DAHUA HD CVI PTZ

 

What is HDCVI Camera?

What is HDCVI Camera

 

 

What's the HDCVI camera? To answer this question, you need to know what the HDCVI, the HDCVI is the abbreviation of High Definition Composite Video Interface (HDCVI), which is one of recent technologies for offering high definition solution to analog surveillance system (CCTV). HDCVI is a video transmission technology in high definition via coaxial cable, allowing reliable long-distance HD transmission at lower cost, while complex deployment is applicable. HDCVI modulates video signal to level and then transmit by adopting base-band and quadrature amplitude modulation; which is also the reason of its naming. This technology avoids the cross talk of CVBS and completely separates the brightness signal and hue signal, hence further enhances video quality. HDCVI offers two specifications — 1920H (1920×1080) and 1280H (1280×720); which are compatible with the industrial standard 1080p(1920×1080) and 720p(1920×1080).

 

 HDCVI Camera

What's the difference between HDCVI and traditional analog camera? As we know, traditional analog camera utilizes CCD image sensor to capture images, which comes with interlaced scan, its highest resolution is 960H (960x480, or 960x576). In order to compete with IP camera, some manufacturers developed analog camera which is based on progressive scan CMOS image sensor, hence to deliver megapixel resolution images (720p & 1080p).

Interlaced scan vs progressive scan

What differentiates a progressive scan from an interlaced scan is that the progressive scans system draws every line on the screen in just one pass, rather than in two passes.

  • Disadvantages of interlaced scan: Image artifacts, Intentional image blurring, Improper reproduction of finer details, Image flickering (This flickering is also called “interline twitter” and is caused by the image on the screen containing vertical detail that approaches the horizontal resolution of the video format.)
  • The advantages of progressive scan: No image artifacts, No blurring, Higher vertical resolution, Higher quality images (Images are smoother are more detailed in progressive scan as they are refreshed at a faster frequency.)

Back to 2014, HDCVI, HDTVI, HDAHD (or AHD) technologies were released by different manufacturers. End-users are happy to embrace these new technologies, because they give them the chance to upgrade existing standard surveillance system to HD analog system. Unfortunately, some users like me feel overwhelmed, because they are too similar on both features and price. Which one is the best? In my humble opinion, there is no best one, each technology has its unique advantage, but all of resolution (image performance) keep same without significant difference.

 

HDCVI advantage

 

Let's continue introducing the HDCVI technology, HDCVI features a patent named auto signal compensation (ASC), which only allows an extremely low signal distortion along long-distance transmission. HDCVI solution incorporates both cameras and DVRs, and the system is star topology structured; DVR is served as a node to have an over coax P2P (Point-to-Point) transmission to camera. Cable selection is based on transmission distance: cable 75-3 and 75-5 are recommended for transmission within 500 meters, cable 75-5 and above for over 500 meters. Connector or jointing technology could be applied for connecting and the installation is exactly the same as that of conventional analog devices, which posts no special requirements either for indoor or outdoor scenarios with better anti-interference capability offered.

HDCVI Camera

To further realize multiple-signal transmission over one cable, both audio signal and dual-way data communication signal are embedded in a blanking zone; which enhances the synchronization with video signal; and max supports 44.1kHz sampling rate thanks to ASC. The forward and reverse data channels composite in the frame blanking zone, realizing a two-way end-to-end transmission to support control commands such as camera focus, PTZ control, real-time alarm and etc. The forward outputting data supports high transmission baud rate as the sending time and electric signal baud rate are predictable, meanwhile,  the receiving end is of high ASC performance;

DAHUA HDCVI

on the other hand, the reverse outputting data supports lower baud rate due to its low signal frequency and limited data, which is elected by the impedance matching. However, with ASC adopted, the reverse channel could restore electric signal during long-distance transmission at some degree.Therefore, HDCVI is an optimal solution for megapixel high definition application, featuring non-latent long-distance transmission at lower cost.


