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Automatic focusing method of camera

An auto-focus and camera technology, applied in the direction of camera, focusing device, installation, etc., can solve problems such as collision and shortening the life of the camera, and achieve the effect of short time consumption

Inactive Publication Date: 2013-03-13
SUZHOU KEDA TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the lens moves back and forth too much, it is easy to produce mechanical collisions and shorten the life of the camera

Method used

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  • Automatic focusing method of camera
  • Automatic focusing method of camera

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Embodiment Construction

[0018] The specific embodiment of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0019] It should be noted that, according to any embodiment of the present invention, the camera at least includes a photosensitive element, a focusing lens and a stepping motor, the photosensitive element is used for imaging the object to be photographed, and the focusing lens is used for adjusting the definition of the imaging, The stepper motor is used to drive the focusing lens to move forward and backward. The first end point is the limit position when the focus lens moves towards the photosensitive element, and the second end point is the limit position when the focus lens moves away from the photosensitive element.

[0020] Such as figure 1 As shown, the camera auto-focus system of the first embodiment of the present invention includes: a camera 20, which at least includes a photosensitive element, and the camera 20 makes an...

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Abstract

Provided is an automatic focusing method and a focusing system of a camera. The camera comprises a light sensing element, a focusing lens and a stepping motor. The light sensing element is used for imaging of an object to be shot. The focusing lens is used for adjusting imaging definition. The automatic focusing method includes the following steps: shooting the object to be shot to form an image, calculating first definition of the image, driving the focusing lens to move from first position to the next position with first step number, repeating the above process, determining the position of the focusing lens at the time when the first definition is highest to be first focusing position, driving the focusing lens to move to a third end portion, shooting the object to be shot to form an image, calculating second definition of the image and driving the focusing lens to move from the second position to the next position with second step number, wherein the second step number is smaller than the first step number. The method further includes repeating the process, determining the position of the focusing lens at the time when the second definition is highest to be the second focusing position and driving the focusing lens to move to the second focusing position. The method and the system are capable of accurately and quickly obtaining the optimum focusing position.

Description

technical field [0001] The invention relates to an automatic focusing method of a digital camera. Background technique [0002] In order to obtain the best shooting quality and clearly reproduce the object being photographed in the storage medium, the focusing lens in the digital camera must obtain an accurate focusing position; the manual focusing method has been difficult to meet the daily shooting in terms of accuracy and time requirements or as required in industrial applications. [0003] In the prior art, some auto-focus methods have appeared, such as the global search method. The global search method is to record the image obtained by moving the lens every step and calculate the sharpness of the image. When the lens is moved to all search positions in sequence and the sharpness value corresponding to each search position is obtained, the search is completed After that, find the lens position with maximum sharpness, move to this lens position to complete the autofocu...

Claims

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Application Information

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IPC IPC(8): G03B13/36G02B7/36
Inventor 张刘青
Owner SUZHOU KEDA TECH
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