Image change automatic sensing focusing method for microscopic camera

Abstract

The invention discloses an image change automatic sensing focusing method for a microscopic camera. The method comprises the following steps: defining a plurality of scene states according to change states of image brightness and an image evaluation function value; monitoring the real-time change conditions of the image brightness and the image evaluation function value of the current scene; determining the scene state of the current scene according to the real-time change condition of the image brightness and the image evaluation function value, and adopting a focusing monitoring strategy corresponding to the scene state according to the scene state, the focusing monitoring strategy comprising: entering a single focusing process after the image brightness and / or the image evaluation function value is recovered to be stable; and executing a single focusing process based on a hill climbing search method, and determining an optimal focusing position. According to the image change automatic sensing focusing method, different focusing strategies can be automatically adopted according to different focusing scenes, so that the focusing accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of microscopic camera auto-focusing, and in particular relates to an image change automatic sensing focusing method for a microscopic camera. Background technique [0002] Autofocus technology is a technology that uses modern microelectronics technology, digital image processing technology and mechanical control methods to digitally evaluate the clarity of the target scene, replace manual focus with automatic focus, and finally make the system a clear imaging technology. Autofocus technology is widely used in machine vision, military, security monitoring, smart phones and other fields, and has gradually developed into a complex technology integrating light, mechanics, electricity and computing. [0003] The early autofocus methods include ranging method and focusing method. Among them, the ranging method includes ultrasonic ranging method, infrared ranging method, laser ranging method and triangular ranging...

AI Technical Summary

Problems solved by technology

There are certain limitations in the hill-climbing search method: noise interference causes local peaks in the evaluation function curve, resulting in misfocusing

[0007] The above-mentioned methods are all single-shot focusing methods. The disadvantage is that after the scene changes, manual operation is required to achieve focusing.

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