Stripe noise removal method for infrared imaging system

An infrared imaging system and stripe noise technology, which is applied in the parts of TV system, image communication, TV, etc., can solve the problem of image high-frequency information loss, etc., and achieve the effect of removing noise, retaining image details, and avoiding blindness

Active Publication Date: 2015-04-29
SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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Problems solved by technology

For these traditional infrared image noise reduction processing methods, they do not pay attention to the mechanism of noise generation, but simply consider the noise, which will lead to the loss of high-frequency information of the image

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  • Stripe noise removal method for infrared imaging system
  • Stripe noise removal method for infrared imaging system
  • Stripe noise removal method for infrared imaging system

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0026] Such as figure 1 , taking the infrared imaging system based on the 320×256 focal plane output by the 4-way readout circuit as the hardware as an example, the improved method for removing streak noise in the infrared system includes the following steps:

[0027] 1) Use the system to image a uniform black body. Arranging the obtained image pixels into one dimension according to the output sequence of the four-way readout circuit in the order of 1, 2, 3, and 4 in time, to obtain an I(N) sequence. 320 is the number of columns.

[0028] 2) Perform FFT transformation on the one-dimensional discrete data obtained in 1) with a sampling frequency of 81920:

[0029] F=FFT(I(N))

[0030] W=abs(F)

[0031] Among them, FFT () represents the fast one-dimensional Fourier tr...

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Abstract

The invention discloses a stripe noise removal method for an infrared imaging system. The method includes the following implementation steps that first, a black body is imaged through the infrared imaging system, and an obtained infrared image is converted into a one-dimensional number sequence; second, FFT is performed on the obtained one-dimensional number sequence; third, a spectral line representing stripe noise in a spectrogram after transformation is calibrated; fourth, the result of the image which is also converted into the one-dimensional number sequence, is about to be denoised and has been subjected to FFT is processed at the position of the calibrated spectral line; fifth, inverse transformation is performed on the processed result so that the one-dimensional number sequence can be obtained, and then the two-dimensional image is formed through splicing. The method overcomes the defects of a traditional infrared image noise removal method, and is more effective and more accurate. Through the method, stripe noise in the infrared image can be effectively removed, loss of original information of the image is avoided, and the high-quality restoration image is obtained.

Description

Technical field: [0001] The invention belongs to the technical field of high-sensitivity infrared imaging and its application, is based on a refrigeration-type infrared imaging hardware system, and relates to the removal of stripe noise in infrared images of Fourier transform. Background technique: [0002] With the development of infrared imaging technology, people have higher and higher requirements for the sensitivity level of thermal infrared imaging system, and the demand for obtaining high-sensitivity and high-resolution infrared images is more urgent. Infrared images after simple non-uniformity correction can no longer meet high In order to meet the needs of sensitive occasions, it is necessary to perform denoising processing on the infrared image in order to improve the sensitivity level of the infrared image. High-sensitivity infrared imaging systems generally use cooled infrared focal plane devices, which are composed of pixels arranged in a matrix and peripheral r...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N5/33H04N5/217
Inventor 姬弘桢王建宇李春来金健周潘伟
Owner SHANGHAI INST OF TECHNICAL PHYSICS - CHINESE ACAD OF SCI
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