Door opening early warning method and device based on cloud server

The invention relates to a door opening early warning method and device based on a cloud server. The method comprises the following steps that a video code stream of a vehicle-mounted camera is obtained; the video code stream is uploaded to a cloud server; the cloud server decodes the video code stream to obtain an original fisheye image; distortion correction is carried out on the fisheye image, the distorted fisheye image flows to a cloud server, and the cloud server extracts a moving target from the fisheye image; the cloud server detects the moving target; the cloud server tracks the detected moving target and obtains a moving target track; the cloud server analyzes the moving target track in the calibrated region of interest, and performs stepped alarm on the detected target track speed; and the alarm information is sent back to the vehicle-mounted host in real time, so that the vehicle-mounted host can control the alarm information. The vehicle door opening early warning function can be achieved, compar