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1. WO1993005488 - IMAGE ANALYSER

Publication Number WO/1993/005488
Publication Date 18.03.1993
International Application No. PCT/GB1992/001669
International Filing Date 11.09.1992
Chapter 2 Demand Filed 08.04.1993
IPC
G08B 13/194 2006.01
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
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 [US]/[US] (AllExceptUS)
  • ABBOTT, James, Philip [GB]/[GB] (UsOnly)
  • GENT, Christopher, Robert [GB]/[GB] (UsOnly)
  • THOMAS, William, Genydd [GB]/[GB] (UsOnly)
  • SERMON, Gerald, David [GB]/[GB] (UsOnly)
  • STUBBINGTON, Brian, David [GB]/[GB] (UsOnly)
Inventors
  • ABBOTT, James, Philip
  • GENT, Christopher, Robert
  • THOMAS, William, Genydd
  • SERMON, Gerald, David
  • STUBBINGTON, Brian, David
Agents
  • WALDREN, Robin, Michael
Priority Data
9119588.312.09.1991GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
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 value 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.
(FR)
Dans un procédé et un appareil d'analyse d'un signal d'images électronique, le signal est traité comme représentant une ou plusieurs cellules, chacune comprenant une pluralité de pixels. Un ensemble de pointeurs est généré et constitué de manière séquentielle selon des valeurs caractéristiques relatives au contenu détaillé des images. Les pointeurs sont utilisés pour adresser une mémoire, et à chaque trame successive, la valeur d'une adresse dans chaque ligne de mémoire indiquée par le pointeur correspondant à cette ligne est actualisée. De cette façon, pour chaque trame, les valeurs caractéristiques peuvent être accumulées de sorte que, dans un mode opérationnel unique, on met à jour un historique d'image, mise en mémoire, et on produit une indication relative à l'occurence ou la non-occurence d'un événement non associé à l'arrière-plan de l'image. On peut générer des valeurs caractéristiques en sélectionnant des paires de pixels aléatoirement ou pseudo-aléatoirement, et pour chacune de ces paires, en générant un signal binaire selon que l'intensité de la lumière incidente sur une paire prédéterminée est supérieure ou non à l'intensité de la lumière incidente sur l'autre paire. Sur toutes les lignes, les valeurs des adresses actualisées peuvent être additionnées, ainsi que la valeur maximum dans chaque ligne. On calcule la moyenne du rapport des deux sommes par pondération temporelle en fonction des rapports obtenus des trames précédentes. On compare ce rapport avec la moyenne et on utilise le résultat pour déterminer l'occurence ou la non-occurence d'un événement significatif de l'image.
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