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Bean00

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Posts posted by Bean00

  1. Posted

    Very correct... " title="Applause" /> except...

     

    Dependent if they have the older or the newer 7.5A power supply... GE realized about this limitation quite of few years ago and start shipping 7.5A power supplies, so if this system came with it, then it will work. If not, go with a single drive up to 500G..

     

    If you want to have multiple hard drives in this system, then you should have 7.5A external power supply - The part number is PSU-7.5AMP and it is available for under $100.00

     

    So THATS whats up with the DVMRE powersupplies. I always wondered and GE Tech support never would explain why they had two skus for DVMRE powersupplies.

  4. Posted · Edited by Guest

    I'm still trying to figure out why tomcctv keeps saying that a cif image is better than a d1 image in this configuration:

     

    you will also have a bad image they need to record in cif. remember a cif image with a very high bitrate give good detail images

     

    because it says in the manual for the camera dont use D1 as artifacts (datalace) will result in bad image. cif is recommended. with good bitrate.

     

    dvr should record 2cif or 4cif ............ the camera will not work with D1 and will need to run 30fps.

     

    You get interlacing with d1, sure. That's why you de-interlace. The 18% calculation works for D1 but does it work for cif? At 320 pixels wide that means the plate is ~60 pixels wide. IS that enough detail to read a plate? I'm be aiming for 35-40% plate/screen ratio if I was forced to use CIF. But I wouldn't use CIF, I'd use D1 on a DVR that has a good de-interlace tha is tuned for motion. (aver's de-interlace #2 works great for my needs).

     

     

    It's not better. Bosch/Extreme recommends trying 2CIF if you have an issue with D1 because of possible deinterlacing issues.

     

    They absolutely do not recommend CIF. Matter of fact they state to record higher than CIF in those docs I linked to earlier in the post.

     

    And the 18% rule won't work in CIF as it would be too pixelized to read in that small of an image.

  6. Posted

    Look at where all the 700TVL cameras are coming from, mostly.

    Anyway, its the same total effective pixels as a 480TVL, and ive seen clearer 480TVL 10 years ago than some of the current 650TVL ..

    Its all marketing hype, thats the bottom line.

     

    Actually this has changed. Check out the new Pano chip, and the new Sony Effio series. Both have higher effective pixels.

     

    976 (H) x 494 (V)

     

    But yes, 99% of those so called 600-700TVL cameras are scarcely different from the older 480TVL cameras.

     

    Heck, I've seen a few 420TVL cameras that people are claiming 600+ on.

  7. Posted

    -Why would lens calculations be different for the REG-X compared to a normal camera, its still a CCD sensor, still 1/3", still a normal 16mm lens... Sure the sensor is sensitive to only IR light, but why would that change the viewing angles???

     

     

    Hi Birdman Adam. standard lens calculations are for field of view. standard lens. the REG-X and the rest have a Black lens it cant see field of view its there to look for reflections from its IR reflecting back. if you stand infront of the camera it will not see you at all but it will pick-up reflection from your watch or belt buckle.

     

    Well it has an IR pass filter, so that it blocks light that it's not emitting. It helps with LPR tag rec on reflective plates, eliminating other light sources in the image such as headlights.

     

    But a 1/3" CCD with a 1/3" 16MM lens is the same field of view regardless of whether it has a IR pass filter or not.

  9. Posted

    we seam to be talking about differant cameras here i thought the first post was for a REG-X which can not give you a number plate at 18% the REG-X is for close work only 5-7m max giving you 120% as seen on the bosh site. we dont get are cameras from bosh are cameras come from our CNB distributor.

     

    You know what? I think I'm done with discussion. Birdman Adam gets it, and thats the only reason why I posted this info. I don't need to debate whether 18% of an image at 5m is the same as 18% of an image at 20m.

     

    Scruit,

     

    I got to say. You have the sweetest mobile setup I've ever seen.

  11. Posted

    automated license plate recognition is not the same as ALPR which in true terms means AUTOMATIC LICENCE PLATE RECOGNITION also known as anpr. the cameras dont see numbers its a very powerful algorithm set to read plates from upto a mile away and at speeds of over 100mph and your looking at $15.000 each.

     

     

    information from a ANPR camera

     

    licence number

    colour and make

    owners details

    tag check

    outstanding fines

    insured or not

    persons wanted.

