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Autofocus method and device

A technology of auto focus and focus direction, applied in the direction of focus devices, installations, instruments, etc., can solve the problems of slow focus speed and difficulty in focusing accurately, and achieve the effect of improving speed and accuracy, and good contrast sensitivity

Active Publication Date: 2018-06-22
SPREADTRUM COMM (SHANGHAI) CO LTD
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Problems solved by technology

[0005] The problem solved by the invention is that it is difficult to focus accurately and the focus speed is slow

Method used

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  • Autofocus method and device

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Experimental program
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Embodiment Construction

[0057] In the prior art, there are problems that it is difficult to accurately determine the focus position of auto-focus and the auto-focus speed is slow.

[0058] In order to solve the above problems, the technical solution of the present invention provides an automatic focusing method. figure 1 It is a schematic flow chart of the autofocus method provided by the technical solution of the present invention.

[0059] Such as figure 1 As shown, step S1 is first performed to obtain the first image corresponding to the position of the lens obtained by the imaging device every time the lens moves along the first direction by a first step, and determine the position of the lens according to the contrast of the first image Focus direction and first position.

[0060] First, the focus direction is detected, and the focus direction refers to the direction in which the lens moves from the current position to the focus position.

[0061] Move the lens along the first direction accor...

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Abstract

An autofocus method and device, the method comprising: acquiring a first image corresponding to the position of the lens obtained by an imaging device for every first step in which the lens moves along the first direction, and determining the focus direction and the focus direction of the lens according to the contrast of the first image The first position; acquire the second image corresponding to the lens position obtained by moving the imaging device every second step from the first position along the focus direction, and determine the second position according to the contrast of the second image; determine the focus range, the focus The range is an area centered on the second position; move the lens within the focus range, and determine the lens position corresponding to the image with the highest contrast among the lens positions within the focus range acquired by the imaging device as the focus position of the lens. The method can effectively improve the speed and accuracy of auto-focusing, especially when the imaging scene does not change too much, the focusing position can be acquired quickly and accurately.

Description

technical field [0001] The present invention relates to the field of autofocus technology, in particular to an autofocus method and device. Background technique [0002] Autofocus is an indispensable key technology in modern optical imaging systems. With the rapid development of science and technology, the precise focusing problem in digital imaging systems has attracted widespread attention. Autofocus refers to the process of changing the object distance and distance position through the focusing mechanism in the camera to make the image of the object being photographed clear. With the rapid development of electronic devices, various electronic devices including a shooting function are used more and more frequently, and users have higher and higher requirements for an auto-focus function. [0003] In order to obtain a clear image of the imaging device, it is necessary to make the imaging target on the plane of the image sensor, such as Complementary Metal Oxide Semiconduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03B13/36G02B7/28H04N5/232
Inventor 孙德印朱钧张新伟
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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