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Automatic focusing method and electronic device therewith

An autofocus, one-pair technology, applied in the field of using focus evaluation value to evaluate focus position to shorten focus time, can solve problems such as long focus time and blur, and achieve the effect of accurate auto focus process

Inactive Publication Date: 2007-01-17
ASIA OPTICAL CO INC
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing mountain-climbing focusing method must drive the motor back and forth to obtain the focus position, which still takes a long time for focusing. Therefore, the present invention provides an automatic focusing method to achieve faster and more accurate focusing.
[0011] The existing focusing methods mentioned above all use the position of the maximum...

Method used

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  • Automatic focusing method and electronic device therewith
  • Automatic focusing method and electronic device therewith
  • Automatic focusing method and electronic device therewith

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Embodiment Construction

[0030] In order to make the purpose, features and advantages of the present invention more obvious and understandable, the preferred embodiments are specially cited below, together with the attached drawings Figure 3 to Figure 6 , give a detailed explanation. The description of the present invention provides different examples to illustrate the technical features of different implementations of the present invention. Wherein, the configuration of each element in the embodiment is for illustration, not for limiting the present invention. In addition, part of the symbols in the figures in the embodiments are repeated for the purpose of simplifying the description, and do not imply the relationship between different embodiments. In addition, the embodiment of the present invention is described by taking an electronic camera as an example, but it is not limited thereto. Any electronic device (such as a scanner) that needs to perform a focusing procedure is applicable to the meth...

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Abstract

This invention supplies an automatic focusing method and the electronic installation of using this method. The automatic focusing method is to set several walking step lengths of driving motor and a couple of focusing orbit's length. The method also supplies a storage medium. Let the driving motor shift to one initial point and empty the storage medium. The driving motor drives a couple of focusing eyeglasses orderly move to several sampling points. It also will make the wanted screen's focusing evaluation of estimate which is correspond to each sampling point and the walking step lengths which is correspond to the focusing evaluation of estimate store in the storage medium. According to them above, by using a statistic equation to calculate we can get a weighted arithmetic mean. This driving motor will drive the focusing eyeglasses move to a focusing point in response to this weighted arithmetic mean. This invention puts the quick and accurate focusing course into effect.

Description

technical field [0001] The present invention relates to an automatic focus method, and in particular to a method for evaluating the focus position by using the focus evaluation value to shorten the focus time. Background technique [0002] In order to control the autofocus of the lens of the camera, the existing focusing method is to use the evaluation value generated according to the image signal as the basis for autofocus judgment. Scanning and other procedures to obtain the evaluation value of each focus position. Then analyze and compare according to the focus mode to find out the focus position, and then move the lens group to the focus position. Since it is necessary to repeatedly drive the motor to move the lens group, it is quite time-consuming and will increase the wear rate of the motor and the transmission components. If the focused image is not the desired image, the focusing action needs to be repeated, which wastes the focusing time. [0003] The aforementio...

Claims

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Application Information

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IPC IPC(8): G03B13/36
Inventor 卓清源陈丰庚
Owner ASIA OPTICAL CO INC
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