A method and device for global automatic focusing of infrared images

An infrared image and auto focus technology, applied in the field of image processing, can solve the problems of poor image non-uniformity, dependent focus frame selection, poor real-time performance, etc., to reduce the probability of falling into the maximum value of the neighborhood, and achieve the effect of fast global focusing

Active Publication Date: 2020-08-21
BEIJING AEROSPACE FUDAO HIGH TECH
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Problems solved by technology

[0006] The present invention mainly solves the technical problems that the infrared system in the prior art has poor image non-uniformity, low contrast and signal-to-noise ratio, and processing difficulties caused by difficult focusing, poor real-time performance, and dependence on the selection of the focusing frame. A method and device for global automatic focusing of infrared images are provided

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  • A method and device for global automatic focusing of infrared images
  • A method and device for global automatic focusing of infrared images
  • A method and device for global automatic focusing of infrared images

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[0045] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0046] figure 1 A schematic flow diagram of a global infrared image autofocus method of the present invention is shown, and the detailed steps of the present invention are introduced below:

[0047] Such as figure 1 As shown, in step A, detail enhancement is performed on each frame of the acquired original infrared image. The bilateral filtering method is used to separate the high-frequency detail layer and the low-frequency background layer of the image in the spatial domain.

[0048] Since the bilateral filtering process has the characteristics of protecting the image edge, the edge contour in the background layer can be preserved to the greatest extent, while there are only weak and high-frequency changing image text...

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Abstract

The invention relates to a focusing method and device, which belong to the technical field of image processing, and in particular to a global automatic focusing method and device for infrared images. The present invention introduces digital image detail enhancement technology before image focusing, improves the details of infrared images, and proposes a simplified and efficient maximum gradient evaluation method, which can effectively improve the effectiveness of focusing evaluation. At the same time, before focusing stops, the introduction of The proportion coefficient of clear images reduces the probability of focus falling into a local maximum position, so that the present invention can be applied to global infrared image autofocus without selecting a focus frame.

Description

technical field [0001] The invention relates to a focusing method and device, which belong to the technical field of image processing, and in particular to a global automatic focusing method and device for infrared images. Background technique [0002] Autofocus technology is a dedicated technology in imaging systems. [0003] According to the knowledge of optical geometry, the imaging object has an optimal imaging position in the photoelectric imaging system. If the imaging plane deviates from this optimal imaging position, the image formed on it will be blurred, and the imaging quality will be significantly reduced. Therefore, accurate focusing of the optical lens is extremely important for the imaging system. It will directly determine the imaging quality of the image and the effectiveness of subsequent image processing and application. [0004] The focal length setting in the imaging system can be adjusted manually to focus, but the manual focusing process takes a long...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/232G06T5/00
CPCG06T5/003G06T2207/10048G06T2207/20028H04N23/67
Inventor 林晓
Owner BEIJING AEROSPACE FUDAO HIGH TECH
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