - red frames are intended for the left eye, blue frames - for the right eye.



Equipment and Requirements for Sequential 3D Content



For Image output you would need a 3D ready DLP projector or suitable 3D ready TV, of course.

Most of 2010s and later 3D ready TV models are capable of sequential 3D content, as well as side-by-side 3D content.

But as our website is projector-oriented, so it would be enough to say
that you would need a decent 3D ready DLP projector for sequential 3D
content display.





The Source currently (at March of 2011) could be a suitable PC only.

Minimum PC requirements for displaying sequential 3D content properly
are: processor: Intel® Pentium, Intel® Core™2 Duo, Intel® i3/i5/i7 Core,
 AMD Athlon™X2 CPU or higher.

Recommended OS: Microsoft Windows Vista 32/64 bit or Microsoft Windows 7 32/64 bit.

Graphic card (512MB VRAM Recommended): NVIDIA 240/250/Quadro series or
higher, ATI 4000 series or higher, or Intel GMA 4500 series. Memory - at
 least 1GB of RAM.





Source Solution. If you would like to use some other sources than PC for sequential 3D content,

there is a great solution in the projector market such as Optoma's 3D-XL
 converter box. This converter works not only with Optoma projectors,

but with any 3D ready DLP projector, and can make suitable sequential 3D
 content from virtually any of your 3D source - Blu-Ray player, Play
Station 3, Xbox and so on.





Glasses.
 For viewing sequential 3D content you will have to use specialised
active shutter 3D glasses with DLP link photo sensor (see in picture
below).

These glasses cost much more than passive red/blue passive glasses, because there is some tricky work they have to do.

As we talked above, sequentuel 3D content consists of frames, and every second of each supposed to be viewed by different eyes.

So at the moment while a frame intended for a right eye shows up - left glass becomes non-transparent.

And conversely - at the moment while a frame intended for a left eye shows up - left glass becomes non-transparent.

In this way each frame is seen only for the particular eye it was intended for.

As a result if sequential 3D content is displayed at 120 hz rate - you will see 60 hz rate video.




Quality of Sequential 3D Content



Advantage of Sequential 3D Content

 Contrary to side-by-side 3D, sequential 3D content is shown in full of it's resolotion,

so if the original is 1280*720 pixels - the frames for the left and for the right eye are also 1280*720 pixels of resolution.

In side-by-side 3D content there is a huge loss of horisontal resolution,

as frames for the left and for the right eyes are downsized in half -
from 1280*720 pixels of each eye recieves the frames of 640*720 pixels
of resolution frames.



Disadvantage of Sequential 3D Content

Loss of brightness. As we already talked about it above - each frame is intended for particular eye - left or right,

but not both at the same time. For example, if there are 100 frames - only 50 can be viewed by both eyes at the same time.

That means up to 50% loss of brightness. So if you are looking for
projector and the main purpose will be sequential 3D content - look for
brighter projector,

if possible (we recommend 3000 ANSI lumens and more).

                  
                  

Credit Goes to Sophie (Original Source)
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Offline DPSC

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What's SBS 3D && Anaglyph 3D
« Reply #1 on: August 18, 2012, 07:45:13 pm »
nice post  :clap1  

Offline Honeysingh16

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What's SBS 3D && Anaglyph 3D
« Reply #2 on: August 20, 2012, 10:49:34 am »
Quote from: DPSC on August 18, 2012, 07:45:13 pm
nice post  :clap1  

Thanks :angel:

 

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