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The videoCapture does exactly what you want.

http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html?highlight=video#VideoCapture

Steps to follow:

• Create the videoCapture interface, giving the index of your webcam to it.
• Grab a frame, which is automatically stored in a Mat element.
• Use the imsave functionality to store the Mat into an image.

http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html?highlight=imwrite#cv2.imwrite

The videoCapture VideoCapture does exactly what you want.

http://docs.opencv.org/modules/highgui/doc/reading_and_writing_images_and_video.html?highlight=video#VideoCapture

Steps to follow:

• Create the videoCapture VideoCapture interface, giving the index of your webcam to it.
• Grab Grab a frame, which is automatically stored in a Mat element.Mat
• Use the imsave imwrite functionality to store the Mat into an image.