Abstract: An image output by a camera can contain a fault such that the signal output by the camera is not constant for a uniform background. To correct this fault, the method involves memorizing, as a correction image, a destructured image of the scene to be observed; this destructured image is generated by calculating the means of the signals obtained when the selected scene is observed while the camera settings are simultaneously modified inconsistently; the correction image is then subtracted from the image formed by the signals output by the detector during real observation of the scene selected with correct camera settings. Application to all scanning cameras.

Abstract: Camera having means for the automatic regulation of the sensitivity of a charge transfer detector functioning by vertical frame transfer. These means comprise a loop for controlling the video signal by varying the integration time of electrons in the image area of the CTD sensor, as well as an optical attenuating device for chopping said area during each period of transferring the collected charges into the store. The attenuator has at least one fixed disk and one movable disk controlled in rotation, the disks carrying optical densities or being made of polarizers.

Abstract: A phase-controlled pulse signal generator, comprising a magnetic field source born by a rotating shaft, and a Hall effect sensor submitted to the field, the sinusoidal signal delivered being processed by a phase correcting circuit controlled by the speed of the shaft, followed by a triggered pulse circuit.

Abstract: A system for the synhchrotransmission of angular position data between two rotating shafts, using, as the transmitter and receiver, two two-phase Hall effect motors, of which each rotor 2, 52 has a permanent magnet and each stator is formed by two windings 54,54, 73,74, and two Hall effect magnetic sensors 3,4, 23,24, arranged in pairs at a right angle. The electrical signals created by the sensors of the transmitter and the receiver are introduced into comparator circuits 19,29 so as to produce, in the event of angular position differences between the rotors, an error signal which after amplification 40, 41 is applied to the windings 53,54 of the receiver, thus eliminating the position difference by the creation of a torque.