这篇文章主要介绍了 Python 实现 PS 滤镜功能之波浪特效, 结合实例形式分析了 Python 实现 PS 滤镜波浪特效的原理与相关操作技巧, 需要的朋友可以参考下
本文实例讲述了 Python 实现 PS 滤镜功能之波浪特效分享给大家供大家参考, 具体如下:
这里用 Python 实现 PS 滤镜的波浪特效, 具体效果可以参考附录说明
- import numpy as np
- from skimage import img_as_float
- import matplotlib.pyplot as plt
- from skimage import io
- import numpy.matlib
- import math
- file_name2='D:/Visual Effects/PS Algorithm/4.jpg'
- img=io.imread(file_name2)
- img = img_as_float(img)
- row, col, channel = img.shape
- img_out = img * 1.0
- alpha = 70.0
- beta = 30.0
- degree = 20.0
- center_x = (col-1)/2.0
- center_y = (row-1)/2.0
- xx = np.arange(col)
- yy = np.arange(row)
- x_mask = numpy.matlib.repmat (xx, row, 1)
- y_mask = numpy.matlib.repmat (yy, col, 1)
- y_mask = np.transpose(y_mask)
- xx_dif = x_mask - center_x
- yy_dif = center_y - y_mask
- x = degree * np.sin(2 * math.pi * yy_dif / alpha) + xx_dif
- y = degree * np.cos(2 * math.pi * xx_dif / beta) + yy_dif
- x_new = x + center_x
- y_new = center_y - y
- int_x = np.floor (x_new)
- int_x = int_x.astype(int)
- int_y = np.floor (y_new)
- int_y = int_y.astype(int)
- for ii in range(row):
- for jj in range (col):
- new_xx = int_x [ii, jj]
- new_yy = int_y [ii, jj]
- if x_new [ii, jj] < 0 or x_new [ii, jj] > col -1 :
- continue
- if y_new [ii, jj] < 0 or y_new [ii, jj] > row -1 :
- continue
- img_out[ii, jj, :] = img[new_yy, new_xx, :]
- plt.figure (1)
- plt.title('www.phperz.com')
- plt.imshow (img)
- plt.axis('off')
- plt.figure (2)
- plt.title('www.phperz.com')
- plt.imshow (img_out)
- plt.axis('off')
- plt.show()
附录: PS 滤镜波浪 wave
%%% Wave
%%% 波浪效果
- clc;
- clear all;
- close all;
- addpath('E:\PhotoShop Algortihm\Image Processing\PS Algorithm');
- I=imread('4.jpg');
- Image=double(I);
- % Image=0.2989 * I(:,:,1) + 0.5870 * I(:,:,2) + 0.1140 * I(:,:,3);
- [row, col,channel]=size(Image);
- R=floor(max(row, col)/2);
- Image_new=Image;
Degree=30; % 控制扭曲的程度
- Center_X=(col+1)/2;
- Center_Y=(row+1)/2;
- for i=1:row
- for j=1:col
- x0=j-Center_X;
- y0=Center_Y-i;
- x=Degree*sin(2*pi*y0/128)+x0;
- y=Degree*cos(2*pi*x0/128)+y0;
- x=x+col/2;
- y=row/2-y;
- if(x>1 && x<col && y<row && y>1)
- x1=floor(x);
- y1=floor(y);
- p=x-x1;
- q=y-y1;
- Image_new(i,j,:)=(1-p)*(1-q)*Image(y1,x1,:)+p*(1-q)*Image(y1,x1+1,:)...
- +q*(1-p)*Image(y1+1,x1,:)+p*q*Image(y1+1,x1+1,:);
- end
- end
- end
- figure, imshow(Image_new/255);
本例 Python 运行效果:
原图
效果图
希望本文所述对大家 Python 程序设计有所帮助
来源: http://www.phperz.com/article/18/0225/363238.html