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Apparatus and method for vertically extending an image in a television system

  • US 5,793,433 A
  • Filed: 12/29/1995
  • Issued: 08/11/1998
  • Est. Priority Date: 03/31/1995
  • Status: Expired due to Term
First Claim
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1. An apparatus for vertically extending an image in order to display an input video signal having said image in letter box format having an aspect ratio of 4:

  • 3 on a screen having an aspect ratio of 16;

    9, said apparatus comprising;

    a field memory for storing pixel data of initial horizontal scanning lines of an input region which will be extended vertically, among said initial horizontal scanning lines of a field unit being inputted, and outputting said pixel data of said horizontal scanning lines of a region which will be extended vertically among said stored pixel data;

    line memories for sequentially inputting and delaying said stored pixel data outputted from said field memory by units of said initial horizontal scanning lines, the number of said line memories corresponding to a vertical extension ratio of said image; and

    low-pass filtering and sub-sampling means for low-pass filtering and su b-sampling by respectively multiplying filter coefficients, the value of the filter coefficients being determined by positions of new vertically extended horizontal scanning lines, by said pixel data of said initial horizontal scanning lines, each of said pixel data being delay-outputted with a different delay from said line memories, and by adding said multiplied pixel data in correspondence with said positions of said new horizontal scanning lines, to thereby output new pixel data of said new vertically extended horizontal scanning lines.

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