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analyse.py
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analyse.py
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#!/usr/bin/env python
#import os,sys
import Image
import ImageDraw
#import numpy
#import math
import pylab
def bresenham(x0, y0, x1, y1):
"""https://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm"""
dx = abs(x1-x0)
dy = abs(y1-y0)
sx = 1 if x0 < x1 else -1
sy = 1 if y0 < y1 else -1
err = dx-dy
yield x0,y0
while x0 != x1 or y0 != y1:
e2 = 2*err
if e2 > -dy:
err = err - dy
x0 = x0 + sx
if e2 < dx:
err = err + dx
y0 = y0 + sy
yield x0, y0
class analyse(object):
def __init__(self):
self.tmpPath = "tmp/"
def analyseImage(self, imageFullPath, xStart, yStart, xStop, yStop):
im = Image.open(imageFullPath)
print im.bits, im.size, im.format
pixelsInt = [im.getpixel((x,y)) for x,y in bresenham(xStart, yStart, xStop, yStop)]
indices = range(1, len(pixelsInt)+1)
pylab.plot(indices, pixelsInt)
my_dpi = 80
#pylab.figure(figsize=(600/my_dpi, 500/my_dpi), dpi=my_dpi)
pylab.figure(1, figsize=(3.25, 3))
draw = ImageDraw.Draw(im)
draw.line([(xStart, yStart),(xStop, yStop)], fill=128)
del draw
im.save(self.tmpPath + "line.png", "PNG")
#pylab.show()
pylab.savefig(self.tmpPath + "graph.png", dpi=my_dpi)
pylab.close()
#600x500
if __name__ == "__main__":
xStart = 170
yStart = 10
xStop = 170
yStop = 220
an = analyse()
an.analyseImage("images/IR_0485.jpg", xStart, yStart, xStop, yStop)