Image-type fire detection and alarming method

The invention relates to the technical field of fire detection and alarming, and particularly relates to an image-type fire detection and alarming method. The method comprises the following steps: a camera is used to obtain a visible image without intervention of an infrared filter and an infrared image with intervention of the infrared filter as reference images; the visible image is analyzed, and potential fire areas are regarded as suspicious areas; when a suspicious area appears, switching to intervention of the infrared filter is carried out, and an infrared image is acquired; further confirmation is carried out through analysis on the infrared image in the suspicious area, and whether the analysis result of the infrared image in the suspicious area meets a fire alarming threshold condition is judged; and if yes, a fire alarming state is entered, or otherwise, analysis on the visible image is continued. The visible image and the infrared image are strictly matched in a visual field, the cost, the calcula