Method for video surveillance of the crossing of a line by people, associated computer program and device

A non-transitory computer readable medium comprising a program including instructions for execution of a method for video surveillance of a crossing of a line by people, when said program is executed on a computer;

• wherein said method comprises
• for each image of a plurality of successive images of a video stream from a camera pointing towards the line, a search for at least one person present in the each image and a definition, for each person found of the at least one person present, of a zone in the each image, wherein said zone is a person zone, surrounding said each person found at least partially;
• for said each person found of at least one person found, a grouping together into one tracklet of several person zones from successive images and surrounding said each person found at least partially;
• for each tracklet:
• identification of the each person found in the tracklet from said several person zones in the tracklet;
• determination of a moment at which the line is crossed by the each person found that is identified from the several person zones in the tracklet,
• wherein the line comprises a fixed and predefined position in the successive images,
• wherein the line is divided into two parts comprising an upstream part and a downstream part,
• wherein said determination of the moment at which the line is crossed by the each person found comprises a determination of when the person zone of the each person found extends at least partly into the downstream part, such that all other person zones of the several person zones extend into the upstream part;
• and
• addition of a name found and of the moment of crossing determined in at least some of the successive images containing the several person zones in the tracklet.

A device for a video surveillance of a crossing of a line by people, comprising:

• means designed, for each image of a plurality of successive images of a video stream from a camera pointing towards the line, to search for at least one person present in the each image and to define, for each person found, a zone in the image surrounding said each person found at least partially, wherein said zone comprises a person zone;
• means designed, for said each person found of at least one person found, to group together into one tracklet several person zones from successive images and surrounding said each person found at least partially;
• means designed, for said tracklet, to identify the each person found in the tracklet from said several person zones in the tracklet;
• means designed, for tracklet, to determine a moment at which the line is crossed by the each person found that is identified from said several person zones in the tracklet,
• wherein the line comprises a fixed and predefined position in the successive images,
• wherein the line is divided into two parts comprising an upstream part and a downstream part,
• wherein said determine the moment at which the line is crossed by the each person found comprises a determination of when the person zone of the each person found extends at least partly into the downstream part, such that all other person zones of the several person zones extend into the upstream part;
• and
• means designed, for said tracklet, to add a name found and the moment at which the line is crossed determined in at least some of the successive images containing the several person zones in the tracklet.