Quick and dirty pure python library for capturing images from the Lepton over SPI (for example, on a Raspberry PI).
numpy modules, if you don't have them already. On a Debian-based system you can probably do this:
$ sudo apt-get install python-opencv python-numpy
You can run the examples in the working directory, but a distutils setup is included to install into site-packages for distribution:
$ sudo python setup.py install
import numpy as np import cv2 from pylepton import Lepton with Lepton() as l: a,_ = l.capture() cv2.normalize(a, a, 0, 65535, cv2.NORM_MINMAX) # extend contrast np.right_shift(a, 8, a) # fit data into 8 bits cv2.imwrite("output.jpg", np.uint8(a)) # write it!
Image data from
capture() is 12-bit, non-normalized (raw sensor data). Here we contrast extend it since the bandwidth tends to be narrow.
capture() returns a tuple that includes a unique frame ID, as lepton frames can update at ~27 Hz, but only unique ones are returned at ~9 Hz. Currently, this is just a simple sum, but ideally this will turn into a real frame ID from telemetry once this feature is implemented.
Note also that the Lepton contructor can take as an optional argument the SPI device on which to find the Lepton. If in your system that device is
/dev/spidev0.1, you can instantiate lepton as such:
... with Lepton("/dev/spidev0.1") as l: ...
python-picamera, a Raspberry PI, and compatible camera such as http://www.adafruit.com/products/1367
$ sudo apt-get install python-picamera $ pylepton_overlay --help Usage: pylepton_overlay [options] Options: -h, --help show this help message and exit -f, --flip-vertical flip the output images vertically -a ALPHA, --alpha=ALPHA set lepton overlay opacity
To get a 100% lepton overlay (note camera installation still required):
$ pylepton_overlay -a 255
Note that this program will output any image format that opencv knows about, just specify the output file format extension (e.g.
$ pylepton_capture --help Usage: pylepton_capture [options] output_file[.format] Options: -h, --help show this help message and exit -f, --flip-vertical flip the output image vertically
To capture a png file named
$ pylepton_capture output.png