[FFmpeg-user] amplify filter, threshold option

Michael Koch astroelectronic at t-online.de
Sun Feb 17 23:25:46 EET 2019

Am 17.02.2019 um 22:12 schrieb Paul B Mahol:
> On 2/17/19, Michael Koch <astroelectronic at t-online.de> wrote:
>> The threshold option in the "amplify" filter suppresses large
>> differences. In my opinion it would make more sense to have a (second)
>> threshold option for suppressing small differences, for example noise. I
>> mean alter the source pixel only if the difference is greater than the
>> threshold value.
> The sole point of filter is usage in forensics to amplify small pixel changes in
> static video. But it could be added to filter, sure it would not hurt
> to extend its funcionality.

Sounds good. I have videos of the night sky and want to amplify fast 
moving objects, especially meteors. But I don't want to amplify the noise.


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