rotation-Bicubic resampling -using OpenCV python

asked 2017-09-08 03:55:17 -0600

Arun1994
11 ●3

updated 2017-09-08 04:26:14 -0600

Hey !

I am trying to rotate an image using cv2.getRotationMatrix2D(center, angle, scale) .
dst = cv2.warpAffine(img,M,(cols,rows))

how do I manipulate the interpolation method? I would like to use bicubic method .

Thanks

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Comments

check cv.WarpAffine. you can set interpolation flag to INTER_CUBIC

Ziri ( 2017-09-08 07:51:34 -0600 )edit

I get the following error

ModuleNotFoundError: No module named 'cv'

I have tried to use all possible installation methods to install 'cv' . cv2 works fine but not cv :(

Arun1994 ( 2017-09-12 04:33:21 -0600 )edit

Using cv2.INTER_CUBIC, the flags work . cv.warpaffine does not work even using import cv2.cv as cv .

Arun1994 ( 2017-09-13 06:16:17 -0600 )edit

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answered 2017-09-12 07:32:57 -0600

Arun1994
11 ●3

This works for me now :)

import cv2
import matplotlib.pyplot as plt
img = cv2.imread('1.jpg',0)
rows,cols = img.shape
M = cv2.getRotationMatrix2D((cols/2,rows/2),-40,1) # the format is cv2.getRotationMatrix2D(center, angle, scale) 
dst = cv2.warpAffine(img,M,(cols,rows),flags=cv2.INTER_CUBIC)
plt.imshow(dst)