Method for compensating for geometric noise in a video sequence of infrared images based on an analysis of the observed scene Russian patent published in 2021 - IPC G06T5/50 H04N5/357 G06K9/40 

FIELD: digital image processing.

SUBSTANCE: invention relates to the field of digital image processing and relates to a method of compensating for geometric noise of infrared images from sensors with vertical arrays of photosensitive elements. A method is proposed, in which a frame is received from an infrared camera and a geometric noise estimate is subtracted from it. This estimate is formed as a result of recurrent averaging of the pixel brightness of previously received frames. In each received frame, the lines are randomly rearranged; the variance of the brightness gradient of the auxiliary frame in the direction of the lines is estimated and compared with its previous maximum value. If this value is exceeded, the auxiliary frame is written to memory, divided into low-frequency and high-frequency components, the high-frequency component is stored in memory, and subtracted from the current frame. If the value is not exceeded, the previously stored high-frequency component is subtracted from the current frame. In this case, the auxiliary frame is formed by recurrent averaging of previously received frames with randomly rearranged lines only until their number exceeds the threshold value of N_threshold. Further, the auxiliary frame is formed according to the equation of the complementary filter with a fixed weight of each new received frame equal to 1/N_threshold.

EFFECT: technical result is the formation of an auxiliary calibration frame, which adaptively changes when the dark current of the matrix receiver of infrared cameras changes.

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