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Automatic focusing method, automatic focusing device and digital camera device

A technology of automatic focusing and focal length, applied in focusing device, installation, image communication, etc., can solve the problem of inaccurate optimal focal length, etc., and achieve the effect of accurate focal length value and high focusing precision

Inactive Publication Date: 2011-03-02
SHENZHEN WISION TECH HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the existing focusing methods use analog methods, that is, setting the center of the image frame as a window, extracting the high-frequency components of the image, and constantly changing the depth of field. When the high-frequency components reach the maximum, it is the best time for focusing. But the optimal focal length calculated by this method is not accurate enough

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  • Automatic focusing method, automatic focusing device and digital camera device
  • Automatic focusing method, automatic focusing device and digital camera device
  • Automatic focusing method, automatic focusing device and digital camera device

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Embodiment Construction

[0020] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0021] Please refer to figure 1 , the digital camera 100 includes a lens assembly 110, an image sensor 120, an auto-focus device 130 and a lens adjustment assembly 140. The lens assembly 110 is used to change the focal length by moving, and includes a focusing lens. The image sensor 120 is used to receive an optical signal passing through the lens assembly 110, convert the optical signal into an electrical signal, and output image data. The image sensor 120 may be a CCD image sensor or a CMOS image sensor. The auto-focus device 130 is used for receiving image data from the image sensor 120 and executing an auto-focus algorithm to obtain an optimal focus value. The lens adjustment assembly 140 is used to adjust the position of the lens assembly according to the optimal focal length value to achieve focusing. Lens adjustment asse...

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Abstract

The invention discloses an automatic focusing method, an automatic focusing device and a digital camera device. The automatic focusing method comprises the following steps: adopting a predetermined window to scan image frames; extracting margin gradients of images in windows at different scanning positions; obtaining the assemblages of the margin gradients in the windows; comparing the margin gradient assemblages of the windows, and determining the window with the maximum margin gradient assemblage as a theme window; and obtaining an optimum focusing value on a basis of the theme window. The invention adopts the margin extraction method to obtain the optimum focusing value, and the obtained optimum focusing value is more accurate and has higher focusing accuracy.

Description

technical field [0001] The invention relates to an automatic focus technology of a digital camera. Background technique [0002] Autofocus is a very important function in various digital cameras and digital cameras at present. Auto focus is to use the optical system to form an image on the image sensor, convert the optical information of the image itself into an electrical signal, calculate the auto focus value through a certain algorithm, and use the auto focus value to drive the motor to move the lens and adjust the focal length to obtain The clearest images. Most of the existing focusing methods use analog methods, that is, setting the center of the image frame as a window, extracting the high-frequency components of the image, and constantly changing the depth of field. When the high-frequency components reach the maximum, it is the best time for focusing. But the optimal focal length calculated by this method is not accurate enough. Contents of the invention [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232G03B13/36G02B7/34H04N5/225
Inventor 陈天健赵勇
Owner SHENZHEN WISION TECH HLDG