Hypothesis testing in camera attribution
Definition
The framework in which H0 is 'the query image was not taken by this camera' and H1 is 'it was'. The PCE or NCC value is compared to a threshold calibrated from empirical distributions of true and false matches, and a decision is made with stated false-positive and false-negative rates.
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....
- 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...
- Wavelet denoiser
- A denoising filter that works in the wavelet transform domain, thresholding coefficients at each scale and direction to remove random noise while...
Explained in
- PRNU Extraction, Matching, and the PCE StatisticThe framework in which H0 is 'the query image was not taken by this camera' and H1 is 'it was'. The PCE or NCC value is compared to a threshold calibrated from...