Having vision capability is a real advantage for your biped robot; you'll use this functionality in lots of different applications. Fortunately, adding hardware and software for vision is both easy and inexpensive. There are two choices as far as vision hardware is concerned. You can add a USB webcam to your system, or you can add RaspiCam, a camera designed specifically for Raspberry Pi.
Connecting a USB camera is very easy. Just plug it into the USB slot. To make sure that your device is connected, type lsusb. You should see the following:
This shows a Creative Webcam located at Bus 001 Device 004: ID 041e:4095. To make sure that the system sees this as a video device, type ls /dev/v* command and you should see something like the following:
The /dev/video0 is the webcam device. Now that your device is connected, let's actually see if you can capture images and video. There are several tools that can allow you to...