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Automatic focusing method

An autofocus and zoom lens technology, applied in installation, television, optics, etc., can solve problems such as focus failure and achieve the effect of improving the accuracy of autofocus

Inactive Publication Date: 2014-02-12
ALTEK CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, in the focus frame 203, the notebook computer that is far away will still be focused on, causing the nearby pen to fail to focus.

Method used

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Embodiment Construction

[0036] Most of the digital single-lens cameras (Digital Single Lens Reflex Camera, DSLR) currently on the market adopt a two-stage button design. Among them, the first section is mainly responsible for the focus function or the parameter setting of the exposure value and white balance value, etc., while the second section will perform the exposure operation, that is, the official image shooting. Therefore, when the user is using a DSLR with a two-stage button design, he can first half-press the button to activate the auto-focus function. At this point, the lens of the digital camera will automatically focus according to the subject within the focus frame. After confirming that the focus is successful, the user fully presses the button (that is, presses the second button) to complete image shooting. The present invention switches the used auto-focus search algorithm according to the user's manipulation of the buttons of the image acquisition device. In order to make the conten...

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Abstract

The invention provides an automatic focusing method. The automatic focusing method includes the following steps that when first press signals generated due to the fact that a user presses buttons of an image acquisition device is detected, a regional maximum search method is used for performing an automatic focusing process; then, whether second press signals generated due to the fact that the user presses the buttons are detected or not is judged; if the second press signals are not detected, whether first release signals generated due to the fact that the user releases the buttons are detected or not is judged, and the continuous press number is calculated through the continuously-generated first release signals and the first press signals; whether the continuous press number is larger than a first critical value or not is judged; if the continuous press number is larger than the first critical value, a global maximum search method is used for performing the automatic focusing process, and otherwise, the regional maximum search method is still used for performing the automatic focusing process.

Description

technical field [0001] The present invention relates to an auto-focus technology, and in particular to an auto-focus method with a switchable focus value search algorithm. Background technique [0002] Digital Single Lens Reflex Camera (DSLR) has a very sophisticated and complex mechanical structure, which further enhances the functionality and controllability of the camera. In addition to factors such as the user's shooting skills and the influence of the surrounding environment, the built-in Auto Focus (AF) system of the DSLR also has a considerable impact on the quality of the captured image. [0003] Generally speaking, auto-focus technology means that DSLR will move the lens to change the distance between the lens and the subject, and calculate the focus evaluation value (hereinafter referred to as the focus value) of the subject picture corresponding to different lens positions until the focus value is found. to the maximum focus value. The maximum focus value indica...

Claims

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Application Information

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IPC IPC(8): G02B7/28G02B7/36H04N5/232
Inventor 林千翔廖明俊
Owner ALTEK CORP