A smoke alarm method

Abstract

This invention relates to the field of smoke alarms, specifically to a smoke alarm method, comprising the steps of laser irradiation and image acquisition, image processing, feature extraction, light beam recognition path determination, and diffusion recognition path determination to identify smoke concentration and trigger an alarm. The laser irradiates the detection area, and the image acquisition device captures images of the laser light path. An active laser light source is used to actively create a visible reference light path in low-light or no-light environments, thereby overcoming the problems of insufficient ambient light and reduced recognition accuracy caused by insufficient ambient light in traditional image recognition methods under low-light conditions. Smoke characteristics are captured in three dimensions—shape, region, and dynamics—through linearity, white pixel ratio, and white pixel ratio change. Dual-path determination is performed: the integrity of the laser light beam is used to determine low-concentration smoke, and the diffusion of the laser light path is used to determine high-concentration smoke, ensuring reliability across the entire concentration range.

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