As a reliable and trusted source of information for the security industry, a&s conducted a test on HDCVI front-end imaging and storage devices to learn more about this technology. The test included 2 DH-HAC-HFW2200S waterproof, infrared high-definition HDCVI bullet cameras; two DH-HAC-HFW2200S waterproof, infrared high
As a reliable and trusted source of information for the security industry, a&s conducted a test on HDCVI front-end imaging and storage devices to learn more about this technology. The test included 2 DH-HAC-HFW2200S waterproof, infrared high-definition HDCVI bullet cameras; two DH-HAC-HFW2200S waterproof, infrared high-definition HDCVI mini dome cameras; and one HDCVI based DH-HCVR7808S hybrid DVR.
True Color Display
The true color display capabilities of HDCVI are confirmed in the test. The 2-megapixel camera supports 1080p and real-time, high-resolution transmission of 720p at a maximum frame rate of 60fps. The HDCVI-DVR supports 1080p to QCIF multi-resolution, and 1-30fps storage and transmission. It supports up to a maximum of 8 blocks of 4TB hard disks (enabling a maximum storage capacity of up to 32TB). The following results are obtained in tests where the DVR video parameters are set at a resolution of 1080p, frame rate of 25fps, and bandwidth of CBR 4Mbps.
1080p High-Definition Performance
After the high-definition images transmitted via HDCVI are demodulated by the DVR and processed via H.264 encoding and decoding, the horizontal and vertical resolutions of real-time image quality forwarded by HDMI can reach up to 950TVL. Furthermore, edge definition is close to 900TVL and 8-bit is easily identified on a 10-bit gray scale. The same image quality is achieved with both a 2-megapixel IP and HD-SDI camera. Color images are also consistent when compared against the 24 colors of the Color Checker.
The next test looks at performance of videos taken outdoors and indoors. First up, the images taken at noon on rainy days (<1000 Lux) are detailed, with branches hundreds of meters away remaining identifiable. Next, images taken in the evening with street lamps (>20Lux) are clear and transparent, with good noise control. Finally, the automatic gain control of the camera is good indoors, and under normal light conditions, images are clear and easy to view with moderate screen brightness.