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Method for calculating image definition value for focusing, computing device and focusing system

A technology of image definition and computing equipment, which is applied in the direction of image communication, TV system components, color TV components, etc., which can solve the problem that it is difficult to ensure the consistency of product test parameters, and the production efficiency is difficult to meet large-scale production, etc. question

Active Publication Date: 2018-11-16
广西释码智能信息技术有限公司
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AI Technical Summary

Problems solved by technology

Fixed-focus cameras have certain requirements for imaging distance in different application scenarios. Because manual focusing is difficult to ensure the consistency of product test parameters, and production efficiency is also difficult to meet the needs of large-scale production, an automatic focusing method or The device adjusts the focus of the fixed-focus lens (focal plane positioning)

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  • Method for calculating image definition value for focusing, computing device and focusing system
  • Method for calculating image definition value for focusing, computing device and focusing system
  • Method for calculating image definition value for focusing, computing device and focusing system

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Embodiment Construction

[0041] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided for more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0042]For a fixed-focus camera, its focal length is fixed. In order to ensure that the fixed-focus camera obtains a clear image when in use, the focus is completed by adjusting the distance between the image sensor and the lens (focal plane positioning). Focusing can be divided into two categories: one is based on distance measurement between the lens and the object to be photographed AF, and the other is based on focus detection AF...

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Abstract

The invention discloses a method for calculating an image definition value for focusing, a computing device and a focusing system. The method performed in the computing device comprises: a grayscale image of a test card arranged at a predetermined distance of a prime lens is obtained, wherein the test card includes am image combination unit including a white cross portion, a black circle portion centering on the white cross portion and a gray circular disk portion centering on the white cross portion; the center point of the white cross portion is located and a pixel area including the image combination unit is obtained based on the center point; edge extraction is carried out on the pixel area to obtain a cross edge and a circular ring edge; comparison values between all pixels and surrounding pixels at the cross edge are calculated and an average comparison value is calculated; an average grayscale of the internal area of the circular ring edge is calculated; and on the basis of theaverage grayscale and the average comparison value, an image definition value of the grayscale image is calculated. Therefore, the accuracy of the focusing of the prime lens is improved and local focusing is carried out on the image.

Description

technical field [0001] The invention relates to the technical field of automatic focusing, in particular to an image definition calculation method for focusing, a calculation device and a focusing system. Background technique [0002] Focusing is to make the object to be photographed form a clear image on the plane of the photosensitive chip. Fixed-focus cameras have certain requirements for imaging distance in different application scenarios. Because manual focusing is difficult to ensure the consistency of product test parameters, and production efficiency is also difficult to meet the needs of large-scale production, an automatic focusing method or The device adjusts the focus of the fixed-focus lens (focal plane positioning). [0003] Compared with the traditional auto-focusing algorithms based on ranging method and image detection method, the auto-focusing method based on image processing has the advantages of intelligence and low power consumption. Its core is the sha...

Claims

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Application Information

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IPC IPC(8): H04N5/232H04N17/00
CPCH04N17/002H04N23/67
Inventor 王晓鹏
Owner 广西释码智能信息技术有限公司
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