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1. CA2118687 - IMAGE ANALYSER

Office Canada
Application Number 2118687
Application Date 11.09.1992
Publication Number 2118687
Publication Date 18.03.1993
Grant Number
Grant Date 18.11.2003
Publication Kind C
IPC
G08B 13/194
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
18Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
189using passive radiation detection systems
194using image scanning and comparing systems
G06T 1/00
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
1General purpose image data processing
G06T 7/00
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
7Image analysis
CPC
G06K 9/00778
GPHYSICS
06COMPUTING; CALCULATING; COUNTING
KRECOGNITION OF DATA; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
9Methods or arrangements for reading or recognising printed or written characters or for recognising patterns, e.g. fingerprints
00624Recognising scenes, i.e. recognition of a whole field of perception; recognising scene-specific objects
00771Recognising scenes under surveillance, e.g. with Markovian modelling of scene activity
00778Recognition or static of dynamic crowd images, e.g. recognition of crowd congestion
G08B 13/19602
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
189using passive radiation detection systems
194using image scanning and comparing systems
196using television cameras
19602Image analysis to detect motion of the intruder, e.g. by frame subtraction
G08B 13/19608
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
189using passive radiation detection systems
194using image scanning and comparing systems
196using television cameras
19602Image analysis to detect motion of the intruder, e.g. by frame subtraction
19608Tracking movement of a target, e.g. by detecting an object predefined as a target, using target direction and or velocity to predict its new position
G08B 13/19673
GPHYSICS
08SIGNALLING
BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
13Burglar, theft or intruder alarms
18Actuation by interference with heat, light or radiation of shorter wavelength; Actuation by intruding sources of heat, light or radiation of shorter wavelength
189using passive radiation detection systems
194using image scanning and comparing systems
196using television cameras
19665Details related to the storage of video surveillance data
19671Addition of non-video data, i.e. metadata, to video stream
19673Addition of time stamp, i.e. time metadata, to video stream
Applicants ELECTRONIC DATA SYSTEMS CORPORATION
Priority Data 9119588.3 12.09.1991 GB
Title
(EN) IMAGE ANALYSER
(FR) ANALYSEUR D'IMAGES
Abstract
(EN)


In a method and apparatus for analysing an electronic
image signal, the signal is treated as representing one or
more cells each comprising a plurality of pixels. A set of
pointers is generated and sequentially set according to
characteristic values related to detailed image content. The
pointers are used to address a memory array and for
successive frames, the values of an address in each array row
indicated by the pointer corresponding to that row is
updated. In this way, for each frame the characteristic
values can be accumulated so that in a single operational
mode, both a time history of the image, stored in a memory,
is updated and an indication is produced indicative of the
occurrence or non-occurrence of an event not associated with
image background. The characteristic values can be generated
by randomly or pseudo-randomly selecting pairs of pixels and
for each, generating a binary signal depending on whether or
not the intensity of incident light on a predetermined one of
the pair is greater than the intensity on the other. Over
all the rows, the values in the addresses being updated can
be summed, as well as the maximum value in each row. The
ratio of the two sums can be time weighted averaged with
respect to the ratios obtained from previous frames. The
ratio is compared with the average and the result used to
determine the occurrence or non-occurrence of a significant
event within the image.