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%matplotlib inline

import cv2
import matplotlib.pyplot as plot

getting one image from webcam



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camera = cv2.VideoCapture(0)



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retval, image = camera.read()



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camera.release()



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plot.imshow(image)

save image and read it back



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filename = 'first_image.png'
cv2.imwrite(filename, image)



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image2 = cv2.imread(filename)



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plot.imshow(image)



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type(image)



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image.shape, image.dtype



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rgb_image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
plot.imshow(rgb_image)



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r_image = rgb_image[:, :, 0]
plot.imshow(r_image, cmap='gray')



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rgb_image[:, :, 1:] = 0
plot.imshow(rgb_image)



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rgb_image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
rgb_image[100:200, 100:200, 0] = 255
plot.imshow(rgb_image)



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rgb_image = cv2.cvtColor(image, cv2.COLOR_BGR2RGB)
roi = rgb_image[100:200, 100:200]
plot.imshow(roi)



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