im about to build video analytic using python. im able to detect object in video using tensorflow. But i cannot get the time when the object appear in video. i have scenario like this :
i have 16 seconds video .
in the 5th second, the object appears on the video.
in the 7th second, the object disappear on the video.
so it will print "Time Calculation “00:00:02”
I tried to use VideoCapture’s method get() using property identifier like this:
video_capture.get(CV_CAP_PROP_POS_MSEC)
Here is the code for tracking the object
cap = cv2.VideoCapture("video")
while cap.isOpened():
ret, frame = cap.read()
image_np = np.array(frame)
input_tensor = tf.convert_to_tensor(np.expand_dims(image_np, 0), dtype=tf.float32)
detections = detect_fn(input_tensor)
num_detections = int(detections.pop('num_detections'))
detections = {key: value[0, :num_detections].numpy()
for key, value in detections.items()}
detections['num_detections'] = num_detections
# detection_classes should be ints.
detections['detection_classes'] =
detections['detection_classes'].astype(np.int64)
label_id_offset = 1
image_np_with_detections = image_np.copy()
viz_utils.visualize_boxes_and_labels_on_image_array(
image_np_with_detections,
detections['detection_boxes'],
detections['detection_classes']+label_id_offset,
detections['detection_scores'],
category_index,
use_normalized_coordinates=True,
max_boxes_to_draw=5,
min_score_thresh=.8,
agnostic_mode=False
)
cv2.imshow('object detection', cv2.resize(image_np_with_detections, (800, 600)))
if cv2.waitKey(10) & 0xFF == ord('q'):
cap.release()
cv2.destroyAllWindows()
break