  This communication is about an application of image forensics where we use
camera sensor fingerprints to identify source camera (SCI: Source Camera
Identification) in webcam videos. Sensor or camera fingerprints are based on
computing the intrinsic noise that is always present in this kind of sensors
due to manufacturing imperfections. This is an unavoidable characteristic that
links each sensor with its noise pattern. PRNU (Photo Response Non-Uniformity)
has become the default technique to compute a camera fingerprint. There are
many applications nowadays dealing with PRNU patterns for camera identification
using still images. In this work we focus on video, more specifically on webcam
video, because of the great importance of webcam video nowadays. Three possible
methods for SCI are implemented and assessed in this work.
