Understand the underlying development principles of PHP: image processing and image recognition technology

Understand the underlying development principles of PHP: image processing and image recognition technology

With the development of the Internet, image processing and image recognition technology have been widely used in various fields application. In the underlying development of PHP, image processing and image recognition technology also play an important role. This article will introduce image processing and image recognition technology in the underlying development of PHP, and provide corresponding code examples.

1. Image processing technology

1.1 Zooming pictures

Zooming pictures is one of the common image processing operations. In the underlying development of PHP, you can use the GD library to implement the image scaling function. The GD library is an open source image processing library that provides a series of functions that can be used to create, manipulate and output images.

The following is a sample code that demonstrates how to use the GD library to scale images:

<?php
// 设置源图片路径和目标图片路径
$srcFile = 'source_image.jpg';
$dstFile = 'target_image.jpg';

// 获取源图片的宽度和高度
list($srcWidth, $srcHeight) = getimagesize($srcFile);

// 设置目标图片的宽度和高度
$dstWidth = 300;
$dstHeight = 200;

// 创建源图片资源
$srcImage = imagecreatefromjpeg($srcFile);

// 创建目标图片资源
$dstImage = imagecreatetruecolor($dstWidth, $dstHeight);

// 缩放源图片到目标图片
imagecopyresampled($dstImage, $srcImage, 0, 0, 0, 0, $dstWidth, $dstHeight, $srcWidth, $srcHeight);

// 保存目标图片到文件
imagejpeg($dstImage, $dstFile);

// 释放资源
imagedestroy($srcImage);
imagedestroy($dstImage);

// 输出成功提示
echo '图片缩放成功！';
?>

1.2 Image Watermark

Image watermark is a method to increase image protection and brand promotion . In the underlying development of PHP, you can use the GD library to implement the image watermark function.

The following is a sample code that demonstrates how to use the GD library to add image watermarks:

<?php
// 设置源图片路径和水印图片路径
$srcFile = 'source_image.jpg';
$watermarkFile = 'watermark_image.png';
$dstFile = 'target_image.jpg';

// 获取源图片的宽度和高度
list($srcWidth, $srcHeight) = getimagesize($srcFile);

// 创建源图片资源
$srcImage = imagecreatefromjpeg($srcFile);

// 创建水印图片资源
$watermarkImage = imagecreatefrompng($watermarkFile);

// 获取水印图片的宽度和高度
list($watermarkWidth, $watermarkHeight) = getimagesize($watermarkFile);

// 计算水印图片的位置
$x = $srcWidth - $watermarkWidth - 10;
$y = $srcHeight - $watermarkHeight - 10;

// 合并源图片和水印图片
imagecopy($srcImage, $watermarkImage, $x, $y, 0, 0, $watermarkWidth, $watermarkHeight);

// 保存合并后的图片到文件
imagejpeg($srcImage, $dstFile);

// 释放资源
imagedestroy($srcImage);
imagedestroy($watermarkImage);

// 输出成功提示
echo '图片添加水印成功！';
?>

2. Image recognition technology

Image recognition technology refers to the use of computers to process images Process and analyze to identify the content in the image. In the underlying development of PHP, the deep learning framework TensorFlow can be used to implement image recognition functions.

The following is a sample code that demonstrates how to use the TensorFlow library for image recognition:

<?php
// 设置图像路径
$imageFile = 'image.jpg';

// 加载TensorFlow库
$tensor = new TensorFlowTensor();

// 加载模型和标签文件
$modelFile = 'model.pb';
$labelFile = 'labels.txt';

// 加载图像
$imageData = file_get_contents($imageFile);
$tensor->loadJPEG($imageData);

// 加载模型和标签
$tensor->loadGraphModel($modelFile);
$tensor->loadLabels($labelFile);

// 进行图像识别
$results = $tensor->run();

// 输出识别结果
foreach ($results as $label => $score) {
    echo $label . ': ' . $score . '<br>';
}
?>

Summary:

This article introduces image processing and image recognition in the underlying development of PHP technology, and provides corresponding code examples. By learning and understanding these technologies, they can be better applied in actual development and provide users with better experiences and functions. At the same time, you can also broaden your technical fields and improve your development capabilities. I hope that readers can have a preliminary understanding of image processing and image recognition technology in PHP underlying development through the introduction and examples of this article.

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