How to realize the Wave effect of PS filter by Python
In this article Xiaobian for you to introduce in detail "Python how to achieve PS filter wave effects", the content is detailed, the steps are clear, the details are handled properly, I hope that this "Python how to achieve PS filter wave special effects" article can help you solve doubts, the following follow the editor's ideas slowly in-depth, together to learn new knowledge.
Using computer programming language to realize the wave effect of police officer filter
Importnumpyasnp
Fromskimageimportimg _ as _ float
Importmatplotlib.pyplotasplt
Fromskimageimportio
Importnumpy.matlib
Importmath
File _ name 2room'd: / VisualEffects/PSalgorithm/4. Jpg'
Img=io.imread (file_name2)
Img=img_as_float (img)
Row,col,channel=img.shape
Img_out=img*1.0
= 70.0
= 30.0
Degrees = 20.0
Center_x= (col-1) / 2.0
Center_y= (row-1) / 2.0
Xx=np.arange (col)
Yy=np.arange (line)
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 = degrees * NP. Sin (2 * Mathematics. Pi * YY _ dif/alpha) xx _ dif
Y = degrees * NP. Cos (2 * Mathematics. 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)
Foriiinrange (row):
Forjjirinrange (col):
New_xx=int_x [ii,jj]
New_yy=int_y [ii,jj]
Ifx_new [ii,jj] 0orx_new [ii,jj] col-1:
Go ahead
Ify_new [ii,jj] 0ory_new [ii,jj] row-1:
Go ahead
Img_out [ii,jj,] = IMG [new _ yy,new_xx,]
Figure (1)
Plt.title ('www.jb51.net')
Plt.imshow (img)
Plt.axis ('off')
Figure (2)
Plt.title ('www.jb51.net')
Plt.imshow (img_out)
Plt.axis ('off')
(appendix: PS filter-Wave wave)
%% wave
% wave effect
Chrominance control center
Clear all
Close all files
Add a path ('e:\ Photoshop algorithm\ image processing\ PSAlgorithm')
I=im read ('4. Jpg')
Image=double (I)
% Image=0.2989*I (: 1) 0.5870 yuan I (: 2) 0.1140yuan I (: 3)
[rows, columns, channels] = size (image)
R=floor (max (row,col) / 2)
Image _ New = Image
Degree = 30% control the degree of distortion
Center _ X = (col 1) / 2
Center _ Y = (first line) / 2
Fori=1:row
Forj=1:col
X0=j-Center _ X
Y0 = Center _ Ymuri
X = degree * sin (2 * pi * y0amp 128) x0
Y = degrees * cos (2 * pi * x0Uniq128) y0
Xerox col/2
Y=row/2-y
If (x1xcolylrow 1)
X1 = floor (x)
Y1 = floor (y)
P=x-x1
Q=y-y1
Image_new (iMaginj,) = 1murp) * (1Muiq) * Image (y1menx1,) p* (1merq) * Image (y1menx11,).
Q * (1murp) * Image (y1 1menx1,) p*q*Image (y11recoverx1,)
End
End
End
Figure, imshow (Image _ new/255); the running effect of this example Python:
Original drawing
Effect picture
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