Wavelet denoiser
Definition
A denoising filter that works in the wavelet transform domain, thresholding coefficients at each scale and direction to remove random noise while preserving edges. Used widely for PRNU extraction before BM3D became standard.
Related terms
- BM3D (Block-Matching 3D)
- A state-of-the-art denoising algorithm that groups similar image patches across the image, transforms them jointly, thresholds in the transform domain, and inverts....
- Hypothesis testing in camera attribution
- The framework in which H0 is 'the query image was not taken by this camera' and H1 is 'it was'. The PCE...
- NCC (Normalised Cross-Correlation)
- The standard measure of similarity between a query noise residual and a reference PRNU pattern. It produces a value between -1 and...
- Noise residual (W_hat)
- The per-image estimate of PRNU, computed by subtracting a denoised version of the image from the original. It contains PRNU plus random...
- PCE (Peak-to-Correlation Energy)
- A refined statistic that divides the peak of the cross-correlation surface by the energy of the non-peak region. PCE is more sensitive...
Explained in
- PRNU Extraction, Matching, and the PCE StatisticA denoising filter that works in the wavelet transform domain, thresholding coefficients at each scale and direction to remove random noise while preserving ed...