POWERING IP
In this camera test, we learned about image sensors and how they interact with other supporting components. The same sensor, ISP and codec SoC deliver markedly different results, displaying each manufacturer's unique approach to imaging. Depending on the application, no camera is completely good or bad.
Many network cameras do not include a composite video output connection (Video Out) to the display, which is sorely missing. However, autoback focus (ABF) was included on most cameras. ABF was either on the hardware or the camera's software as Focus Assist, saving installer time during setup. All of the cabling connections also have better design, such as antislip plugs for easier installation.
Lens selection continues to be an issue, as seen in our testing. Manufacturers struggle between spherical and aspherical lens recommendations for their cameras. Each lens type has its strengths and weaknesses, but cost is a major factor. During the test, we used lenses from Computar, Fujinon, Tamron and Tokina to see how each camera measured up in extreme lighting conditions and performed for motion. Each manufacturer was allowed to select a camera lens at their discretion. Based on our results, it is hard to choose one lens that performs well at absolutely all focal points and illumination levels.
Power supply continues to be an issue for network cameras. The differences were noticeable between CCD and CMOS image sensors during our tests, as CCDs require more power. Along with added processing to crunch 2-megapixel images and onboard analytics, the CCD cameras were far more power-hungry than the CMOS models. High power usage results in high temperatures, which cannot be resolved with fans for outdoor models.
Apart from CCD power usage, IR network cameras will put unique demands on PoE power supplies. This is something that may be overlooked by installers or users. The good news is that PoE transmission supplies are becoming more affordable. With more competition and sales volume in PoE transmission, high-power PoE modules are no longer exclusive to high-end network cameras.
DEVIL IN THE DETAILS
The above sums up known issues with network cameras. Several nonelectrical areas still need work, such as port placement. These details may not have an overwhelming impact on the product itself, but make cameras difficult to use for operators and installers. Manufacturers need to understand user needs, rather than focusing on image clarity or color saturation alone.
Our camera test was conducted in the same conditions monitoring identical objects, so many issues surfaced during side-by-side comparison. While they were not necessarily quality or manufacturing flaws, camera adjustment differences were evident. This was particularly true for digital shutter and exposure. For a test environment with dark-to-bright lighting changes, the flicker from the light source sometimes interfered with the frequency of the digital shutter and exposure, which matched the light source. While the test setup was imperfect, it is not unlikely for the same thing to occur in the real world.
Network cameras have come a long way. However, future development requires installers to consult with competent on-site technicians. This will enrich the dialogue with hands-on experience and technical know-now, resulting in practical products that deliver real-world results.