A Fast Search Method for Infrared Auto Focus

Abstract

The invention discloses a fast search method for infrared automatic focus. The search algorithm adopts a hill-climbing method with a variable step size, and uses the method of finding the median of the image sharpness multiple times to ensure the accuracy of the sharpness evaluation. The method reduces the instability in the focusing process and reduces the number of steps required for the rough focusing process. The invention effectively solves the problems of inaccurate calculation of image definition, high auto-focus failure rate and slow focusing speed on the infrared telescope by the traditional auto-focus algorithm, and realizes fast and accurate auto-focus on the infrared telescope.

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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