生成检验文件是否存在的python代码
时间: 2023-12-11 19:05:43 浏览: 12
你可以使用Python的os模块来检验文件是否存在。以下是示例代码:
```python
import os
filename = "example.txt"
if os.path.isfile(filename):
print("File exists")
else:
print("File does not exist")
```
在上面的示例中,我们首先定义要检查的文件名。然后,我们使用`os.path.isfile()`函数来检查文件是否存在。如果文件存在,则打印“File exists”,否则打印“File does not exist”。
相关问题
生成一个python的视频目标检测代码
好的,以下是一个使用 TensorFlow Object Detection API 进行目标检测的 Python 代码:
```python
import os
import cv2
import numpy as np
import tensorflow.compat.v1 as tf
tf.disable_v2_behavior()
# 加载模型
MODEL_NAME = 'ssd_inception_v2_coco_2018_01_28'
PATH_TO_CKPT = MODEL_NAME + '/frozen_inference_graph.pb'
PATH_TO_LABELS = os.path.join('data', 'mscoco_label_map.pbtxt')
NUM_CLASSES = 90
detection_graph = tf.Graph()
with detection_graph.as_default():
od_graph_def = tf.GraphDef()
with tf.gfile.GFile(PATH_TO_CKPT, 'rb') as fid:
serialized_graph = fid.read()
od_graph_def.ParseFromString(serialized_graph)
tf.import_graph_def(od_graph_def, name='')
# 加载标签
label_map = {}
with open(PATH_TO_LABELS, 'r') as f:
for line in f.readlines():
if 'id:' in line:
idx = int(line.split(':')[1])
elif 'name:' in line:
name = line.split(':')[1].strip()
label_map[idx] = name
# 执行目标检测
with detection_graph.as_default():
with tf.Session(graph=detection_graph) as sess:
cap = cv2.VideoCapture('input.mp4') # 输入视频文件
writer = None
while True:
ret, image_np = cap.read()
if not ret:
break
# 执行目标检测
image_np_expanded = np.expand_dims(image_np, axis=0)
image_tensor = detection_graph.get_tensor_by_name('image_tensor:0')
boxes = detection_graph.get_tensor_by_name('detection_boxes:0')
scores = detection_graph.get_tensor_by_name('detection_scores:0')
classes = detection_graph.get_tensor_by_name('detection_classes:0')
num_detections = detection_graph.get_tensor_by_name('num_detections:0')
(boxes, scores, classes, num_detections) = sess.run(
[boxes, scores, classes, num_detections],
feed_dict={image_tensor: image_np_expanded})
# 绘制检测框
boxes = np.squeeze(boxes)
scores = np.squeeze(scores)
classes = np.squeeze(classes).astype(np.int32)
for i in range(num_detections):
if scores[i] > 0.5:
ymin, xmin, ymax, xmax = tuple(boxes[i])
im_height, im_width, _ = image_np.shape
(left, right, top, bottom) = (xmin * im_width, xmax * im_width,
ymin * im_height, ymax * im_height)
cv2.rectangle(image_np, (int(left), int(top)), (int(right), int(bottom)), (0, 255, 0), 2)
cv2.putText(image_np, label_map[classes[i]], (int(left), int(top)-5), cv2.FONT_HERSHEY_SIMPLEX, 0.5, (0, 255, 0), 2)
# 写入输出视频文件
if writer is None:
fourcc = cv2.VideoWriter_fourcc(*"MJPG")
writer = cv2.VideoWriter("output.avi", fourcc, 30, (image_np.shape[1], image_np.shape[0]), True)
writer.write(image_np)
cap.release()
writer.release()
```
注意,此代码需要使用 TensorFlow 1.x 版本和 Object Detection API。此外,需要提前下载 SSD Inception V2 COCO 模型和 MSCOCO 标签文件。在运行代码之前,需要将输入视频文件路径和输出视频文件路径替换为实际的路径。
生成python代码,实现识别图像并对图像文件分类存放
好的,我可以帮你生成一个基于Python的脚本,使用OpenCV库实现图像分类的功能。请确保你已经安装了OpenCV库和其他必要的库。
```python
import cv2
import os
# 定义分类器
classifier = cv2.CascadeClassifier("haarcascade_frontalface_default.xml")
# 定义图像文件夹路径和分类后的文件夹路径
image_folder = "image_folder"
classified_folder = "classified_folder"
# 如果分类后的文件夹不存在,则创建一个
if not os.path.exists(classified_folder):
os.makedirs(classified_folder)
# 遍历图像文件夹中的所有文件
for filename in os.listdir(image_folder):
# 如果文件不是图像文件,则跳过
if not (filename.endswith(".jpg") or filename.endswith(".png")):
continue
# 加载图像文件
image = cv2.imread(os.path.join(image_folder, filename))
# 转换为灰度图像
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
# 使用分类器检测图像中的物体
objects = classifier.detectMultiScale(gray, scaleFactor=1.3, minNeighbors=5)
# 如果图像中没有检测到物体,则跳过
if len(objects) == 0:
continue
# 获取图像中第一个物体的位置和大小
x, y, w, h = objects[0]
# 如果物体是人脸,则将图像文件移动到人脸文件夹中
if w > 100 and h > 100:
os.rename(os.path.join(image_folder, filename), os.path.join(classified_folder, filename))
```
这个脚本会遍历指定的图像文件夹中的所有图像文件,使用人脸识别分类器检测图像中的物体,如果检测到人脸,则将图像文件移动到分类后的文件夹中。你可以根据需要更改分类器的参数和分类的条件。