mirror of
https://github.com/undera/pylgbst.git
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140 lines
4.3 KiB
Python
140 lines
4.3 KiB
Python
import logging
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import matplotlib.pyplot as plt
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import time
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from threading import Thread
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import numpy
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from PIL import Image
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class Tracer(object):
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def __init__(self, fname):
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super(Tracer, self).__init__()
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self.threshold = 64
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self.orig = Image.open(fname)
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self.conv1 = self.remove_transparency(self.orig)
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self.conv1 = self.conv1.convert("L")
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self.src = numpy.asarray(self.conv1)
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self.dst = numpy.copy(self.src)
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self.dst.fill(False)
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self.mark = numpy.copy(self.dst)
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# start in center
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self.height, self.width = self.dst.shape[0:2]
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self.posy = self.height / 2
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self.posx = self.width / 2
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def remove_transparency(self, im, bg_colour=(255, 255, 255)):
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# from https://stackoverflow.com/questions/35859140/remove-transparency-alpha-from-any-image-using-pil
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# Only process if image has transparency (http://stackoverflow.com/a/1963146)
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if im.mode in ('RGBA', 'LA') or (im.mode == 'P' and 'transparency' in im.info):
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# Need to convert to RGBA if LA format due to a bug in PIL (http://stackoverflow.com/a/1963146)
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alpha = im.convert('RGBA').split()[-1]
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# Create a new background image of our matt color.
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# Must be RGBA because paste requires both images have the same format
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# (http://stackoverflow.com/a/8720632 and http://stackoverflow.com/a/9459208)
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bg = Image.new("RGBA", im.size, bg_colour + (255,))
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bg.paste(im, mask=alpha)
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return bg
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else:
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return im
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def trace(self):
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while self._has_unchecked_pixels():
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# go circles to find a pixel in src
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if not self._spiral_till_pixel():
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break
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# move until we find new pixels
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self._move_while_you_can()
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def _has_unchecked_pixels(self):
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ix, iy = numpy.where(self.mark == False)
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return len(ix) or len(iy)
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def _spiral_till_pixel(self):
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radius = 1
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direction = 0
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offset = 0
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while self._has_unchecked_pixels():
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in_lower = self.posy < self.height and self.posx < self.width
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in_upper = self.posy >= 0 and self.posx >= 0
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if in_lower and in_upper and not self.mark[self.posy][self.posx]:
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if self.src[self.posy][self.posx] < self.threshold:
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return True
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self.mark[self.posy][self.posx] = True
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if direction == 0:
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self.posx += 1
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self.posy += 0
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elif direction == 1:
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self.posx += 0
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self.posy += 1
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elif direction == 2:
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self.posx += -1
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self.posy += 0
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elif direction == 3:
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self.posx += 0
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self.posy += -1
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else:
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pass
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offset += 1
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if offset >= radius:
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# time.sleep(0.01)
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offset = 0
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direction += 1
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if direction > 3:
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direction = 0
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if direction in (0, 2):
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radius += 1
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logging.debug("End of image")
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return False
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def _move_while_you_can(self):
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# time.sleep(0.1)
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logging.debug("%s:%s=%s", self.posy, self.posx, self.src[self.posy][self.posx])
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self.mark[self.posy][self.posx] = True
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self.dst[self.posy][self.posx] = True
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# self.posx += 1
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# self.posy += 1
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class TracerVisualizer(object):
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def __init__(self, tracer):
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"""
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:type tracer: Tracer
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"""
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self.tracer = tracer
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def run(self):
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tracer = self.tracer
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fig, ((ax1, ax2), (ax3, ax4)) = plt.subplots(nrows=2, ncols=2)
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ax1.imshow(tracer.orig)
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ax2.imshow(tracer.src)
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plt.show(block=False)
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thr = Thread(target=tracer.trace)
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thr.setDaemon(True)
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thr.start()
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while plt.get_fignums(): # weird trick to react on close
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ax3.set_title("%s:%s" % (tracer.posx, tracer.posy))
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ax3.imshow(tracer.mark, cmap='gray')
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ax4.imshow(tracer.dst, cmap='gray')
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plt.pause(0.5)
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if __name__ == "__main__":
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logging.basicConfig(level=logging.DEBUG)
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trc = Tracer("test1.png")
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TracerVisualizer(trc).run()
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time.sleep(5)
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