Bodgers – Pi Camera & OpenCV

This week in the Bodgers group we looked at the Pi Camera Module which is a high quality image sensor add-on board for the Raspberry Pi. You can capture images  from the command line with:

 raspistill -o cam.jpg 

This will take a jpeg picture called cam which will be saved in your home folder.

You can take a picture from your Python script with:


from time import sleep
from picamera import PiCamera

camera = PiCamera()
camera.resolution = (1024, 768)
camera.start_preview()
# Camera warm-up time
sleep(2)
camera.capture('foo.jpg')

This will save a picture called foo in the folder you ran your script from.

OpenCV (Open source computer vision) is a library of programming functions mainly aimed at real-time computer vision. We tried a couple of scripts out, one from the Hackers group, thanks Kevin, that detects colours and another one that detects shapes, we will be looking at this much more in the next few sessions but next Saturday we will look at using an Arduino and a Raspberry Pi together.

See you all then.

Declan, Dave and Alaidh

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