Extract Audio from Video
"The method uses an image-matching process based on vibration from sound waves."
Scientists have discovered a
simple optical technique to recover spoken words from just a video recording of
objects in the room.
"The technique
may find applications such as the passive detection of conversations inside of
a building from a far distance," said one of the study authors Zhaoyang
Wang from the Catholic University of America in the US.
"The paper
shows that the sound creates minute vibrations in objects and that these
vibrations — given the right equipment — can be picked up from a video
signal," said Reiner Eschbach, associate editor of the journal Optical
Engineering that published the paper.
The technique is
based on the fact that sound waves are mechanical waves that cause air to
vibrate when travelling.
That vibration
through air can cause vibration of objects located in its travelling path,
especially if the objects are lightweight, thin and flexible such as a piece of
paper.
The vibrations,
although usually with small amplitudes, can be detected and analyzed algorithmic-ally and audio reconstructed based on those calculations.
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