yolov7目标检测web
时间: 2025-04-21 22:39:59 浏览: 19
### 实现YOLOv7目标检测的Web应用
为了实现在Web环境中集成YOLOv7进行目标检测的功能,可以采用多种技术栈组合来达成这一目的。一种常见的做法是使用Flask作为后端框架,负责接收来自用户的请求并调用YOLOv7模型执行预测操作;对于前端部分,则可以选择React、Vue.js或其他轻量级JavaScript库/框架以便于用户交互。
#### 后端设置 (Flask)
首先,在服务器侧安装必要的依赖项:
```bash
pip install flask torch torchvision opencv-python-headless yolov7
```
接着定义一个基本的Flask应用程序结构如下所示:
```python
from flask import Flask, request, jsonify
import cv2
import numpy as np
import torch
from PIL import Image
from io import BytesIO
app = Flask(__name__)
# 加载预训练好的YOLOv7权重文件
model = torch.hub.load('WongKinYiu/yolov7', 'custom', path='path/to/best.pt')
@app.route('/detect', methods=['POST'])
def detect():
if 'image' not in request.files:
return jsonify({'error': 'No image provided'}), 400
file = request.files['image']
img_bytes = file.read()
img = Image.open(BytesIO(img_bytes))
results = model([img])
detections = []
for *box, conf, cls in results.xyxy[0]:
label = f'{results.names[int(cls)]} {conf:.2f}'
bbox = {'label': label,
'confidence': float(conf),
'bbox': [float(x) for x in box]}
detections.append(bbox)
response_data = {
"detections": detections
}
return jsonify(response_data)
if __name__ == '__main__':
app.run(debug=True)
```
这段代码实现了最基本的图片上传接口 `/detect` ,当接收到带有图像的数据时会触发YOLOv7的目标检测流程,并将结果以JSON格式返回给客户端[^4]。
#### 前端实现
假设我们选择了Vue.js作为前端开发工具,那么可以通过HTML表单提交方式向上述API发送请求。这里给出一段简化版的例子展示如何构建这样的页面逻辑:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Object Detection with YOLOv7</title>
<script src="https://cdn.jsdelivr.net/npm/vue@2"></script>
</head>
<body>
<div id="app">
<h1>Select an image to upload:</h1>
<!-- 文件输入框 -->
<input type="file" @change="onFileChange">
<!-- 显示已选中的文件名 -->
<p v-if="selectedImage">Selected File: {{ selectedImage.name }}</p>
<!-- 提交按钮 -->
<button @click="uploadImage()">Upload and Detect!</button>
<!-- 结果区域 -->
<div v-for="(result, index) in detectionResults" :key="index">
Label: {{ result.label }} Confidence:{{ result.confidence }}
Bounding Box:[{{ result.bbox.join(', ') }}]
</div>
</div>
<script>
new Vue({
el: '#app',
data() {
return {
selectedImage: null,
detectionResults: [],
};
},
methods: {
onFileChange(e){
this.selectedImage = e.target.files[0];
},
async uploadImage(){
const formData = new FormData();
formData.append('image', this.selectedImage);
try{
let res = await fetch('/detect',{
method:'POST',
body:formData
});
let jsonRes = await res.json();
console.log(jsonRes);
this.detectionResults = jsonRes.detections;
}catch(err){
alert(`Error occurred during processing ${err.message}`);
}
}
}
});
</script>
</body>
</html>
```
此段代码展示了怎样创建一个简单的网页让用户能够选择本地图片并通过AJAX异步请求的方式传递到后台的服务中去处理,最后再把得到的结果呈现在界面上供查看[^5]。
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