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| Flexible frame fastening system for kites |
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| Clutch releasing and braking mechanism for fishing reel |
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Video signal mixer circuit for high-resolution imaging with solid-state matrix sensor cameras
| Details |
Inventors: Gillet, Claude; Voisin, Gerard; Bruyeres-Inza, Jean-Francois;
Assignee: Thomson-CSF (Paris, FR)
Primary Examiner: Ng; Jin F.
Assistant Examiner: Brinich; Stephen
Attorney, Agent or Firm: Cushman, Darby & Cushman
The circuit disclosed can be used to process synchronous video signals, especially those coming from two standard CCD sensors. It comprises two channels connected at the output to the two inputs, respectively, of an adder circuit which gives the mixed video signal. The first channel comprises a subtractor circuit which receives the two video signals, a high-frequency filter circuit to eliminate the low-frequency spectrum ranging between 0 and a determined limit frequency, an amplifier circuit to balance the gain of the two channels and a fast change-over/sampler circuit connected to the first input of the adder during half of each dot cycle, while the second input of the adder continually receives one of the video signals. The mixed signal thus comprises an unchanged low-frequency component which eliminates faults in the sensors related to non-homogeneity. The high-frequency component recovered corresponds to the first signal during the first half of the dot cycle and to the second signal during the second half of the dot cycle. |
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DETAILED DESCRIPTION According to the invention, it is proposed to make a video mixer circuit receiving a first video signal and a second video signal, the latter signal corresponding substantially to the first signal displaced by half a dot in the line-scanning direction, the mixer comprising a change-over/sampler circuit to multiplex the video signals by successively sampling one signal and then the other at the scanning dot rate, the said circuit comprising at least two channels respectively connected to the two inputs of an adder circuit, a first channel comprising the following series-connected elements: a subtractor circuit which receives the first signal and the second signal, a high-frequency filter circuit to eliminate the low-frequency spectrum ranging between 0 and a pre-determined frequency of the difference of the video signals, and the said sampler connected by its output to a first output of the said adder circuit, the second channel transmitting at least one of the signals to the second input of the said adder, so that the mixed signal delivered at the output comprises a high-frequency part corresponding to the first signal during each half cycle and to the second signal during each second half of this cycle and a low-frequency part which is unchanged.
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