使用ImageMagick比较两个图像 [英] Compare two images with ImageMagick

问题描述

我试图拍摄两个图像，并使用ImageMagick进行比较。

我想知道图片是否接近相同，并返回一个数字存储在PHP的变量中，并显示在浏览器屏幕中。

我的主机帐户是与bluehost和我已通过调整图像大小和ImageMagick安装和运行测试。以下代码适用于此处： http://zing-cards.com/imagetest2.php p>

 <？php 
 $ photo =/ home / tcsdesig / public_html / zing / flower.jpg 
 $ cmd =/ usr / bin / convert $ photo -thumbnail 100x100 JPG： - ; 
 
 header（Content-type：image / jpeg）; 
 passthru（$ cmd，$ retval）; 
 
？> 
  

我理解以下命令行代码（根据 post ）应该以数字格式获得结果：

  compare -metric RMSE first.png second.png NULL：
  

以下是我的代码：

 <？php 
 $ photoPath1 =/ home / * username * / public_html / flower.jpg; 
 $ photoPath2 =/ home / * username * / public_html / flower1.jpg; 
 
 $ cmd =/ usr / bin / compare -metric RMSE $ photoPath1 $ photoPath2 NULL：; 
 exec（$ cmd）; 
？> 
  

如何在浏览器中显示此值？

除了上面的代码，我已经尝试：

  $ result = exec（$ cmd）; 
 echo $ result; 
  

根据我的理解，这应该显示一个低数字（因为图像相等）

解决方案

这里如果我这样做

 <？php 
 $ photoPath1 =/ home / * username * / public_html / flower.jpg; 
 $ photoPath2 =/ home / * username * / public_html / flower1.jpg; 
 
 $ result = exec（/ usr / bin / compare -metric RMSE /usr/share/pixmaps/faces/dice.jpg /usr/share/pixmaps/faces/fish.jpg NULL： ）; 
 echo $ result; 
？> 
  

我得到

 code> 20455.4（0.312129）
  

这是我期望的，因为图像是完全不同的...

我想你应该在命令行上尝试 compare >

例如，如果您的系统上没有安装比较，您将无法获得任何结果...

UPDATE ：若要进一步调查持续缺少输出的情况，请执行以下操作：

 <？php 
 $ photoPath1 =/home/*username*/public_html/flower.jpg; 
 $ photoPath2 =/home/*username*/public_html/flower1.jpg; 
 
 $ compareCommand =/ usr / bin / compare; 
 if（！is_executable（$ compareCommand））die（Sorry，can not execute $ compareCommand！ 
 $ output = shell_exec（$ compareCommand -metric RMSE $ photoPath1 $ photoPath2 NULL：2>& 1）; 
 print $ output; 
？> 
  

UPDATE 2

在注释中回答OP问题：

在convert man页面中没有指定如何以及如何只打印RMSE错误百分比...

您可以添加（例如） | sed -e's /.*（\（。* \））/ \1 / g'到命令，只保留RMSE错误百分比...

I am trying to take two images and compare them using ImageMagick.

I want to find out if the images are close to the same and return a number to be stored in a variable in php and displayed in my browser screen.

My hosting account is with bluehost and I have tested by resizing an image and ImageMagick is installed and running. The following code works here: http://zing-cards.com/imagetest2.php

<?php
$photo="/home/tcsdesig/public_html/zing/flower.jpg";
$cmd = "/usr/bin/convert $photo -thumbnail 100x100 JPG:-";

header("Content-type: image/jpeg");
passthru($cmd, $retval);

?>

I understand the the following command line code (according to this post) is supposed to get the results in a number format:

compare -metric RMSE first.png second.png NULL:

Here is my code so far:

<?php
$photoPath1="/home/*username*/public_html/flower.jpg";
$photoPath2="/home/*username*/public_html/flower1.jpg";

$cmd = "/usr/bin/compare -metric RMSE $photoPath1 $photoPath2 NULL:";
exec($cmd);
?>

How do I make this value show in my browser?

Other than the above code I have tried:

$result = exec($cmd);
echo $result;

From what I understand this should display a low number (since the images are equal) and if I use completely different images they should display a high number but I don't get any results.

解决方案

Here if I do

<?php
    $photoPath1="/home/*username*/public_html/flower.jpg";
    $photoPath2="/home/*username*/public_html/flower1.jpg";

    $result = exec("/usr/bin/compare -metric RMSE /usr/share/pixmaps/faces/dice.jpg /usr/share/pixmaps/faces/fish.jpg NULL:");
    echo $result;
?>

I get

20455.4 (0.312129)

Which is what I expect, because the images are completely different...

I suppose you should try compare on the command-line, beforehand...

For example, if you don't have compare installed on your system, you don't get any results...

UPDATE: To further investigate in case of persistent lack of output, please do:

<?php
    $photoPath1 = "/home/*username*/public_html/flower.jpg";
    $photoPath2 = "/home/*username*/public_html/flower1.jpg";

    $compareCommand = "/usr/bin/compare";
    if (!is_executable($compareCommand)) die("Sorry, can't execute $compareCommand!");
    $output = shell_exec("$compareCommand -metric RMSE $photoPath1 $photoPath2 NULL: 2>&1");
    print $output;
?>

UPDATE 2

Answering OP question in comment:

In the convert man page it's not specified if and how it's possible to print only the RMSE error percentage...

You could add (for example) a | sed -e 's/.*(\(.*\))/\1/g' to the command, to just keep RMSE error percentage...

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