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Automatic focusing starting method for digital image pickup device

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 increasing reliability, realizing dynamic automatic focusing, and reducing human intervention factors.

Inactive Publication Date: 2009-10-14
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

Method used

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  • Automatic focusing starting method for digital image pickup device

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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] figure 1 It is a flow chart of an automatic focus starting method 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 ...

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Abstract

A method for starting autofocus of a digital image capture device, comprising: B: calculating the boundary information value of the current frame, and comparing it with the boundary information value after the previous autofocus is completed, if the absolute value of the difference between the two is greater than the threshold value 1 , then set need_focus=need_focus+1, go to E; C: Calculate the average brightness of each window in the N windows of the current frame, and compare it with the average brightness of each window in the N windows after the previous auto-focus is completed Compare separately, if the absolute value of the difference is greater than threshold 2 and the number is greater than threshold 4, then set focusYdiffcnt=focusYdiffcnt+1; D: if focusYdiffcnt is equal to need_focus+1, then set need_focus=need_focus+1; E: if need_focus≥ Threshold 3, then start autofocus.

Description

technical field [0001] The invention relates to a method for starting focus 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 requ...

Claims

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Application Information

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