本文用 Python 實現 PS 濾鏡的波浪特效

import numpy as np

from skimage import img_as_float

import matplotlib.pyplot as plt

from skimage import io

import numpy.matlib

import math

# 圖片位置

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.imshow (img)

plt.axis("off")

plt.figure (2)

plt.imshow (img_out)

plt.axis("off")

plt.show()

實現效果

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原文鏈接：https://www.cnblogs.com/mtcnn/p/9412417.html

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