利用PHP与七牛云存储接口实现图片的特征提取和相似度匹配的方法

$ pecl install opencv

<?php
  // 加载OpenCV库
  dl('opencv.so');

  // 读取图片
  $img = cvLoadImage('image.jpg');

  // 分割图片为RGB通道
  $channels = array(0, 1, 2);
  $hist_size = array(16, 16, 16);
  $ranges = array(0, 255);

  $hist = cvCreateHist(3, $hist_size, CV_HIST_ARRAY, $ranges);
  cvCalcHist(array($img), $hist);

  // 输出颜色直方图
  for ($z = 0; $z < $hist_size[2]; $z++) {
      for ($y = 0; $y < $hist_size[1]; $y++) {
          for ($x = 0; $x < $hist_size[0]; $x++) {
              $value = cvQueryHistValue_3D($hist, $x, $y, $z);

              echo "($x, $y, $z): $value
";
          }
      }
  }

  // 释放资源
  cvReleaseHist($hist);
  cvReleaseImage($img);
?>

<?php
  // 计算两个颜色直方图的欧氏距离
  function calculateDistance($hist1, $hist2) {
      $distance = 0;

      for ($z = 0; $z < $hist1->size[2]; $z++) {
          for ($y = 0; $y < $hist1->size[1]; $y++) {
              for ($x = 0; $x < $hist1->size[0]; $x++) {
                  $value1 = cvQueryHistValue_3D($hist1, $x, $y, $z);
                  $value2 = cvQueryHistValue_3D($hist2, $x, $y, $z);

                  $distance += pow($value1 - $value2, 2);
              }
          }
      }

      return sqrt($distance);
  }

  // 读取两个图片的颜色直方图
  $hist1 = cvLoadHist('hist1.yml');
  $hist2 = cvLoadHist('hist2.yml');

  // 计算两个图片的相似度
  $distance = calculateDistance($hist1, $hist2);
  echo "Distance: $distance
";

  // 释放资源
  cvReleaseHist($hist1);
  cvReleaseHist($hist2);
?>

$ composer require qiniu/php-sdk

<?php
  require 'vendor/autoload.php';

  use QiniuAuth;
  use QiniuStorageUploadManager;

  $accessKey = 'your_accessKey';
  $secretKey = 'your_secretKey';
  $bucket = 'your_bucket';
  $key = 'your_key';

  $auth = new Auth($accessKey, $secretKey);
  $token = $auth->uploadToken($bucket);

  $filePath = 'image.jpg';

  $uploadManager = new UploadManager();
  list($ret, $err) = $uploadManager->putFile($token, $key, $filePath);

  echo "Upload result: 
";
  if ($err !== null) {
      var_dump($err);
  } else {
      var_dump($ret);
  }
?>

<?php
  require 'vendor/autoload.php';

  use QiniuAuth;
  use QiniuStorageUploadManager;
  use QiniuStorageBucketManager;

  $accessKey = 'your_accessKey';
  $secretKey = 'your_secretKey';
  $bucket = 'your_bucket';
  $key = 'your_key';

  $auth = new Auth($accessKey, $secretKey);
  $bucketManager = new BucketManager($auth);

  $fileInfo = $bucketManager->fetch($key, $bucket, $key);
  $persistKey = 'your_persistKey';

  // 存储图片信息到数据库
  // ...

  echo "Save result: 
";
  var_dump($fileInfo);
?>