Detection method and system

The invention provides a detection method and system. The detection method and system are used for detecting whether people exist in a vehicle. The detection method includes the following steps that: an infrared thermal imager is utilized to scan a space in the vehicle so as to obtain the infrared thermograms of objects in the vehicle, the infrared thermal imager begins scanning the space in the vehicle after a flameout and door locking preset time period of the vehicle; and contrastive analysis is performed on the infrared thermograms of the objects in the vehicle and pre-stored initial infrared thermograms which are obtained when no one in the vehicle, so that whether the infrared thermograms of the objects in the vehicle contain image areas of preset temperature can be judged, if the infrared thermograms of the objects in the vehicle contain the image areas of preset temperature, it is judged that someone is in the vehicle, and at the same time, alarm information containing alarm prompting characters and the obtained infrared thermograms of the objects in the vehicle is transmitted to a hand-held terminal of the owner of the vehicle, if the infrared thermograms of the objects in the vehicle do not contain the image areas of preset temperature, it is judged that no one exists in the vehicle. With the detection method and system adopted, children can be prevented from being left in the vehicle due to forgetting, and suffocation risks of the children who are trapped in the vehicle can be eliminated. The detection method and system of the invention have the advantages of simplicity, high efficiency, high universality and practicability.