Tensorflow对象检测：如何批量检测

Question

我正在尝试使用tensorflow detection tutorial对批处理执行检测，但以下代码给出了setting an array element with a sequence.错误。

# load multiple images 
np_images = []
for img_path in img_paths:
    img = Image.open(image_path)
    image_np = load_image_into_numpy_array(img)      
    image_np_expanded = np.expand_dims(image_np, axis=0)
    np_images.append(image_np)

#Get input and output tensors
image_tensor = det_graph.get_tensor_by_name('image_tensor:0')  
boxes = det_graph.get_tensor_by_name('detection_boxes:0')     
scores = det_graph.get_tensor_by_name('detection_scores:0')
classes = det_graph.get_tensor_by_name('detection_classes:0')
num_detections = det_graph.get_tensor_by_name('num_detections:0')

# detect on batch of images
detection_results = sess.run(
        [boxes, scores, classes, num_detections],
        feed_dict={image_tensor: np_images})  

如何正确输入图像数组？

Answer 1

feed_dict中的image_tensor应具有维度[batch_size，x，y，3]，其中（x，y）是每个图像的大小。如果您的图像大小都不同，则无法创建这样的numpy数组。您可以调整图像大小以解决此问题。

# If the NN was trained on (300,300) size images
IMAGE_SIZE = (300, 300)
for img_path in img_paths:
    img = Image.open(image_path).resize(IMAGE_SIZE)
    image_np = load_image_into_numpy_array(img)      
    np_images.append(image_np)
...
detection_results = sess.run(
    [boxes, scores, classes, num_detections],
    feed_dict={image_tensor: np.array(np_images)})