今天介紹一種基于高斯濾波和鄰域隨機采樣，生成一種毛玻璃的圖像特效，簡單來說，就是先對圖像做高斯濾波模糊，然后對模糊后的圖像，通過對鄰域的隨機采樣來賦予當前的像素點，這樣，生成的圖像有有一定的隨機擾動和模糊，看起來就像隔著一層毛玻璃在觀察圖像一樣。
# -*- coding: utf-8 -*-
"""
Created on Sun Aug 20 11:03:53 2017
@author: shiyi
"""
import matplotlib.pyplot as plt
from skimage.filters import gaussian
from scipy.misc import imsave, imread
import random
file_name='D:/Visual Effects/PS Algorithm/4.jpg';
img=imread(file_name)
g_img = gaussian(img, sigma=2, multichannel=True)
img_out = g_img.copy()
rows, cols, dpt = img.shape
p_size = 3
for i in range(p_size, rows-p_size, 1):
for j in range(p_size, cols-p_size, 1):
k1= random.random() - 0.5
k2= random.random() - 0.5
m=int (k1*(p_size*2-1))
n=int (k2*(p_size*2-1))
h=(i+m) % rows
w=(j+n) % cols
img_out[i, j, :] = g_img[h, w, :]
imsave('out.jpg', img_out)
plt.figure
plt.imshow(img_out)
plt.show()
#coding:utf-8
'''
毛玻璃效果
'''
import cv2
import numpy as np
src = cv2.imread('datas/images/f1.jpg')
dst = np.zeros_like(src)
rows,cols,_ = src.shape
offsets = 5
random_num = 0
for y in range(rows - offsets):
for x in range(cols - offsets):
random_num = np.random.randint(0,offsets)
dst[y,x] = src[y + random_num,x + random_num]
cv2.imshow('src',src)
cv2.imshow('dst',dst)
cv2.waitKey()
cv2.destroyAllWindows()
