motion blur and unclear image in general

Discussion in 'Dahua' started by GKyle840, Jan 2, 2019.

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  1. GKyle840

    GKyle840 Young grasshopper

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    I have a dahua hdw5231R-ZE camera set up using BI. My images at night seem to have an awful lot of motion blur and seem unclear in general. I would appreciate any input on the matter and have attached a short clip. most of my settings are at the default other than the following.
    in the Dahua web GUI I lowered 3D NR down to 31, frame rate is at 15 and Iframe is also at 15.
     
  2. pozzello

    pozzello Getting comfortable

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    some spotting due to dirt/residue on your dome, but not too bad really.

    might try to lower DNR even further. also, you could mess with exposure, shortening it from default (to higher number) at the expense of darker image which might require higher gain...
     
  3. bigredfish

    bigredfish Known around here

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    Really not that bad. Agree with @pozzello , to improve try playing with your exposure settings, and/or maybe try adding some light (IR or white light)
     
  4. SouthernYankee

    SouthernYankee IPCT Contributor

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    Video looks ok to me... The camera is mount to high for a good identificarion.
     
  5. GKyle840

    GKyle840 Young grasshopper

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    I will try cleaning the lense. I will also mess with the dnr and exposure some.
    I am going to get another camera for ID that sits to the side of the front door and is mounted at 6 feet.
    The current camera is mounted about 8 feet off of the ground.
     
  6. flynreelow

    flynreelow Getting the hang of it

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    yea like others said, pic actually looks really good for night time. also, spots on dome that need to be cleaned
     
  7. Q™

    Q™ IPCT Contributor

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    I concur! :) Lower the camera and move it closer to the door. Adding light will help you obtain better results too. This is a good example of the Looneyism, "do you want to see what happened or do you want to see who did it?"
     
  8. Dave Lonsdale

    Dave Lonsdale Getting the hang of it

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    Hello GKyle840
    I must disagree with the guys above. Only the static parts of the image are good and are of no interest. Your courier is completely blurred (maybe it's you). I have the same problem.

    Pozzello/bigredfish have good advice but I don't want to add more light. The other thing to bear in mind is bit rate - it seems to me that although you set the frame rate to 15, you're only getting 8, perhaps because there just aren't enough bits of image data per frame. I like to use the maximum bit rate setting available, but perhaps because of noise in the image VBR doesn't help much.

    As well as picking out alerts, I record continuously on nine cameras. To get 7 days storage with a 3TB drive, I only use 5 fps but because I record continuously I don't need to use an iframe of 5 (I think...) I assume the shutter speed controls how quickly the image is captured and a low frame rate gives the best chance of getting all the bits from A to B (although really I only have a shallow understanding). It's all a compromise.

    Oh and I reckon cleaning the lens will do diddly squat.
     
  9. fenderman

    fenderman Staff Member

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    You disagree because you don't understand how IP cameras work. Motion blur is never ever caused by low frame rates. It's all about exposure.
     
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  10. Dave Lonsdale

    Dave Lonsdale Getting the hang of it

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    Hello fenderman, I am always interested to read what you have to say.
    On this occasion, the problem is I didn’t express myself clearly enough. I was trying to say that shutter speed is what matters and my low frame rate is to conserve disc space. Am I right to say that when recording continuously, there is no benefit in using an iframe that matches the frame rate?
     
  11. SouthernYankee

    SouthernYankee IPCT Contributor

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    Dave

    You are both right and wrong. The frame rate, iframe, shutter speed and amount of light effect the guality of the video. If there is little to no motion then just about any value will work. If it a car driving at 45 mph, at night it extremely important.
     
  12. aristobrat

    aristobrat IPCT Contributor

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    One thing that can help with motion blur at night is to increase the shutter speed. The tradeoff is that a faster shutter speed usually darkens the image a bit.
     
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  13. adamg

    adamg Getting the hang of it

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    I don't see any substantial motion blur. If you want more detail on a particular portion of the image, you need to zoom in on it to get more pixels on target.
     
  14. Dave Lonsdale

    Dave Lonsdale Getting the hang of it

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    Hello adamg. "I don't see any substantial motion blur" ?!?!?!? So who's this then? Are we referring to the same video?
    vid (3)_Moment.jpg
     
  15. crw030

    crw030 Getting comfortable

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    That appears to be a faceless man. Is that the best still of the lot?
     
  16. adamg

    adamg Getting the hang of it

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    You aren't going to get a highly detailed mugshot with the location and wide field of view of your camera. Can you do the same video test in daylight and compare the quality? I suspect even the daylight image will look like that.
     
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  17. GKyle840

    GKyle840 Young grasshopper

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    I plan to have a camera to the side of my door for ID however I was just wondering if this camera was capable of less blur in the night video. It would be different if it was completely dark but the neighborhood is pretty well lit and I have 2 bright porch lights by the subject. I will post a video during the day. It doesn't have too much blur during daylight.
     
  18. aristobrat

    aristobrat IPCT Contributor

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    Increase the shutter speed.
     
  19. GKyle840

    GKyle840 Young grasshopper

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    I have tried increasing the shutter speed and it doesn't seem to make a difference. both of my 2 cameras do this. it seems almost like at night nothing is in focus other than the cars.
    here is a video from tonight of my 2nd camera.
     
    Last edited: Jan 14, 2019
  20. flynreelow

    flynreelow Getting the hang of it

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    The ir is really the reflecting off the snow and shirt ..