在Python中使用object_detection.utils.visualization_utils库的目标检测结果可视化功能
发布时间:2023-12-27 17:24:41
object_detection.utils.visualization_utils是tensorlfow/models/research/object_detection/utils/visualization_utils.py中的一个库,它提供了一些函数用于在目标检测结果中进行可视化。例如,它可以绘制边界框、标签和分数,以及在图像中绘制检测到的对象。下面是一个使用object_detection.utils.visualization_utils库的目标检测结果可视化的例子:
首先,我们需要导入必要的库:
import numpy as np import tensorflow as tf from PIL import Image from object_detection.utils import visualization_utils as vis_util
然后,我们可以加载训练模型和相关标签的标签映射:
model_path = 'path/to/your/frozen/model.pb'
label_map_path = 'path/to/your/label_map.pbtxt'
detection_graph = tf.Graph()
with detection_graph.as_default():
od_graph_def = tf.GraphDef()
with tf.gfile.GFile(model_path, 'rb') as fid:
serialized_graph = fid.read()
od_graph_def.ParseFromString(serialized_graph)
tf.import_graph_def(od_graph_def, name='')
label_map = {}
with open(label_map_path, 'r') as f:
for line in f:
if 'name' in line:
label_id = int(next(f).split(':')[1].strip())
label_name = next(f).split(':')[1].strip().replace("'", '')
label_map[label_id] = label_name
接下来,我们将加载一张测试图像,并将其输入模型中进行预测:
image_path = 'path/to/your/test/image.jpg'
image = Image.open(image_path)
image_np = np.array(image)
with detection_graph.as_default():
with tf.Session(graph=detection_graph) as sess:
image_tensor = detection_graph.get_tensor_by_name('image_tensor:0')
detection_boxes = detection_graph.get_tensor_by_name('detection_boxes:0')
detection_scores = detection_graph.get_tensor_by_name('detection_scores:0')
detection_classes = detection_graph.get_tensor_by_name('detection_classes:0')
num_detections = detection_graph.get_tensor_by_name('num_detections:0')
image_np_expanded = np.expand_dims(image_np, axis=0)
(boxes, scores, classes, num) = sess.run(
[detection_boxes, detection_scores, detection_classes, num_detections],
feed_dict={image_tensor: image_np_expanded})
最后,我们可以使用object_detection.utils.visualization_utils库中的函数在测试图像上绘制检测结果:
vis_util.visualize_boxes_and_labels_on_image_array(
image_np,
np.squeeze(boxes),
np.squeeze(classes).astype(np.int32),
np.squeeze(scores),
label_map,
use_normalized_coordinates=True,
line_thickness=8)
output_image = Image.fromarray(image_np)
output_image.save('path/to/output/image.jpg')
以上代码将从模型中获取检测到的边界框、分数和类别,并使用可视化工具将它们绘制在测试图像上。最后,保存输出图像并在指定的输出路径下找到它。
这只是一个简单的示例,你可以根据自己的需求进行修改和扩展。希望这可以帮助你开始使用object_detection.utils.visualization_utils库的目标检测结果可视化功能。
