On 07/07/2015 00:16, Agustin Cruz wrote:
On Monday, July 6, 2015 at 6:00:42 PM UTC-4, Mark Lawrence wrote:
On 06/07/2015 22:31, Agustin Cruz wrote:
I'm working on a Python - Raspberry Pi project in which I need to take about 30
images per second (no movie) and stack each 2D image to a 3D array using numpy
array, without saving each 2D capture as a file (because is slow).
I found this Python code to take images as fast as possible, but i don't know
how to stack all images fast to a 3D stack of images.
import io
import time
import picamera
#from PIL import Image
def outputs():
stream = io.BytesIO()
for i in range(40):
# This returns the stream for the camera to capture to
yield stream
# Once the capture is complete, the loop continues here
# (read up on generator functions in Python to understand
# the yield statement). Here you could do some processing
# on the image...
#stream.seek(0)
#img = Image.open(stream)
# Finally, reset the stream for the next capture
stream.seek(0)
stream.truncate()
with picamera.PiCamera() as camera:
camera.resolution = (640, 480)
camera.framerate = 80
time.sleep(2)
start = time.time()
camera.capture_sequence(outputs(), 'jpeg', use_video_port=True)
finish = time.time()
print('Captured 40 images at %.2ffps' % (40 / (finish - start)))
Does anyone of you know how to stack the 2D images taken in this code to a 3D
numpy array using Python and the Raspberry Pi camera module? Without saving
each 2D capture as a file
Best regards, AgustÃn
http://docs.scipy.org/doc/numpy/reference/generated/numpy.dstack.html is
the first hit on google for "numpy 3d array stack".
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
Hi Mark,
I know the dstack function can do the job, but i don't know how to implement it
in this case.
Sadly I don't know how either, but if I can find the above link in
seconds, I'm fairly certain that with a little searching you could find
something. Specific sites like nullege or koders might offer solutions.
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
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