initial add of camera_stream object to all examples - without T-API enabled

Author: tobybreckon

abs_difference.py

@@ -61,8 +61,20 @@ def nothing(x):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

bilateral_filter.py

@@ -59,8 +59,20 @@ def nothing(x):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

butterworth_high_pass_filter.py

@@ -102,8 +102,20 @@ def reset_butterworth_filter(_):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

butterworth_low_pass_filter.py

@@ -102,8 +102,20 @@ def reset_butterworth_filter(_):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

capture_camera.py

@@ -41,7 +41,17 @@
 
 # define video capture object
 
-cap = cv2.VideoCapture()
+try:
+    # to use a non-buffered camera stream (via a separate thread)
+
+    import camera_stream
+    cap = camera_stream.CameraVideoStream(use_tapi=False)
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

capture_video.py

@@ -47,7 +47,17 @@
 
 # define video capture object
 
-cap = cv2.VideoCapture()
+try:
+    # to use a non-buffered camera stream (via a separate thread)
+
+    import camera_stream
+    cap = camera_stream.CameraVideoStream(use_tapi=False)
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

clahe_equalization.py

@@ -79,8 +79,20 @@ def nothing(x):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

colour_object_tracking.py

@@ -99,8 +99,20 @@ def nothing(x):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

contrast_stretching.py

@@ -70,8 +70,20 @@ def hist_lines(hist):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name
 

correlation_template_matching.py

@@ -89,8 +89,20 @@ def on_mouse(event, x, y, flags, params):
 
 # define video capture object
 
+try:
+    # to use a non-buffered camera stream (via a separate thread)
 
-cap = cv2.VideoCapture()
+    if not(args.video_file):
+        import camera_stream
+        cap = camera_stream.CameraVideoStream(use_tapi=False)
+    else:
+        cap = cv2.VideoCapture()  # not needed for video files
+
+except BaseException:
+    # if not then just use OpenCV default
+
+    print("INFO: camera_stream class not found - camera input may be buffered")
+    cap = cv2.VideoCapture()
 
 # define display window name