Optoelectronic device for videofrequency scanning of images

Claim 1

An optoelectronic device for scanning videofrequency images comprising an optical element driven in such a manner as to produce an image scan, an optical element for focusing on a detection system comprising at least one array of detectors, and videofrequency means for processing detailed signals comprising in particular circuits for amplifying the respective detected signals and a correcting unit, wherein each amplifying circuit is connected to the corresponding detector by means of a direct-current coupling and said correcting unit is formed by a so-called occultation device having two states for producing a uniform flux on all the detectors during an initialization stage and in the first state instead of the reception flux corresponding to the videofrequency image and conversely in the second state, and a correction loop comprising: a storage memory for storing the values of the signals present at the output of said amplifying circuits when the occultation device is in the first state; a first circuit for subtracting respectively said stored values from those present at the output of the respective amplifying circuits in order to compensate for the drift aforesaid; a measuring circuit for producing the mean value of the amplified videofrequency signals; a second circuit for subtracting said mean value from the signal of each detector.