Flame detection system and method

摘要

A hazard detection system measures a color and intensity of a portion of an image of a scene. The image is obtained using a known gain and/or exposure such that the image substantially lacks any saturation. A black body brightness temperature and the corresponding block body intensity are determined based on the measured color. A hazard condition, such the presence of a flame, can be detected using a comparison of the measured intensity and the computed intensity. The gain and/or exposure can be selected such that only the pixels of intensity greater than a certain threshold generally saturate in the captured image. Hazard conditions, such as smoke, can be detected using images in which selective saturation is permitted.

主权项

1. A method of detecting a hazard, the method comprising:
obtaining a first image of a scene; measuring color and intensity of at least a portion of the first image, using a value of at least one imaging parameter associated with the first image; computing a reference intensity related to the measured color; and comparing the measured intensity with the reference intensity to determine at least in part if the portion of the first image indicates a hazard condition by computing an emissivity factor as a ratio of the measured intensity to the reference intensity; and determining if the emissivity factor lies within a specified range corresponding to the hazard condition.