Multi-mode infrared imaging system and method facing weak target detection

一种红外成像系统、红外成像的技术，应用在遥感探测领域，能够解决无法适应大动态范围辐射或散射场景等问题，达到最佳识别效果、提高能力、提高成像信噪比的效果

Active Publication Date: 2016-05-25
NANJING HUATU INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides a multi-modal infrared imaging system and method for weak target detection, the purpose of which is to solve the problem that the existing infrared remote sensing detection system cannot adapt to large dynamic range radiation or scattering scenarios The problem

Method used

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  • Multi-mode infrared imaging system and method facing weak target detection
  • Multi-mode infrared imaging system and method facing weak target detection
  • Multi-mode infrared imaging system and method facing weak target detection

Examples

Experimental program
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Effect test

Embodiment 1

[0061] In Example 1, the light field f of the entrance pupil I T(x,y,λ,t) and F in (x,y,λ,t) b (x, y, λ, t) are in the linear part of the response curve of the infrared imaging sensor;

[0062] and 0.1*F b (x,y,λ,t)b (x,y,λ,t);

[0063] The multimodal infrared imaging method for weak target detection provided in Embodiment 1 is as follows:

[0064] (1) The light field f of the entrance pupil I (x, y, λ, t) for reflection and gathering;

[0065] Among them, f I (x,y,λ,t)=T(x,y,λ,t)+F b (x, y, lambda, t);

[0066] Among them, T(x, y, λ, t) is the energy of the radiation or scattered light field of the detected target, F b (x, y, λ, t) is background radiation or scattered light field energy; F b (x, y, λ, t) has a large range of light field intensity changes, and its schematic diagram is as follows image 3 Shown; Wherein, λ is imaging wavelength, (x, y) is space coordinate, t is time;

[0067] (2) The light after reflection and gathering is processed by the adjustable...

Embodiment 2

[0069] Embodiment 2 is to use the multi-modal infrared imaging method for weak target detection provided by the present invention to detect weak targets under daytime conditions; the light field energy of the scene under daytime is generally strong, so it is necessary to adjust the receiving light field at the focal plane Energy integration time; steps (1)~(3) of this embodiment are identical with embodiment 1, and all the other steps are specifically as follows:

[0070] (4) Judging the light field f of the entrance pupil in daytime I T(x,y,λ,t) and F in (x,y,λ,t) b Whether (x, y, λ, t) is in the linear part of the infrared imaging sensor response curve, if so, then enter step (5); if not, then enter step (6);

[0071] (5) Compare the detection target light field T(x, y, λ, t) with the background light field F b (x, y, λ, t), if T(x, y, λ, t) is more than F b (x, y, λ, t) is 1 to 3 orders of magnitude smaller, indicating that the signal-to-noise ratio of the detection targ...

Embodiment 3

[0078] Embodiment 3 is to use the multi-modal infrared imaging method for weak target detection provided by the present invention to detect weak targets at night; the light field energy model of the night scene is as follows: Image 6 As shown, the whole is weak, and it needs to adjust the focal plane receiving light field energy integration time, the flow of this embodiment is as follows Figure 7 Shown, its steps (1)~(3) are identical with embodiment 1, and all the other steps are specifically as follows;

[0079] (4) Judging the light field f of the entrance pupil at night I T(x,y,λ,t) and F in (x,y,λ,t) b Whether (x, y, λ, t) is in the linear part of the infrared imaging sensor response curve, if so, then enter step (5); if not, then enter step (6);

[0080] (5) Compare the detection target light field T(x, y, λ, t) with the background light field F b (x, y, λ, t), if T(x, y, λ, t) is more than F b (x, y, λ, t) is 1 to 3 orders of magnitude smaller, indicating that the...

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Abstract

The invention discloses a multi-mode infrared imaging system and method facing weak target detection. The system is composed of an infrared optic window, a large-view-field two-dimensional scanning rotating mirror, a Cartesian reflector group, a broad-spectrum relay lens, a first lens group, an adjustable space variable-transmittance lens, a second lens group, an FPA module, a data processing module, and a space addressable transmittance modulation module. The data processing module generates a transmittance modulation control signal and an imaging integral time modulation signal according to an image data signal outputted by the FPA module; the adjustable space variable-transmittance lens adjusts a light field transmittance dynamically under the effect of the transmittance modulation control signal; and the FPA module adjusts the imaging integral time adaptively under the effect of the imaging integral time modulation signal. On the basis of adjustment, an imaging signal to noise ratio of a weak signal is improved. A target light filed and a background light field are adjusted to linear parts of an infrared imaging sensor response curve; and thus an objective that a weak target can be identified under the circumstances that the luminous flux is not sufficient or the luminous flux is too high.

Description

technical field [0001] The invention belongs to the technical field of remote sensing detection, and more specifically relates to a multi-mode infrared imaging system and method for weak target detection. Background technique [0002] In the scene of infrared remote sensing, the dynamic range of infrared radiation and scattering is very large, while the infrared sensor only has a limited dynamic range. When the weak target detected by remote sensing is in a complex background, the light field energy of the weak target is in the linear part of the response curve of the infrared imaging sensor, and the weak target is detectable when the signal-to-noise ratio is high enough; The light field energy of the weak target is in the shoulder of the response curve of the infrared imaging sensor, or in the shoulder of the response curve of the infrared imaging sensor, that is, in the nonlinear part of the response curve. If the response rate is very low, the weak target cannot be detect...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B27/00
CPCG02B27/00H04N23/60H04N3/09G02B13/14G02B17/0808G02B26/101H04N5/33H04N23/741H04N23/75H04N23/73H04N23/698
Inventor 张天序张新宇
Owner NANJING HUATU INFORMATION TECH
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