Figure 7
From: Spectral subtraction denoising preprocessing block to improve P300-based brain-computer interfacing
Block accuracy results for different denoising methods vs. the original signal for sample cases. Block accuracy results for different cases representing original signal (no denoising), spectral subtraction denoising, and wavelet shrinkage denoising for subject 1, 2, 7 and 9. The horizontal axis represents the number of blocks used to estimate the selection while the vertical axis represents the block accuracy reached.