Video Sampling. Road Map Basics of sampling Progressive Scanning Interlaced Scanning.

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Presentation transcript:

Video Sampling

Road Map Basics of sampling Progressive Scanning Interlaced Scanning

Basics

Scanning

Cont. Vertical resolution : Number of scan line per frame. Aspect Ratio : Ration of width to height. Frame/Field rate : 50 times per sec.

Sampling In signal processing, sampling is the reduction of a continuous signal to a discrete signal. In video processing, ideal sampler produces samples equivalent to the instantaneous value of the continuous signal/video at the desired points. In simple words, sampling means discretize the coordinate axis.

Spatio-Temporal Sampling Spatio-Temporal Sampling

Sampling Structure For Analog Video

Vertical-Temporal Scanning Orthogonal Sampling Structure Used for progressive scan Hexagonal Sampling Structure Used for 2:1 interlaced scan

Cont.

Sampling Structure For Digital Video Digital video can be obtained by sampling analog video in the horizontal direction along the scan lines.

Sampling Structure For Digital Video Orthogonal sampling structure Sampling Matrix V

Cont. Vertically Aligned 2:1 Interlaced Lattice Sampling Matrix V

Cont. Field-quincunx Sampling LatticeSampling Matrix V

Thank You