Why does A. Luther recommend measuring the degree of image compression not by a ratio but by the number of bits per pixel required? How many bpp does one usually have before video compression? after?
How does redundancy relate to compression?
What are the advantages and disadvantages of making compression techniques adaptive?
For each of the following compression techniques, how does it work and what is an example of it that can be helpful for video compression:
- interpolation
- prediction
- transformation
- statistical or entropy coding
What types of error or distortion arise from using ADPCM? Is it useful for video compression - why or why not?
How do blocks, transforms and inverse transforms, and numerical errors all fit together?
Why is picking good quantizing parameters important with DCT?
How do data frequencies, code books, and adaptive codes fit into statistical coding?
For motion video playback from single-speed CD-ROM, how many bytes per frame are allowed? At 256x240 resolution how many bpp are involved on average? Why does that suggest using inter-frame compression?
Why is symmetrical compression and decompression desirable for motion video? Why is asymmetrical compression/decompression more sensible for high quality productions?
What types of error are introduced by using motion compensation? Why is it desireable to work with blocks? Why is parallel processing appropriate?
What are the modes of operation of JPEG? In what situations are these desireable?
What combination of methods are used in JPEG for each of the modes of operation?
How are blocks, DC component, and zig-zag ordering involved in JPEG?
What bpp yield what levels of image quality through JPEG?
What are the objectives of H.261? How do CIF and QCIF fit into those? What methods support the INTER and INTRA modes?
What are the objectives of MPEG?
Explain I, P, and B frames. How much space is needed for each, relatively?
Compare MPEG-1, -2 and -4 as to goals, status, and approaches used.
What is the difference between PLV and RTV when working with DVI? How does one specify compression for DVI and what issues relate?