METHOD FOR MEASURING COORDINATES OF IMAGE OF POINT LIGHT SOURCE Russian patent published in 1994 - IPC

FIELD: optical measuring. SUBSTANCE: method involves photoelectric conversion of image, video signal generation, calculation of image coordinates by addition of two video signal constituents, calculation of first constituent of coordinate by maximal value of video signal. In addition signal is modulated by photoelectric conversion with linear amplitude modulation. Then two video signals corresponding to ascending and descending amplitude modulation are generated. Maximal value of video signal is searched in array of added values of corresponding pixels from video signal. Second coordinate constituent is calculated according to equation , where Δx is second constituent of coordinate, Δh is value of inter-pixel step, h is pixels size along calculated coordinate, U_1i and U_2i are value of i-th signals for video signal with ascending and descending amplitude modulation correspondingly, i_max is index of maximal value of signal from array of added values of video signals. EFFECT: increased precision of measuring for images having small size. 1 dwg