Getting Frames from YouTube

YouTube has a wealth of data but often you don't feel like downloading it all to disk. How can we stream video to python and then access the frame data?

Invariance, Scale and Prediction

Thinking about how we can represent a cow.

Why Computer Vision Is Wrong

Computer vision engineers need to be less Linus Torvalds and more Erik Weisz.

Playing Around with Retinal-Cortex Mappings

Here is a little notebook where I play around with converting images from a polar representation to a Cartesian representation. This is similar to the way our bodies map information from the retina onto the early visual areas. Mapping from the visual field (A) to the thalamus (B) to the cortex (C) These ideas are … Continue reading Playing Around with Retinal-Cortex Mappings →

Face Detection with the Raspberry Pi Camera Board

I have a very basic face detection routine running with the Raspberry Pi camera board. To do this I used Robidouille's library functions (see previous post). I then modified the raspicam_cv.c example to use the face detection routine from Learning OpenCV. There were some tweaks so I will post the code below. You also need … Continue reading Face Detection with the Raspberry Pi Camera Board →

Hacker News Update: Raspicam & WeMo

A quick update on my recent discoveries. Raspicam I now have a Raspberry Pi Camera Board (Raspicam)! There is a brilliant combo deal on at the moment allowing you to buy a Raspicam, Model A + 4GB SD card for about £35 (including VAT + shipping!)! That's £35 for a device that can run OpenCV … Continue reading Hacker News Update: Raspicam & WeMo →

Face Tracking Robot Arm

Ha - awesome - I have made a face tracking robot arm. The 12 year-old me is so jealous.Here's how I did it (on Ubuntu 12.04 but should be portable to the Raspberry Pis):I installed SimpleCV: - http://simplecv.org/ .(I love this - makes it so simple to prototype.)I built this robot arm: - http://www.maplin.co.uk/robotic-arm-kit-with-usb-pc-interface-266257 .I installed pyusb: … Continue reading Face Tracking Robot Arm →

Digit Recognition for an LCD Screen

While I wait for a £1.75 USB LED light to solve my cupboard lumination problem I thought I would investigate digit recognition for an LCD screen.Turns out some clever people before me have considered the same problem from the point of view of allowing the blind to read displays.I found some good ideas in this … Continue reading Digit Recognition for an LCD Screen →

Setting up a Webcam for Stills in Raspberry Pi

First attempt: a Logitech Quickcam:This was detected when I plugged it in. Running lsusb gave me the following output:Then I tried the example described here: http://silicondelight.com/2012/07/grabbing-frames-from-webcam-with-a-raspberry-pi/ However, I kept getting errors relating to the v4l2 libraries. I tried a powered hub - a Logik Hub from Currys snipped as described here - http://www.raspberrypi.org/phpBB3/viewtopic.php?f=28&t=8926 . The … Continue reading Setting up a Webcam for Stills in Raspberry Pi →