Method and system for improved reconstruction of video images in line sequential chroma format

Patent 4635098 Issued on January 6, 1987. Estimated Expiration Date:

January 9, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3781463

Digital processing of PAL color television signals in the form of a Y signal and a composite U+V/U-V signal
Patent #: 4051516
Issued on: 09/27/1977
Inventor: Weston

Method and system for transmitting and/or recording color T.V. signals
Patent #: 4245235
Issued on: 01/13/1981
Inventor: Poetsch

Method and system using sequentially encoded color and luminance processing of video type signals to improve picture quality
Patent #: 4335393
Issued on: 06/15/1982
Inventor: Pearson

Color slow scan video signal translation Patent #: 4516151
Issued on: 05/07/1985
Inventor: Stahler

Inventor

Thong, Tran

Assignee

Tektronix, Inc.

Application

No. 06/569434 filed on 01/09/1984

US Classes:

348/489, Time division multiplexing of luminance and chrominance (e.g., MAC)348/491Simultaneous and sequential (e.g., SECAM)

Examiners

Primary: Shepperd, John W.

Attorney, Agent or Firm

International Classes

H04N 9/797 (20060101)
H04N 9/82 (20060101)
H04N 9/83 (20060101)
H04N 9/81 (20060101)
H04N 11/08 (20060101)
H04N 11/06 (20060101)

Abstract

A method and system for reconstruction of chroma component segments in a line sequential chroma format television system. Filtering of a received line sequential chroma signal is employed to reconstruct missing chroma components and to attenuate phantom frequency components greater than one half the spatial sampling rate. Digital and analog filters are disclosed for implementation of such post filtering. The luminance component of the line sequential signal is delayed at the transmitter to synchronize the reconstructed chroma segment with its corresponding luminance segment with the use of minimal hardware at the receiver. Horizontal offset chroma sampling is used along with such post filtering to decrease transmission bandwidth requirements without sacrificing horizontal resolution at the receiver.

Other References

Broder Wendland, High Definition Television Studies on Compatible Basis with Present Standard, Television Technology in the 80s, SMPTE, pp. 151-165, 1981
G. Tonge et al, Line Sequential Color Transmission and Vertical Filtering in MAC, IBA, GT V1 EVSS 114