[FFmpeg-user] amplify filter, threshold option

Paul B Mahol onemda at gmail.com
Sat Feb 23 00:37:53 EET 2019

On 2/17/19, Michael Koch <astroelectronic at t-online.de> wrote:
> 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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