Early warning method and device based on people flow condition in key area and application

The invention provides an early warning method and device based on the flow condition of people in a key area and application, and the method comprises the following steps: delimiting the key area, obtaining the detailed information of at least one person in the key area, converting the detailed information of the person into a person feature vector, and storing the person feature vector in a database; calculating data correlation among detailed information of different persons based on the person feature vectors; key area flow information in the key area at a first set moment is obtained, and a scene data matrix at the first set moment is obtained according to the key area flow information; and constructing an early warning data matrix of the key area at the first set moment according to the data correlation among the detailed information of different persons, comparing the early warning data matrix with the scene data matrix, and performing early warning according to a comparison result. According to the sc