Automatic focusing control system and control method for lens module based on MTF (Modulation Transfer Function)

Abstract

The invention discloses an MTF-based lens module automatic focusing control system and method, the system comprises an imaging module, an actuator and an automatic focusing controller, the imaging module comprises a guide rail, and a camera, a lens module and a target light source which are coaxially and sequentially arranged on the guide rail, the lens module and the target light source are fixed, the actuator controls the camera to move, and the automatic focusing controller is connected with the actuator. The distance between the camera and the lens module is adjusted, the camera collects multiple target light source images under different displacements through the lens module and sends the multiple target light source images to the automatic focusing controller, and the automatic focusing controller processes the multiple target light source images to obtain MTF arrays corresponding to the multiple target light source images under the specific frequency. And controlling the camera to move to a position corresponding to the maximum MTF value through the actuator to realize automatic focusing control. According to the invention, full-automatic focusing control is realized, configurability can be realized according to different lenses, and an efficient and accurate focusing method of the lens module and the camera is provided for operators.

Description

technical field [0001] The invention relates to a lens module control technology, in particular to an MTF-based lens module automatic focusing control system and control method. Background technique [0002] With the continuous improvement of the level of industrial automation, traditional manual focusing methods and low-quality automatic focusing can no longer meet the requirements of production and application. For a long time, employees can only spend a lot of time in the repetitive sharpness measurement process. For this reason, the problems in the calibration and installation of the real lens imaging system can be effectively solved, and the work efficiency and work quality of the installation personnel can be improved. As the requirements increase, the system requirements for focusing software are also increasing. [0003] In the quality evaluation of no reference image, the sharpness of the image is an important indicator to measure the quality of the image, which ca...

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