INSIGHTS
A lens with auto back focus is essential for image quality. “For a fixed dome, what's really important is a good lens that's easy to adjust,” Corrall said. “You can go to any focal length, and it will stay in focus. That's important to installers and makes sure the focus is always crisp.”
Quality Domes Hold No Viewing Limits Ⅱ
Date: 2011/03/25
Source: a&s International
Soft Powers
In-house design can reduce cost for the PTZ camera block, which is usually the most expensive component. “Our own R&D allows us to control cost, and feature development is not limited by thirdparty vendors,” said Garrett Li, Marketing Manager for DynaColor.
Beyond components,good software affects dome image quality as well. Manufacturers A and B may use the same DSP and an identical image sensor, but still get different results. “I can show you two cameras using the same hardware but running different software, and the images can look like they're from two completely different cameras,” Corrall said. “Without quality software inside the camera, the quality of the components used doesn't really matter.”
Image stabilization is required to correct the vibration while the PTZ is moving, Corrall added. “A user-friendly interface helps installers save time while setting presets.”
Balancing Act
Selecting the best dome is not rocket science, but the fastest processor, most sensitive image sensor and best dome drive will add up to major sticker shock. As most applications do not require comprehensive functionality, actual usage considerations will determine what dome can deliver at an acceptable price point. Product quality and reliability remain essential for value no matter what the price is, but different components will result in different costs.
Dome selection boils down to site and budget considerations. Some of the same issues also apply to IP domes, which have gained market share. In our next article, we examine performance concerns for network-enabled domes.