An auto-focusing noise suppressor for cellphone movies based on phase randomization and power compensation

This paper proposes an auto-focusing noise suppressor for cellphone movies based on phase randomization and power compensation. The input signal is analyzed in the frequency domain to detect and preserve important spectral components including peaks. All other components are suppressed to the background signal level that is estimated during absence of the important components. Residual spikes by auto-focusing noise are suppressed by phase randomization, which is not possible without phase manipulation. Power reduction by phase randomization is compensated for by an analytically obtained factor. Subjective evaluation results demonstrate that the proposed auto-focusing noise suppressor achieves a score of 1.0 in the 7-grade comparison MOS (CMOS) compared to the one without compensation with a statistically significant difference.