RidgeRun Linux Camera Drivers/Examples/RB5: Difference between revisions

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 == OpenCV Examples ==
+The following examples shows some basic Python code using OpenCV to capture from either a USB camera or a MIPI CSI camera. To use the code make sure you have OpenCV installed in your Jetson board, use this command to install it:
+<pre>
+sudo apt-get install python3-opencv
+</pre>
+After the installation was completed, simply run the command (<code>camera_capture.py</code> contains the code shown below):
+<pre>
+python3 camera_capture.py
+</pre>
+=== USB camera ===
+The following Python code shows a basic example using <code>OpenCV</code> to capture from a USB camera:
+<syntaxhighlight lang=Python>
+import cv2
+CAMERA_INDEX = 0
+TOTAL_NUM_FRAMES = 100
+FRAMERATE = 30.0
+def is_camera_available(camera_index=0):
+    cap = cv2.VideoCapture(camera_index)
+    if not cap.isOpened():
+        return False
+    cap.release()
+    return True
+def main():
+    if is_camera_available(CAMERA_INDEX):
+        print(f"Camera {CAMERA_INDEX} is available.")
+    else:
+        print(f"Camera {CAMERA_INDEX} is not available.")
+        exit()
+    cap = cv2.VideoCapture(CAMERA_INDEX)
+    if not cap.isOpened():
+        print("Error: Could not open video stream.")
+        exit()
+    print("Camera opened successfully.")
+    frame_width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
+    frame_height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
+    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
+    out = cv2.VideoWriter('output.mp4', fourcc, FRAMERATE, (frame_width, frame_height))
+    num_frames = 0
+    while True:
+        ret, frame = cap.read()
+        if not ret:
+            print("Error: Failed to capture image.")
+            break
+        out.write(frame)
+        print(f"Recording: {num_frames} / {TOTAL_NUM_FRAMES}", end='\r')
+        if num_frames >= TOTAL_NUM_FRAMES:
+            print("\nCapture duration reached, stopping recording.")
+            break
+        num_frames += 1
+    # Release the camera and the VideoWriter
+    cap.release()
+    out.release()
+if __name__ == '__main__':
+    main()
+</syntaxhighlight>
+=== MIPI CSI camera ===
+The following Python code shows a basic example using <code>OpenCV</code> to capture from a MIPI CSI camera:
+<syntaxhighlight lang=Python>
+import cv2
+TOTAL_NUM_FRAMES = 100
+FRAMERATE = 30.0
+PIPELINE = "qtiqmmfsrc ! 'video/x-raw(memory:GBM),width=(int)1920,height=(int)1080,format=(string)NV12,framerate=(fraction)30/1' ! autovideoconvert ! 'video/x-raw,format=(string)BGRx' ! appsink"
+def is_camera_available():
+    cap = cv2.VideoCapture(PIPELINE)
+    if not cap.isOpened():
+        return False
+    cap.release()
+    return True
+def main():
+    if is_camera_available():
+        print("A camera is available.")
+    else:
+        print("No camera available.")
+        exit()
+    cap = cv2.VideoCapture(PIPELINE)
+    if not cap.isOpened():
+        print("Error: Could not open video stream.")
+        exit()
+    print("Camera opened successfully.")
+    frame_width = int(cap.get(cv2.CAP_PROP_FRAME_WIDTH))
+    frame_height = int(cap.get(cv2.CAP_PROP_FRAME_HEIGHT))
+    fourcc = cv2.VideoWriter_fourcc(*'mp4v')
+    out = cv2.VideoWriter('output.mp4', fourcc, FRAMERATE, (frame_width, frame_height))
+    num_frames = 0
+    while True:
+        ret, frame = cap.read()
+        if not ret:
+            print("Error: Failed to capture image.")
+            break
+        out.write(frame)
+        print(f"Recording: {num_frames} / {TOTAL_NUM_FRAMES}", end='\r')
+        if num_frames >= TOTAL_NUM_FRAMES:
+            print("\nCapture duration reached, stopping recording.")
+            break
+        num_frames += 1
+    # Release the camera and the VideoWriter
+    cap.release()
+    out.release()
+if __name__ == '__main__':
+    main()
+</syntaxhighlight>
 == GStreamer Examples ==