Method for starting automatic focusing of digital image fetching device

A technology of autofocus and digital imaging, which is applied in the direction of focusing device, image communication, color TV parts, etc., to achieve the effect of increasing reliability, realizing dynamic autofocus, and reducing human intervention factors

Active Publication Date: 2009-10-14
BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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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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  • Method for starting automatic focusing of digital image fetching device

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Embodiment Construction

[0028] The basic thought of the present invention is, carry out statistics to image every M frame, obtain statistical value AF_datachange[N] according to N windows of each frame image, when AF_datachange[i] (i=1,2,...N) When the number exceeding the threshold 1 is greater than the threshold 2, set the variable need_focus+1 to end the statistics of the current frame. When need_focus exceeds threshold 3, start autofocus operation.

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] figure 1 It is a flow chart of an automatic focus activation method of a digital image capture device according to the present invention.

[0031] Each frame of image is divided into N windows, and a weight value p[i] can be set for each window, i=1, 2, . . . , N. The weight value indicates the importance of the image corresponding to the window. When the image corresponding to the window is negligible, the correspon...

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Abstract

A method of starting auto-focus, when the digital image capture device starts auto-focusing, and then performs the following steps every M frames: Obtain the statistical value of the current frame: AF_datachange[i]; according to each window corresponding to the current frame AF_datachange[i] calculates the number of AF_datachange[i] corresponding to the window whose weight is not 0 exceeds threshold 1: win_count; when the above win_count value exceeds threshold 2, set need_focus=need_focus+1; when the above need_focus value is greater than threshold 3 , start the auto focus, and obtain the statistical value AF_data2[i] of the corresponding frame, make: AF_data1[i]=AF_data2[i]; otherwise, do not start the auto focus operation.

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 卢虹由海陈雯飞
Owner BEIJING VIMICRO ARTIFICIAL INTELLIGENCE CHIP TECH CO LTD
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