METHOD OF COMPENSATING FOR DEFECTIVE PHOTOSENSITIVE ELEMENTS OF MULTIELEMENT PHOTODETECTOR Russian patent published in 2011 - IPC H04N5/335 H04N1/409 

FIELD: information technology.

SUBSTANCE: signal from a defective element is replaced with a signal from a robust element lying on the left side. All defective elements lying in the row, including those lying consecutively, are replaced. Median filtration is applied to the obtained image, where filtration is applied to those elements for which the difference in signal value of the element and the filter median is greater than a threshold value. Said elements are assigned the corresponding median value. The filter is applied for the section of the image based on the threshold tied to the average noise value of the photodetector. The threshold is compared with the difference between the signal value of the central element of the filter mask and the filter median value. The filter threshold selected is proportional to the average noise value of the photodetector and median filtration is carried out with element mask size of (2k+1)×(2k+1), where k is an integer and k≥1, specifically a 3×3 element.

EFFECT: low hardware expenses on compensating for defective photosensitive elements, high quality of thermal image, high reliability of compensating for a defective element independent of contrast of the viewed scene and independence of quality of replacing defective elements from instability of the structure based on solid solution of cadmium or mercury tellurides.

8 cl, 5 dwg, 3 ex