Automatic focusing method and system

Abstract

The invention relates to the technical field of automatic focusing, in particular to an automatic focusing method and system. According to the automatic focusing method provided by the invention, the entropy function is adopted as a focusing evaluation function, the method is simple and easy to implement, the rapidity of a step-by-step search method and the high-precision characteristic of a split method are integrated, local optimization is achieved, the high sensitivity of the entropy function is matched, and the speed and precision of automatic focusing are improved. According to the automatic focusing system, a closed-loop control system is formed, a correct focus can be quickly found, the focusing precision can be improved, a detection module of the stepping motor is additionally arranged, positioning of the stepping motor can be accurately achieved, detection is conducted in a laser mode, and the positioning precision is high; and the fixed block is arranged to support the output shaft of the stepping motor, so that the output shaft of the stepping motor is prevented from moving, the system measurement error is reduced, and the automatic focusing precision is improved. According to the invention, the technical problem of low automatic focusing precision at present is solved.

Description

technical field [0001] The invention relates to the technical field of automatic focusing, in particular to an automatic focusing method and system. Background technique [0002] In the optical system, the lens has an optimal image plane position for imaging a target at a certain distance. This position usually satisfies the object-image conjugate relationship, which is called Focus. Deviation from this position will cause the system to defocus. , resulting in image quality degradation and blurred imaging. The larger the relative aperture of the optical system, the more obvious the effect of defocus performance. Defocus will directly affect subsequent information extraction and processing. [0003] Automatic focusing technology has been widely used in various precision instruments. The common focusing methods can be divided into active method and passive method according to whether the criterion comes from the object side or the image side. Distance detection; Passive law...

AI Technical Summary

Problems solved by technology

Chinese Patent 201810652650.2 - The camera automatic focusing system and method uses VGG-16 neural network to find the corresponding focus, uses the trained model to discriminate the picture to be tested, and outputs the focus distance of each target scene in the picture to be tested, Using this method to train the model requires a lot of calculations and the accuracy is not high

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