Infrared automatic focusing quick search method

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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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 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 detection system may be constantly changing. Focusing operation, the image of the target by the detection system may be severely blurred, making the tracking system not work properly or even losing the target

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