week 10 Flashcards
What does CODEC stand for
Compressor decompressor
What happens when you Compress a file
It’s destructive action
the data is lost and cannot be retrieved
What are two ways that I file can be compressed
Specially and Temporally
Bits are short for what
binary digit
What are bits
Binary by nature, meaning they possess a yes/no plus/minus on/off state
They are abbreviated by the use of lowercase B or KB
What are bitrates
How many beds are being sampled recorded expressed in a given period of time
Higher by rates mean what
Means that more information is being sampled recorded or played back
The greater the bit rate the greater the _______
File size
What are for pros of a high by rate
Higher image quality
Higher resolution
Hire frame rate
More movement between Frames
What are Macro blocks
A group of pixels collectively examined to make predictions about changes in the image
Compression algorithms
What are compression algorithms in relation to macro blocks
Compression algorithms look at what changes are happening between each macro block and make estimates about what the image should look like based on those changes
What are two factors that affect compression
Spatial redundancy
Temporal redundancy
What is spatial redundancy
Each image or frame is examined for any redundant pixels within a region or macro block
Similar pixels can be Consolidated to help reduce the file size
What is temporal redundancy
Redundancy over time
Multiple frames are compared for redundant pixels
What does intraframe versus interframe
Intraframe is spatial compression
- Every frame is compressed spatially
- Much easier for computers to process
Interframe is temporal compression
- Smaller file size but more processor intensive
Explain special compression
Every frame is compressed specially
Explain temporal compression
Takes two images several frame rates apart and makes predictions on what the frames in between should look like
What are two types of chroma subsampling
Composite video
Component video
composite video means
Taking a sample and embedding the colours from the sample into the rest of the image
Component video means
The signal is divided into three components
What are the three components of component video
Luminance Y: Green
R-Y: Red
B-Y: Blue
What’s the range of bit depth
8 bit to 16 bit
What bit depth does an HMC 150 have
Eight bit
What bitch that does a broadcast camera have
10 bit
