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Automatic focusing method of camera

An auto-focus and camera technology, applied to cameras, focusing devices, optics, etc., can solve problems such as inconvenient use, difficult focusing, and multi-focusing time

Inactive Publication Date: 2003-05-14
KINPO ELECTRONICS
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0002] The automatic focus device of general digital camera, digital video camera, digital image capturing device, such as Taiwan Patent Publication No. 315427 "autofocus device and method for zoom lens of digital electronic camera" disclosed, is provided with a focus evaluation value generator The focus evaluation value of the image is calculated, and the focus motor is driven according to the focus evaluation value to perform the automatic focus of the camera. However, to obtain the focus point, the zoom lens needs to perform the whole process of rough scanning and subsequent fine scanning, which is a waste of time.
Due to optical reasons and limited cost considerations, the current auto-focus method is divided into two modes: "normal" and "micro-focus". Users often have to distinguish which mode the environment is in before focusing, and manually switch to the appropriate focus mode. , to complete the autofocus in a short time, if the user neglects to switch the focus mode, it will be difficult to focus correctly, or it will take more time to focus, so it is still inconvenient to use

Method used

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Embodiment Construction

[0020] see figure 1 As shown, when the camera captures an image at a long distance, such as 3 meters (this distance varies depending on the magnification), at one magnification, calculate the evaluation value of the image captured by the CCD (charged coupling device) and Draw a relationship diagram with respect to the position of the zoom lens, it can be seen that the peak of its evaluation value (that is, the focusing point) is located at the position of the first segment F1; the first point 10 corresponding to the first three evaluation values ​​a, b, and c is shown in the figure , the second point 20, and the third point 30 are in an upwardly inclined arrangement; if the subject is farther away, the arrangement of the three points may be that the second point 20 has the largest evaluation value b, and the first point 10 The evaluation value a and the third point 30 evaluation value c are both small: when the subject is very far away, the arrangement of the three points is t...

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Abstract

The automatic camera focusing method includes preset several evaluation values and possible focus ranges based on environment brightness value before initial scanning; coarse focusing in the possiblefocus ranges one by one until finding the focus range; fine focusing in the found focus range; and making the lens return to the peak position found in fine focusing. By means of the focus forecasting technology and simplified motor shifting process, the present invention has short focusing time and needs no manual focusing.

Description

technical field [0001] The present invention relates to an automatic focusing method of a zoom lens of a digital camera, a digital video camera, a digital image capture device, etc., especially a method of using the first three evaluation values ​​to predict the possible focus position to shorten the focusing time. Background technique [0002] The automatic focus device of general digital camera, digital video camera, digital image capturing device, such as Taiwan Patent Publication No. 315427 "autofocus device and method for zoom lens of digital electronic camera" disclosed, is provided with a focus evaluation value generator The focus evaluation value of the image is calculated, and the focus motor is driven according to the focus evaluation value to perform automatic focusing of the camera. However, to obtain the focus point, the zoom lens needs to perform the whole process of rough scanning and subsequent fine scanning, which is a waste of time. Due to optical reasons a...

Claims

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Application Information

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IPC IPC(8): G03B13/36
Inventor 刘权辉
Owner KINPO ELECTRONICS
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