52 lines
1.3 KiB
Python
52 lines
1.3 KiB
Python
# This script shows how to open a camera in OpenCV and grab frames and show these.
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# Kim S. Pedersen, 2022
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import cv2 # Import the OpenCV library
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def gstreamer_pipeline(capture_width=1024, capture_height=720, framerate=30):
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"""Utility function for setting parameters for the gstreamer camera pipeline"""
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return (
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"libcamerasrc !"
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"video/x-raw, width=(int)%d, height=(int)%d, framerate=(fraction)%d/1 ! "
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"videoconvert ! "
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"appsink"
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% (
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capture_width,
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capture_height,
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framerate,
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)
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)
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print("OpenCV version = " + cv2.__version__)
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# Open a camera device for capturing
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cam = cv2.VideoCapture(gstreamer_pipeline(), apiPreference=cv2.CAP_GSTREAMER)
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if not cam.isOpened(): # Error
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print("Could not open camera")
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exit(-1)
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# Open a window
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# WIN_RF = "Example 1"
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# cv2.namedWindow(WIN_RF)
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# cv2.moveWindow(WIN_RF, 100, 100)
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_, frame = cam.read()
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cv2.imSave('test.png', frame)
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# while cv2.waitKey(4) == -1: # Wait for a key pressed event
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# retval, frameReference = cam.read() # Read frame
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# if not retval: # Error
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# print(" < < < Game over! > > > ")
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# exit(-1)
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# # Show frames
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# cv2.imshow(WIN_RF, frameReference)
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# Finished successfully
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