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Synchronized Filming of Interlaced VDU

IP.com Disclosure Number: IPCOM000063367D
Original Publication Date: 1985-Mar-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
O'Rourke, R Van Den Oever, WE [+details]

Abstract

A method of sync signal processing is disclosed which enables a standard synchronizable cine camera to capture both fields of a complete picture of a CRT-type visual display unit (VDU) which uses an interlacing system to form the picture. The field sync pulses are divided by two, and the resulting pulses are used to synchronize the camera. A light-emitting diode (LED) display is provided to enable a cine camera operator to adjust the camera sync delay control to eliminate the "black bar" effect seen when a cine camera is used to film a CRT display. When a cine camera is used to make a film of the data displayed on a CRT of a visual display unit, a common problem encountered is a rolling horizontal dark line or bar appearing on the finished film.