On Monday, June 14, 2010 10:32:48 pm Daniel Jones wrote:
> Hi matplotlib users,
>
> I'm trying to write a script to loop through a bunch of tiff files,
> display each image, and choose to accept or reject each image.
> Something like:
>
> for f in files:
> im = imread(f)
> imshow(im)
> # Accept keyboard input to accept or reject image
> # Close the image
>
>
> The problem is that I can't figure out how to show multiple images in
> series. I can't use matplotlib.pyplot.show() because that can only be
> used once at the very end of a script, and I don't want to show all
> the images at once. matplotlib.pyplot.draw() seemed like a promising
> candidate, but it only seems to work if I've already used show() once
> in the script. It seems like there should be a simple way to do this,
> but I can't quite seem to find it.
>
> Thanks,
> Daniel
Hi Daniel,
in the attached script I propose two solutions for your problem (just
uncomment first region and comment second to test the first proposal). The
first
uses plt.waitforbuttonpress and the second key-press-events.
Kind regards,
Matthias
import numpy as np
import matplotlib.pyplot as plt
file_list = ['a', 'b', 'c', 'd']
ax = plt.subplot(111)
### vvv --- first attempt using 'plt.waitforbuttonpress' -----------------------
##plt.hold(False)
##for index, file in enumerate(file_list):
## # im = plt.imread(file)
## im = np.random.uniform(size=(30, 20)) # some random data
## ax.imshow(im)
## ax.set_title("use (key-press) or reject (button press) image %i" % (index))
## plt.draw()
## result = plt.waitforbuttonpress()
## print "result :", result
##plt.show()
### ^^^ --- first attempt using 'plt.waitforbuttonpress' -----------------------
# vvv --- second attempt using 'plt.connect and key press events' ------------
def event_fct(event):
""" evaluate key-press events """
global counter
if event is None:
counter = 0
else:
if event.key in ['r', 'u']:
if event.key in 'r':
print "reject image"
elif event.key in 'u':
print "use image"
# go to next image
counter += 1
else:
print "Key >%s< is not defined" % (event.key)
return
# im = plt.imread(file_list[counter])
im = np.random.uniform(size=(30, 20)) # some random data
ax.imshow(im)
ax.set_title("[u]se or [r]eject image %i by key press" % (counter))
plt.draw()
event_fct(None) # initial setup
plt.connect('key_press_event', event_fct)
plt.show()
# ^^^ --- second attempt using 'plt.connect and key press events' ------------
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