DEVICE FOR DETECTING THERMAL OBJECTS ON BACKGROUND OF CELESTIAL HEMISPHERE Russian patent published in 2010 - IPC G01S3/78 G02B23/12 

FIELD: physics.

SUBSTANCE: in the method, a target image is focused on a radiation receiver, amplitude of the picked up signal is converted to a digital code and stored in form of a two-dimensional array U_N,M=||u_n,m||, where N is number of rows and M is number of columns of the array. The element of the array un,m is proportional to brightness of background radiation picked up from the cell of the receiver in the n-th row and m-th column. The modulus of the threshold value for the decision making interval is determined. The array U_N,M is transformed into an array E_n,m with elements e_n,m and an array is formed: if e_n,m lies in the interval [-p, p]> then =0 s and if e_n,m lies outside the interval [- p, p], then =1. The rectangular monitor screen is divided into cells according to the number of rows and columns of the array . Cells =1 are allocated colour having the highest contrast relative the background monitor screen, and considered marks from point thermal objects.

EFFECT: improved method owing to automatic and adaptive accounting for the level of radiance and spatial dimensions of radiation of a small thermal object and cold extended atmospheric background.

4 dwg, 12 tbl