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US 8,411,163 B2Granted
Auto exposure controlling device and method
AssigneeLG Innotek Co., Ltd.
InventorSang Yong Lee
Life of this patent
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Abstract
An automatic exposure (AE) controlling device and method are provided. According to the method, an electric shutter (ES) value and an analog gain control (AGC) value can be calculated through a proportional integral control method according to a brightness value of an inputted image frame. Then, AE compensation on a present image frame can be performed using the calculated ES value and AGC value.
Claims24
An automatic exposure (AE) controlling method, comprising:
- calculating, via a controller, an electric shutter (ES) value through a proportional integral control method;
- calculating, via the controller, an analog gain control (AGC) value through the proportional integral control method;
- and
- performing, via the controller, AE compensation on a present image frame using the calculated ES value and the calculated AGC value,
- wherein calculating the ES value and calculating the AGC value comprises using a feedback delay variable for compensation in feedback of a brightness value of an image frame, and
- wherein the feedback delay variable comprises a brightness change value including brightness chance expected value of an image frame between an image frame with an input brightness value and the present image frame, and a brightness change expected value of the present image frame.
3 more elements
An automatic exposure (AE) control device, comprising:
- an image sensor to convert light intensity of an incident image into an analog image signal;
- an analog front end (AFE) capable of receiving the analog image signal to convert the analog image signal into a digital image signal, and controlling operations of the image sensor;
- and
- a controller capable of calculating an electric shutter (ES) value and an analog gain control (AGC) value using a proportional integral control method according to a brightness value of the digital image signal from the AFE, and capable of controlling an exposure time of the image sensor and an analog gain of the AFE using the calculated ES value and the calculated AGC value,
- wherein the ES value and the AGC value are calculated using a feedback delay variable for compensation in feedback of an inputted brightness value of an inputted image frame, and
- wherein the feedback delay variable comprises a brightness change value including a brightness than expected value of an image frame between an image frame with an input brightness value and the present image frame, and a brightness change expected value of the present image frame.
3 more elements
An automatic exposure (AE) controlling method, comprising:
- calculating, via a controller, an electric shutter (ES) value through a proportional integral control method;
- calculating, via the controller, an analog gain control (AGC) value through the proportional integral control method;
- and
- performing, via the controller, AE compensation on a present image frame using the calculated ES value and the calculated AGC value,
- wherein calculating the ES value and calculating the AGC value comprises using a feedback delay variable for compensation in feedback of a brightness value of an image frame, and
- wherein the proportional integral control method comprises using manipulated ES value and AGC value variables, and wherein each manipulated ES value and AGC value variable is calculated using the following equation:
- MVn=MVn-1+ΔMVn,
- where MVn represents a present value of the manipulated variable, MVn-1 represents a previous iteration value of the manipulated variable, and ΔMVn represents a derivative of the present value of the manipulated variable.
5 more elements
Dependencies are inferred from the claim text.