Abstract: Calculating a gain setting for a primary image sensor includes receiving a test-matrix of pixels from a test image sensor, and receiving a first-frame matrix of pixels from a primary image sensor. A gain setting is calculated for the primary image sensor using the first-frame matrix of pixels except those pixels imaging one or more exclusion regions identified from the test matrix of pixels.

Abstract: An exchangeable connecting device between a video camera and an automatic iris lens in which one common connector (k) makes it possible to connect different kinds of lenses, and use any kind of a lens, L1 or L2 without first confirming the kind of lens to be used. In the video camera (M5) one of video control signals (1), amplified by the output of a light sensor is directly connected to an analogue switch (t), while the other is connected through a galvanometer control circuit (p) to the analogue switch (t) by common connector (k). When a video signal control type automatic iris lens (L1) is connected, a video control signal (1) amplified by the output of light sensor is directly connected to the analogue switch (t) and the common connector (k). When a DC control type automatic iris lens (L2) is connected, analogue switch (t) selects a video control signal (1) amplified by the galvanometer control circuit p.