Video auto-focusing system based on embedded media processor

An automatic focus and processor technology, applied in focusing devices, instruments, installations, etc., can solve the problems of low focus accuracy and stability, poor smoothness, etc.

Inactive Publication Date: 2010-09-22
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the deficiencies of the existing video automatic focusing system, such as low focusing accuracy, stability, and poor smoothness, the pr...

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  • Video auto-focusing system based on embedded media processor
  • Video auto-focusing system based on embedded media processor
  • Video auto-focusing system based on embedded media processor

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Embodiment Construction

[0035] The present invention will be further described below in conjunction with the accompanying drawings.

[0036] refer to Figure 1 to Figure 7 , a video autofocus system based on an embedded media processor, comprising: a video acquisition module 7, used to obtain raw video image data from a camera; an image acquisition processing module 8, used to perform noise processing on the obtained raw video image data , and extract the Y component therein, adopt the sensing area area selection algorithm based on area segmentation to extract the focus area, and use the Tenengrad function based on the Sobel gradient operator to perform sharpness calculation; the focus search module 9 is used to determine the direction of lens movement, and Determine the basic step size of the search step according to the current zoom value; read the sharpness value of the image at the current lens position, and set its value as f 1 , and the sharpness value f of the previous frame image 2 Compare ...

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Abstract

The invention relates to a video auto-focusing system based on an embedded media processor. The system comprises a video collection module, an image acquisition and processing module, a focusing search module and a focusing execution module, wherein the acquisition and processing module is used to perform noise processing to the obtained original video image data and extract Y-component in the data, wherein the induction area selection algorithm based on region segmentation is adopted to extract focus area, the Tenengrad function based on Sobel gradient operator is adopted to calculate definition; the focusing search module is used to determine the moving direction of the camera lens and calculate the required step length (mov_step = step*level) of the lens; the position corresponding to the maximum definition value is used as focus position; and the focusing execution module is used to transmit control signals to a stepping motor used for driving the lens so as to adjust the position of the lens, according to the determined moving direction and step length of the lens in the focusing search module. By using the video auto-focusing system, the focusing accuracy and stability can be effectively increased, and the smoothness is improved.

Description

technical field [0001] The invention relates to the technical field of video auto-focus, in particular to a video auto-focus system. Background technique [0002] Video auto-focus technology is one of the key technologies of modern machine vision. When people obtain a clear image through a camera, it often takes a long time to focus on the scene. Due to the complexity of the focusing environment, it is difficult to ensure the smoothness of the focus during the focusing process, that is, the changes in the clarity of the image are inconsistent. Therefore, how to realize fast, accurate and smooth video automatic focusing is very important. [0003] At present, video auto-focus technologies for cameras mainly include active focus methods and passive focus methods. Because image-based passive autofocus does not require additional auxiliary devices, it is widely used in digital cameras. Such as publication number is 101034198 (application number is 200710079748.5) Chinese pat...

Claims

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Application Information

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IPC IPC(8): G02B7/36G03B13/36
Inventor 陈朋刘连杰杨雷刚俞立
Owner ZHEJIANG UNIV OF TECH
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