Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

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
View PDF0 Cites 14 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Automatic focusing method for digital image pickup device starting

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36H04N5/225
Inventor 卢虹胡庆庆王浩
Owner VIMICRO CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com