FIELD: television technology.
SUBSTANCE: invention relates to television technology and can mainly be used in systems for analyzing interferograms, in which digital "ring" photodetectors made using the technology of complementary structures "metal-oxide-semiconductor" (CMOS) are used as video signal sensors. The effect is achieved by forcibly implementing in the photodetector the accumulation of information charges and the formation in adjacent frames of image signals of different levels with the magnitude of the video signal span, respectively, "maximum" and "reduced". Wherein as an adjustable parameter of the degree of recursive filtering in a television camera, the gain factor in the delayed frame Km for its active pixel is used, the value of which varies within: 
, where 
is the maximum allowable value of the gain.
EFFECT: increasing the accuracy of the implementation of recursive filtering by increasing the sensitivity of the television camera.
1 cl, 6 dwg, 2 tbl
