img_name.append(os.path.join(img_root,name[:-4]+'.png'))中name[:-4]是什么意思
时间: 2024-06-02 18:13:21 浏览: 115
这是 Python 代码中的一行,其中 name[:-4] 是将字符串 name 的最后四个字符去掉后的结果。这段代码的作用是将图片的路径和文件名拼接成完整的图片路径。具体来说,如果 name 变量是一个类似于 "image001.jpg" 的字符串,那么 name[:-4] 就会返回 "image001",然后再和 ".png" 拼接在一起,就得到了完整的图片路径。
相关问题
#!/usr/bin/env python2.7 # coding=UTF-8 import os import sys import cv2 from pyzbar import pyzbar def main(image_folder_path, output_file_name): img_files = [f for f in os.listdir(image_folder_path) if f.endswith(('.png'))] qr_codes_found = [] print("Image files:") for img_file in img_files: print(img_file) for img_file in img_files: img_path = os.path.join(image_folder_path,img_file) img = cv2.imread(img_path) barcodes = pyzbar.decode(img) for barcode in barcodes: if barcode.type == 'QRCODE': qr_data = barcode.data.decode("utf-8") qr_codes_found.append((img_file, qr_data)) with open(output_file_name,'w') as f: for file_name,qr_content in qr_codes_found: file_name = os.path.splitext(file_name)[0] # 去掉文件名的扩展名 f.write("{}: {}\n".format(file_name, qr_content)) if __name__ == "__main__": image_folder_path = '/root/Pictures' output_file_name = 'qr_codes_found.txt' main(image_folder_path,output_file_name)如果识别到相同代码,如何让最后获得的文本中没有相同的解码内容
如果要确保最后获得的文本中没有相同的解码内容,您可以在保存解码结果之前进行一些处理。以下是一种方法:
1. 在`qr_codes_found`列表中保存所有解码结果。
2. 创建一个新的列表`unique_qr_codes`来保存唯一的解码内容。
3. 遍历`qr_codes_found`列表,将每个解码内容添加到`unique_qr_codes`列表中,但仅当该解码内容不在`unique_qr_codes`列表中时才添加。
4. 将`unique_qr_codes`列表中的内容保存到文件中。
下面是修改后的代码示例:
```python
def main(image_folder_path, output_file_name):
img_files = [f for f in os.listdir(image_folder_path) if f.endswith(('.png'))]
qr_codes_found = []
print("Image files:")
for img_file in img_files:
print(img_file)
for img_file in img_files:
img_path = os.path.join(image_folder_path,img_file)
img = cv2.imread(img_path)
barcodes = pyzbar.decode(img)
for barcode in barcodes:
if barcode.type == 'QRCODE':
qr_data = barcode.data.decode("utf-8")
qr_codes_found.append((img_file, qr_data))
unique_qr_codes = []
for file_name, qr_content in qr_codes_found:
if qr_content not in unique_qr_codes:
unique_qr_codes.append(qr_content)
with open(output_file_name,'w') as f:
for qr_content in unique_qr_codes:
f.write("{}\n".format(qr_content))
if __name__ == "__main__":
image_folder_path = '/root/Pictures'
output_file_name = 'qr_codes_found.txt'
main(image_folder_path,output_file_name)
```
这样,最后生成的文本文件中将只包含唯一的解码内容,不会有重复的内容出现。
#!/usr/bin/env python2.7 # -*- coding: UTF-8 -*- import rospy from sensor_msgs.msg import Image from cv_bridge import CvBridge import cv2 import os from pyzbar import pyzbar def image_callback(msg): # 将ROS图像消息转换为OpenCV图像 bridge = CvBridge() frame = bridge.imgmsg_to_cv2(msg, desired_encoding='bgr8') # 执行生成文本的逻辑 image_folder_path = '/root/Pictures' output_file_name = '/root/Pictures/qr_codes_found.txt' main(image_folder_path, output_file_name) def main(image_folder_path, output_file_name): img_files = [f for f in os.listdir(image_folder_path) if f.endswith('.png')] qr_codes_found = [] print("Image files:") for img_file in img_files: print(img_file) for img_file in img_files: img_path = os.path.join(image_folder_path, img_file) img = cv2.imread(img_path) barcodes = pyzbar.decode(img) for barcode in barcodes: if barcode.type == 'QRCODE': qr_data = barcode.data.decode("utf-8") qr_codes_found.append((img_file, qr_data)) unique_qr_codes = [] for file_name, qr_content in qr_codes_found: if qr_content not in unique_qr_codes: unique_qr_codes.append(qr_content) with open(output_file_name, 'w') as f: for qr_content in unique_qr_codes: f.write("{}\n".format(qr_content)) if __name__ == '__main__': rospy.init_node('text_generation_node') # 创建一个订阅器订阅图像消息 rospy.Subscriber('processed_image', Image, image_callback) rospy.spin() 如何让这个代码生成的文本变为excel文件
要将生成的文本内容保存为 Excel 文件,您可以使用 Python 的 openpyxl 库来实现。下面是修改后的代码,可将生成的文本保存为 Excel 文件:
```python
#!/usr/bin/env python2.7
# -*- coding: UTF-8 -*-
import rospy
from sensor_msgs.msg import Image
from cv_bridge import CvBridge
import cv2
import os
from pyzbar import pyzbar
from openpyxl import Workbook
def image_callback(msg):
# 将ROS图像消息转换为OpenCV图像
bridge = CvBridge()
frame = bridge.imgmsg_to_cv2(msg, desired_encoding='bgr8')
# 执行生成文本的逻辑
image_folder_path = '/root/Pictures'
output_file_name = '/root/Pictures/qr_codes_found.xlsx'
main(image_folder_path, output_file_name)
def main(image_folder_path, output_file_name):
img_files = [f for f in os.listdir(image_folder_path) if f.endswith('.png')]
qr_codes_found = []
print("Image files:")
for img_file in img_files:
print(img_file)
for img_file in img_files:
img_path = os.path.join(image_folder_path, img_file)
img = cv2.imread(img_path)
barcodes = pyzbar.decode(img)
for barcode in barcodes:
if barcode.type == 'QRCODE':
qr_data = barcode.data.decode("utf-8")
qr_codes_found.append((img_file, qr_data))
unique_qr_codes = []
for file_name, qr_content in qr_codes_found:
if qr_content not in unique_qr_codes:
unique_qr_codes.append(qr_content)
# 创建一个新的工作簿
wb = Workbook()
# 获取默认的工作表
sheet = wb.active
# 将数据写入工作表
for i, qr_content in enumerate(unique_qr_codes, start=1):
sheet.cell(row=i, column=1).value = qr_content
# 保存工作簿为Excel文件
wb.save(output_file_name)
if __name__ == '__main__':
rospy.init_node('text_generation_node')
# 创建一个订阅器订阅图像消息
rospy.Subscriber('processed_image', Image, image_callback)
rospy.spin()
```
在上面的代码中,我们使用 openpyxl 库来创建一个新的工作簿,并将数据写入工作表中。最后,我们使用 save() 方法将工作簿保存为 Excel 文件。
请确保已安装 openpyxl 库,可以使用以下命令进行安装:
```
pip install openpyxl
```
请根据您的需求修改文件路径和其他部分。
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