当前位置:首页>python>基于Python深度学习的车辆车牌识别系统(PyTorch2卷积神经网络CNN+OpenCV4实现)- 车辆识别字符模型定义与训练

基于Python深度学习的车辆车牌识别系统(PyTorch2卷积神经网络CNN+OpenCV4实现)- 车辆识别字符模型定义与训练

  • 2026-01-30 20:08:37
基于Python深度学习的车辆车牌识别系统(PyTorch2卷积神经网络CNN+OpenCV4实现)- 车辆识别字符模型定义与训练

大家好,我是python222_锋哥,最近更新基于Python深度学习的车辆车牌识别系统(PyTorch2卷积神经网络CNN+OpenCV4实现)视频教程系列课程,感谢大家支持。

B站连载更新地址:

https://www.bilibili.com/video/BV1BdUnBLE6N/

本课程采用主流的Python技术栈实现,分两套系统讲解,一套是专门讲PyTorch2卷积神经网络CNN训练模型,识别车牌,当然实现过程中还用到OpenCV实现图像格式转换,裁剪,大小缩放等。另外一套是基于前面Django+Vue通用权限系统基础上(https://www.bilibili.com/video/BV19spseGE9Y/),加了车辆识别业务模型,Mysql8数据库,Django后端,Vue前端,后端集成训练好的模型,实现车牌识别。
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1,卷积神经网络定义

首先新建一个纯净版项目lprs_model,选虚拟环境,python版本3.11

把images目录放到项目里,cnn_char_train是训练集字符图片,cnn_char_test是测试集字符图片。test下面是项目最终测试牌照图片。

字符都是20*20像素的图像。

项目里贴下 requirements.txt 依赖文本:安装pytorch,opencv等核心库。

colorama==0.4.6filelock==3.20.0fsspec==2025.10.0Jinja2==3.1.6MarkupSafe==3.0.3mpmath==1.3.0networkx==3.5numpy==2.2.6opencv-python==4.12.0.88pillow==12.0.0sympy==1.14.0torch==2.9.0torchvision==0.24.0tqdm==4.67.1typing_extensions==4.15.0

运行安装命令:

pip install -r requirements.txt -i http://mirrors.aliyun.com/pypi/simple/   --trusted-host mirrors.aliyun.com

新建char_model.py,定义模型

fromtorchimportnn# 说明:训练图片像素是20# 目前中国大陆车牌字符 31个汉字 26个字母 10个数字 一个67种numbers = ['0''1''2''3''4''5''6''7''8''9']alphbets = ['A''B''C''D''E''F''G''H''I''J''K''L''M''N''O''P''Q''R''S''T','U''V''W''X''Y''Z']chinese = ['zh_cuan''zh_e''zh_gan''zh_gan1''zh_gui''zh_gui1''zh_hei''zh_hu''zh_ji''zh_jin','zh_jing''zh_jl''zh_liao''zh_lu''zh_meng''zh_min''zh_ning''zh_qing''zh_qiong','zh_shan''zh_su''zh_sx''zh_wan''zh_xiang''zh_xin''zh_yu''zh_yu1''zh_yue''zh_yun','zh_zang''zh_zhe']# 定义卷积神经网络模型cnn_model = nn.Sequential(# 第一层卷积层,输入1通道,输出32通道,卷积核大小3x3,填充1,nn.Conv2d(132kernel_size=3padding=1),nn.ReLU(),nn.MaxPool2d(22),  # 卷积层后接池化层 池化核大小2x2,步长2# 第二层卷积层,输入32通道,输出64通道,卷积核大小3x3,填充1,nn.Conv2d(3264kernel_size=3padding=1),nn.ReLU(),nn.MaxPool2d(22),  # 卷积层后接池化层 池化核大小2x2,步长2# 展平操作,将数据从二维转为一维nn.Flatten(),# 第一个全连接层,输入64 * 5 * 5通道,输出512通道  像素20*20 经过2次卷积,得到64 * 5 * 5nn.Linear(64*5*5512),nn.ReLU(),# 第二全连接层,输入512通道,输出256通道nn.Linear(512256),nn.ReLU(),# 第三全连接层,输入256通道,输出67通道nn.Linear(25667))

