Local directional denoising
Sofia C. Olhede, Andrew T. Walden · IEEE Transactions on Signal Processing · 2005
Denoising of complex-valued signals involves the relationships between the real and imaginary parts of the signal. The authors introduce the idea of local directional thresholding, well-suited to signals that are bidirectional overall but unidirectional at any one time, such as Doppler ultrasound, and show its efficacy on synthetic and real data.