A method and system for air target detection based on noise suppression

Abstract

The invention discloses an air target detection method and system based on noise suppression, which includes: performing iterative space domain / frequency domain forward and reverse transformation on an input image, and processing in the corresponding space domain / frequency domain. Construct a frequency-domain low-frequency filter with adjustable parameters, remove the thermal radiation component of low spatial frequency in the frequency domain, and adjust the frequency-domain radius of the filter iteratively, use this filter to filter the frequency-domain image, and filter the filtering result Inverse Fourier transform, evaluate whether the local contrast of the inverse Fourier transform image reaches the maximum value, if it reaches the maximum value, then terminate the iteration, the result image retains the intermediate frequency target and high frequency noise; High-frequency filtering is performed in the domain to remove high-frequency noise components in the resulting image; non-linear enhancement is performed on the resulting image to highlight small targets for detection. The invention reduces the background interference of aerodynamic heat radiation and the high-frequency noise of the detector, and greatly improves the accuracy rate of detecting air targets in a high-heat environment.

Description

technical field [0001] The invention relates to the field of interdisciplinary science and technology combining aerospace technology and image processing, and more specifically, to a method and system for detecting aerial targets based on noise suppression. Background technique [0002] When the aircraft is flying at high speed in the atmosphere, the optical window of the navigation guidance of the aircraft is aerodynamically heated and is in a severe aerodynamic thermal environment. The shock layer and the optical window will generate noise due to the thermal radiation effect, thereby greatly reducing the image quality. Therefore, infrared The signal-to-noise ratio of the imaging detection system for target detection is reduced. And as the temperature of the window continues to rise, the grayscale of the image background enters a saturated state, making it difficult to respond to the radiation from the target. At the same time, since the images acquired under flight condit...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problem that the positioning and detection of various targets cannot be directly realized due to the interference conditions of the non-uniform strong background noise and the thermal radiation background in the air target detection technology

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