Image Denoising Using Discrete Orthonormal S-Transform

S-transform is an effective time-frequency analysis technique, which can provide simultaneous time and frequency distribution information similar to the wavelet transform (WT). Discrete orthonormal S-transform (DOST) can reduce the redundancy of S-transform further. We introduce the ideas of wavelet transform-based image denoising into DOST domain and propose the soft-thresholding-based image denoising method using DOST. Simulations and the application in myocardial contrast echocardiography (MCE) image denoising illustrate the good performance of the proposed method and its application prospects.