The infrared focal plane circuit can not only convert the thermal radiation into weak electrical signals,but also has a readout circuit.It can cooperate with the infrared focal plane detector to achieve pixel level analog digital conversion,intellgent image processing,digital output and other functions.The acquired array signal is processed at the pixel level and then output.This paper proposes several intelligent image algorithms based on single pixel level ADC, such as background subtraction,blind pixel compensation,nonuniformity correction,windowing,pixel merging,spatial filtering,histogram equalization,and time delay integration,which avoid the way of performing at the algorithm level, reduce the difficulty of implementing subsequent image processing algorithms,and reduce the resources consumed by image processing algorithms.In this paper,a liquid nitrogen imaging system based on infrared focal plane array circuit is proposed.Through testing an intelligent infrared focal plane circuit with 640×512 array,the multifunctional image algorithm of a single infrared focal plane is verified,and the full parameter performance evaluation of the infrared focal plane circuit is conducted,providing a new technical approach for the engineering application of intelligent algorithm of infrared focal plane.