# -*- coding: utf-8 -*-
"""
Created on Wed Jun 12 10:00:35 2019

@author: Administrator
"""
import numpy as np
import matplotlib.pyplot as plt
from matplotlib import style
import matplotlib
 
matplotlib.rcParams['font.family']='SimHei'   #黑体
style.use('_classic_test')
a={0: 32939, 1: 15730, 2: 13427, 3: 11523, 4: 9540, 5: 7957, 6: 6607, 7: 5697, 8: 4834, -1: 15294, -2: 13637, -3: 11479, -4: 9683, -5: 7979, -6: 6878, -7: 5631, -8: 4871}

plt.bar(a.keys(),a.values(),color=['black'],align='center')
plt.xticks((0,1,2,3,4,5,6,7,8,-1,-2,-3,-4,-5,-6,-7,-8),('0','1','2','3','4','5','6','7','8','-1','-2','-3','-4','-5','-6','-7','-8'))
plt.title('original coefficient')
plt.savefig('original.png')
plt.show()

b={0: 32939, 1: 15730, 2: 12552, 3: 12398, 4: 8739, 5: 8758, 6: 6165, 7: 6139, 8: 4487, -1: 15294, -2: 12721, -3: 12395, -4: 8891, -5: 8771, -6: 6319, -7: 6190, -8: 4463}
c={0: 47068, 1: 13416, 2: 13519, 3: 10075, 4: 9545, 5: 7077, 6: 6650, 7: 5016, 8: 4754, -1: 13308, -2: 13668, -3: 10124, -4: 9571, -5: 7249, -6: 6591, -7: 5098, -8: 4733}
d={0: 59320, 1: 13618, 2: 11987, 3: 9875, 4: 8328, 5: 6860, 6: 5883, 7: 4910, 8: 4239, -1: 13692, -2: 11976, -3: 9976, -4: 8428, -5: 7007, -6: 5834, -7: 4964, -8: 4190}
plt.bar(b.keys(),b.values(),color=['black'],align='center')
plt.xticks((0,1,2,3,4,5,6,7,8,-1,-2,-3,-4,-5,-6,-7,-8),('0','1','2','3','4','5','6','7','8','-1','-2','-3','-4','-5','-6','-7','-8'))
plt.title('after Jsteg coefficient')
plt.savefig('Jsteg.png')
plt.show()

# 黑色嵌入1，白色嵌入0
plt.bar(c.keys(),c.values(),color=['black'],align='center')
plt.xticks((0,1,2,3,4,5,6,7,8,-1,-2,-3,-4,-5,-6,-7,-8),('0','1','2','3','4','5','6','7','8','-1','-2','-3','-4','-5','-6','-7','-8'))
plt.title('after F3 coefficient')
plt.savefig('F3.png')
plt.show()

plt.bar(d.keys(),d.values(),color=['grey','black','white','black','white','black','white','black','white','white','black','white','black','white','black','white','black'],align='center')
plt.xticks((0,1,2,3,4,5,6,7,8,-1,-2,-3,-4,-5,-6,-7,-8),('0','1','2','3','4','5','6','7','8','-1','-2','-3','-4','-5','-6','-7','-8'))
plt.title('after F4 coefficient')
plt.savefig('F4.png')
plt.show()
