Moving Pictures

Question 1

frames per second (fps)

Answer 1

24 fps or greater allows human eye to perceive an illusion of continuous movement

Question 2

TV vs. computer

Answer 2

tv images composed of interlaced images (tv pixels rectangular), computer images are reproduced as full images and the pixels are quadratic

Question 3

SD (Standard Def)

Answer 3

a television system which uses a resolution that is not considered to be either high or enhanced definition. The two common SDTV signal types are 576i, with 576 interlaced lines of resolution, derived from the European-developed PAL and SECAM systems, and 480i based on the American NTSC system.

Question 4

HD (High Def)

Answer 4

two image formats: 720p and 1080i.

720p: resolution is 1280x720px, so the full frame is always transmitted. “p” stands for progressive
1080i: image is created with the aid of two successive semi-images: interlaced technique

Question 5

lossless compression

Answer 5

a class of data compression algorithms that allows the original data to be perfectly reconstructed from the compressed data

Question 6

lossy compression

Answer 6

permits reconstruction only of an approximation of the original data, though usually with greatly improved compression rates (and therefore reduced media sizes