Home About Us Laboratory Services Forensic Science Communications Back Issues January 2009 research Figure 11: Correlation of noise from c10 with 11...

Figure 11: Correlation of noise from c10 with 11 reference patterns

Figure 11: Correlation of noise from c10 with 11 reference patterns

Correlation of noise from c10 with 11 reference patterns

This figure depicts the correlation of pattern noise in images from camera c10 with 11 reference patterns. The correlation values with camera c10’s reference pattern are depicted using small teal stars. Correlations, rho, are displayed on the y-axis, while the index of the image being correlated is displayed on the x-axis. The pattern is depicted as a smattering of the symbols, which range from .11 on the y-axis and 1 on the x-axis to .08 on the y-axis and approximately 250 on the x-axis. The correlations with camera c10’s reference pattern are centered on approximately 0.12 for the first 200 images (1 through 200 on the x-axis) because these images were also used to generate the reference pattern. For this camera, even the remaining images, 201 through 250, have similar correlation values. All of these correlation values are significantly greater than the correlation values with other camera reference patterns. The average classification accuracy is 100 percent. The images having the smallest correlation with camera c10’s reference pattern (such as approximately 115 on the x-axis) are again those of the night sky or similarly dark scenes. Camera c10 is a Panasonic DMC FZ4.