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Stanleyryan

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Posts posted by Stanleyryan

  1. Posted

    The IR cut have two types, one have only one filter, one other have two filters.

    Check your camera if it have two filters, if have two filters, do not support mixture light(IR and white light).

     

    Two filters function:

     

    During day time, one filter filtered the IR lights to assure good image quality and reproduction.

    During night time, one another filter filtered the white light to assure good b/w image.

     

    One filter camera only have day time filter.

  3. Posted

    Attached are 2 photo snapshots from my DVR. One pic is when I set the DVR settings to D1 and then the other is when I set the DVR to 960h.

    Under 16:9 ratio, you set D1 resolution, under 4:3 ratio, you set 960H resolution " title="Applause" />

     

     

    I don't understand what you mean by this.

     

    D1 resolution is 704 x 480, 4:3 ratio. if you display it in 16:9, the image of course will be stretched, 960H resolution is a kind of D1 resolution under 16:9 ratio, it's resolution is 960 x 480. But it have to display 16:9 ratio through 960H DVR.

  13. Posted

    I recommend you to use Hikvision or Dahua POE cameras, most of them under your budgets, you can select some bullet and turret type for installing.

     

    But besides cameras, you require a NVR or PC for storage, I recommend you to buy a NVR too for 7/24 recording.

  14. Posted

    Hi Fonix,

     

    Black clothes are showing purple color normally happened in CMOS sensor cameras. A CMOS sensor require a IR cut filter to correct the color. Cheap cameras always without or with low quality IR cut.

     

    And some cheap sensor, like cmos camera 420tvl use pixelpus pc1030 image sensor will meet the color probs even with a IR cut. I recommend you to use high resolution cmos cameras like 800tvl, 900tvl or 1000tvl, price is similar, also cheap enough, but image quality is wonderful.

  15. Posted

    Hello Fonix,

     

    Yes some of cheap cameras also with reputation and good quality, even with the same specs and chipset compare to brand cameras like Dahua.

     

    Brand cameras are expensive at the same specs as following reasons:

     

    1. Brand cameras is able to provide local after sale service, so they are trustful.

    2. Brand cameras often with their own patent design, cheap cameras often use common case where it can sourcing from market anywhere.

    3. Brand cameras are well known, if you meet some probs, it's more convenience to ask for help. Maybe some people meet the same probs.

    4. Brand cameras firmware upgrades is trustful, often can be download on their website.

     

    As said before, I recommend you to select HD systems (Analog HD or IP HD), here is the differences of these two HD solution:

     

    Analog HD: (AHD, HDCVI, HDTVI, HD-SDI), all of Analog HD are real time with no time lag.

     

    AHD: max. 1.3 MP resolution at present, use Nextchip solutions, many manufacturers do it, quite cheap, signal transmit 500Meters over coaxial cable.

    HDCVI: Designed by Dahua, max. 2.0MP resolution, mature technology, is able to transmit video, audio and RS485 signals in one coaxial cable, 500 Meters. cheap price.

    HDTVI: Designed by Hikvision, max 2.0MP resolution, but can't transmit audio, RS485 signals in one coaxial cable, 300 Meters, cheap price.

    HD-SDI: max. 2.0 MP resolution, the image quality is more sharp than AHD, HDCVI and HDTVI, but the signals limited to 100 Meters to 200 Meters by better coaxial cable. Price double than above.

     

    Pros: easy for installation, no time lag, cheap price.

    Cons: Resolution limited to 2.0 MP

     

    IP HD solution:

     

    Most of the IP cameras are real time preview from your pc or cellphone, but a little time lag.

    IP cameras is able to provide higher resolution like 2.0 MP, 3.0MP even more, and together with good software for multifunction settings, including video analytics, it's more intelligent.

     

    Pros: Higher resolution, full functional software.

    Cons: a little time lag, require some network knowledge for managing the system. Price are expensive than Analog HD system.

  17. Posted

    What you asked is analog camera. A CCTV Camera chipset have two core parts: Sensor + DSP

     

    Different Sensor and different DSP make the price vary.

     

    Sensor is to capture images, DSP is to process and convert the image into signal, like a CPU in a PC.

     

    Just like 420tvl, cheap camera with bad image quality, but high end with good image quality.

     

    1/3" or 1/4" is the size of sensor, the larger size the better images it captures.

    How much of a difference would there be between a high end (lets say) 420TVL vs a cheap 420TVL camera.

    High end ccd 420 TVL normally use Sony 3142 + 633 chipset (1/3"), and cheap use fake or Sony 3142 + 405 (1/4"), price only us$1-2 different with the same camera housing. 420 TVL CMOS please forget it, it almost the same price.

    And just incase a high end brand dont manufacture 420TVL cams. Simply change the comparison example to 540TVL cams. you can easily find $30 cams and $250 cams with he same 1/3 ccd/cmos and TVL specs and huge price differences.

    540 TVL is a big difference solution, there are too many chipset to select from Sony, Panasonic, Sharp, Nextchip, Sony is expensive and Nextchip is cheap, it could combine with different Sensor and different DSP, like Sony Sensor + Nextchip DSP. Of course the image quality different too especially in night vision.

     

    What is DSP and how much of an affect does it have. Are the lenses that big of a cost difference? and if so, is it that obvious when comparing D1 video recordings?

    As said above, DSP is the core part in a camera, it just like the CPU in a computer, different DSP cost big differences, lenses also is a big fator in camera, better lenses more clear images, but cost not too much. It is big difference in D1 resolution recordings.

    Some things from a quick search bring up terms that vary greatly in pricing:

    Ex-view, DIS, hdis, super had, interline, effio, pixplus....

    Ex-view, Super HAD, Effio is a kind of CCD sensor from Sony

    DIS, HDIS is a kind of CMOS sensor

    Pixplus is a CMOS sensor manufacturer

    Interline is a kind of CCD sensor technology

     

    Normally CCD sensor is more expensive than CMOS sensor, with little noise and better night vision, and especially stable enough. But CMOS sensor is able to get higher resolution with very good price.

     

    Finally I suggest you forgeting the Analog Cameras, High Definition (HD) is the trend: Analog HD (AHD, HDCVI, HDTVI) cameras, Mega Pixel IP Cameras.

    Analog HD cameras price is better, even better than analog cameras, IP Camera price is expensive but higher image quality.

  24. Posted

    Bad luck, Cantonk is not a big company, you should investigate the company before order. Cantonk only simplely assemble all components, could not fix probs if occured.

     

    I suggest you to replace the board from the supplier,otherwise you will loss more. Next time before ordering, you'd better to visit their factory first for long cooperation, otherwise purchase from local importer is better.

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