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Digital Processing of Analog Television Lior Zimet EE392J Final Project Winter 2002

Digital Processing of Analog Television Lior Zimet EE392J Final Project Winter 2002. Project Goals. Digitize an analog NTSC signal and decode it in software Use digital processing to perform Luminance and Chrominance separation Color demodulation Interlace to progressive conversion.

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Digital Processing of Analog Television Lior Zimet EE392J Final Project Winter 2002

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  1. Digital Processing of Analog TelevisionLior ZimetEE392J Final Project Winter 2002

  2. Project Goals • Digitize an analog NTSC signal and decode it in software • Use digital processing to perform • Luminance and Chrominance separation • Color demodulation • Interlace to progressive conversion

  3. System Block Diagram Display

  4. NTSC – 1D Analog Signal

  5. Composite Video Spectrum

  6. Y/C Separation – 1D Comb Filter • Resampling at 4xFsc will take advantage of the alternate phase in the color modulation • Y/C separation can be done within the field Y =( (Ycenter+Ccenter) + (YupperCupper)) / 2 C = ((Ycenter+Ccenter)  (YupperCupper)) / 2

  7. Y/C Separation – 2D Adaptive Comb Filter • 1D comb filter works perfectly only for vertically orientated structures in a picture • 2D adaptive comb filter: • Weighs the upper line and lower line combing according to horizontal edge detection • Uses notch filter in cases where 1D fails

  8. Y/C Separation – 3D Comb Filter • In still image, pixels are identical from frame to frame • The Chrominance phase is alternating • Must be disabled when motion is present

  9. Motion Artifacts Example

  10. Y/C Separation – 3D Adaptive Comb Filter

  11. Y/C Separation Example

  12. Color Information

  13. Color Demodulation

  14. De-interlacing • Merge fields or interpolate in the pixel domain • Use motion detector to decide

  15. Snell & Wilcox Pattern

  16. Sequence from “Cheer Leader”

  17. Decoded Frame from “Cheer Leader”

  18. Motion Detection • Apply small motion and large motion detection using adjacent fields Small Motion Large Motion

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