DocumentCode :
1661457
Title :
An investigation into aliasing in images recaptured from an LCD monitor using a digital camera
Author :
Muammar, Hani ; Dragotti, Pier Luigi
Author_Institution :
Electr. & Electron. Eng. Dept., Imperial Coll. London, London, UK
fYear :
2013
Firstpage :
2242
Lastpage :
2246
Abstract :
With current technology, high quality recaptured images can be created from soft displays, such as an LCD monitor, using a digital still camera and professional image editing software. The task of verifying the ownership and past history of an image is, consequently, more difficult. One approach to detecting an image that has been recaptured from an LCD monitor is to search for the presence of aliasing due to the sampling of the monitor pixel grid. To validate this approach, an investigation into the aliasing introduced in a digitally recaptured image is conducted. An anti-forensic method for recapturing images that are free from aliasing is developed using a model of the image acquisition process. This is supported by a simulation of the acquisition process and illustrated with examples of recaptured images that are free from aliasing.
Keywords :
image sampling; LCD monitor; aliasing; anti-forensic method; digital camera; digital still camera; image acquisition process; image ownership verification; image past history verification; images recapturing; monitor pixel grid sampling; professional image editing software; soft displays; Digital cameras; Image color analysis; Image sensors; Lenses; Monitoring; Noise; Bayer CFA; digital camera; forensic imaging; recapture;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing (ICASSP), 2013 IEEE International Conference on
Conference_Location :
Vancouver, BC
ISSN :
1520-6149
Type :
conf
DOI :
10.1109/ICASSP.2013.6638053
Filename :
6638053
Link To Document :
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