Automatic aperture control device and automatic aperture control method of full HD (High-Definition) camera

A high-definition camera, automatic aperture technology, applied in the control of exposure, optics, cameras, etc., can solve the problem of inaccurate aperture position, and achieve the effect of simple circuit implementation, accurate control, and accurate aperture control.

Active Publication Date: 2014-05-28
北京博研高科技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this brightness calculation value directly for aperture control will result in inaccurate aperture position

Method used

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  • Automatic aperture control device and automatic aperture control method of full HD (High-Definition) camera
  • Automatic aperture control device and automatic aperture control method of full HD (High-Definition) camera

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Experimental program
Comparison scheme
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Embodiment 1

[0044] An automatic aperture control device for a full high-definition camera, including sequentially connected CMOS sensors (such as HD CMOS sensors) 1, a computing module, and an auxiliary device that assists the computing module to control the aperture. For example, if the computing module includes digitally controlled The analog circuit is a PWM (pulse width modulation) output value calculation module for controlling the aperture, then the auxiliary equipment that needs to be connected to the operation module is an integral circuit that converts the PWM output value to an analog voltage value, and the analog voltage value can control the opening of the aperture to the proper location. In this way, compared with the automatic aperture control device which uses the D / A conversion chip and its driving circuit as auxiliary equipment and does not have a PWM output value calculation module in the calculation module, the cost and power consumption of the system can be greatly redu...

Embodiment 2

[0051] A kind of automatic aperture control device of full high-definition video camera, comprises CMOS sensor 1 and operation module (similar to embodiment 1, can be FPGA logic processing module 2, CPLD logic gate or other ASIC device equally); The setting of described CMOS sensor 1 And function is the same as embodiment 1, also is arranged on lens rear, receives the input light that enters by the aperture of lens to make it form digital video image; CMOS sensor is connected with operation module, and the frame of CMOS sensor output digital video image is to operation module , the CMOS sensor has an exposure setting, and an exposure parameter and a gain parameter of a frame are calculated through the exposure setting. In this embodiment, the auxiliary equipment is a D / A conversion chip and its driving circuit; the CMOS sensor is sequentially connected with the operation module, the D / A conversion chip and its driving circuit. In this embodiment, the calculation module include...

Embodiment 3

[0055] On the basis of the structure of the above-mentioned embodiment 1 and embodiment 2, this embodiment proposes a preferred specific implementation method for accurately calculating the brightness gain: the exposure parameter includes the number of exposure lines exp_line, and the gain parameter includes the analog gain analog_gain and Digital gain digital_gain, the luminance gain, that is, the exposure and gain compensation value exposure is obtained by the formula exposure=exp_line×analog_gain×digital_gain (can be performed in the FPGA logic processing module 2).

[0056]If the unit conversion in practice is taken into account, that is, the gain (in dB) is converted into a multiple, then the brightness gain, that is, the exposure and gain compensation value exposure can be obtained by the formula exposure=exp_line×(analog_gain×Na)×(digital_gain×Nd ), where Na is the proportional coefficient of the analog gain, and Nd is the proportional coefficient of the digital gain. F...

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Abstract

The invention discloses an automatic aperture control device and an automatic aperture control method of a full HD (High-Definition) camera. The automatic aperture control device comprises a CMOS (Complementary Metal Oxide Semiconductor) sensor, an operation module and auxiliary equipment which are connected in sequence. The operation module comprises a frame brightness calculated value calculation module, an actual brightness value calculation module and a brightness difference calculation module, and is used for removing the brightness gain from the brightness calculated value of the frame and calculating the actual brightness value of the frame for aperture control. With the device and the method, the influence of the exposure and the gain value in the CMOS sensor on the aperture control is eliminated, the aperture control is accurate, the implementation method is simple and the cost is reduced.

Description

technical field [0001] The invention relates to an automatic aperture control device and method, in particular to an automatic aperture control device and method for a high-definition video camera. Background technique [0002] The aperture is the device used to control how much light passes through the lens. The aperture has a great influence on the imaging quality of the camera, and the size of the aperture can affect the brightness and depth of field of the image. Auto iris is to automatically control the aperture size of the lens, so as to obtain good image brightness and depth of field under different lighting conditions. [0003] Standard-definition cameras generally use CCD sensors, and the output of the CCD sensor is an analog video signal. The analog video signal can be used directly for video-driven auto-iris, or converted to a DC signal using a comparison and integration circuit for DC-driven auto-iris. [0004] For SD cameras using CMOS sensors, the output of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/238G03B7/085
Inventor 闫威
Owner 北京博研高科技术有限公司
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