Browse Prior Art Database

System for Detecting and Converting Color Image in Real Time

IP.com Disclosure Number: IPCOM000111247D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Saitoh, F: AUTHOR

Abstract

Disclosed is a system for detecting and converting colors in a color image in real time. Digitized color video signals in R(Red)-G(Green)-B(Blue) color space are converted to ones in another color space using three-dimensional look-up-tables. High speed memories are used as the look-up-tables for real time image processing.

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System for Detecting and Converting Color Image in Real Time

      Disclosed is a system for detecting and converting colors in a
color image in real time.  Digitized color video signals in
R(Red)-G(Green)-B(Blue) color space are converted to ones in another
color space using three-dimensional look-up-tables.  High speed
memories are used as the look-up-tables for real time image
processing.

      The Figure shows the hardware configuration of the system.
Each RGB color video signal from color TV camera 1 is digitized by
digital-analogue converter 2 and multiplexed and inputted to the
address bus 3 of high speed memories 4.  Rule data for detecting and
converting colors is set in the memories 4 by microprocessor 5 in
advance.  These memories are used as the logical three-dimensional
look-up-tables.  The system includes three look-up-tables for R,G and
B componets, each of which is addressed by R,G and B values of the
detected color.  Output data from data bus 6 of the memories are
converted to RGB analogue video signals by digital-analogue
converters 7.  Inputted color data is detected and converted by
overwriting look-up-tables.  For example, detection and conversion of
a specific color by the look-up-tables are executed as the following
steps.

1.  Converting the original RGB data into a different color space,
    e.g., HSI space comprising H(Hue), S(Saturation) and
    I(Intensity).

2.  Detecting a color in the HSI color space, e.g., yellow, which...