Abstract
Laser active imaging technology has important practical value and broad application prospects in military fields such as target detection, radar reconnaissance, and precise guidance. However, factors such as uneven laser illuminance, atmospheric backscatter, and the imaging system itself will introduce noise, which will affect the quality of the laser active imaging image, resulting in image contrast decline and blurring image edges and details. Therefore, an image denoising algorithm based on homomorphic filtering and total variation cascade is proposed in this paper, which strives to reduce the noise while retaining the edge features of the image to the maximum extent. Firstly, the image type is determined according to the characteristics of the laser image, and then the speckle noise in the low-frequency region is suppressed by adaptive homomorphic filtering. Finally, the image denoising method of minimizing the total variation is adopted for the impulse noise and Gaussian noise. Experimental results show that compared with separate homomorphic filtering, total variation filtering, and median filtering, the proposed algorithm significantly improves the contrast, retains edge details, achieves the expected effect. It can better adjust the image brightness and is beneficial for subsequent processing.
Highlights
The sensitivity of intensified charge-coupled devices (ICCDs), atmospheric turbulence, laser energy, structural characteristics of the receiving optical system, and non-uniformity of the illumination will all affect the quality of a laser image
According analysis of the58.1435 characteristics 45.0113 of the laser image, it can be 43.0269 known that the image quality of the laser active imaging system is affected by various factors, which will cause the signal
An adaptive enhancement algorithm is used for images taken in According to the analysis of the characteristics of the laser image, it can be known that the image different time periods
Summary
The sensitivity of intensified charge-coupled devices (ICCDs), atmospheric turbulence, laser energy, structural characteristics of the receiving optical system, and non-uniformity of the illumination will all affect the quality of a laser image. Imagethe denoising the low-frequency reduced high-frequency is and enhanced, so as to remove speckle method with total variation minimization is used, and the edgeand features of the image are preserved noise and improve the contrast of the image; for impulse noise. The process proposed is asare follows: firstly, method with totalduring variation minimization is used, and of thethe edge featuresalgorithm of the image preserved to is homomorphically filtered, the contrast improved, the speckle of thefirstly, laser the image maximum during noise reduction. The background has miscellaneous flashimages due to obtained the influence of paper are divided into two types, one is the image with a concentrated distribution of brightness sunlight, and the brightness value distribution is relatively uniform. The size of the c value is adaptively selected
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