Rajagra
Well-Known Member
- Joined
- Aug 15, 2015
- Messages
- 2,957
- Reaction score
- 2,355
- Country
- United Kingdom
- Dash Cam
- Mini0806
I've been reading some of the threads about having to refocus the lens on some dashcams. It made me wonder if mine needed doing. Checking my videos it's a bit disappointing that plates more than what seems like 2 or 3 car lengths away can't be read. If refocusing needs doing, I'll do it. But I don't want to rip it open unless it's necessary.
Is there a table of how far away various dashcams should be able to read number plates? I know there are many variables in play, but surely they can be dealt with.
I did some tests on my Mini0806 with custom bitrate firmware, at 2560x1080 30fps superfine.
Summary of results looking at my UK white front numberplate at key distances, hand holding the dashcam.
Late afternoon, cloudy but fairly bright, even light:
11m: Very readable. (White part of number plate takes up 62x15 pixels.)
14m: Quite readable, but starting to need to guess some characters. (49x11 px)
17m: Unreadable. (40x10 px)
So a little better than I thought it was, but maybe possible to get more out of it?
How does this compare to other 0806s/other dashcams?
NB UK law requires drivers to be able to read number plates at 20m, so my camera fails that test!
Is there a table of how far away various dashcams should be able to read number plates? I know there are many variables in play, but surely they can be dealt with.
I did some tests on my Mini0806 with custom bitrate firmware, at 2560x1080 30fps superfine.
Summary of results looking at my UK white front numberplate at key distances, hand holding the dashcam.
Late afternoon, cloudy but fairly bright, even light:
11m: Very readable. (White part of number plate takes up 62x15 pixels.)
14m: Quite readable, but starting to need to guess some characters. (49x11 px)
17m: Unreadable. (40x10 px)
So a little better than I thought it was, but maybe possible to get more out of it?
How does this compare to other 0806s/other dashcams?
NB UK law requires drivers to be able to read number plates at 20m, so my camera fails that test!
UK number plate specs:
Characters must be 79mm tall
Characters (except the number 1 or letter I) must be 50mm wide
The character stroke (the thickness of the black print) must be 14mm
The space between characters must be 11mm
The space between the age identifier and the random letters must be 33mm
The margins at the top, bottom and side of the plate must be 11mm
Vertical space between the age identifier and the random numbers must be 19mm
Characters must be 79mm tall
Characters (except the number 1 or letter I) must be 50mm wide
The character stroke (the thickness of the black print) must be 14mm
The space between characters must be 11mm
The space between the age identifier and the random letters must be 33mm
The margins at the top, bottom and side of the plate must be 11mm
Vertical space between the age identifier and the random numbers must be 19mm
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