amplify filter, threshold option

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amplify filter, threshold option

Michael Koch
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.

Michael
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Re: amplify filter, threshold option

Paul B Mahol
On 2/17/19, Michael Koch <[hidden email]> 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.

>
> Michael
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Re: amplify filter, threshold option

Michael Koch
Am 17.02.2019 um 22:12 schrieb Paul B Mahol:
> On 2/17/19, Michael Koch <[hidden email]> 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.

Michael

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Re: amplify filter, threshold option

Paul B Mahol
On 2/17/19, Michael Koch <[hidden email]> wrote:

> Am 17.02.2019 um 22:12 schrieb Paul B Mahol:
>> On 2/17/19, Michael Koch <[hidden email]> 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.

Done.
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Re: amplify filter, threshold option

Michael Koch
Am 22.02.2019 um 23:37 schrieb Paul B Mahol:

> On 2/17/19, Michael Koch <[hidden email]> wrote:
>> Am 17.02.2019 um 22:12 schrieb Paul B Mahol:
>>> On 2/17/19, Michael Koch <[hidden email]> 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.
> Done.

Thank you! I'm just testing it.

Michael

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