Method and system of two-point correction based on temperature substitution

A system of two-point correction based on temperature substitution, comprising:

• a temperature acquisition module, used for acquiring a lens temperature for an infrared thermal camera in a thermal equilibrium state;
• a first collection module of gray value, used for acquiring a gray value of a first black body arranged in front of a lens of the infrared thermal camera, a temperature of the first black body being equal to the lens temperature;
• a second collection module of gray value, used for acquiring a gray value of a baffle, the baffle being arranged between the lens of the infrared thermal camera and a detector of the infrared thermal camera;
• a first correction module, used for correcting the gray value of the first black body according to a first two-point correction parameter to obtain a corrected first uniform gray value, and for correcting the gray value of the baffle according to the first two-point correction parameter to obtain a corrected second uniform gray value;
• a first parameter collection module, used for acquiring a first correction parameter according to the gray value of the first black body, the corrected first uniform gray value, the gray value of the baffle and the corrected second uniform gray value;
• a third gray value collection module, used for acquiring a gray value of a second black body arranged in front of the lens of the infrared thermal camera, wherein a value by which a temperature of the second black body is higher than the lens temperature is a pre-set temperature value;
• a second correction module, used for correcting the gray value of the second black body according to a second two-point correction parameter to obtain a corrected third uniform gray value;
• a second parameter collection module, used for acquiring a second correction parameter according to the gray value of the first black body, the corrected first uniform gray value, the gray value of the second black body, and the corrected third uniform gray value;
• and
• a calculation module, used for correcting a gray value to be corrected according to the first correction parameter, the second correction parameter, the corrected first uniform gray value and the corrected second uniform gray value to obtain a corrected gray value.