Audacity

Video

Table of Content

1. 2. 3. 4. 5. 6. 7. 8. 9. Introduction Types of video signal Types of analog video signal Computer-based digital video Broadcast and video standards Characteristics of digital video Digital video data sizing Ways to reduce video file size Video file formats

Definition of Video

• Video:

• Technology of electronically

• Capturing / recording (captured media) • Processing / storing • Transmitting a sequence of still images representing scenes in motion. Note:

• Animation starts from discrete pictures and then process to illusion of continuous motion. • Discrete pictures  illusion of continuous motion

Types of Video signal

• Two types of Video Signal

• Analog video • Digital video

Analog Video Signal

• Analog video is transferred by analog signal. • It contains the

• luminance (brightness) and • chrominance (colour) of the image.

• Most TV still sent and received video as an analog signal.

Types of Analog Video Signal

• Three types of Analog Video Signal:

• Component • Composite • S-Video

Component Video

• Signals are split into 2 or more components; separates the:

• Luminance: brightness (Y) • Chroma: colours (U and v)

Advantage: Gives the best colour reproduction, since no “crosstalk” between the three different channels, unlike composite video and Svideo. Disadvantages: Requires more bandwidth and good synchronization of the three components.

Component Video

Composite Video

• Composite video = two or more signals are mixed into a single carrier wave.

Chroma (colours ) UV and Luminance (Brightness) Y = YUV

• Video quality not as good as component video.

Composite Video

S-Video

• S-Video = separates into 2 signals :

1. Luminance 2. Chroma

• S-Video is also known as Separate Video or Y/C.

• Y  Luminance  Brightness • C  Chroma  Colour

• The chroma or colour information is always combined into 1 signal. • Video quality better than composite video, worse than component...