Chapter 16. Video devices - V4L

Even if not widely diffused, capturing video images or recording videos can be integrated into an embedded device to accomplish several different tasks, such as remote monitoring, video surveillance, image processing, and so on.

In this chapter, after a brief explanation about how these devices are defined in a GNU/Linux system, we're going to see a simple usage of common video-acquisition devices and how we can turn our embedded kit into a surveillance camera or a remote image recorder.

What is a video device?

A video-capture device is a device that is able to convert an analog video signal (such as that produced by a video camera, analog TV tuners, or other analog sources) to digital video. Then, the resulting digital ...

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