HD CVI Camera

 

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 HAC-HFW2220B

    HAC-HFW2220B - DAHUA HAC-HFW2220B 2.4Megapixel 1080P Water-proof HDCVI IR-Bullet Camera without logo

    $58.00

    >1/2.8" 2.4Megapixel CMOS
    >25/30fps@1080P, 25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD switchable
    >OSD Menu, control over coaxial cable
    >DWDR, Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >3.6mm fixed lens (6mm, 8mm optional)
    >Max. IR LEDs length 50m, Smart IR
    >IP67, DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

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  2. DAHUA HAC-HFW2120B

    HAC-HFW2120B - DAHUA HAC-HFW2120B 1.3Megapixel 720P Water-proof HDCVI IR-Bullet Camera without logo

    $52.00

    >1/3" 1.3Megapixel CMOS
    >25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD switchable
    >OSD Menu, control over coaxial cable
    >DWDR, Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >3.6mm fixed lens (2.8 mm, 6mm, 8mm optional)
    >Max. IR LEDs length 50m, Smart IR
    >IP67, DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

    Learn More
  3. DAHUA HAC-HFW2220E

    HAC-HFW2220E - DAHUA HAC-HFW2220E 2.4Megapixel 1080P Water-proof HDCVI IR-Bullet Camera without logo

    $59.00

    >1/2.8" 2.4Megapixel CMOS
    >25/30fps@1080P, 25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD switchable
    >OSD Menu, control over coaxial cable
    >DWDR, Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >3.6mm fixed lens (6mm, 8mm optional)
    >Max. IR LEDs length 40m, Smart IR
    >IP67, DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

    Learn More
  4. HAC-HFW2120E - DAHUA HAC-HFW2120E 1.3Megapixel 720P Water-proof HDCVI IR-Bullet Camera without logo

    HAC-HFW2120E - DAHUA HAC-HFW2120E 1.3Megapixel 720P Water-proof HDCVI IR-Bullet Camera without logo

    $52.00

    >1/3" 1.3Megapixel CMOS
    >25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD switchable
    >OSD Menu, control over coaxial cable
    >DWDR, Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >3.6mm fixed lens (2.8mm, 6mm, 8mm optional)
    >Max. IR LEDs length 40m, Smart IR
    >IP67, DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

    Learn More
  5. DAHUA HAC-HFW2221R-Z-IRE6

    HAC-HFW2221R-Z-IRE6-0722 - DAHUA HAC-HFW2221R-Z-IRE6-0722 2.1Megapixel 1080P Water-proof WDR HDCVI IR-Bullet Camera without logo

    $94.00

    >1/2.7" 2.1Megapixel CMOS
    >25/30fps@1080P,25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD dual-output
    >OSD Menu, control over coaxial cable
    >WDR(120dB), Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >7~22mm motorized lens
    >Max. IR LEDs length 60m, Smart IR
    > IP67, DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

    Learn More
  6. DAHUA HAC-HDBW2221R-Z-DP

    HAC-HDBW2221R-Z-DP - DAHUA HAC-HDBW2221R-Z-DP 2.1Megapixel 1080P Vandal-proof WDR IR HDCVI Dome Camera without logo

    $82.00

    >1/2.7" 2.1Megapixel CMOS
    >25/30fps@1080P,25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD dual-output
    >OSD Menu, control over coaxial cable
    >WDR(120dB), Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >2.7~12mm motorized lens
    >Max. IR LEDs length 30m, Smart IR
    > IP67, AC24V/DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

    Learn More
  7. DAHUA HAC-HDW2221EM-A

    HAC-HDW2221EM-A - DAHUA HAC-HDW2221EM-A 2.1Megapixel 1080P Water-proof WDR IR HDCVI Dome Camera without logo

    $52.00

     

    >1/2.7" 2.1Megapixel CMOS
    >25/30fps@1080P,25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD dual-output
    >OSD Menu, control over coaxial cable; Built-in MIC

    >WDR(120dB), Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >3.6mm fixed lens (2.8mm, 6mm, 8mm optional)
    >Max. IR LEDs length 50m, Smart IR
    > IP67, DC12V
    >without Logo,English firmware
    >100% original products manufactured by DAHUA


    The delivery time is 25 working days.

    Learn More
  8. HAC-HDW2221EM - DAHUA HAC-HDW2221EM 2.1Megapixel 1080P Water-proof WDR IR HDCVI Dome Camera without logo

    HAC-HDW2221EM - DAHUA HAC-HDW2221EM 2.1Megapixel 1080P Water-proof WDR IR HDCVI Dome Camera without logo

    $50.00

    >1/2.7" 2.1Megapixel CMOS
    >25/30fps@1080P,25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD dual-output
    >OSD Menu, control over coaxial cable
    >WDR(120dB), Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >3.6mm fixed lens (2.8mm, 6mm, 8mm optional)
    >Max. IR LEDs length 50m, Smart IR
    > IP67, DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

    Learn More
  9. DAHUA HAC-HFW2221R-Z-IRE6-DP

    HAC-HFW2221R-Z-IRE6-DP - DAHUA HAC-HFW2221R-Z-IRE6-DP 2.1Megapixel 1080P Water-proof WDR HDCVI IR-Bullet Camera without logo

    $90.00

    >1/2.7" 2.1Megapixel CMOS
    >25/30fps@1080P,25/30/50/60fps@720P
    >High speed, long distance real-time transmission
    >HD and SD dual-output
    >OSD Menu, control over coaxial cable
    >WDR(120dB), Day/Night(ICR), AWB, AGC, BLC, 3DNR
    >2.7~12mm motorized lens
    >Max. IR LEDs length 60m, Smart IR
    > IP67,AC24V/DC12V

    >without Logo,English firmware
    >100% original products manufactured by DAHUA

    The delivery time is 25 working days.

    Learn More
  10. HAC-HDW2401M

    HAC-HDW2401M - DAHUA HAC-HDW2401M 4MP HDCVI WDR IR Eyeball Camera DH-HAC-HDW2401M without logo

    $58.00

     

    4MP HDCVI WDR IR Eyeball Camera

     


    > 120dB True WDR, 3DNR
    > Max 4MP real-time
    > HD and SD dual-output
    > 3.6mm fixed lens (2.8mm, 6mm optional)
    > Max. IR length 30m, Smart IR
    > IP67, DC12V
    > 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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