Format conversion preprocessing method and circuit
First Claim
1. A method for converting between a high resolution interlaced video sequence having two fields per frame and a low resolution progressive video sequence comprising the steps offiltering said interlaced sequence in the vertical-time domain with a low-pass linear filter having a diamond-shaped pass-band to form a first intermediate progressive sequence,filtering said first intermediate progressive sequence with a non-linear filter to form a second intermediate progressive sequence, anddecimating said second intermediate progressive sequence to form said low resolution progressive sequence.
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Abstract
A preprocessing method and circuit is utilized to convert a video sequence between a high resolution interlaced format used when the video sequence is read out of a storage medium and a low resolution progressive format suitable for compression encoding at a low bit rate. In accordance with the inventive format conversion preprocessing algorithm, the video sequence in the high resolution interlaced format is first processed by a linear filter with a diamond-shaped passband in y-t space. The output of the linear filter is processed by a non-linear filter and the resulting signal is then decimated to produce the video signal in the low resolution progressive format. The inventive preprocessing algorithm serves to eliminate aliasing, noise, and jerkiness of motion from the sequence in the low resolution progressive format.
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Citations
7 Claims
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1. A method for converting between a high resolution interlaced video sequence having two fields per frame and a low resolution progressive video sequence comprising the steps of
filtering said interlaced sequence in the vertical-time domain with a low-pass linear filter having a diamond-shaped pass-band to form a first intermediate progressive sequence, filtering said first intermediate progressive sequence with a non-linear filter to form a second intermediate progressive sequence, and decimating said second intermediate progressive sequence to form said low resolution progressive sequence.
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5. A circuit for converting between a high resolution interlaced video sequence and a low resolution progressive video sequence comprising,
linear filter means having a diamond-shaped pass band for filtering said interlaced sequence in the vertical-time domain, to form a first intermediate progressive sequence, a non-linear filter for filtering said first intermediate progressive sequence to form a second intermediate progressive sequence, and means for decimating said second intermediate progressive sequence to form said low resolution progressive sequence.
Specification