An image definition calculation method, automatic focusing method and system

Abstract

An image definition calculation method, an automatic focusing method and a system, the automatic focusing method and method comprising: Step 1, perform preliminary focusing on the lens, and move the lens to the focus limit value range; Step 2, take a target image, calculate The sharpness of each frame of the image; step 3, based on the sharpness value of each frame of the image, drive the zoom motor to move, and perform peak search until the zoom motor moves to the focus position corresponding to the maximum sharpness, and completes the automatic focus. The present invention performs preliminary focusing first, then calculates the sharpness after the preliminary focusing, and finally performs peak search, drives the zoom motor to move to the focus position corresponding to the maximum sharpness, and completes the focusing. The requirements are not high, the focusing speed is fast and the focusing precision is high.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an image definition calculation method, an automatic focusing method and a system. Background technique [0002] In recent years, with the continuous advancement of digital image processing technology, optical lens and image sensor technology, more and more imaging devices use auto-focus technology to replace cumbersome manual focus. The current main autofocus methods can be divided into three categories: [0003] One is the active focusing method based on the ranging element, such as the focusing method based on the laser ranging sensor, the distance between the target and the lens is obtained according to the laser ranging, and the focusing is carried out according to the principle of optical imaging; the other is based on image information The contrast focusing method, such as the focusing method based on the gradient information of the image, calculates the gradient value of ...

AI Technical Summary

Problems solved by technology

[0005] 1. The active focusing method based on the ranging element has a limited measurement range, and there are problems such as the object itself may absorb light or waves, and the emitted light waves may be blocked by obstacles;

[0006] 2. The contrast focusing method based on image information has a process of repeated lens movement, slow focusing speed, and poor user experience;

[0007] 3. The phase focusing method based on the photosensitive element has high requirements on light, and the speed and performance of focusing will be significantly reduced for low-light environments

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