Image processing apparatus
First Claim
1. An image processing apparatus comprising:
- an effective pixel portion that accumulates an amount of first electric charge corresponding to an intensity of incident light from a subject;
a shaded pixel portion that accumulates an amount of second electric charge, where the incident light is shaded from the subject;
a QV conversion part or parts operative to convert said first and second electric charges into analog signals, respectively;
a signal processing section that processes said analog signals to generate an analog output signal;
an A/D conversion section that converts said analog output signal into a digital output signal;
a noise determination section that determines a noise level from said digital output signal;
a brightness measuring section that measures brightness information in a predetermined region of said subject from said digital output signal based on said first electric charge;
a target value setting section that sets a black level target value for said analog output signal or said digital output signal based on said noise level and said brightness information; and
a black level setting section that sets a black level for said analog output signal or said digital output signal based on said black level target value;
wherein said analog output signal or said digital output signal is corrected based on said black level.
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Accused Products
Abstract
An image processing apparatus includes a QV converter that converts an electric charge accumulated in an effective pixel portion into an analog video signal and also converts an electric charge of a shaded pixel portion into an analog shaded signal, a signal processing section that processes output signals of the QV converter, a black level setting section that sets a black level from a black level target value, an A/D conversion section that A/D converts an analog output signal of the signal processing section after correction thereof by the black level, a CPU that processes a digital output signal D from the A/D conversion section, a noise determination section that determines a noise level from the digital output signal, a brightness measuring section that measures brightness information of a predetermined region, and a target value setting section that sets the black level target value based on the noise level and the brightness information.
9 Citations
11 Claims
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1. An image processing apparatus comprising:
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an effective pixel portion that accumulates an amount of first electric charge corresponding to an intensity of incident light from a subject; a shaded pixel portion that accumulates an amount of second electric charge, where the incident light is shaded from the subject; a QV conversion part or parts operative to convert said first and second electric charges into analog signals, respectively; a signal processing section that processes said analog signals to generate an analog output signal; an A/D conversion section that converts said analog output signal into a digital output signal; a noise determination section that determines a noise level from said digital output signal; a brightness measuring section that measures brightness information in a predetermined region of said subject from said digital output signal based on said first electric charge; a target value setting section that sets a black level target value for said analog output signal or said digital output signal based on said noise level and said brightness information; and a black level setting section that sets a black level for said analog output signal or said digital output signal based on said black level target value; wherein said analog output signal or said digital output signal is corrected based on said black level. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification