Assistance with Dahua Shutter Speed.

[trauts14]

My "Night Profile" for exposure is set to, Outdoor/Manual/ (1/120). The car in the attached pic is moving approx 30mph is a guess. There is still some blurring as you can see. What shutter speed would you all recommend to begin tweaking it? I am using a large IR illuminator as well.

While using an illuminator with a fast shutter speed, what do i stand to lose if anything? Pic quality? Thank you for any assistance.

 

[bp2008]

I'm not sure what you expect to gain by increasing shutter speed. Maybe the car will be a little sharper but everything will get a lot darker, and I don't think that cam could read the license plate if the car was parked.

 

[trauts14]

Im not concerned about license plate. I was mainly trying to get the vid as non blurry as possible.

I'm not sure what you expect to gain by increasing shutter speed. Maybe the car will be a little sharper but everything will get a lot darker, and I don't think that cam could read the license plate if the car was parked.

 

[wxman]

Unfortunately, there's no magic answer as a lot will depend on the exact amount of resultant light, distance from camera to vehicle, speed of vehicle, angle of motion relative to the camera, lens size and even the particular camera itself....You just have to do a trial and error test. Keep bumping up the shutter speed until your image starts to darken or become too noisy. As a general rule, the faster the shutter speed, the better...but there's going to be a limit to where darkness and/or noise become so extreme that you won't be able to identify anything. You should be able to get a pretty good idea of darkness and noise levels just by looking at the road as you increase the shutter speed. If the road starts getting too dark or noisy, then a car coming by will be too dark and noisy as well.

 

[trauts14]

@wxman thank you. one thing i have noticed is the glare on car windows due to angle of the sun. what would be the best way to tweak settings to remove some of the glare, if possible? my camera "Grade" is set to default.

Unfortunately, there's no magic answer as a lot will depend on the exact amount of resultant light, distance from camera to vehicle, speed of vehicle, angle of motion relative to the camera, lens size and even the particular camera itself....You just have to do a trial and error test. Keep bumping up the shutter speed until your image starts to darken or become too noisy. As a general rule, the faster the shutter speed, the better...but there's going to be a limit to where darkness and/or noise become so extreme that you won't be able to identify anything. You should be able to get a pretty good idea of darkness and noise levels just by looking at the road as you increase the shutter speed. If the road starts getting too dark or noisy, then a car coming by will be too dark and noisy as well.

 

[wxman]

@wxman thank you. one thing i have noticed is the glare on car windows due to angle of the sun. what would be the best way to tweak settings to remove some of the glare, if possible? my camera "Grade" is set to default.

The only thing you'll probably be able to do with that is just lower the "exposure compensation". The default is typically 50, but you can increase or decrease that value to make the auto exposure aim for a brighter or darker image, respectively. Lowering this value will darken the image to where the bright glare will not be quite as extreme.

You can also try WDR which may allow for more exposure compensation without things becoming too dark...HLC is another option you can try, although it may be of little help to sudden flashes of glare from passing cars.