Focusing aid for a manually focused video camera

Details Focusing aid for a manually focused video camera Focusing aid for a manually focused video camera

1986-03-25

1987-04-21

Rubinson, Gene Z.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358227, H04N 5232, H04N 530

Patent

active

046600922

ABSTRACT:
A focusing aid for a video camera alleviates manual focusing uncertainty due to difficulty in rendering sharply defined features in an electronic viewfinder. The focusing aid impacts a central viewing area by modifying the picture contrast, a visual substitute for a bandwidth-limited rendition of picture sharpness. A high frequency component of a luminance signal generated by the camera is converted into a dc control signal having an amplitude that varies with high frequency content. By using the control signal to adjust the gain applied to the luminance signal, the contrast of the picture formed in the central area is accentuated according to the degree of focus.

REFERENCES:
patent: 4282548 (1981-08-01), Plummer
patent: 4317135 (1982-02-01), Pitruzzello
patent: 4463384 (1984-07-01), Fujikawa et al.
patent: 4481540 (1984-11-01), Bergen
patent: 4484225 (1984-11-01), Bishop
patent: 4586090 (1986-04-01), Wilman et al.
patent: 4589031 (1986-05-01), Tsuji
patent: 4599653 (1986-07-01), Kimura et al.

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