SaVE: sensor-assisted motion estimation for efficient h.264/AVC video encoding
MM '09 Proceedings of the 17th ACM international conference on Multimedia
Proceedings of the 22nd international workshop on Network and Operating System Support for Digital Audio and Video
Seeing is not believing: visual verifications through liveness analysis using mobile devices
Proceedings of the 29th Annual Computer Security Applications Conference
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Accelerometers have appeared on many camcorders, cameras and mobile phones. We present algorithms that estimate camera movement from accelerometer readings and apply the estimation to significantly improve the compute-intense motion estimation in video encoding. We have implemented a working prototype that simultaneously captures video and three-axis acceleration data. The video is then compressed with a reference MPEG-2 encoder, modified to incorporate the accelerometer readings to assist motion estimation. Our experimental data shows a two to three times speed improvement for the entire encoding process, in comparison with full search.