(meteorobs) Optimized filters for...Simple explanation.

[Larry]

Explanation briefly. We cannot use a fixed pixel threshold point with 
changing sunlight.

YCSentinel


----- Original Message ----- 
From: "Larry" <ycsentinel at att.net>
To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
Sent: 2009/05/25 18:49
Subject: Re: (meteorobs) Optimized filters for daytime fireball 
videocapture?


> Thomas,
>
> In my attempts to do just that about 2 years ago I ran into a number of
> problems besides  sunlight issues, artifacts, & band filtering issues.
>
> For us to attempt daylight capture of fireballs whether all-sky or not, 
> the
> larger issues were control of contrast, brightness, & threshold. 
> ESPECIALLY
> pixel threshold for trigger.
>
> We would need an AUTOMATIC software function which would readjust pixel
> threshold at frequent intervals throughout the day. Also the camera then
> becomes more sensitive to DARK FLIGHT than bright flight when operated in
> daylight modes.
>
> Notice what your "Test Video" is doing during daylight......nothing! It
> would take a nuclear blast to trigger it essentially. Then start 
> readjusting
> pixel threshold and all your basic brightness & contrast setting two where
> you start getting a threshold count in "Test Video" during any part of the
> day......
>
> It will be so far away from your night settings that you would have to 
> reset
> everything for ANY night captures in addition to your all-day constantly
> changing your settings for a fireball with changing sunlight blossuming of
> substrate pixels.
>
> I see no solution at the present time, or before, even with attempts to
> lollypop the sun itself.
>
> YCSentinel
> (jumping in quickly)
>
>
> ----- Original Message ----- 
> From: "Thomas Ashcraft" <ashcraft at heliotown.com>
> To: "Global Meteor Observing Forum" <meteorobs at meteorobs.org>
> Sent: 2009/05/25 08:13
> Subject: (meteorobs) Optimized filters for daytime fireball video capture?
>
>
>>I am wondering if anyone has experimented with infrared or any other
>> special optical filters that would be *optimum* for detecting daytime
>> fireballs? I am wondering if a filter could be made specifically for the
>> wavelengths of meteor burn signatures so as to make the meteors visible
>> in the midst of a bright daylight sky?
>>
>> I have used a red filter for my own all-sky video camera and have tried
>> to detect daytime fireballs at times of forward scatter radio receptions
>> when I knew that fireballs were above in my local daylight sky but I
>> have been unsuccessful at distinguishing any meteors thus far. Hence, I
>> wonder at filter and wavelength optimization.
>>
>> Has this been worked on?
>>
>> Thanks in advance for any information or thoughts on the subject.
>>
>> Thomas Ashcraft  /  New Mexico
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