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Thought of the Day

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Thought of the Day

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  1. The development of our spiritual nature should concern us most. Spirituality is the highest acquisition of the soul, the divine in man, the supreme, crowning gift that makes him king of all created things. It is the consciousness of victory over self and of communion with the infinite. It is spirituality alone which really gives one the best in life. • Pres. David O. McKay • Conference Report, Oct 1936, p. 103 Thought of the Day IT 327 - Schweber Chap 14

  2. Schweber, Chap 14: TV/Video & Facsimile IT 327 - Schweber Chap 14

  3. TV/Video: A LegacySystem Par Excelance Really Old B&W TV, NTSC (≈1940) Color, NTSC (≈1950) B&W Movies (≈1910) Color Movies (≈1950) More Recent HDTV (≈2000) MP4 (≈1990) IT 327 - Schweber Chap 14

  4. TV: The Camera IT 327 - Schweber Chap 14

  5. TV: TheScreen 525 lines 384 pixels/line = 201,600 pixels 30 frames/sec Interleaved from 2 fields per frame IT 327 - Schweber Chap 14

  6. TV: Color Standards & Pixels IT 327 - Schweber Chap 14

  7. TV: Color Pixels IT 327 - Schweber Chap 14

  8. TV: TheSignal (Time Domain) Very tight tolerances on timing, frequency High tolerance for poor signal IT 327 - Schweber Chap 14

  9. TV: TheSignal (FrequencyDomain) Video: AM, vestigial sideband Frequency- multiplexed sub- carriers Audio: FM, narrow- band IT 327 - Schweber Chap 14

  10. TV: The Receiver IT 327 - Schweber Chap 14

  11. Justthe fax, please No gray scale: 1 = black, 0 = white At 200 pels/inch and 200 line/inch = 1700 x 2200 = 3.74 Mbits/page At 4800 bps = 13 min/pg = impractical Uses very significant spatial compression IT 327 - Schweber Chap 14

  12. Butwhatifyoucan’tcompressit? Andrew Jorgensen; Fall 2003 ORR substitute Pseudorandom pattern Cannot be spatially compressed 12 minutes, then crashed IT 327 - Schweber Chap 14

  13. Compression Lossy MPEG, MP3, JPG, GIF, MP4, OGG Compression ratios from 2:1 to 1000:1 Irreversible loss in quality, data Lossless ZIP, PNG, RAW, BMP, WAV, WMV Compression ratios from 1.1:1 to 2:1 Original data not lost and can be completely restored Methods of compression Mathematical Spatial Temporal HDTV @1080 x 1920 p = 2,073,600 pixels/frame; x 3 subpixels = 6,220,800 subpixels x 60 frames/second x 8 bits/subpixel = 2.986 Gbps (native) The magic of compression IT 327 - Schweber Chap 14

  14. MathematicalCompression IT 327 - Schweber Chap 14

  15. CompressionArtifacts IT 327 - Schweber Chap 14

  16. CompressionArtifacts IT 327 - Schweber Chap 14

  17. CompressionArtifacts IT 327 - Schweber Chap 14

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