Digital electronic still-video camera and method of controlling

Details Digital electronic still-video camera and method of controlling Digital electronic still-video camera and method of controlling

1993-09-10

1995-07-25

Razavi, Michael T.

Television

Camera, system and detail

Still and motion modes of operation

348221, 348354, H04N 5225

Patent

active

054366569

ABSTRACT:
An analog/digital converting circuit necessary for recording processing is also used when exposure control is performed employing digital image data. A gamma corrector circuit 10 capable of being changed over between a gamma-correction characteristic and a linearly proportional characteristic in response to depression of a two-stage shutter release button is provided. When exposure control is carried out, changeover of the gamma-corrector circuit 10 is controlled in such a manner that the input/output characteristic of the circuit will be a linearly proportional characteristic. When exposure control is performed, a b terminal of a changeover switch 14 is connected to the A/D converting circuit 13 so that a photometric value is calculated using circuits 15, 16, and 17. When processing for recording image data is executed, changeover of the gamma-corrector circuit 10 is controlled is such a manner that the output signal thereof takes on the value of the input signal raised to the 0.45 power, and an a terminal of the changeover switch 14 connected to the A/D conversion circuit 13. The image data is recorded on a memory card 40 using circuits 31, 32, 33 and 34.

REFERENCES:
patent: 4969045 (1990-11-01), Haruki et al.
patent: 5008739 (1991-04-01), D'Luna et al.
patent: 5027214 (1991-06-01), Fujimori
patent: 5089890 (1992-02-01), Takayama
patent: 5091787 (1992-02-01), Watanabe et al.
patent: 5162914 (1992-11-01), Takahashi et al.

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