Inactive-Withdrawn Standard

IEEE 202-1954

IEEE Standards on Television: Methods of Measurement of Aspect Ratio and Geometric Distortion

IN A TELEVISION SYSTEM, it is through the agency of the scanning process that the two-dimensional space function, comprising the image at the camera, is transformed into a one-dimensional time function for transmission; at the receiver, the reverse procedure is used to recreate the image. Ideally, the velocities of the scanning apertures should be uniform in both the horizontal and vertical directions; furthermore, these two directions of motion should be orthogonal at all points in the raster. Finally, the ratio of the maximum excursions of the apertures in the horizontal and vertical directions of the transmitted picture, i.e., the aspect ratio, should be the same at both the transmitter and receiver. If there is departure from any of these conditions, geometric distortion results (except in the trivial case where the transmitter and receiver happen to contain compensating errors). It should also be noted that even in the case where the scanning aperture itself meets the desired conditions, the optical systems may contribute to the total geometric distortion; this applies to either the transmitter or receiver.

Sponsor Committee
BTS -
Learn More About BTS -
Status
Inactive-Withdrawn Standard
History
Published:
1953-11-30

Working Group Details

Society
IEEE Broadcast Technology Society
Learn More About IEEE Broadcast Technology Society
Sponsor Committee
BTS -
Learn More About BTS -

Other Activities From This Working Group

Current projects that have been authorized by the IEEE SA Standards Board to develop a standard.


No Active Projects

Standards approved by the IEEE SA Standards Board that are within the 10-year lifecycle.


No Active Standards

These standards have been replaced with a revised version of the standard, or by a compilation of the original active standard and all its existing amendments, corrigenda, and errata.


No Superseded Standards

These standards have been removed from active status through a ballot where the standard is made inactive as a consensus decision of a balloting group.


No Inactive-Withdrawn Standards

These standards are removed from active status through an administrative process for standards that have not undergone a revision process within 10 years.


No Inactive-Reserved Standards
Subscribe to our Newsletter

Sign up for our monthly newsletter to learn about new developments, including resources, insights and more.