Infrared automatic focusing quick search method

A technology of automatic focus and search method, which is applied in the field of infrared automatic focus fast search, and can solve the problems of out-of-focus blur, image blur, and widening of the focus range.

Active Publication Date: 2021-05-18
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

[0002] With the further development of economy and science and technology, the requirements for infrared detection technology are also constantly increasing. The focal length of infrared telescopes is getting longer, the aperture is constantly expanding, and the imaging quality and the ability to detect and track targets are also constantly improving. The problem is that the focus range is wider, the depth of field is shorter, and the blur due to out o

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  • Infrared automatic focusing quick search method
  • Infrared automatic focusing quick search method
  • Infrared automatic focusing quick search method

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Embodiment Construction

[0027] Below in conjunction with accompanying drawing and example, the present invention is described in detail:

[0028] 1. Calculate image sharpness

[0029] The TenenGrad function value uses the Sobel operator to calculate the gradient value in the horizontal direction and the vertical direction, and uses the square operation to enlarge the gradient of the image edge. The evaluation function f(I) is defined as the sum of the squares of the gradient, T is introduced to adjust the sensitivity of the evaluation function, and the expression is formula (1).

[0030] 2. Automatic search algorithm

[0031] ① Initialize momentum m 1 =0,m 2 =0 and acceleration a=0, randomly select the stepping direction d of the focus motor as forward or reverse, and calculate the image sharpness value f before the first focus 0 , such as formula (1), set the basic step size of auto focus as s basic , for the first focusing. Each time the image definition value is calculated, it means that the...

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Abstract

The invention discloses an infrared automatic focusing quick search method. The search algorithm adopts a hill-climbing method with a variable step size, the accuracy of definition evaluation is ensured by using a method of solving image definition for multiple times and taking a median, and in a coarse focusing stage, instability in a focusing process is reduced by using a hill-climbing method of momentum and acceleration, and the number of steps required in the coarse focusing process is reduced. According to the method, the problems of inaccurate image definition calculation, high automatic focusing failure rate and low focusing speed of a traditional automatic focusing algorithm on the infrared telescope are effectively solved, and rapid and accurate automatic focusing on the infrared telescope is realized.

Description

technical field [0001] The invention belongs to the technical field of infrared detection and imaging, and in particular relates to an infrared automatic focusing fast search method, which is applicable to the field of target detection and tracking. Background technique [0002] With the further development of economy and science and technology, the requirements for infrared detection technology are also constantly increasing. The focal length of infrared telescopes is getting longer, the aperture is constantly expanding, and the imaging quality and the ability to detect and track targets are also constantly improving. The problem is that the focus range is wider, the depth of field is shorter, and the blur caused by out-of-focus is more severe. The prerequisite for the detection and tracking of the target by the detection system is to obtain a clear target image. During the process of tracking the target, the relative position and distance between the target and the detecti...

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Application Information

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IPC IPC(8): G02B7/36G02B7/38
CPCG02B7/36G02B7/38
Inventor 杨鹏博李洁崔文楠张涛
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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