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shropna

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Posts posted by shropna

  1. Posted

    Now, due to lack of knowledge we got Bosch to build us a IP system in one of our factory using the BVMS solution. In their engineering they planned a Core switch. Now I think this is personally a tad overdone, but it's planned to have 200 camera's in the end on the entire system within that one factory. But it did gave me something to think about. Hence me starting this topic

    You should thing about spanning tree topology ( http://en.wikipedia.org/wiki/Spanning_Tree_Protocol ) in this network.

    Also, switches should support IGMP snooping for multicast. And, when you use BVMS, try to avoid routing, port forwarding....

    Bosh use lots of random ports

     

    Here BVMS topology with iSCSI recording:

    VRM.thumb.jpg.a40fe9ca59102cddbff82e954c1e71a2.jpg

  3. Posted

    If it's just for up to a few IP cameras, get a decent mini-ITX PC (Core2 Duo, or so), and use Milestone "Go"- it's free, and does not require going to the company's website to change cameras on the license like their retail versions.

     

    The "Go" version allows for up to eight cameras, and five days of recording, should be enough for demo purposes.

    Milestone is nice soft, but cameras license via MAC address....

    If you want change camera, you will pay....

  5. Posted

    I've been getting good results with FA lenses from Fujinon and Kowa, both are pretty expensive, though.

     

    Another issue that I have been experiencing is sensor misalignment to the focal plane, one side of image always slightly out of focus, see sample here with significant focal shift. (Arecont 5105DN camera, Kowa LMVZ3510-IR Lens)

    Yes, left side of image..

    Imager placing fault, lens is good.

    Arecont cameras quality is still bad....

  8. Posted

    Soundy, this correct, if you have wide spectrum (tungsten) lights outside.

    But, when lights outside is Natrium (Sodium) or Mercury based (lots of them), this light source doesnt have IR spectrum

    Yes, Sarix also has IR "refocusing" feature.

    About lenses. This is extremely difficult to build IR corrected MEGAPIXEL lens on small imager (1/3', 1/2') image format, due small imager pixel pitch.

    Ask about this issue Baylab, he is lens guru.

  9. Posted

    other nice-to-have item is PoE support to power the cameras.

     

    +1

     

    Also, I would not pay a high premium to get bleeding edge switch technology unless there is an immediate payoff. If gigabit cameras become common in several years, it will be relatively easy to add a gigabit switch, when prices will be lower.

     

    Best,

    Christopher

    Guys, stop thing only about speed and PoE.... Yep, GigE protocol cameras (this is not network speed) You "hear" about that....

    You can thing about this, if you have lots of cameras and one control room. If you system will have lots of NVR's, control rooms also, sw choosing will be more complex...

    First! Read, study and understood network diagram, and protocols. Second, choose sw.

     

    But, if You have 16 cameras and one workstation - forget this....

  10. Posted

    Expand your search to "megapixel" or "MP" lenses, as well as "HD"

     

    I am having a hard time finding a megapixel lens that is ir-corrected and has a max focal length of 30-50mm.

     

    The application is capturing license plates coming into a facility day and night. The camera is day/night with removable IR-Cut filter. I need the greater focal length to get a tight enough shot from the building the camera is mounted.

     

    If I had to make a choice between megapixel and ir-corrected what should it be?

    IR corrected lens, only if You use IR light. If camera just removes IR cut filter at dark scenes, not necessary to have IR corrected lenses. Also, megapixel lens should be "corrected" also from chromatic aberrations, so, less sensitive to light wavelength changes...

    And, some cameras, like Sanyo HD series, has built in automatic refocusing function, when IR cut filter is removed, for best adaptation to IR wavelength.

  12. Posted · Edited by Guest

    Seriously guys, why are there so many great CCTV people coming from Russia??? What the hell...

    Big country With interesting history. Long time people was "DIY'ers" on all kind of products, and no Google and forums

    Also, i'm not from Russia, just know russian language. But, from one of countries,which was part of USSR...

