Dashmellow
Well-Known Member
- Joined
- Sep 22, 2013
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HDR shouldn't be used at night, there should be a HDR timer so you can turn it off. HDR is most beneficial during the day time
Not so!
In fact, it is literally the opposite of what you are saying, Agie.
HDR should be OFF during the day and ON at night, especially in countries with European sized license plates.
HDR during the day, especially the A119 V3 HDR causes a ghost-like double exposure due to way HDR functions. The camera takes two exposures at 30 fps each - one for the highlights and one for the shadows and superimposes them together as one properly exposed image, however because of the way HDR is implemented in this camera, the two images are out of register, thus causing the apparent double exposure.
(Note that the problem appears on the fast moving truck but not on the hood of my vehicle because the camera sees it as not moving.)
At night, the same HDR phenomenon, two differently exposed images superimposed over one another but also slightly out of register, allows for the capture of license plates at high speed, especially if the plates have good reflectivity and you have decent headlights.
Here is a good night time HDR example I've borrowed from @Karagandinez using the 2.6T firmware to illustrate.
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