Terminology Dictionary

[Dogway]

There are some webs, there is wikipedia, and common sense, but I thought it would be nice to make a sticky thread for the newbies and not so newbies with terminology frequently used in the AV forums like this one. I remember my first days thinking I would never get to understand anything posted here, and now I can get the grasp of it, but many people still dont, and/or are confused on the right use of the tools.

So a useful thread with users suggesting descriptions, and updating the first post, with external references if necessary.
Terms like:

Encoder:
Decoder:
Codec:
Resizer/Scalers:
Interpolation:
Motion Blur:
Motion Estimation:
Aliasing:
Interlaced:
Progressive:
Compression:
lossy:
lossless:
kernel:
convolution:
dither:
AR:
Grain:
Noise:
Denoiser:
ColorSpace:
Sharpening:
contrasharpening:
...

[Sharktooth]

why? just google...

[kypec]

There is a website (http://codecdictionary.com/) dedicated already for this very purpose I think...

[Dogway]

@Sharktooth: Do you know what a loop is? I find a term in doom9, I search for it on google, google takes me to doom9, I find a term in doom9...:rolleyes:
But it's ok, Im trying to help the forum, not being selfish. As you can see this is not something I do for me.

@kypec:That dictionary is good, hope people get to know of it, at least from reading in this thread, and improve it soon.

cheers

[Gavino]

There is already the glossary on Doom9 at http://www.doom9.org/glossary.htm, though it's far from complete.

Another useful one is http://www.videohelp.com/glossary.

[Dogway]

oh glossary! thanks gavino. Didn't realise as I barely use the home web. Videohelp one looks close to my idea, albeit of course belongs to videohelp, and Im posting on doom9.

[Nightshiver]

Who cares where it is? It only matters that there is one. "Most people" are confused as to what tools to use because they are either to stupid or to lazy to simply search the forum themselves, as so far for pretty much every question the new people ask, it has already been answered many times over. It rarely if ever gets complex enough in terms that people can't find the information on this forum.

[codecdictionary]

There is a website (http://codecdictionary.com/) dedicated already for this very purpose I think...

Hey,

Its great that you shared my little project. :thanks:

I have not been in touch with the dictionary to add more terms and definitions. But, the whole concept of this dictionary is for the concerned people to contribute their understanding of terms.
E.g. If you want to contribute your definition of motion-estimation. How would you do that? Although the process will not change (for a long time atleast), but everyone has a different way of expressing the concept which makes it useful and better for new-comers in this field to grasp the concept.

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@codecdictionary

[codecdictionary]

Guys, I am looking for new words/phrases related to A/V Codec or multimedia domain so that the glossary may become more useful. Let me know or just add new word in the "Feature Request" area on the site. Alternatively write me @codecdictionary or as a reply to this thread.

For chrome users, install codecdictionary as App from http://bit.ly/jtuYy7 for instant access.

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[Dogway]

I really liked Didée's explanation (http://forum.doom9.org/showthread.php?p=1264414#post1264414) of different motion processes

As for Multimedia I made a pack for myself, this is a part of the readme.txt

AVC: Advanced Video Codec (H.264)
ASP: Advanced Simple Profile (H.263) Xvid/Divx
VC-1: Video Codec 1 (SMPTE 421M) Microsoft's codec (i.e.wmv)
DXVA: Direct X Video Acceleration
ffdshow: fast forward direct show
MPC-HC: Media Player Classic - Home Cinema
HTPC: Home Theater Personal Computer

Maybe you can also add low-pass and high-pass filtering as for used in the forums. Its something I never get to fully understand.
You can also add:
I/O
Dolby ProLogic
PAR
DAR
SAR
4:2:0
4:4:4
and the rest of common spaces...
Demultiplex
Renderer
Splitter
Calibration
Spectrometer
Colorimeter
Profiles
Color matrices (709,601...)
Gamut
Cie
Rendering Intent
(Calibration) Target
Proof(ing)
LUT
CGI (as for Computer Graphics/Generated Images)
MSB
LSB
Kernel
IIR (Infinite Impulse Response)
FIR (Finite Impulse Response)
DFT (Discreet Fourier transform)
FFT (Fast Fourier transform)

Types of noise/artifacts:
grain
mosquito
perlin
Salt-and-pepper
fizz
quantization
Blocking
posterization
banding
Gibbs effect
Ringing
Halo
Ghosting

this (http://en.wikipedia.org/wiki/Image_noise) is a good source

There are many I don't know, and other bunch I wouldn't know how to explain besides I don't feel "qualified" enough for that, but I can help with some.
I also found this dictionary (http://www.iptvdictionary.com/IPTVDictionary-Artifacts-Definition.html) although it is more focused on the AV industry rather than Image Processing