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Method and apparatus for automatic focusing

An automatic focus and post-focus technology, applied in the field of image processing, can solve the problem that the focus method cannot guarantee the focus of the area of ​​interest, etc., and achieve the effect of improving focus accuracy and good subjective visual effects

Inactive Publication Date: 2013-12-04
ZTE CORP
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Problems solved by technology

[0004] The purpose of the present invention is to provide an automatic focusing method and device to solve the problem that the existing focusing method cannot always focus on the region of interest

Method used

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  • Method and apparatus for automatic focusing
  • Method and apparatus for automatic focusing

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Embodiment Construction

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0028] like figure 1 As shown, it is a functional block diagram of a preferred embodiment of the automatic focusing device of the present invention. This embodiment includes an automatic focusing module 01, an area of ​​interest focusing monitoring module 02, and a scene monitoring module 03, wherein,

[0029] The automatic focus module 01 is used to focus the image according to the evaluation function value of the image; the automatic focus module 01 includes a data analysis submodule 10 and a focus execution submodule 20,

[0030] The data analysis s...

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Abstract

The invention relates to a method and apparatus for automatic focusing. The method comprises the following steps that: a focused image is divided into more than two sub blocks; a position of one sub block with the maximum evaluation function value is found out and whether the position which the sub block is located at is in a region of interest; and if the position which the sub block is located at is not in a region of interest and the current focusing mode is a local searching mode, weighting processing is carried out on the evaluation function of the image and re-focusing is carried out on the image. The provided apparatus consists of an automatic focusing module, a region of interest focusing monitoring module, and a scene monitoring module. automatic focusing of the region of interest can be realized and the focusing precision is improved.

Description

technical field [0001] The invention relates to the field of image processing, in particular to an automatic focusing method and device. Background technique [0002] Auto Focus (AF) technology means that the lens automatically adjusts the focus on the object being photographed, so as to obtain the clearest image. This technology has been widely used in imaging products such as video cameras, digital cameras, and mobile phones. [0003] The automatic focus system based on image processing collects a series of images through the lens and CCD / CMOS sensor, and evaluates the value of the evaluation function (focus function) for each frame of the image (the value of the evaluation function represents the clarity of the image, the larger the value, the higher the clarity. The higher the calculation, judge whether it is in focus, and give a feedback signal to control the movement of the lens until the collected image meets certain conditions. When the depth of the scene in the vi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03B13/36G02B7/36
Inventor 杜昕欧阳典勇贾少华任江涛
Owner ZTE CORP
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