Video signal encoder capable of encoding video signal data of video signals having both conventional and greater aspect ratios while maintaining transformation block at a constant length
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United States of America Patent
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Nov 16, 1993
Grant Date -
N/A
app pub date -
Feb 6, 1992
filing date -
Feb 6, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an encoder for selectively receiving, blocking and coding by orthogonal transformation an image A with a screen aspect ratio which is greater than 4:3 or an image B with a screen aspect ratio of 4:3, when the image A is entered, it is divided into a basic screen with an aspect ratio of 4:3 corresponding to a central portion of a screen and an additional screen other than the basic screen. Coding is controlled so that a sum of coded data quantity of a specified number of blocks m of orthogonal transformation of the basic screen and a specified number of blocks n of orthogonal transformation of the additional screen is within a specified data quantity x. When the image B is entered, the coding is controlled so that a coded data quantity of the same number of blocks of orthogonal transformation as the specified number of blocks of orthogonal transformation m of the basic screen of the image A is within the same data quantity as the specified data quantity x.
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