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question about werribee/hoppers cameras

Discussion in 'Politics, Laws, Government & Insurance' at netrider.net.au started by kyro_02, Nov 25, 2009.

  1. Do they flash, record your image, calculate and fine if you are found over the limit? or do they caculate so fast that it has enough time to calculate and flash in a matter of seconds

    I haven't seen it ever flash me before, until tonight, I've lived inwerribee for 5years and I definitely know the cameras are there, and never forget about them... I was 110% sure I was doing 95kph, as I always slow to 5-10kph when passing in case of dodgy camera fines, i have never received a speeding fine, ever.

    so yeah, just wondering if they do actually flash (maybe only recently) store your image, calculate, and fine if found to be speeding?
  2. They are "flashless"

    Infra Red I believe.
  3. Cover your plate and go through again speeding to be sure...

  4. As always Vic is 100% correct.

    Fixed cameras use infra red flash units so we cant see it.
  5. Dunno, depends how new the camera is. My local (Burwood hwy ftg) is a flash type, the one outside the Burwood K-mart are flash as well; both are the old box type with separate flasher (Saw someone heading southbound at a rate of knots there only a few weeks ago; falsh flash!)
  6. The ones along the Princess are all flashless IR cameras as are the ones along the Western Sting Road.

    The cameras at intersections are flash cameras
  7. Vic likes to flash for camera's...
  8. the cameras on the werribee/hoppers they have 2 boxes on each side
  9. Are these the ones where someone has brilliantly painted massive yellow dollar signs in the middle of the lanes as a warning?

    If so... I hate those cameras, but love those dollar signs!
  10. I've always wondered, if I rigged up a heating element to my plate, would that make the plate unreadable to IR??
  11. Nah, no benefit at all. At least, not at any sane temperatures.

    The speed cameras are using flashes in the near-infrared part of the spectrum, just off of the edge of the visible light spectrum. Cheap CCTV cameras can see near-infrared (and visible light) because the makers were too cheaparse to install an infrared filter to block it out - CCD sensors can see near-infrared just as well as visible light. Plus being able to "see in the dark" using near-IR light is a great security trick.

    (The infrared light creeping into the photo makes for terrible photographs, which is why proper digital cameras have physical near-IR filters built in and so cannot see near-infrared. Many consumer camcorders have a "night vision" or "infrared" mode which allows the sensor's IR filter to be slid out of the way, after which an IR light source can "invisibly" illuminate the subject.)

    Thermographic cameras which do the cool Predator heat-vision thing use the other end of the infrared spectrum. They're super-expensive, highly specialised and not useful for taking photographs of license plates.

    IR photography is done in the part of the IR spectrum right next to "red" on the scale.
    Thermographic photography is done elsewhere in the "infrared" spectrum, at a much longer wavelength. :)
  12. Nothing could be further from the truth :D
  13. So Spots, I could use my old video camera with "night vision" to test my theory then, given that it can operate in near infrared like speed cameras do. Might get around to this one day.

  14. Easy way to check if a camera's CCD sensor can see near-IR is to point the camera at a TV remote, point the remote toward the camera and press one of the buttons at the remote.

    Alternately, if you own a Nintendo Wii, point the camera at the incorrectly-named "sensor bar" while the Wii is turned on.

    There should be a bright flickering light from the remote in the viewfinder of the camcorder, or in the video feed/recording. If it's very dim or not visible at all, a physical filter is blocking the IR out. Or your remote's batteries are flat. :p
  15. Saw an example of over policing yesterday.

    6 speed cameras in 100m on Mickleham Rd up past Craigieburn Rd.

    Three on one side and three on the other. There was a sign stating "Operator Training in Progress" but I wasn't game to speed up so that could practice taking a real photo (6 times the demerits & fines would hurt).
  16. My camera definitely does see near IR. I've seen the remote thing you mentioned.

    I wonder what the camera would see if I surrounded the plate with bright IR LED's :-k
  17. ^^ The dispersion isn't enough for a standard LED Rob, its about 22 degrees...

    However slightly diffused perspex with bright IR LED's around the edge might...?
  18. My camera sees 5 LED's on each end of the "sensor" bar. spaced out like so;

    * *** * * *** *
    In "super night shot" it floods the CCD so much that it "spills" across the sensor
  19. I thought about doing that, ooohhhh, lets see, some 5-6 years ago after my stupid idea of hooking up a zenon flash tube with a remote flash slave to set it off. Man, what was I thinking :?