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Multidimensional joint nonuniformity correction method for infrared imaging system

A non-uniformity correction, infrared imaging system technology, applied in the field of infrared imaging, can solve problems such as large computational load, increased hardware overhead of imaging system, and impact on imaging quality.

Active Publication Date: 2018-11-23
KUNMING INST OF PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of technology has a large amount of calculation, and usually needs to calculate dozens or even hundreds of frames of images, which greatly increases the hardware overhead of the imaging system; and will cause "ghosting" phenomenon, affecting the image quality
Therefore, the current scene-based correction has not been effectively used in practical engineering applications

Method used

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  • Multidimensional joint nonuniformity correction method for infrared imaging system
  • Multidimensional joint nonuniformity correction method for infrared imaging system
  • Multidimensional joint nonuniformity correction method for infrared imaging system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] Such as figure 2 As shown, the method for multi-dimensional joint non-uniformity correction in the embodiment of the present invention specifically includes the following steps:

[0071] (1) Collect 3 corrected images for the black body (as a reference radiation source for uniform radiation), including: setting the black body temperature to T H , set the integration time to t C , collect the first corrected image D(T H ,t C ); keep the blackbody temperature T H , set the integration time to t 0 (t 0 C ), the second corrected image D(T H ,t 0 ); reduce the blackbody temperature to T L , set the integration time to t C , collect the third corrected image D(T L ,t C ); the gray value of the pixel (i, j) in these three images is

[0072] D. i,j (T H ,t C ) = t C ×[G i,j ×L(T H )+B i,j ]+[V×A i,j +O i,j ] (11)

[0073] D. i,j (T H ,t 0 ) = t 0×[G i,j ×L(T H )+B i,j ]+[V×A i,j +O i,j ] (12)

[0074] D. i,j (T L ,t C ) = t C ×[G i,j ×L(T ...

Embodiment 2

[0103] Such as Figure 4 As shown, the method for multi-dimensional joint non-uniformity correction in the embodiment of the present invention specifically includes the following steps:

[0104] (1) Collect 3 corrected images for the black body (as a reference radiation source for uniform radiation), including: setting the black body temperature to T H , set the integration time to t C , collect the first corrected image D(T H ,t C ); keep the blackbody temperature T H , set the integration time to t 0 (t 0 C ), the second corrected image D(T H ,t 0 ); reduce the blackbody temperature to T L , set the integration time to t 0 , collect the third corrected image D(T L ,t 0 ); the gray value of the pixel (i, j) in these three images is

[0105] D. i,j (T H ,t C ) = t C ×[G i,j ×L(T H )+B i,j ]+[V×A i,j +O i,j ] (25)

[0106] D. i,j (T H ,t 0 ) = t 0 ×[G i,j ×L(T H )+B i,j ]+[V×A i,j +O i,j ] (26)

[0107] D. i,j (T L ,t 0 ) = t 0 ×[G i,j ×L(T ...

Embodiment 3

[0138] Such as Figure 6 As shown, the method for multi-dimensional joint non-uniformity correction in the embodiment of the present invention specifically includes the following steps:

[0139] (1) Collect 3 corrected images for the black body (as a reference radiation source for uniform radiation), including: setting the black body temperature to T L , set the integration time to t C , collect the first corrected image D(T L ,t C ); keep the blackbody temperature T L , set the integration time to t 0 (t 0 C ), the second corrected image D(T L ,t 0 ); Raise the blackbody temperature to T H , set the integration time to t C , collect the third corrected image D(T H ,t C ); the gray value of the pixel (i, j) in these three images is

[0140] D. i,j (T L ,t C ) = t C ×[G i,j ×L(T L )+B i,j ]+[V×A i,j +O i,j ] (39)

[0141] D. i,j (T L ,t 0 ) = t0 ×[G i,j ×L(T L )+B i,j ]+[V×A i,j +O i,j ] (40)

[0142] D. i,j (T H ,t C ) = t C ×[G i,j ×L(T H ...

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Abstract

The invention relates to a multidimensional joint nonuniformity correction method for an infrared imaging system, which belongs to the technical field of infrared imaging. Multidimensional informationis obtained through different temperature and different integration time of a reference radiation source, a correction parameter is calculated for nonuniformity adaptive correction for working of theinfrared imaging system under different integration time. An image through actual target acquisition is subjected to base image deduction before correction, offset errors are eliminated automaticallyin real time, the imaging system does not need to use devices such as a shutter and a shield, and the nonuniformity can be effectively corrected under different environment and bias voltage conditions. The method requires less storage capacity and less computation, and is easy to be implemented by hardware. Moreover, only a set of correction parameters can be used to complete correction on targetimaging with different integration time, which has engineering practicability.

Description

technical field [0001] The invention belongs to the technical field of infrared imaging, and in particular relates to a multi-dimensional joint non-uniformity correction method for an infrared imaging system. Background technique [0002] The uneven distribution of images in space will seriously affect the performance of the infrared imaging system and adversely affect its use. Therefore, non-uniformity correction is required to meet the actual use requirements. The non-uniformity of the infrared imaging system mainly comes from the non-uniformity of the infrared detector response, the non-uniformity of the electronic device of the readout circuit, and the non-uniformity introduced by the optical system and interconnection. Among them, the infrared detector and the readout circuit are the most important sources of non-uniformity. [0003] There are two main categories of non-uniformity correction techniques: reference radiation source-based non-uniformity correction and sce...

Claims

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Application Information

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IPC IPC(8): G01J5/00
CPCG01J5/00G01J5/80
Inventor 陈楠姚立斌张济清钟昇佑李正芬毛文彪韩庆林
Owner KUNMING INST OF PHYSICS
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