A method, device and system for determining the presence of...

G - Physics – 01 – M

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G01M 3/04 (2006.01)

Patent

CA 2720633

A video based method to detect volatile organic compounds (VOC) leaking out of components used in chemical processes in petrochemical refineries. Leaking VOC plume from a damaged component causes edges present in image frames to loose their sharpness, leading to a decrease in the high frequency content of the image. Analysis of image sequence frequency data from visible and infrared cameras enable detection of VOC plumes in real-time. Analysis techniques using adaptive background subtraction, sub-band analysis, threshold adaptation, and Markov modeling are described.

La présente invention concerne un procédé lié au domaine de la vidéo, adapté pour détecter des composés organiques volatils (VOC) s'échappant de composants utilisés dans des processus chimiques au sein de raffineries pétrochimiques. Un panache de VOC s'échappant d'un composant endommagé amène des bords présents dans des images à perdre de leur netteté, ce qui provoque une diminution du contenu de fréquence élevé de l'image. Une analyse de données de fréquence d'une séquence d'images obtenues à partir de caméras infrarouges et opérant dans la plage de lumière visible permet de détecter des panaches de VOC en temps réel. La présente invention concerne également des techniques d'analyse utilisant la soustraction d'arrière-plan adaptative, l'analyse de sous-bande, ladaptation de seuil, et le modelage de Markov.

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