DIG 2000 Lecture Notes - Lecture 12: High-Definition Television, Data Compression, Analog Transmission
Document Summary
Persistence of vision- latency in the eye"s response to visual stimulus. Present still images at a high enough rate to avoid flicker . Old days before digital, we had video signals, still use 2. Component- 3 separate cables, one each for r,g,b components. Composite- one cable, brightness and color are mixed into one barrier signal. Interlacing- each frame is divided into 2 fields. Monitor can draw 60 full frames each second. Frames have 525 lines, 480 are picture. Frame has 625 lines, 576 are picture, 4:3 aspect ratio. Have ability to transmit our info over a network. Compress sequences of frames by only storing the differences between them. Streaming- playback a video stream as it arrives over a network instead of downloading an entire clip and then playing it. Animation- the creation of moving pictures one frame at a time. Make a sequence of drawings on paper, in which character"s position changes slightly in each drawing in each drawing.
