Gas leak detection device and detecting method

A gas leak detection device, comprising:

• a remote temperature sensor, configured to detect an area-to-be-monitored to obtain a plurality of thermal images, wherein each pixel position in the thermal images comprises a corresponding temperature value;
• and
• a processor, coupled to the remote temperature sensor,
• wherein the processor is configured to:
• obtain the thermal images from the remote temperature sensor,
• calculate a detected temperature value of each environmental block according to each of a plurality of environmental blocks in each thermal image,
• calculate a temperature judgment threshold based on the detected temperature value of each environmental block in a detection time period,
• determine whether a temperature of at least one region-of-interest is abnormal based on the temperature judgment threshold, and
• perform a warning operation when the temperature of the at least one region-of-interest is abnormal,
• wherein the processor is configured to calculate the temperature judgment threshold only when the plurality of thermal images includes at least N batches of data, wherein N is a positive integer,
• wherein the processor is configured to dynamically generate and calculate the temperature judgment threshold using only M batches of data of the thermal image sequentially obtained up to a current calculation time, wherein M is a positive integer, and M is greater than N.