Computer Science 1033A/B Lecture Notes - Lecture 5: Frame Rate, Ycbcr, Chrominance

• School: Western University
• Department: Computer Science
• Course: Computer Science 1033A/B
• Professor: Vivi Tryphonopolous

Document Summary

Video images when played in succession creates illusion of movement. Analog smooth electronic waves ex. conventional tv. Digital video each frame bitmapped graphic (stored as 0s and 1s) Sampling and quantizing motion: quantizing colour compression in video. Video yuv or ycbcr (mpeg compression) (model = color space) Camcorders: analog camcorder convert to digital before putting on computer to edit (use video capture card, digital video camcorder no need to convert. Bc info is sent in 1s and 0s. Dv25 most common compression: 720 x 480 pixels (3:2, frame aspect ratio 4:3 or 16:9, data rate 25 megabits/second, 29. 97 fps, colour sampling yuv 4:1:1. 4 = no compression, 0 = full compression. Avg out colour of pixels and turn them all into that one colour: ex. red, blue, purple, orange = purple (r+b=p) Sampling of a frame: analog tv began in 1939 using ntsc standard.