Method for capturing a heat pattern

A method for capturing a heat pattern with a sensor comprising several pixels each including at least one heat-sensitive measuring element, the sensor further including at least one heating element capable of heating the heat-sensitive measuring element of each of said pixels during a measurement of the heat pattern by the heat-sensitive measuring element of said pixel, the method including for each of said pixels:

• a first step of heating the heat-sensitive measuring element of the pixel, in which a first amount of heating power is dissipated in the heat-sensitive measuring element of the pixel;
• a first step of measuring the heat pattern present on the pixel, including a first read-out of at least one temperature variable parameter of the heat-sensitive measuring element of the pixel after a first delay time;
• a second step of heating the heat-sensitive measuring element of the pixel, in which a second amount of heating power is dissipated in the heat-sensitive measuring element of the pixel;
• a second step of measuring the heat pattern present on the pixel, including a second read-out of the temperature variable parameter of the heat-sensitive measuring element of the pixel after a second delay time;
• in which the value of the first power is different from that of the second power and/or the value of the first delay time is different from that of the second delay time, and further comprising, after the second step of measuring the heat pattern present on each of the pixels, a step of digital processing of the first and second images of the heat pattern, corresponding respectively to all of the first measurements of the heat pattern and to all of the second measurements of the heat pattern, including at least one comparison and/or at least one linear combination of the first and second images.