Browse Prior Art Database

Image Capture and Scan Conversion System

IP.com Disclosure Number: IPCOM000122743D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 69K

Publishing Venue

IBM

Related People

Fleek, AE: AUTHOR [+3]

Abstract

Disclosed is a system for simultaneously capturing live television-type video signals and displaying such signals on high frequency monitors in conjunction with text and graphics which are independently produced.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 55% of the total text.

Image Capture and Scan Conversion System

      Disclosed is a system for simultaneously capturing live
television-type video signals and displaying such signals on high
frequency monitors in conjunction with text and graphics which are
independently produced.

      Video input, conforming to any popular standard, such as NTSC
or PAL, is decoded into its components, e.g., YUV color difference
representation.  Alternatively, component RGB or YUV input is
accepted.  The component color information is digitized and stored in
dual-ported memory. The timing of this digitization and storage is
set by the timing of the video input signal and is independent of
other processes in the system.  The information written to memory is
buffered by a first-in, firstout memory (FIFO) to allow other memory
accesses.  The write process is interrupted by display and refresh
processes.

      Video signals are read from memory and converted to analog RGB
signals suitable for driving a monitor.  This output signal is
combined, through multiplexing or mixing, with the output of a
graphics display adapter.  The result is a composite image with the
graphics and video signals superimposed.  The timing of this memory
access and signal conversion is controlled by the timing of the
graphics adapter and is independent of the input process.  The
display timing can be chosen for optimal performance of the graphics
function and can be non-interlaced, providing video display quality
equal...