On 5/10/09 4:26 PM, "Magnus Danielson" <mag...@rubidium.dyndns.org> wrote:
> Lux, James P skrev:
>>
>>
>> On 5/10/09 12:15 PM, "Brooke Clarke" <bro...@pacific.net> wrote:
>>
>>> Hi James:
>>>
>>> You might want to get a KIWI-OSD, Video overlay of GPS precision time
>>> stamp. It adds HH:MM:SS EEEE OOOO FFFFFF at the bottom of the image and
>>> so can be seen in every field. They have also developed a way to
>>> calibrate the camera shutter in relation to the frame time by using a
>>> number of LEDs. The main use if for star occulation timing.
>>> http://www.geocities.com/kiwi_36_nz/kiwi_osd/kiwi_osd.htm
>>>
>>> Have Fun,
>>>
>>> Brooke Clarke
>>
>> Yes, but that requires getting access to the video stream, which isn't easy
>> in a "camcorder" environment. Separate video recorders actually cost more
>> than camcorders.
>
> What precision of anything do you need?
>
> Expect 50-100 ppm oscillators in there.
>
Yes, but probably fairly good in the short run, and if you were recording
almost any sync signal (e.g. The 1kHz sine) you could calibrate that out.
>
>
>
> Recorded material is compressed. Consider how that affects your readout.
> Recorded material is said progressive/interlaced. This may not reflect
> how the CCD is snapshot and readout. You may not have the expected 1125
> or 750 lines per frame, and exactly what frame rate do you have?
I think that's something they'll need to experiment with...
Jim
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