Beware Imager vs Stream Resolution
By: Ethan Ace, Published on Sep 10, 2015
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Comments (10)
Alexander Ryltsov
Thank you Ethan for pointing this topic!
Question: are there panoramic cameras with, for example, 5MP sensor (quite typicall now), but with only 2MP stream (panoramic or de-warped soft PTZ)?
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Mike Weymer
I have a mix of the geovision FE and Vivotek FE cameras, and have verified the above statement. I battled this on install but gave up on it...so I have to wonder if these 5mp FE cams are only putting out 3mp, if you buy the 3mp fe, will the image be scaled again or will it be 3mp.
Heres a snapshot of Geovision software stating the actual size of 1920*1920, the camera is a vivotek being ran on the geovision platform.
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Undisclosed #1
1920x1920 = 3.7MP
And even that number is deceiving, the effective pixels are actually more like 2.9MP.
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Undisclosed #1
Ethan, do any of these new panoramics have lens options that might change the image circle, and therefore the amount of wasted pixels? I think I have a Mobotix that does, but it's old.
Off-topic, but I have to ask, what is all the debris and downed signage in the middle of the street? Was there an accident or a wind storm?
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Ethan Ace
The intersection where we were shooting is pretty infamous here. The road to the right leads to what was supposed to be a shopping center but it was never built. There are parking lots and much of the site is paved, but no buildings. The debris is the road closed sign which was already on the ground when we got there, and broken sandbags which were holding it. Fun fact: this was the only site I was ever asked to leave by the police. The site is private property but we were on the sidewalk which is public. He asked me to go anyway.
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Undisclosed #1
I think this may be one of the worst offenders, the Dahua "12MP" fisheye.
Not only is it marketed as 12MP, the spec sheet lists the resolution as 4000x3000. Effective pixels.
The other ones don't seem to actually state a bogus stream resolution as well.
I don't know how many it does use, but it's not possible to have a fisheye with a resolution as high as the sensor unless the sensor is round, or you are including dark pixels, right?
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