Automatic focusing method and automatic focusing apparatus of electronic camera

An automatic focus and camera technology, applied in the direction of cameras, focusing devices, color TV parts, etc., to achieve the effect of shortening the focusing time

Inactive Publication Date: 2006-04-26
ASIA OPTICAL CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing mountain-climbing focus method must drive the motor back and forth to obtain the focus position, and there is still room for improvement in the focus time

Method used

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  • Automatic focusing method and automatic focusing apparatus of electronic camera
  • Automatic focusing method and automatic focusing apparatus of electronic camera
  • Automatic focusing method and automatic focusing apparatus of electronic camera

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Embodiment Construction

[0041] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are listed below and described in detail with reference to the accompanying drawings.

[0042] The invention provides an automatic focusing method and an automatic focusing device of an electronic camera.

[0043] Embodiments of the present invention find out the maximum evaluation value (i.e. high-frequency component) of the image to be captured by stepwise comparison to the left or right relative to the center point of the zoom lens (Center), and the maximum evaluation value is the best focus point Evaluation value.

[0044] In an embodiment of the invention, the number of steps the motor moves is determined by the following formula:

[0045] K = Floor ( 1 / FR SP ) ...

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Abstract

The invention provides a self-focusing method and device of electronic camera, which finds the maximum evaluation value of being shot image. The maximum evaluation is high frequency component, which is optimum focusing point evaluation value. The invention moves at non-fixing steps activation motor, which needn't move motor reciprocally.

Description

technical field [0001] The invention relates to a camera auto-focus method, in particular to a method for predicting focus position by using image evaluation value to shorten focus time. Background technique [0002] In order to control the automatic focusing of the zoom lens of the camera, the existing focusing method is to use the evaluation value generated according to the image signal as the judgment basis for automatic focusing, which requires multiple reciprocating movements of the lens group for the whole process of rough scanning and subsequent fine scanning. , in order to obtain the evaluation value of each focus position. Then, analyze and compare according to the focus mode, 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 transmission components. If the focused image is not the im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36H04N5/225H04N5/232
Inventor 林毅轩
Owner ASIA OPTICAL CO INC
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