PHP と Qiniu クラウド ストレージ インターフェイスを使用して画像の特徴抽出と類似性マッチングを実現する方法

$ 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);
?>