How do you think the new GigE standards will influence the machine vision industry?
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A is for analog; C is for Camera Link®; G is for GigE Vision™. Throw in IEEE 1394, LVDS / RS-422, and USB, and you've a got a simmering pot of interface soup. However, whether you're making a gumbo, chowder, or bisque will depend on the ingredients you put into it. Building a machine vision system is similar; your choice of components will affect the final product. This article presents a strategy to help you choose the best interface for your application. It also discusses some of the factors that will help define your choices: image fidelity, bandwidth, compactness and cables, and determinism. Refer to Table 1 for a brief comparison of the most popular camera interfaces: analog, Camera Link®, IEEE 1394, GigE Vision™, and USB. With a bit of knowledge and the right questions, you'll also be better prepared to help your camera vendor (and machine vision vendor) help you.
It All Starts With the Camera!
Machine vision rookies often ask vendors the same question: What frame grabber do I need? The vendors always give the same answer: it depends on your camera. So, your first step is to choose the camera that fits your needs in terms of resolution, data rate, and more. This exercise in itself may reduce the number of interfaces to consider.
|Attribute||Preferred (alphabetical order)|
|Best image fidelity due to signaling||Camera Link®
|Best cable length (single segment)||Analog (standard)
Analog (non-standard for lower clock rates)
|Best vendor interchangeability||Analog (standard)|