Automatic focusing method for digital image pickup device starting

A technology of automatic focusing and digital imaging, which is applied in focusing devices, image communication, components of color TV, etc., to achieve the effect of dynamic automatic focusing, reducing cost and increasing reliability.

Inactive Publication Date: 2007-03-21
VIMICRO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up, the activation of autofocus in the prior art is realized through complex electronic, optical and mechanical devices, and all require people to actively or passively participate in this process, and it is impossible to truly automatically focus

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  • Automatic focusing method for digital image pickup device starting

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Embodiment Construction

[0032] The basic idea of ​​the present invention is to perform an automatic focus detection on the image every M frames, make a comprehensive judgment according to the edge information value (edge_sum) and brightness average value (YMean) of the currently detected frame, and start the automatic focus when certain conditions are met operate.

[0033] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] FIG. 1 is a flow chart of a method for activating auto-focus of a digital image capture device according to the present invention.

[0035] Autofocus detection is performed on the image every M frames, and the edge information value edge_sum of the detected frame needs to be obtained for autofocus detection, which can be obtained by the following method:

[0036] First, the frame image is converted into a grayscale image, and then the edge of the image is extracted, and the value of each point on the edge i...

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Abstract

A auto-focusing method of digital image acquisition device, includes the following steps : B : calculate the border information of the current frame value, compare this border information with the former border information, if the difference between them is greater than the threshold value which is one, let need_focus=need_focus+1, turn to E; C: calculate the average luminance of N current window frames, and compare this average l with the former average luminance of N current window frames, if the count of that the absolute value of the difference is greater than the threshold value of two is greater than four, let the focusYdiffcnt=focusYdiffcnt+1; D: if focusYdiffcnt is equal to need_focus +1, let need_focus=need_focus+1; E: if need_focus is greater or equal to three, activate the auto-focusing; G: on the frame of N return to A.

Description

technical field [0001] The invention relates to a method for starting focusing of an image capture device, in particular to a method for starting automatic focus of a digital image capture device. Background technique [0002] There are several ways to start the focusing system of image capture devices such as traditional cameras, digital cameras, video cameras, etc.: [0003] 1. Manual start: [0004] This is the earliest and most common way to start. The AF system activation button of most AF (Auto Focus, automatic focus) cameras is shared with the shutter release button. The role of the shutter release button is multiple, and its travel is divided into two sections. Press the shutter release button halfway to activate the AF system and light metering system. After autofocus is completed, press the shutter release button all the way to release the shutter. But this way of starting the focus is inconvenient to use. [0005] 2. Eye activation: [0006] Eye activation r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36H04N5/225
Inventor 卢虹胡庆庆王浩
Owner VIMICRO CORP
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