Figure 10

SigShrink denoising for an ultrasonic image of breast cancer. The SWT with four resolution levels and the biorthogonal spline wavelet with order 3 for decomposition and with order 1 for reconstruction ("bior1.3" in Matlab Wavelet toolbox) are used. The noise standard deviation is estimated by the MAD normalized by the constant 0.6745 (see [4]).