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Contribution of Non-Scrambled Chroma Information in Privacy-Protected Face Images to Privacy Leakage. Presentation given at the 10th International Workshop on Digital Forensics and Watermarking (IWDW'11).
Note that a more extensive objective and subjective study of privacy protection in video surveillance systems can be found in the following book chapter:
H. Sohn, D. Lee, W. De Neve, K.N. Plataniotis, and Y.M. Ro. An objective and subjective evaluation of content-based privacy protection of face images in video surveillance systems using JPEG XR. Effective Surveillance for Homeland Security: Balancing Technology and Social Issues. CRC Press / Taylor & Francis. May 2013. pp. 111-140.