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1. Introduction > What Is a Vision System?

What Is a Vision System?

A vision system is something that evaluates data from an image source (typically a camera), extracts data about those images, and does something with the results. For example, consider a parking space monitor. This system watches a parking space, and detects parking violations in which unauthorized cars attempt to park in the spot. If the owner’s car is in the space or if the space is empty, then there is no violation. If someone else is parked in the space, then there is a problem. Figure 1-2 outlines the overall logic flow for such a system.

Diagram of parking spot vision system

Figure 1-2. Diagram of parking spot vision system

Although conceptually simple, the problem presents many complexities. Lighting conditions affect color detection and the ability to distinguish the car from the background. The car may be parked in a slightly different place each time, hindering the detection of the car versus an empty spot. The car might be dirty, making it hard to distinguish between the owner’s and the violator’s cars. The parking spot could be covered in snow, making it difficult to tell whether the parking spot is empty or not.


  

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