Triple field buffer for television image storage and visualizati

Details Triple field buffer for television image storage and visualizati Triple field buffer for television image storage and visualizati

1990-06-20

1994-03-01

Groody, James J.

Television

Format conversion

348571, H04N 701, H04N 5907

Patent

active

052912752

ABSTRACT:
Image conversion method and apparatus that provides for (a) storing in a first memory a first image field; (b) storing in a second memory a second image field; (c) reading the first and the second memories; (d) simultaneously displaying on a display screen the first and the second image fields as a single image frame; and (e) while performing the step of reading the method includes a step of storing in a third memory a third image field. The first, second and third memories are provided as a frame buffer having a 3.times.3 memory block organization. For image fields numbered 1, 2, 3, 4, 5 . . . n . . . the system of the invention reads the image fields two at a time in accordance with a predetermined sequence given by: 1 and 2, 2 and 3, 3 and 4, 4 and 5, (n-1) and n, n and (n+1). A high resolution frame length is selected to be longer than or shorter than a television field period. The phase difference between the two is measured and circuitry alters the predetermined read-out sequence to ensure that a field memory to be read will not also be required for simultaneously storing a next television field.

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