Underwater sonar image denoising method based on dual-tree complex wavelet transform and PCA
A dual-tree complex wavelet and underwater sonar technology, applied in the field of image processing, can solve problems such as unsatisfactory processing effects
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[0059] The present invention is described in more detail below in conjunction with accompanying drawing example:
[0060] combine Figure 1~5 , the specific steps are:
[0061] (1) Apply dual-tree complex wavelet transform to an underwater sonar image, and transform the image from space domain to complex wavelet domain.
[0062] (2) Keep the low-frequency approximate components of the image obtained after three-layer dual-tree complex wavelet transform unchanged.
[0063] (3) Process the high-frequency components of the image. The PCA method is used to estimate the energy of the noise in the high-frequency sub-band, so as to determine the threshold and use the hard threshold function to process the complex wavelet coefficients.
[0064] (4) Inverse dual-tree complex wavelet transform is performed on the processed complex wavelet coefficients to obtain the final image after denoising.
[0065] The core content of the present invention is to use dual-tree complex wavelet tra...
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Abstract
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