Ambarella A2, A5, A7 and A9 Processors

some lenses do have a filter on them already which can help, I haven't used the TI solution to know if the problems they have are inherent in the chipset architecture or not


post processing can alter the video as well

here's this screenshot which I know you've seen before http://www.jokiin.com/images/screenshot.jpg

and a screenshot from the same movie file with a filter applied (in this case I used GoPro's software which works with our camera and used the protune filter)

http://jokiin.com/images/screenshot_protune.jpg

if you look at the two images side by side you can see a lot of difference in the colour depth

I run the camera with night mode on all the time which does lighten the daytime images, it's a trade off for better night results I guess, I am looking into the possibility of having the nightmode feature triggered by preset times so that daytime stuff can be richer in colour, but Chinese New Year at the moment and our engineers are off so no progress on that at this time
 
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I am talking about a new filter only on the upper side of the lens (image). So the sky will look as "Top Gear" style, darker, like before the storm in the same way like the previous volvo youtube link.
I am speaking only in theory because I don't now if for a 10mm lens external diameter is possible to create such filter which must be gradually.
Please look at the first picture from here:
http://www.cambridgeincolour.com/tutori ... ilters.htm
even in that example is about polarized lens, I just want to show you the darker sky when "No Polarizer or Polarizer at Max". And the right bottom with more light.

enjoy,
Mtz
 
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You do raise a good point - a graduated grey filter would resolve some sky exposure issues that are prevalent in many existing dash cams. However, it could also be solved in software. What needs to happen is that rather than a frame average exposure taken, an exposure weighted to the lower half of the frame should be taken instead. This would mean that the camera would be less likely to under expose. This requires dash cam manufacturers to implement this, though!

As it happens I think my dash cam might take a centre-weighted or perhaps even more like a spot exposure from the middle of the frame because if I tilt my camera down very slightly so that the horizon with the sky ends up more than half way up the frame, the exposure will change to the road instead.

Frame average, centre-weighted average, bottom-weighted average and spot exposures:

[img=float-left]https://dashcamtalk.com/forum/data/MetaMirrorCache/rguk.eu_s_dcframeavg.jpg[/img] [img=float-left]https://dashcamtalk.com/forum/data/MetaMirrorCache/rguk.eu_s_dccentavg.jpg[/img] [img=float-left]https://dashcamtalk.com/forum/data/MetaMirrorCache/rguk.eu_s_dcbotavg.jpg[/img] [img=float-left]https://dashcamtalk.com/forum/data/MetaMirrorCache/rguk.eu_s_dcspot.jpg[/img]
 
rjgscotland said:
As it happens I think my dash cam might take a centre-weighted or perhaps even more like a spot exposure from the middle of the frame because if I tilt my camera down very slightly so that the horizon with the sky ends up more than half way up the frame, the exposure will change to the road instead.

Frame average, centre-weighted average, bottom-weighted average and spot exposures:
Click to expand...

maybe that's more obvious in the full size images, can't notice a lot of difference in the small pics here, can you explain further what you mean?
 
The pictures are nothing more than an illustration to show what I meant about spot/weighted averages for those not familiar with the terms.
 
Yes, you marked just the area not showed also the differences to see what are the benefits.

enjoy,
Mtz
 
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