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Today's Topics:
1. Re: Suggestion for IP CAM (Roger Heflin)
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Message: 1
Date: Mon, 12 Jul 2021 10:27:10 -0500
From: Roger Heflin <roger.hef...@gmail.com>
To: Motion discussion list <motion-user@lists.sourceforge.net>
Subject: Re: [Motion-user] Suggestion for IP CAM
Message-ID:
<CAAMCDefhh8xVbv0qrneFM-i65Pd5Hf3=y==m3=ypnano13t...@mail.gmail.com>
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Stacking is simple when the movement in your images are shifting
consistently at the same rate in the same direction.
Binning must still be a bit worse than having 4x the pixels (probably
because of the loss at the pixel edges, and you still have fewer level
resolution with 4 bins vs 1bin, ie with 4 bins I may only have a few
usable levels for the given low light, were with a 4x bigger bin a
similar technology would have 4x the bins and more levels. ). Sony
makes 61M, 24M and 12M full frame sensors. If binning a 61M to get a
15.25M image was as good as a true 12M full frame sensor I don't
believe they would still be making one currently.
And I don't believe motion does either currently. The stacking
scheme does not work well with unpredictable motion. And the binning
won't help once you get the gain turned as high as you can without
getting significant noise as in low light you will have limited A/D
converter levels in the range being used. The 4x area sensor will
have 4x the A/D converter levels with the same gain in the range being
used.
On Sun, Jul 11, 2021 at 3:01 AM Martin Davies <mar...@savcom.co.uk> wrote:
>
> That's true, Roger, but coming from an astrophotography hobby, there are
> techniques you (Motion?) can use to improve performance. One technique is
> 'binning' which groups pixels together. This lowers the resolution but
> increases low light performance. Another is a technique known as stacking,
> where you combine frames to improve the image in low light.
>
> Best wishes
> Martin Davies
> On 11 Jul 2021, at 00:58, Roger Heflin <roger.hef...@gmail.com> wrote:
>>
>> Something else to note, the higher the resolution almost always means
>> worse low light performance (given the same sensor technology), so if
>> you need low light you may want to reconsider 4k cams, or you may want
>> to use a mixture.
>>
>> 1/2 the pixels with the same sensor size gets 2x the light and works
>> better at night. And almost all of the security cam type devices have
>> roughly the same sensor size.
>>
>> On Sat, Jul 10, 2021 at 10:10 AM S Andreason <sandrea...@gmail.com> wrote:
>>>
>>>
>>> Hi Markus,
>>> Check the camera's video encoding setting, H264 uses less CPU to decode
>>> than H265/HEVC.
>>> and of course, the higher the resolution, the slower things will go.
>>>
>>>
>>> Markus Tobatz wrote:
>>>>
>>>> RTSP stream in FullHD and that resulted in 90% CPU usage just for
>>>> that one camera)
>>>
>>>
>>>
>>>
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>>
>>
>>
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>
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