Figure 17.

Results of the combined PCA-Wiener filtering for four different noisy projections with SNR = 8dB taken at $\theta =0,\frac{\pi }{4},\frac{\pi }{2}$, and $\frac{3\pi }{4}$. Top: Clean projection (blue) and the PCA denoising of the noisy projection (red). Bottom: Noisy projection (blue) its filtered version using PCA (red).