Imaging apparatus having a solid state matrix-type imaging eleme

Details Imaging apparatus having a solid state matrix-type imaging eleme Imaging apparatus having a solid state matrix-type imaging eleme

1993-05-03

1995-07-25

Groody, James J.

Television

Camera, system and detail

Solid-state image sensor

348294, 348302, 348281, 348282, H04N 5335, H04N 314

Patent

active

054366623

ABSTRACT:
In an imaging apparatus capable of expanding a dynamic range image signals of different levels are read simultaneously from a solid-state element whose light-receiving surface is divided. Read 1/2 frame image signals are switched by a changeover switch circuit at intervals of a 1/2 frame time. One of two image signals of different levels supplied from the two outputs of the changeover switch circuit is delayed at a delay circuit. Further, those image signals are separated into r, g, and b components, and then undergo logarithmic conversion into image signals of multiple desired levels. The signals are digitized at an A/D converter and undergo operations at an adder, which adds while keeping their logarithmic characteristic, and at an inverse logarithmic converter. A luminance signal is obtained at a matrix circuit, and is converted into a logarithm at a logarithmic circuit. The lighting irregularity components of the resulting signal are suppressed. This signal is compressed, and the compressed signal is subtracted at a subtracter to obtain a compression coefficient, which is added to the digitized image signal from the A/D converter. Image signals of a wide dynamic range corrected at the inverse logarithmic converter are obtained for a single image at a TV rate on a real-time basis. Further, the control of exposure to the entire image and the expansion of the dynamic range are possible.

REFERENCES:
patent: 4459619 (1984-07-01), Yoshida
patent: 4975778 (1990-12-01), Park
patent: 5040070 (1991-08-01), Higashitsutsumi et al.

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