2,自定义字符图片数据集

之前学习Pytorch2的时候,我们用得数据集都是库自带的。但是我们这边的数据集需要自定义。

可以继承data.Dataset,实现 __init__初始化方法,__len__返回长度方法,__getitem__根据索引获取元素方法。因为数据集内容是图片,所以定义X属性,作为训练数据,定义y属性,作为目标数据

# 字符图片数据集classCharPicDataset(data.Dataset):# 根据路径获取所有文件deflist_all_files(selfroot):files = []list = os.listdir(root)  # 获取根目录下的所有文件名foriinrange(len(list)):element = os.path.join(rootlist[i])  # 获取文件路径ifos.path.isfile(element):  # 判断是否是文件files.append(element)elifos.path.isdir(element):  # 递归判断子目录files.extend(self.list_all_files(element))returnfilesdef__init__(selfdata_dir):super().__init__()ifnotos.path.exists(data_dir):raiseException("数据目录不存在")files = self.list_all_files(data_dir)self.X = []self.y = []self.dataset = numbers+alphbets+chineseforfileinfiles:src_img = cv2.imread(filecv2.IMREAD_GRAYSCALE)  # 读取灰度图resize_img = cv2.resize(src_img, (2020))  # 改变图片大小self.X.append(resize_img)dir = os.path.dirname(file)  # 获取文件的目录  结果类似  ./images/cnn_char_train\Adir_name = os.path.split(dir)[-1]  # 获取目录名  结果类似 0 或者 1 或者 A 或者 苏index_y = self.dataset.index(dir_name)  # 获取标签索引self.y.append([index_y])self.X = np.array(self.X)self.y = np.array(self.y)def__len__(self):returnlen(self.X)def__getitem__(selfindex):"""        这段代码的作用是:        - 创建一个 `transforms.ToTensor()` 转换对象,用于将 PIL 图像或 numpy 数组转换为 PyTorch 张量(tensor)        - 该转换会自动将像素值从 [0, 255] 范围缩放到 [0, 1] 范围 归一化处理        - 同时会将图像的通道顺序从 HWC (Height-Width-Channel) 调整为 CHW (Channel-Height-Width),这是 PyTorch 所要求的格式        这个转换通常用于深度学习训练中,将图像数据预处理成适合神经网络输入的格式。        """tf = transforms.ToTensor()returntf(self.X[index]), torch.LongTensor(self.y[index])

图片我们要处理下,先用opencv转成灰度图,0到255大小。20*20的二维数组。

定义main方法:

if__name__ == '__main__':train_data_dir = './images/cnn_char_train'traindataset = CharPicDataset(train_data_dir)print(traindataset.X)print(traindataset.y)

运行输出:

D:\python_pro\lpr2\lprs_model\venv\Scripts\python.exe D:\python_pro\lpr2\lprs_model\char_model.py [[[1 0 1 ... 0 0 0]  [0 1 1 ... 0 0 0]  [0 2 0 ... 0 0 0]  ...  [0 0 2 ... 0 0 0]  [1 0 0 ... 0 0 0]  [0 0 4 ... 0 0 0]] [[0 1 0 ... 0 0 0]  [0 1 1 ... 0 0 0]  [1 0 1 ... 0 0 0]  ...  [1 0 2 ... 0 0 0]  [0 0 0 ... 0 0 0]  [0 4 1 ... 0 0 0]] [[0 3 0 ... 0 0 0]  [2 0 1 ... 0 0 0]  [1 0 0 ... 0 0 0]  ...  [0 0 2 ... 0 0 0]  [1 0 0 ... 0 0 0]  [0 5 1 ... 0 0 0]] ... [[0 2 0 ... 0 0 2]  [0 0 0 ... 1 1 0]  [0 2 2 ... 0 1 0]  ...  [0 3 0 ... 0 0 0]  [1 0 0 ... 0 0 0]  [2 0 0 ... 0 0 0]] [[0 1 3 ... 0 0 0]  [2 0 0 ... 0 0 0]  [0 5 1 ... 0 0 0]  ...  [1 0 0 ... 0 0 0]  [0 1 1 ... 0 0 0]  [1 0 0 ... 0 0 0]] [[0 0 2 ... 0 0 0]  [2 0 0 ... 0 0 0]  [0 2 2 ... 0 0 0]  ...  [4 0 1 ... 0 0 0]  [0 0 1 ... 0 0 0]  [0 3 0 ... 0 0 0]]][[ 0] [ 0] [ 0] ... [66] [66] [66]]Process finished with exit code 0

