Introduction to Video ( part 2)

What is the colour system RGB:
The RGB colour model is an additive colour model which red, green and blue light is added together in various ways to reproduce a broad array of colours. The name of the model comes from the initials or red, green, blue. RGB is the colour system for computer monitors, video, etc. It is for computer application such as web sites.

Explain the video standars PAL, NTSC and SECAM, what are the main differences between them: 

PAL: (Phase Alternating Lines) is the analogue video format. PAL describes the way part of the colour information on teh video signal is reversed in each phase line.

NTSC: (The National Television Standards Committee) this format consists of 29.97 interlaced frames of video per second.

SECAM: (Sequentiel Couleur Avec Mémoire, french for ' Sequential Colour with Memory) is the analogue television system. It is also named because it uses memory to store lines of colour information, in order to eliminate the colour artifacts found on systems, using the NTSC standard of 29.97 frames. 


Which standard do we use in Australia:
PAL or PAL/ SECAM 


What is an IEEE 1394 port: 
This is a high-speed, serial input. output bus for for computer peripherals and consumer electronics, capable of transfer speeds of up to 400 megabits per second. IEEE supports a much higher bandwidth than a USB, allowing to get a high-resolution video camera onto a computer without issues. IEEE 1394 has became a computing standard for high bandwidth. IEEE 1394 is also known as 'FireWire' originating from Apple. 


Why do digital video camera use video compression:
Because of the relatively high bit rate of uncompressed video, video compression is extensively used. In the case of compressed video each frame requires a small percentage of the original bits.


Describe what a codec is: 
Codecs are software that enable your devices (Camera, Editor, Player) to perform video encoding and/or decoding. All these Codecs are based on standards. All video streams are embedded in multimedia (video) containers.  If your system does not have the proper Codec installed the program won't work.

What is meant by "generation loss," where does it happen: 
Refers to the loss of quality and potential increase of file size between subsequent copies of data. Anything that reduces the quality of the representation when copying, and would cause further reduction in quality on making a copy of the copy, can be considered a form of generation loss.
Generation loss occurs with increased distortion, increased noise, change in frequency response, and change in the relative phase of one frequency component with respect to another.