High dynamic range adaptive adjustment method for infrared thermal imager

An infrared thermal imager, high dynamic range technology, applied in the field of self-adaptive adjustment, can solve problems such as difficult to adapt to changing scenes, fixed dynamic range, etc., to achieve the effect of optimizing imaging effect and avoiding abnormal imaging

Active Publication Date: 2018-06-05
BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH +1
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Problems solved by technology

[0009] The purpose of the present invention is to provide an adaptive adjustment method for the high dynamic range of an infrared thermal imager, which

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  • High dynamic range adaptive adjustment method for infrared thermal imager

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[0021] A method for self-adapting high dynamic range of an infrared thermal imager includes the following steps:

[0022] S1: Parameter collection; use high-precision area source blackbody 2 as a standard reference source, and use a cooling staring infrared thermal imager 1 for normal imaging and output digital video. High-precision area source blackbody 2 temperature can be adjusted, cooling type staring infrared thermal imager 1 integration time can be switched among multiple settings, the upper computer 3 processing program can store the current image image gray average value and central area average value in real time , So as to obtain the original data corresponding to the gray value response of the digital image under different external radiation conditions and different integration times.

[0023] S2: Data processing; firstly, establish the relationship between the response of the refrigerated staring infrared thermal imager 1 and the external radiation under different integ...

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Abstract

The invention discloses a high dynamic range adaptive adjustment method for an infrared thermal imager. The method comprises a first step of parameter acquisition in which a high accuracy area sourceblackbody is used as a standard reference source, a refrigeration-type staring infrared thermal imager is used for normal imaging and a digital video is outputted, the temperature of the high accuracyarea source blackbody is adjustable, and the integration time of the refrigeration-type staring infrared thermal imager can be switched among multiple stages of set values, a second step of data processing in which the relationship between a response and external radiation under different integration time of the refrigeration-type staring infrared thermal imager is firstly built, and then, an integration time switching logic and a threshold are designed, a third step of multi-section two-point calibration in which the area source blackbody is used to offline use a general two-point calibration algorithm to calculate and obtain a correction gain value and an offset value under different integration time stages, and a fourth step of real-time optimization in which the integration time switching logic and the threshold algorithm in the second step form a program in a programmable FPGA hardware development mode and are solidified into an imaging circuit.

Description

Technical field [0001] The technology belongs to the field of adaptive adjustment, and specifically relates to an adaptive adjustment method for a high dynamic range of an infrared thermal imager. Background technique [0002] Infrared imaging technology is a technology that converts the difference in infrared radiation generated by the temperature or emissivity of each object surface in the target field of view into a visible image. In the military field, infrared imaging is widely used in the search, sighting, reconnaissance, identification and tracking of military targets; surveillance, warning, early warning and tracking of long-range, medium- and short-range military targets; precision guidance of infrared imaging; weapon platforms Driving and navigation; detecting stealth weapon systems, conducting photoelectric countermeasures, etc. [0003] The energy conversion process involved in infrared imaging detection is: after optical energy is converged by the optical system, it e...

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Application Information

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IPC IPC(8): G01J5/00
CPCG01J5/00G01J2005/0077G01J5/80
Inventor 董斐刘晗傅强林森
Owner BEIJING AEROSPACE INST FOR METROLOGY & MEASUREMENT TECH
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