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  1. DAHUA SD63220I-HC

    SD63220I-HC - DAHUA SD63220I-HC 2Mp 20x Full HD HDCVI PTZ Dome Camera SD63220I-HC

    $258.00

    >20x optical zoom
    >Max. 25fps@1080P & 50fps@720P resolution
    >DWDR, Day/Night, Ultra DNR, Auto iris, Auto focus
    >Control over coaxial cable, long distance real-time transmission
    >HD and SD switchable
    >Max 300°/s pan speed, 360° endless pan rotation
    >Up to 255 presets, 5 auto scan, 8 tour, 5 pattern
    >Built-in 2/1 alarm in/out
    >Support intelligent 3D positioning with DH-SD protocol
    >IP66, OSD
     
    The delivery time is about 27 working days.
    Learn More
  2. DAHUA SD6C230I-HC

    SD6C230I-HC - DAHUA SD6C230I-HC 2Mp 30x Full HD HDCVI IR PTZ Dome Camera SD6C230I-HC

    $495.00

    >20x/30x optical zoom
    >Max. 25/30fps@1080P(1920 x1080) & 50/60fps@720P resolution
    >DWDR, Day/Night(ICR), Ultra DNR, Auto iris, Auto focus
    >Control over coaxial cable, long distance real-time transmission
    >HD and SD switchable
    >Max 240°/s pan speed, 360° endless pan rotation
    >Up to 255 presets, 5 auto scan, 8 tour, 5 pattern
    >Built-in 2/1 alarm in/out
    >Support intelligent 3D positioning with DH-SD protocol
    >IR Distance up to 100m
    >IP66, OSD
     
    The delivery time is about 27 working days.
    Learn More
  3. SD6A220I-HC

    SD6A220I-HC - DAHUA SD6A220I-HC 2Mp 1080P 20x HDCVI IR PTZ Dome Camera SD6A220I-HC

    $638.00

    >20x/30x optical zoom
    >Max 25/30fps@1080P, 50/60fps@720P resolution
    >DWDR, Day/Night(ICR), Ultra DNR, Auto iris, Auto focus
    >Control over coaxial cable, long distance real-time transmission
    >Max 240°/s pan speed, 360° endless pan rotation
    >Up to 300 presets, 5 auto scan, 8 tour, 5 pattern
    >Built-in 2/1 alarm in/out
    >Support intelligent 3D positioning with DH-SD protocol
    >IR Distance up to 150m
    >IP66, OSD
     
    The delivery time is about 27 working days.
    Learn More
  4. DAHUA SD6A230I-HC

    SD6A230I-HC - DAHUA SD6A230I-HC 2Mp 1080P 30x HDCVI IR PTZ Dome Camera SD6A230I-HC

    $798.00

    >20x/30x optical zoom
    >Max 25/30fps@1080P, 50/60fps@720P resolution
    >DWDR, Day/Night(ICR), Ultra DNR, Auto iris, Auto focus
    >Control over coaxial cable, long distance real-time transmission
    >Max 240°/s pan speed, 360° endless pan rotation
    >Up to 300 presets, 5 auto scan, 8 tour, 5 pattern
    >Built-in 2/1 alarm in/out
    >Support intelligent 3D positioning with DH-SD protocol
    >IR Distance up to 150m
    >IP66, OSD
     
    The delivery time is about 27 working days.
    Learn More
  5. SD6AE230IA-HC PHOTO

    SD6AE230IA-HC - DAHUA SD6AE230IA-HC 2MP 30x Starlight IR PTZ HDCVI Camera DH-SD6AE230IA-HC without logo

    $763.00

    2MP 30x Starlight IR PTZ HDCVI Camera

    > 1/1.9” 2Megapixel Exmor CMOS
    > Powerful 30x optical zoom
    > Starlight technology
    > Max. 25/30fps@1080P, 25/30/50/60fps@720P
    > 120dB true WDR, 3D DNR
    > IR distance up to 200m
    > IP67 , IK10
    > without Logo,English firmware
    >100% original products manufactured by DAHUA

     

     
    The delivery time is 25 working days usually, some times can complete early, only 10-15days.

