Schneider Electric has filed a patent for a method to determine the position of a person in a building using a thermal imager with a wide-angle lens. The method involves acquiring a deformed thermal image of the scene, extracting the person’s region of interest, determining its position using polar coordinates, and applying a wide-angle correction function to obtain the actual position. GlobalData’s report on Schneider Electric gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Method for obtaining person's position using thermal imaging with wide-angle lens
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A recently filed patent (Publication Number: US20230314227A1) describes a method for obtaining the position of a person in a building using a thermal imager with a wide-angle lens. The method involves acquiring a deformed thermal image of the scene, extracting the region of interest corresponding to the person, determining the position of the region of interest using polar coordinates, and obtaining the actual position of the person by applying a wide-angle correction function to compensate for the lens distortion.
The wide-angle correction function used in the method includes a normalization factor and a metric factor. The normalization factor normalizes the distance coordinate of the region of interest, while the metric factor takes into account the field angle of the wide-angle lens and the height of the thermal imager installation in the building. The wide-angle correction function also includes an angular correction factor that is dependent on the angle coordinate. The angular correction factor follows a sawtooth-shaped distribution with a maximum value associated with specific angle values.
The patent also describes a thermal imager with a wide-angle lens that is configured to implement the method. The lens used in the thermal imager can be a fisheye lens, and the imager may include a long-wave-infrared imaging sensor for acquiring the thermal images.
Additionally, the patent mentions a home automation sensor that includes the thermal imager described in the patent.
Overall, this patent presents a method for accurately determining the position of a person in a building using a thermal imager with a wide-angle lens. The method involves extracting the region of interest from a deformed thermal image, determining the position using polar coordinates, and applying a wide-angle correction function to compensate for lens distortion. The patent also describes a thermal imager and a home automation sensor that incorporate this method.
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GlobalData Patent Analytics tracks bibliographic data, legal events data, point in time patent ownerships, and backward and forward citations from global patenting offices. Textual analysis and official patent classifications are used to group patents into key thematic areas and link them to specific companies across the world’s largest industries.