3,训练模型

前面我们定义好了神经网络和自定义好了数据集,然后我们来训练模型:

# 定义损失函数criterion = nn.CrossEntropyLoss()  # 交叉熵损失函数optimizer = torch.optim.Adam(cnn_model.parameters(), lr=0.001)  # 优化器deftrain(epochs):cnn_model.train()  # 训练模式forepochinrange(epochs):loss = 0forimagetargetintrain_loader:target = Variable(target).reshape(1, )# 前向传播output = cnn_model(image)loss = criterion(outputtarget)  # 计算损失# 反向传播和优化optimizer.zero_grad()  # 清空梯度loss.backward()  # 反向传播optimizer.step()  # 更新参数print(f'Epoch [{epoch + 1}/{epochs}],  Loss: {loss.item():.4f}')if__name__ == '__main__':train_data_dir = './images/cnn_char_train'train_model_path = 'char.pth'print('开始训练模型...')traindataset = CharPicDataset(train_data_dir)train_loader = data.DataLoader(traindatasetbatch_size=1shuffle=True)epochs = 3train(epochs)torch.save(cnn_modeltrain_model_path)  # 保存模型

运行输出:

开始训练模型...Epoch [1/3],  Loss: 0.0028Epoch [2/3],  Loss: 0.0000Epoch [3/3],  Loss: 0.0000

生成了char.pth模型文件

4,测试集验证模型

我们可以对之前训练的模型用测试数据进行测试,看看准确率如何。

deftest():cnn_model.eval()  # 测试模式correct = 0total = 0withtorch.no_grad():  # 不计算梯度forimagetargetintest_loader:target = Variable(target).reshape(1, )  # 转换为1维向量output = cnn_model(image)  # 预测_predicted = torch.max(output.data1)  # 获取预测结果total += target.size(0)correct += (predicted == target).sum().item()print('测试集总样本数:'total)print('测试集正确数:'correct)print(f'Accuracy: {100 * correct / total:.2f}%')if__name__ == '__main__':train_data_dir = './images/cnn_char_train'test_data_dir = './images/cnn_char_test'train_model_path = 'char.pth'print('开始训练模型...')traindataset = CharPicDataset(train_data_dir)testdataset = CharPicDataset(test_data_dir)train_loader = data.DataLoader(traindatasetbatch_size=1shuffle=True)test_loader = data.DataLoader(testdatasetbatch_size=1shuffle=True)epochs = 3train(epochs)torch.save(cnn_modeltrain_model_path)  # 保存模型test()print('模型训练完毕')

运行输出:

开始训练模型...Epoch [1/3],  Loss: 0.0000Epoch [2/3],  Loss: 3.4180Epoch [3/3],  Loss: 0.0877测试集总样本数: 1784测试集正确数: 1740Accuracy: 97.53%模型训练完毕
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  1. CONNECT:[ UseTime:0.000573s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000766s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000421s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000392s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.007987s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000686s ]
  8. SELECT * FROM `article` WHERE `id` = 464866 LIMIT 1 [ RunTime:0.010436s ]
  9. UPDATE `article` SET `lasttime` = 1770513761 WHERE `id` = 464866 [ RunTime:0.008303s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000319s ]
  11. SELECT * FROM `article` WHERE `id` < 464866 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.007121s ]
  12. SELECT * FROM `article` WHERE `id` > 464866 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000534s ]
  13. SELECT * FROM `article` WHERE `id` < 464866 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004784s ]
  14. SELECT * FROM `article` WHERE `id` < 464866 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011268s ]
  15. SELECT * FROM `article` WHERE `id` < 464866 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001075s ]
0.130126s