DC-IRIS aperture driving and fast correction method

A driving method and aperture technology, applied in optics, exposure control, television, etc., can solve the problems of difficult aperture control logic and complex control structure of embedded AE exposure module, so as to improve image control effect, ensure stability margin, The effect of improving stability and reliability

Inactive Publication Date: 2018-01-30
TIANJIN HUISUN TECH
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AI Technical Summary

Problems solved by technology

[0004] The traditional DC-IRIS aperture driver samples the position information of the magnetic Hall, passes the feedback loop of the internal PID control module, and adds a large number of pre- and post-filter designs at the same time. The control structure is relatively complicated, resulting in the current mainstream embedded AE It is difficult for the exposure module to perform precise and better aperture control logic

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  • DC-IRIS aperture driving and fast correction method

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Embodiment Construction

[0021] The invention will be further technically explained below with reference to the drawings and embodiments.

[0022] Such as figure 1 As shown, a DC-IRIS diaphragm driving method, the diaphragm is built into the zoom lens; a Hall sensor is built in the diaphragm to detect the opening of the diaphragm; the diaphragm is opened and closed under the action of a DC motor drive circuit, and the motor is driven The circuit includes a current source for powering the Hall sensor; the output of the Hall sensor is connected to a gain amplifier, the gain amplifier is connected to the compensation DAC, and the output of the gain amplifier is connected to the ADC module; the output of the ADC module is connected to the second low-pass filter; the motor drive The circuit is also provided with an embedded main controller, the embedded main controller is provided with a brightness statistics module, the embedded main controller is also connected to a first low-pass filter; the first low-pass...

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Abstract

The invention discloses a DC-IRIS aperture driving and fast correction method. An aperture is arranged in a zoom lens; the aperture is opened and closed under the driving of a DC motor; a Hall sensorused for detecting an opening degree of the aperture is arranged in the aperture; the motor driving is controlled by an embedded main controller; and the embedded main controller is internally provided with a brightness statistical module. The DC-IRIS aperture driving and fast correction method comprises the steps of correcting a motor zero point, correcting a motor pole point, correcting an intermediate point and fitting curves. After a large number of actual comparison tests, the DC-IRIS aperture driving and fast correction method can realize the matching of an AE control strategy of an ISPcontrol module through 3-point fast correction of aperture mapping PIRIS driving step numbers, can guarantee the stability margin of the AE system, and improves the overall image control effect.

Description

Technical field [0001] The invention relates to the technical field of image acquisition, in particular to a DC-IRIS diaphragm driving and rapid correction method. Background technique [0002] At present, most mainstream image processors on the market can only drive simple PRIS iris devices, and cannot achieve precise control of DC-IRIS automatic iris. However, some of the integrated movement lenses on the market are basically DC- IRIS aperture, due to the inability to connect to the SDK interface module of the image processing system, complicates the automatic exposure algorithm of the exposure system and increases the uncertainty of equipment failure. [0003] In the actual industrial production of camera products, according to the difference of each lens, the position 0 and the maximum value of the stepping motor can be freely mapped. The specific situation needs to consider the accuracy of different applications and the computing performance of the processor itself. [0004] Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/235G03B7/085G03B7/08
Inventor 杨玉东吕增良
Owner TIANJIN HUISUN TECH
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