A/D converting apparatus and image sensing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsTeruo Hieda, Kousuke Nobuoka
Life of this patent
Estimating the term…
Abstract
A low-cost A/D converting apparatus having a high precision includes a first A/D converter to which an analog input signal is applied as an input, a plurality of D/A converters to which an output from the first A/D converter is applied as an input, a subtractor for subtracting at least one output of outputs of the plurality of D/A converters from the analog input signal, and a second A/D converter, to which an output from the subtractor is applied as an input, having a resolution higher than a resolution of the first A/D converter.
Claims6
An image sensing apparatus comprising:
- an image sensing element for converting an optical image into an electric image pick-up signal and outputting the image pick-up signal;
- an A/D converter for converting the image pick-up signal outputted by said image sensing element into a digital signal;
- level detecting means for detecting a level of the image pick-up signal outputted by said A/D converter;
- adjusting an means for adjusting amount of light incident upon said image sensing element in dependence upon the level detected by said level detecting means;
- .gamma.-knee converting means having a plurality of conversion characteristics for applying non-linear processing to the image pick-up signal outputted by said image sensing element;
- and
- selecting at least means for selecting one of the plurality of .gamma.-knee characteristics in dependence upon the output signal level of said A/D converter.
An image sensing apparatus for converting an optically formed image into an electric signal, comprising:
- means for generating a video signal, which has color information, from the photoelectrically-converted image pick-up signal;
- and
- means for subjecting the video signal having the color information to a non-linear conversion in which a light-emitting state of a picture tube is rendered appropriate in terms of vision, wherein the non-linear conversion is applied in such a manner that a color component representing the color red in the video signal having the color information is emphasized in comparison with other color components in the video signal as long as a brightness level lies within a prescribed range.
An image sensing apparatus comprising:
- an image sensing element for converting an optical image into an electric image pick-up signal and outputting the image pick-up signal;
- an A/D converter for converting the image pick-up signal outputted by said image sensing element into a digital signal;
- level detecting means for detecting a level of the image pick-up signal outputted by said A/D converter;
- adjusting means for adjusting an amount of light incident upon said image sensing element in dependence upon the level detected by said level detecting means;
- non-linear converting means having a plurality of conversion characteristics for applying non-linear processing to the image pick-up signal outputted by said image sensing element;
- and
- selecting means for selecting at least one of the plurality of non-linear characteristics in dependence upon the output signal level of said A/D converter.
Dependencies are inferred from the claim text.