Method and device for detecting ultra-low contrast targets with exponential fluctuation of light index

By constructing the energy index and calculating second-order photon coherent fluctuations, the problem of infrared detection failure under extremely low contrast conditions was solved, and a physical correlation between the spectral domain and the quantum statistical domain was realized, improving the accuracy and applicability of target detection.

CN121580086BActive Publication Date: 2026-07-03AEROSPACE INFORMATION RES INST CAS
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Patent Information

Application Number
CN202610100378.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-26
Publication Date
2026-07-03
Estimated Expiration
2046-01-26

AI Technical Summary

Technical Problem

Existing infrared detection technologies struggle to effectively detect targets under extremely low contrast conditions where the temperature difference between the target and the background is minimal and the emissivity difference is slight. Traditional methods, which rely on radiation intensity or photon counting, cannot fully utilize the quantum statistical and spectral distribution characteristics of photon flux, leading to detection failure.

Method used

An energy-photon index is constructed to quantify the difference in energy-photon distribution between the mid-wave infrared and long-wave infrared bands. Based on the energy-photon index, spatial domain screening is performed to generate candidate target regions. Second-order photon coherent fluctuations are calculated and fluctuation enhancement factors are calculated. Quantum statistical identification is then performed to output target detection results.

Benefits of technology

Under extremely low contrast conditions, this method overcomes the limitations of traditional detection methods by integrating spectral energy distribution and quantum fluctuation information in a dual-dimensional detection approach, achieving accurate target detection applicable to fields such as aerospace and national defense security.

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Abstract

The application provides a method and device for detecting an ultra-low contrast target with exponential fluctuation of light, which can be applied to the fields of computational optical imaging, infrared detection, target identification and tracking. The method comprises the following steps: constructing an energy-light index, which is used to quantify the energy-photon distribution difference in the mid-wave infrared and long-wave infrared bands; based on the energy-light index, performing spatial domain screening on a dual-band infrared image to generate a candidate target region; based on the time sequence data of the energy-light index of the candidate target region, calculating the second-order photon coherent fluctuation of the candidate target region, which represents the time fluctuation of the photon number correlation; based on the second-order photon coherent fluctuation, calculating a fluctuation enhancement factor; and based on the fluctuation enhancement factor, performing quantum statistical identification to output a target detection result. This method can accurately detect targets in the case of extremely small temperature difference between the target and the background, subtle emissivity difference and spectral camouflage.
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