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vue实现人脸比对

2026-01-15 01:55:32VUE

实现人脸比对的基本流程

在Vue中实现人脸比对功能，主要涉及前端图像采集、人脸检测、特征提取以及相似度计算等步骤。以下是具体实现方法：

安装必要依赖库

需要使用到的人脸识别库如face-api.js或tracking.js：

npm install face-api.js

初始化人脸识别模型

加载预训练模型（如TinyFaceDetector或SSD Mobilenet V1）：

import * as faceapi from 'face-api.js';

async loadModels() {
  await faceapi.nets.tinyFaceDetector.loadFromUri('/models');
  await faceapi.nets.faceLandmark68Net.loadFromUri('/models');
  await faceapi.nets.faceRecognitionNet.loadFromUri('/models');
}

图像采集与处理

通过HTML5的<video>和<canvas>元素捕获图像：

<video ref="video" autoplay muted></video>
<canvas ref="canvas" width="600" height="450"></canvas>

人脸检测与特征提取

检测人脸并提取特征描述符：

async detectFaces(imageElement) {
  const detections = await faceapi.detectAllFaces(imageElement)
    .withFaceLandmarks()
    .withFaceDescriptors();
  return detections;
}

人脸特征比对

计算两个人脸描述符之间的欧氏距离：

function compareFaces(descriptor1, descriptor2) {
  return faceapi.euclideanDistance(descriptor1, descriptor2);
}

阈值判断

设定相似度阈值（通常0.6以下认为是同一个人）：

const threshold = 0.6;
const isSamePerson = distance < threshold;

完整示例代码

<template>
  <div>
    <video ref="video" autoplay muted></video>
    <canvas ref="canvas" width="600" height="450"></canvas>
    <button @click="captureFace">Capture Face</button>
    <button @click="compareFaces">Compare</button>
  </div>
</template>

<script>
import * as faceapi from 'face-api.js';

export default {
  data() {
    return {
      faceDescriptors: [],
      videoStream: null
    };
  },
  async mounted() {
    await this.loadModels();
    this.startCamera();
  },
  methods: {
    async loadModels() {
      await faceapi.nets.tinyFaceDetector.loadFromUri('/models');
      await faceapi.nets.faceLandmark68Net.loadFromUri('/models');
      await faceapi.nets.faceRecognitionNet.loadFromUri('/models');
    },
    startCamera() {
      navigator.mediaDevices.getUserMedia({ video: true })
        .then(stream => {
          this.$refs.video.srcObject = stream;
          this.videoStream = stream;
        });
    },
    async captureFace() {
      const canvas = this.$refs.canvas;
      const video = this.$refs.video;
      canvas.getContext('2d').drawImage(video, 0, 0, canvas.width, canvas.height);

      const detections = await faceapi.detectAllFaces(canvas)
        .withFaceLandmarks()
        .withFaceDescriptors();

      if (detections.length > 0) {
        this.faceDescriptors.push(detections[0].descriptor);
      }
    },
    async compareFaces() {
      if (this.faceDescriptors.length < 2) return;

      const distance = faceapi.euclideanDistance(
        this.faceDescriptors[0],
        this.faceDescriptors[1]
      );

      alert(`Distance: ${distance}\nSame person: ${distance < 0.6}`);
    }
  },
  beforeDestroy() {
    if (this.videoStream) {
      this.videoStream.getTracks().forEach(track => track.stop());
    }
  }
};
</script>