Infrared imaging detection and positioning method of underground building in plane surface environment

The invention discloses an infrared imaging detection and positioning method of an underground building in a plane surface environment. The method comprises a step of obtaining an original infrared image g0 formed after the formation modulation of an underground building and determining a local infrared image g of the general location of the underground building in the original infrared image g0, a step of setting an iteration termination condition and setting the initial value h0 of a Gauss thermal diffusion function, a step of taking the local infrared image g as an initial target image f0 and carrying out iterative solution of a thermal expansion function hn and a target image fn by using a maximum likelihood estimation algorithm according to the initial value h0 of the Gauss thermal diffusion function, and a step of judging whether the iteration termination condition is satisfied or not, if so, taking the target image fn obtained through the iterative solution as a final target image f, and if not, contin