  16. Posted

    Also, some liks:

    http://www.arvoo.com/workspace/static/uploads/axioma-duo301p-anpr-flyer.pdf

    http://www.microbus.com/Homepage.aspx

    http://www.planet4networks.com/acatalog/ANPR_LPR_Cameras_for_Highway_Monitoring_Paring_Lot_and_Mobile_Vehicles_.html

    http://sensordynamics.com.au/MobileANPRSolutions/tabid/56/Default.aspx

    http://ndi-rs.com/ukrs/v220

    http://www.citysync.co.uk/go.php/en/products__services/anpr_cameras/jellybean_police_mobile_anpr.html

    http://www.visioncatcher.co.za/pdf%20folder%5Cvenom.pdf

     

    I'm just ask, maybe, somebody has some experience with this kind of systems...

  17. Posted

    first thing, ask for a detailed specification from your customer (they may have some unreasonable expectations), if they don't have, and don't know what they really need, draw a spec for them.

     

    An In car ANPR system could be monster which can cover 4-5 lanes and cost more than 70K euro (really fancy one may use a 16M full frame 35mm CCD sensor and works with a powerful tailored flash) or a cheapie which cost less than 1K and works just a little bit better than a dummy camera.

     

    Software, you might need to find some 3rd party ANPR software, most them should come with a database and support some data management function, for example, print/issue ticket...

     

    One important issue is the image/video interface of the software, some of them only support 768x576 (actually only 768x288 pixel is used ), some of them may support larger format, that means you can choose some high definition camera.

     

    Illumination is another challenge, I don't think there is any built-in illuminatior has a range more than 15 m . you might need a separate illumintor .

     

    For the camera, as a gold standard, to get a decent recognition rate, the width of number plate should be more than 120 pixel, that means the picture of 768x288pix can only cover the head area of vehicle, it would be very difficult if not possible to capture the face of driver ( in some country, the driver face is a must for a bookable ticket).

     

    Triggering device, most of 3rd party ANPR software should come with video triggering function, however it won't be as reliable as radar or laser and wont' provide reliable speed information. and laser/radar =more cost.

     

    Visible light or IR, Colour or B/W are two important issues as well. Colour picture with the illumination of visible light is attractive, however, it may cause some road safety problem and may be banned by authority. Colour at daytime and B/W at night with IR seems a good compromise, but you will have to choose a camera with switchable filter and a REAL IR corrected lens.

     

    Mounting adaptor( for camea illuminator and in-car computer), such metal parts may cost every more than the camera ( an analogue camera), since you might have to order the customized one from your local supplier.

    Hm, Baylab.

    Yes, customer waiting specification, of course. Just some requirements.

    In car ANPR not should be "monster" for 4-5 lines. Leave this work for stationary mounted cameras....

    Also, 16 MP CCD can capture max 3-5 FPS now, so, will not work, or work worse in real situation. Also, i'm should "cut" lots of vertical unnecessary pixels in this case, so, four Full HD 16:9 cameras can do more, than one 16 MP Also, customer needs one line - just front and back of police car.

    Also, for ANPR, illuminator should be synced with camera capturing, if you want capture only number plates, not all picture. Actually, ANPR cameras use 25 Hz pulsed LED, synced with camera fields... For "scene and driver face" picture better way is color camera, with constant illumination, or, "native" scene illumination, but this is not required.. Actually, customer wants automatic find cars with no insurance, no TUV, etc.... ANPR engine will be always synced with database of cars....

    About mounting adapters - not problem in our country, I'm also able manufacture them (I build Lotus 7 replica myself )

  23. Posted

    Agreed... my problem was decoding h.264. Needs big bad pc, if client/server on one machine..... depending on ch and other variables obviously...

     

    We settled on 2mp, 5fps, mjpeg I believe... gave us what we needed. Compromised, but customer was happy. all that matters...

     

    Server only setup I would imagine to be different story?

    Try soft, with two different streams for Live and Recording, like this:

    www.digifort.com

  24. Posted

    Can you tell me further about latest firmware, I've looked through revision notes but didn't find anything about this

    There is not limit for fps in 4megapixel JPEG mode or they have added higher resolutions at H264?

    It is important to us to know because we need some 3mpx/5fps 0,1 lux reasonably priced outdoor cameras and Sanyo could be fine...

     

    In the middle of the week we'll receive some HD4600 but have to give all of them away to the customer so won't be able to test

    Actually, i'm not find that release note, but Sanyo ads "no limit" to JPEG mode.

    Higher resolution on H264 not available....

    I can test HD4600 at monday, regarding 3mpx/5fps... But, in real situation, i prefer and use 1920x1080 at 5fps H264 for recordings....

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