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

A high-definition camera and automatic aperture technology, which is applied to control exposure, optics, cameras, etc., can solve problems such as inaccurate aperture positions, and achieve the effects of simple circuit implementation, accurate aperture control, and cost reduction

Active Publication Date: 2012-08-01
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 ape

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0043] Example 1

[0044] An automatic iris control device for a full HD camera, including a CMOS sensor (such as an HD CMOS sensor) 1, an arithmetic module connected in sequence, and an auxiliary arithmetic module to control the iris, for example, if the arithmetic module contains digital control A PWM (Pulse Width Modulation) output value calculation module that controls the iris by an analog circuit, then the auxiliary device that the arithmetic module needs to connect is an integration circuit that converts the PWM output value to an analog voltage value, and the analog voltage value can control the iris opening To the right place. Compared with the automatic iris control device that uses the D / A conversion chip and its driving circuit as auxiliary equipment and does not have the PWM output value calculation module in the calculation module, the cost and power consumption of the system can be greatly reduced. There are many specific forms of arithmetic modules, such as FPGA ...

Example Embodiment

[0050] Example 2

[0051] An automatic iris control device for a full HD camera, including a CMOS sensor 1 and an arithmetic module (similar to embodiment 1, it can also be an FPGA logic processing module 2, a CPLD logic gate or other ASIC devices); the setting of the CMOS sensor 1 And the function is the same as the first embodiment, it is also set at the back of the lens, receiving the input light entering through the lens aperture to form a digital video image; the CMOS sensor is connected with the computing module, and the CMOS sensor outputs the frame of the digital video image to the computing module The CMOS sensor has an exposure setting, and the exposure parameter and gain parameter of the 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 connected to the arithmetic module, the D / A conversion chip and its driving circuit in sequence. In this embodiment, the ...

Example Embodiment

[0054] Example 3

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

[0056] If the actual unit conversion is considered, that is, the gain (in dB) is converted into multiples, 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 analog gain, and Nd is the proportional coefficient of digital gain. For example, Na=1149 / 1024, Nd=4...

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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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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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