Python openCV 画像の勾配

画像の勾配を動かしてみた。

import cv2
import numpy as np
from matplotlib import pyplot as plt

img = cv2.imread('pic.png',0)

laplacian = cv2.Laplacian(img,cv2.CV_64F)
#laplacian = cv2.Laplacian(img,cv2.CV_64F)
sobelx = cv2.Sobel(img,cv2.CV_64F,1,0,ksize=5)
sobely = cv2.Sobel(img,cv2.CV_64F,0,1,ksize=5)

plt.subplot(2,2,1),plt.imshow(img,cmap = 'gray')
plt.title('Original'), plt.xticks([]), plt.yticks([])
plt.subplot(2,2,2),plt.imshow(laplacian,cmap = 'gray')
plt.title('Laplacian'), plt.xticks([]), plt.yticks([])
plt.subplot(2,2,3),plt.imshow(sobelx,cmap = 'gray')
plt.title('Sobel X'), plt.xticks([]), plt.yticks([])
plt.subplot(2,2,4),plt.imshow(sobely,cmap = 'gray')
plt.title('Sobel Y'), plt.xticks([]), plt.yticks([])

plt.show()

import cv2
import numpy as np
import matplotlib.pyplot as plt

img = cv2.imread('pic2.png')

sobelx8u=cv2.Sobel(img,cv2.CV_8U,1,0,ksize=5)

sobelx64f=cv2.Sobel(img,cv2.CV_64F,1,0,ksize=5)
abs_sobel64f=np.absolute(sobelx64f)
sobel_8u = np.uint8(abs_sobel64f)

plt.subplot(1,3,1),plt.imshow(img,cmap = 'gray')
plt.title('Original'), plt.xticks([]), plt.yticks([])
plt.subplot(1,3,2),plt.imshow(sobelx8u,cmap = 'gray')
plt.title('Sobel CV_8U'), plt.xticks([]), plt.yticks([])
plt.subplot(1,3,3),plt.imshow(sobel_8u,cmap = 'gray')
plt.title('Sobel abs(CV_64F)'), plt.xticks([]), plt.yticks([])

plt.show()