Erwin J. Alles

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In this paper, we propose a method to exploit Photo Response Non-Uniformity (PRNU) to identify the source camera of heavily JPEG compressed digital photographs of resolution 640×480 pixels. Similarly to research reported previously , we extract the PRNU patterns from both reference and questioned images using a two-dimensional high-pass filter and compare(More)
In biomedical all-optical pulse-echo ultrasound systems, ultrasound is generated with the photoacoustic effect by illuminating an optically absorbing structure with a temporally modulated light source. Nanosecond range laser pulses are typically used, which can yield bandwidths exceeding 100 MHz. However, acoustical attenuation within tissue or(More)
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