    Learn More
  6. SD59225I-HC

    SD59225I-HC - DAHUA SD59225I-HC 2MP 25x Starlight IR PTZ HDCVI Camera DH-SD59225I-HC without logo

    $300.00

    2MP 25x Starlight IR PTZ HDCVI Camera

    > 1/2.8” 2Megapixel Exmor R CMOS
    > Powerful 25x optical zoom
    > Starlight technology
    > 120dB true WDR, 3D DNR
    > Max. 25/30fps@1080P, 25/30/50/60fps@720P
    > IR distance up to 150m
    > IP66
    > without Logo,English firmware
    > 100% original products manufactured by DAHUA

     


    The delivery time is 25 working days usually, some times can complete early, only 10-15days.
    Learn More
  7. DAHUA SD50225I-HC

    SD50225I-HC - DAHUA SD50225I-HC 2MP 25x Starlight PTZ HDCVI Camera DH-SD50225I-HC without logo

    $278.00

     

    2MP 25x Starlight PTZ HDCVI Camera

    > 1/2.8” 2Megapixel Exmor R CMOS
    > Powerful 25x optical zoom
    > Starlight technology
    > 120dB true WDR, 3D DNR
    > Max. 25/30fps@1080P, 25/30/50/60fps@720P
    > IP67, IK10
    > without Logo,English firmware
    >100% original products manufactured by DAHUA

     

    The delivery time is 25 working days usually, some times can complete early, only 10-15days.

    Learn More
  8. SD52C225I-HC

    SD52C225I-HC - DAHUA SD52C225I-HC 2MP 25x Starlight PTZ HDCVI Camera DH-SD52C225I-HC without logo

    $265.00

    2MP 25x Starlight PTZ HDCVI Camera

    > 1/2.8” 2Megapixel Exmor R CMOS
    > Powerful 25x optical zoom
    > Starlight technology
    > 120dB true WDR, 3D DNR
    > Max. 25/30fps@1080P, 25/30/50/60fps@720P
    > IK10
    > without Logo,English firmware
    >100% original products manufactured by DAHUA

     
    The delivery time is 25 working days usually, some times can complete early, only 10-15days.
    Learn More
  9. SD60225I-HC

    SD60225I-HC - DAHUA SD60225I-HC 2MP 25x Starlight PTZ HDCVI Camera DH-SD60225I-HC without logo

    $305.00

    2MP 25x Starlight PTZ HDCVI Camera


    > 1/2.8” 2Megapixel Exmor R CMOS
    > Powerful 25x optical zoom
    > Starlight technology
    > 120dB true WDR, 3D DNR
    > Max. 25/30fps@1080P, 25/30/50/60fps@720P
    > IP67, IK10
    > without Logo,English firmware
    >100% original products manufactured by DAHUA

     

     The delivery time is 25 working days usually, some times can complete early, only 10-15days.
    Learn More
  10. SD60230I-HC

    SD60230I-HC - DAHUA SD60230I-HC 2MP 30x Starlight PTZ HDCVI Camera DH-SD60230I-HC without logo

    $445.00

    2MP 30x Starlight PTZ HDCVI Camera


    > 1/2.8” 2Megapixel Exmor R CMOS
    > Powerful 30x optical zoom
    > Starlight technology
    > 120dB true WDR, 3D DNR
    > Max. 25/30fps@1080P, 25/30/50/60fps@720P
    > IP67, IK10
    > without Logo,English firmware
    >100% original products manufactured by DAHUA

     

     The delivery time is 25 working days usually, some times can complete early, only 10-15days.
    Learn More

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