Automatic focusing method and device for image sharpness curve fitting based on least square method

A technology of image definition and least squares method, applied in image communication, color TV parts, TV system parts, etc., can solve the problems of only obtaining the clearest point of partial images and slow focusing

Inactive Publication Date: 2018-12-14
WUHAN JINGCE ELECTRONICS GRP CO LTD
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[0003] Aiming at the above defects or improvement needs of the prior art, the present invention provides an aut

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  • Automatic focusing method and device for image sharpness curve fitting based on least square method
  • Automatic focusing method and device for image sharpness curve fitting based on least square method
  • Automatic focusing method and device for image sharpness curve fitting based on least square method

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[0057] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0058] refer to figure 1 , the autofocus device provided by the embodiment includes a lens, a camera, a stepping motor, an image acquisition module, a communication module, a control module, and a calculation module;

[0059] Among them, there is a connection between the camera and the image acquisition module, a connection between the camera and the lens, a communication connection between the len...

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Abstract

The invention belongs to the technical field of image detection, The invention discloses an automatic focusing method and a device for image definition curve fitting based on the least square method.The method comprises the following steps: performing three fixed-length sampling, fitting the image definition curve by the least square method according to the sampling points sampled by the third fixed-length sampling, and determining the extreme value of the image definition evaluation value according to the fitting binomial curve; when the extreme value of the image sharpness evaluation valueexceeds the determination threshold of the image sharpness, it is determined to realize auto-focusing; wherein, the sampling step interval of the second sampling is determined according to the sampling value of the first fixed-length sampling; The sampling step interval of the third sampling is determined according to the sampling value of the second fixed-length sampling. In the process of auto-focusing, the number of times of calculating image sharpness is much less than that of climbing and searching algorithm, which shortens the focusing time. Moreover, the method solves the problem that the hill-climbing search algorithm can only obtain the clearest point of the local image, and realizes the global auto-focusing.

Description

technical field [0001] The invention belongs to the technical field of image detection, and in particular relates to an automatic focusing method and device for fitting an image sharpness curve based on a least square method. Background technique [0002] In the prior art, the hill-climbing search algorithm used in the auto-focus system searches back and forth with the motor moving a short distance near the maximum value of the image sharpness curve, causing the hill-climbing search algorithm to focus slowly; and the hill-climbing search algorithm can only obtain the local image maximum Clarity issue; it needs to be improved. Contents of the invention [0003] Aiming at the above defects or improvement needs of the prior art, the present invention provides an autofocus method and device for image sharpness curve fitting based on the least squares method. The clearest question. [0004] In order to achieve the above object, according to one aspect of the present invention...

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Application Information

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IPC IPC(8): H04N5/232
CPCH04N23/67H04N23/64
Inventor 李波欧昌东杨阳
Owner WUHAN JINGCE ELECTRONICS GRP CO LTD
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