3.4.3. Python代码解析

3.4.3.1. Case 0: 使用 opencv 做解码和数据预处理

如下，我们使用了一个 while 循环来模拟真实的目标检测业务：

# ...
# using opencv cap get video frame
while cap.isOpened():

  # ...
  # get one frame
  ret, img = cap.read()

  # ...
  # preforward
  data = preprocess(img, detected_size)

  # ...
  # set input data from host memory
  input_data = {input_name: np.array([data], dtype=np.float32)}

  # ...
  # forward
  output = net.process(graph_name, input_data)

  # ...
  # postforward include NMS
  bboxes, classes, probs = postprocess(output, img, detected_size, threshold)

  # ...