Computer Science 1033A/B Lecture Notes - Divx, Real Time Streaming Protocol, Digital Media Player
10 Sep 2013
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COMPSCI 1033A/B Full Course Notes
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Video: sequence of still images or frames that create the illusion of movement when played in succession. Analog camcorder: electronic impulses are recorded, must be converted using a video capture card to digital before it can be used. Information is sent as 0s and 1s, and therefore there is no need to convert: little bit of compression is done within the camera (dv 25 format) Pixel dimension : 720 x 480 (3:2 ratio) Color compression in the camera: for still images, rgb color model is commonly used, for video, yuv (yiq) or ycbcr model is used. Y = luminance / brightness (used by black and white tv) Uv or cbcr = chrominance / color / hue: human eye detects change in brightness because we have more rods (which detect brightness) compared to cones (which detect color). Therefore, video compression reduces color information and keeps brightness info: color sampling (compression technique for video):
