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I have a video from a security cam, and the video is not good enough and I can't see the number of a car, is there some software that could help me with that ?

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In brief, it's not possible to extract more information from the video than is already there (the CSI effect - "ENHANCE!"). However, if the video is suffering from a particular kind of artefact (i.e. severe blockiness) then you might try some post-processing filters. Check out VLC in the first instance and experiment with its post-processing.

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Don’t forget “zoom in; clear it up!” :-) – Synetech Sep 8 '11 at 5:53

In Hollywood creating missing pixels is done in movies, but in real life once a pixel is gone it's gone forever.

Nevertheless, blurred movies can be visually sharpened, although this is mostly esthetical.
I will be surprised if it can help uncover the car number.

The free video editor program VirtualDub has many filters, some of which can be used to improve the quality of the video.

See also the VirtualDub MSU Smart Sharpen Filter, described as :

The filter allows to enhance image sharpness with minimum noise amplification.

Here is an example of what it can do:



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