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1. WO2020197494 - PLACE RECOGNITION

Publication Number WO/2020/197494
Publication Date 01.10.2020
International Application No. PCT/SG2020/050158
International Filing Date 24.03.2020
IPC
G06T 7/33 2017.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
7Image analysis
30Determination of transform parameters for the alignment of images, i.e. image registration
33using feature-based methods
G06K 9/62 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR 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
62Methods or arrangements for recognition using electronic means
G06K 9/46 2006.01
GPHYSICS
06COMPUTING; CALCULATING OR 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
36Image preprocessing, i.e. processing the image information without deciding about the identity of the image
46Extraction of features or characteristics of the image
G06F 16/532 2019.01
GPHYSICS
06COMPUTING; CALCULATING OR COUNTING
FELECTRIC DIGITAL DATA PROCESSING
16Information retrieval; Database structures therefor; File system structures therefor
50of still image data
53Querying
532Query formulation, e.g. graphical querying
Applicants
  • AGENCY FOR SCIENCE, TECHNOLOGY AND RESEARCH [SG]/[SG]
Inventors
  • YUAN, Miaolong
  • LI, Zhengguo
  • GAO, Wenchao
  • WAN, Kong Wah
  • YAU, Wei Yun
Agents
  • POH, Chee Kian Daniel
Priority Data
10201902701U26.03.2019SG
10201902800S28.03.2019SG
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) PLACE RECOGNITION
(FR) RECONNAISSANCE DE LIEU
Abstract
(EN)
A method of determining which of a plurality of reference images has lighting conditions which most closely matches those of a query image, the method comprising, for each reference image: determining a set of matches between the reference image and the query image, wherein a match comprises a first feature in the query image and a second feature in the reference image, wherein the first and second features are both projections of the same point in three-dimensional space; and calculating a Zero-Normalized Cross Correlation for the determined set of matches, wherein the reference image corresponding to the set of matches having the highest value of Zero- Normalized Cross Correlation is determined to be the reference image with lighting conditions which most closely match those of the query image.
(FR)
L'invention concerne un procédé permettant de déterminer quelle image d'une pluralité d'images de référence comprend des conditions d'éclairage qui correspondent le mieux à celles d'une image d'interrogation, ledit procédé consistant pour chaque image de référence à : déterminer un ensemble de correspondances entre l'image de référence et l'image d'interrogation, une correspondance comprenant une première caractéristique dans l'image d'interrogation et une seconde caractéristique dans l'image de référence, les première et seconde caractéristiques étant toutes deux des projections du même point dans un espace tridimensionnel; et calculer une corrélation croisée normalisée à zéro pour l'ensemble déterminé de correspondances, l'image de référence correspondant à l'ensemble de correspondances ayant la valeur la plus élevée de corrélation croisée normalisée à zéro étant déterminée comme l'image de référence avec des conditions d'éclairage qui correspondent le mieux à celles de l'image d'interrogation.
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