Electronic camera which clamps image signal outputted ROM imager
View Patent ↗An electronic camera includes an imager. An imager outputs an image signal that is based on electric charges produced on an imaging surface having an optical black area. A clamper clamps the image signal outputted from the imager by referring to a signal level of the optical black area. A processor processes the image signal outputted from the clamper by referring to a parameter setting. A restrictor restricts behavior of the clamper corresponding to a specific area allocated to the optical black area. An adjustor adjusts the parameter setting based on an output of the clamper corresponding to the restricting process of the restrictor.
1. An electronic camera, comprising:
an imager which outputs an image signal that is based on electric charges produced on an imaging surface having an optical black area;
a clamper which clamps the image signal outputted from said imager by referring to a signal level of the optical black area;
a reducer which reduces a noise superposed the image signal outputted from said clamper by referring to a reference pattern;
a restrictor which restricts behavior of said clamper corresponding to a specific area allocated to the optical black area; and
an adjustor which adjusts the a gain of the reference pattern based on an output of said clamper corresponding to the restricting process of said restrictor.
2. An electronic camera according to claim 1 , further comprising a power-source controller which turns off a power source when an output level of said clamper corresponding to the restricting process of said restrictor is equal to or more than a predetermined value.
3. An electronic camera according to claim 1 , wherein said restrictor includes a selector which selects one of an image signal that is not yet clamped and a previously clamped image signal, and a selection controller which controls the selection behavior of said selector.
4. An electronic camera, comprising:
an imager which outputs an image signal that is based on electric charges produced on an imaging surface having an optical black area;
a clamper which clamps the image signal outputted from said imager by referring to a signal level of the optical black area;
a reducer which reduces a noise superposed on the image signal outputted from said clamper by referring to a reference pattern; and
an adjustor which adjusts the a gain of the reference pattern based on partial image signal corresponding to the optical black area and being not yet clamped by said clamper.
5. An electronic camera according to claim 4 , wherein said adjuster includes an acquirer which acquires an image signal that is not yet clamped by said clamper, corresponding to the optical black area, and an adjusting processor which executes a gain adjusting process based on the image signal acquired by said acquirer.