     

    Again, I'm not talking about the software itself. The Cameras are specified in order to provide the necessary amount of information for ALPR(or ANPR) to operate effectively.

     

    The camera isn't doing the work - but ALPR/ANPR software requires more detail than the human eye to identify plates and Bosch/Extreme spec their cameras to provide that level of detail.

     

    And again, I was only pointing out this fact to state that since he ISN'T doing ALPR, he has a little extra wiggle room on those distance numbers.

     

    18% is ok for a license plate. 20% is better. The bigger you get the more you you lose in focal width running the risk that cars will drive too far left or right and you'll miss the plate.

     

    More is always better. 18% is just the number Bosch uses. And since they tend to be conservative on LPR capture, I went with that number .

  15. Posted

    Heres another good resource from them.

     

    http://stna.resource.bosch.com/documents/REG-XClose-rang_ApplicationReference_enUS_T6006569227.pdf

     

    Yeah, I don't recommend pushing the specified distance too much, but there is wiggle room.

     

    and tomcctv, Bosch specifies the distances on their LPR cameras to provide optimum resolution for ALPR(automated license plate recognition) applications. So that "used in conjuction with ALPR software" it works flawlessly.

     

    For standard plate capture, to be reviewed by a human eye, you don't need as high of a pixel density.

  16. Posted

    Good Evening, and thanks for your reply. It is a United Security Associates Group (USAG) stand alone DVR model # US-DVR-E216480. USAG is located in Deerfield Beach, Florida.

     

    Thanks

    Great! I am familar with that unit under a different name.

     

    That model does support USB attached storage - so you should be able to do exactly what you did with the Speco unit.

     

    And Rory is right, if you don't mind voiding your warranty you could always put in a new drive.

  17. Posted

    Btw, Bosch(and Extreme before them) recommend that the DVR be set to 2CIF rather than D1 for LPR capture. However they changed the wording since it became Bosch, now stating "sometimes" 2CIF is better.

     

    http://stna.resource.bosch.com/documents/REGL1LicensePla_SolutionBrief_enUS_T6224639499.pdf

    Page 2, under DVR Settings Optimized for REG.

     

    The Bosch LPR range specs are for ALPR. Simple capture only needs about 18% of the image and can a bit further away. Human eye is still a bit better at reading numbers than a computer .

  19. Posted

    a year ago i heard that when install sony camera when come to more than 10 camera and the fps will start dropping, is that true? one of my friend previously trying to install about 32 unit sony ip and finally they only manage to get 2 fps. what i know they are using a good pc, good cat5 and switch

     

    Sony's embedded NVR is a little limited. Their software will depend on the PC.

  21. Posted

    True enough... it depends on which "flavor" of H.264 it is and how you implement it.

     

    H.264 Main profile and High Profile should give you better video quality than MPEG-4 at similar bitrates.

     

    Most reputable manufacturers are using Main Profile it seems these days. Not sure what Geovision is using as they just call it "GEO H.264"(and was in no way am I saying they are not a reputable manufacturer.)

  22. Posted

    I’ve read that the unit should be H.264AVC compression?

     

    Not really, in most cases that just means worst quality recordings, although longer recordings.

     

    To qualify this:

    MPEG-4 is a compression design to reduce the file size of video. You do lose some quality with this.

     

    H.264 is an improved version of MPEG-4 and should give you better video quality at the same bitrate compared to MPEG-4.

     

    MJPEG is a much larger file size however is superior in quality.

  23. Posted

    Well my 3500mah battery hasn't blown up yet - for that matter neither has the hub lol.

     

    For anyone who has the HTC EVO - the seidio 3500mah is a must. 4G, Wifi, GPS all enabled and I'm still in the green when I go to bed. now I actually get to use my super phone lol.

     

    Yeah sucks that the iPhone wont let you change the battery - though I hear it gets pretty good battery life overall. Of course it doesn't have a 4G radio to suck the juice out of it.

  24. Posted

    ^^^ What he said.

     

    There is a reason that the largest share of the US market is owned by manufacturers who OEM products. Most true manufacturers either don't understand our market or won't invest what they need to in order to provide the level of support and service to the integrator.

     

    It's not just about price - it's about value.

     

    Not to mention those true manufacturers who do decide to come into the US really irritate their largest customers - the Manufacturers who rebrand their products.

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