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Method and device for calculating auto-focus statistical information

A statistical information and auto-focus technology, applied in the field of image processing, can solve the problems of low focusing speed and accuracy of the camera equipment, inaccurate auto-focus statistical information, etc.

Active Publication Date: 2017-07-04
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the autofocus statistical information of the subject obtained by the above method is inaccurate, resulting in low focusing speed and focusing accuracy of the imaging device.

Method used

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  • Method and device for calculating auto-focus statistical information

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Embodiment Construction

[0107] Auto Focus (Auto Focus) utilizes the principle of light reflection of the subject. The light reflected by the subject is received by the image sensor (such as CCD / CMOS sensor) of the camera and other imaging equipment, and the automatic focus of the subject is calculated through computer processing. focusing statistical information, driving the electric focusing device to focus according to the automatic focusing statistical information. Therefore, the accuracy of the auto-focus statistical information directly affects the focusing speed and accuracy of the camera device.

[0108] Currently, by multiplying the subject with the Scharr operator, the autofocus statistical information of the subject is calculated.

[0109] However, the autofocus statistical information of the subject obtained by the above method is inaccurate, resulting in low focusing speed and focusing accuracy of the imaging device.

[0110] In order to solve the above-mentioned problems, the embodiment...

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Abstract

The invention discloses a method and device for calculating auto-focus statistical information. The method comprises the following steps: obtaining an image block that takes a pixel to be processed as a center pixel as a first image block, wherein the first image block is selected from photographed images and has the auto-focus statistical information to be extracted; according to the color of the center pixel of the first image block, selecting the preset number of sub-image blocks to form a second image block by taking the pixel which has the same channel as the center pixel and can form the sub-image blocks with preset sizes in the range of the first image block as the center; determining the strong edge contained in the first image block according to the pixel value difference information between the sub-image blocks in the second image block; and according to the strong edge contained in the first image block, calculating to obtain the auto-focus statistical information of the first image block by adopting a corresponding operator matrix. By adopting the above scheme, the accuracy of the auto-focus statistical information of the photographed objects can be increased.

Description

technical field [0001] The present invention relates to the field of image processing, in particular to a calculation method and device for automatic focusing statistical information. Background technique [0002] Camera devices, such as cameras and mobile phones with integrated cameras, are usually capable of autofocus. [0003] Auto Focus (Auto Focus) utilizes the principle of light reflection of the subject. The light reflected by the subject is received by the image sensor (such as CCD / CMOS sensor) of the camera and other imaging equipment, and the automatic focus of the subject is calculated through computer processing. focusing statistical information, driving the electric focusing device to focus according to the automatic focusing statistical information. Therefore, the accuracy of the auto-focus statistical information directly affects the focusing speed and accuracy of the camera device. [0004] Currently, by multiplying the subject with the Scharr operator, the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/232H04N5/217G06T7/13
CPCH04N23/81H04N23/67
Inventor 胡毅蔡进王浩
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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