Auto-focusing method and device of thermal imager

A technology of automatic focus and thermal imager, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of unsuitable thermal imager, long adjustment process, and great influence on focusing accuracy, so as to enhance the convenience of use and reduce the Repeated manual operation, the effect of improving image quality

Active Publication Date: 2010-03-03
山东神戎电子股份有限公司
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Problems solved by technology

[0003] Because the infrared lens used in the thermal imager is made of different materials from the ordinary visible light lens, it is usually used to manually rotate the lens or manually control the DC motor to drive the lens to obtain a clearly focused image. This method takes a long adjustment process and the focus accuracy is subject to the subjective influence of the operator. Large; infrared thermal imaging reflec

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[0022] In order to clearly illustrate the technical features of the solution, the solution will be described below through a specific implementation manner.

[0023] An automatic focusing method for a thermal imager. The composite video signal output by an infrared detector outputs digital image data to a microprocessor through a video decoder, or the infrared detector outputs a high-precision digital signal to a microprocessor 2 through a deserializer. Processor 2 calculates the sharpness evaluation function value, and drives the motor to drive the infrared lens to move according to the change trend of the obtained sharpness evaluation function value. Long and precise positioning until the best focus position is found. When the microprocessor 2 calculates the sharpness evaluation function value, firstly, the image is preprocessed for the selected focus area, and the difference template operator is used to detect the edge gray level change, and the edge gradient value is thres...

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Abstract

The invention discloses an auto-focusing method and a device of a thermal imager, belonging to the technical field of infrared image processing. In the invention, a compound video signal output by aninfrared detector outputs digital image data to a microprocessor by a video decoder, or an infrared detector outputs a high-precision digital signal to a microprocessor by a deserializer, the microprocessor calculates definition evaluation functional values, and a motor is driven to drive an infrared lens to move to an optimal focusing position according to the variation trend of the obtained definition evaluation functional values. The method and the device have the advantages that the microprocessor can exactly and rapidly find out the optimal focusing position, reduce the repeated manual operation and manual intervention and improve the imaging quality and the convenience.

Description

technical field [0001] The invention relates to an automatic focusing device of a thermal imager, belonging to the technical field of infrared image processing. Background technique [0002] Obtaining a clear image is the most basic requirement of various digital imaging equipment. There is a set of focusing lenses in the multi-group lenses of the camera lens. The focusing purpose can be achieved by changing the position of the focusing group lenses. Automatic focusing can replace manual completion of this process. This saves a lot of time and improves image quality. Autofocus can be divided into active and passive types. Active autofocus is to measure the distance of the subject by emitting infrared rays or ultrasonic waves, and use a certain mathematical model to calculate the best focus position. This method requires additional distance measuring equipment and has a relatively small scope of application. The passive method refers to the use of the acquired image’s own i...

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Application Information

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IPC IPC(8): G01J5/00
Inventor 陈玉花陈大明
Owner 山东神戎电子股份有限公司
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