一.直方图
代码:
from PIL import Image
from pylab import *
from matplotlib.font_manager import FontProperties
font = FontProperties(fname=r"c:\windows\fonts\SimSun.ttc", size=14)
im = array(Image.open('L.jpg').convert('L')) # 打开图像,并转成灰度图像
figure()
subplot(121)
gray()
contour(im, origin='image')
axis('equal')
axis('off')
title(u'图像轮廓', fontproperties=font)
subplot(122)
hist(im.flatten(), 128)
title(u'图像直方图', fontproperties=font)
plt.xlim([0,260])
plt.ylim([0,11000])
show()
图片:
二.直方图均衡化
代码:
# -*- coding: utf-8 -*-
from PIL import Image
from pylab import *
from PCV.tools import imtools
from matplotlib.font_manager import FontProperties
font = FontProperties(fname=r"c:\windows\fonts\SimSun.ttc", size=14)
im = array(Image.open('L.jpg').convert('L')) # 打开图像,并转成灰度图像
#im = array(Image.open('hjl.jpg').convert('L'))
im2, cdf = imtools.histeq(im)
figure()
subplot(2, 2, 1)
axis('off')
gray()
title(u'原始图像', fontproperties=font)
imshow(im)
subplot(2, 2, 2)
axis('off')
title(u'直方图均衡化后的图像', fontproperties=font)
imshow(im2)
subplot(2, 2, 3)
axis('off')
title(u'原始直方图', fontproperties=font)
#hist(im.flatten(), 128, cumulative=True, normed=True)
hist(im.flatten(), 128, normed=True)
subplot(2, 2, 4)
axis('off')
title(u'均衡化后的直方图', fontproperties=font)
#hist(im2.flatten(), 128, cumulative=True, normed=True)
hist(im2.flatten(), 128, normed=True)
show()
图片:
三.高斯滤波
代码:
from PIL import Image
from pylab import *
from numpy import *
from numpy import random
from scipy.ndimage import filters
from scipy.misc import imsave
from PCV.tools import rof
""" This is the de-noising example using ROF in Section 1.5. """
from matplotlib.font_manager import FontProperties
font = FontProperties(fname=r"c:\windows\fonts\SimSun.ttc", size=14)
im = array(Image.open('L.jpg').convert('L'))
U,T = rof.denoise(im,im)
G = filters.gaussian_filter(im,10)
# save the result
#imsave('synth_original.pdf',im)
#imsave('synth_rof.pdf',U)
#imsave('synth_gaussian.pdf',G)
# plot
figure()
gray()
subplot(1,3,1)
imshow(im)
#axis('equal')
axis('off')
title(u'原噪声图像', fontproperties=font)
subplot(1,3,2)
imshow(G)
#axis('equal')
axis('off')
title(u'高斯模糊后的图像', fontproperties=font)
subplot(1,3,3)
imshow(U)
#axis('equal')
axis('off')
title(u'ROF降噪后的图像', fontproperties=font)
show()
图片: