Monthly Archives: December 2018

Cat detector with Tensorflow on a Raspberry Pi 3B+

Like this
Download Raspian Stretch with Desktop    

Burn a card with Etcher.

(Assuming a Mac) Enable ssh

touch /Volumes/boot/ssh

Put a wifi password in

nano /Volumes/boot/wpa_supplicant.conf
country=GB
ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev
update_config=1

network={
  ssid="foo"
  psk="bar"
}

Connect the Pi camera, attach a dial to GPIO pin 12 and ground, boot up the Pi, ssh in, then

sudo apt-get update
sudo apt-get upgrade
sudo raspi-config # and enable camera; reboot

install tensorflow

sudo apt install python3-dev python3-pip
sudo apt install libatlas-base-dev
pip3 install --user --upgrade tensorflow

Test it

python3 -c "import tensorflow as tf; tf.enable_eager_execution(); print(tf.reduce_sum(tf.random_normal([1000, 1000])))"

get imagenet

git clone https://github.com/tensorflow/models.git
cd ~/models/tutorials/image/imagenet
python3 classify_image.py

install openCV

pip3 install opencv-python
sudo apt-get install libjasper-dev
sudo apt-get install libqtgui4
sudo apt install libqt4-test
python3 -c 'import cv2; print(cv2.__version__)'

install the pieces for talking to the camera

cd ~/models/tutorials/image/imagenet
pip3 install imutils picamera
mkdir results

download edited version classify_image

curl -O https://gist.githubusercontent.com/libbymiller/d542d596566774a35752d134f80b1332/raw/471f066e4dc498501bab7731a07fa0c1926c1575/classify_image_dial.py

Run it, and point at a cat

python3 classify_image_dial.py