python 图像直方图
最近要搞图像处理，要做直方图，老师用MFC弄了一大坨代码看着真心蛋疼。。。正好这一段在学python，就拿来用了，非常方便强大，核心代码就几行~
用了三个模块，PIL，numpy和matplotlib
第一行加一句这个，基本完美解决中文字体问题
#-*- coding: utf-8 -*-
代码：
1 #-*- coding: utf-8 -*- 2 import PIL.Image as Image 3 import numpy as np 4 import matplotlib.pyplot as pl 5 import matplotlib.image as mpimg 6 from matplotlib.font_manager import FontProperties 7 import win32ui 8 font = FontProperties(fname=r"c:\windows\fonts\simsun.ttc", size=12) 9 dlg = win32ui.CreateFileDialog(1) 10 dlg.SetOFNInitialDir('H:\desk\Py_Study\新建文件夹') 11 dlg.DoModal() 12 13 filename = dlg.GetPathName() 14 o_img = Image.open(filename) 15 img1 = o_img.convert('RGB') 16 a = np.asarray(img1) #转存成RGB‘数组’ 17 ax1 = pl.subplot(321) #划分成5块 18 ax2 = pl.subplot(322) 19 ax3 = pl.subplot(323) 20 ax4 = pl.subplot(324) 21 ax5 = pl.subplot(313) 22 23 pl.sca(ax1) 24 pl.xlabel(u'蓝色', fontproperties = font) 25 pl.hist(a[:,:,0].flatten(),bins = 256, histtype = "step", color = 'blue') # blue 26 pl.sca(ax2) 27 pl.xlabel(u'绿色', fontproperties = font) 28 pl.hist(a[:,:,1].flatten(),bins = 256, histtype = "step", color = 'green') # green 29 pl.sca(ax3) 30 pl.xlabel(u'红色', fontproperties = font) 31 pl.hist(a[:,:,2].flatten(),bins = 256, histtype = "step", color = 'red') # red 32 pl.sca(ax4) 33 pl.xlabel(u'灰度', fontproperties = font) 34 pl.hist(a[:,:,2].flatten() * 0.299 + a[:,:,1].flatten() * 0.587 + a[:,:,0].flatten() * 0.114 ,bins=256, histtype="step", color = 'gray') 35 pl.sca(ax5) 36 pl.imshow(o_img) 37 pl.show()
效果：
