Using PHP and Tesseract to implement OCR image text recognition function

With the rapid development of artificial intelligence and computer vision technology, OCR (Optical Character Recognition), the optical character recognition system, is becoming more and more mature and has become a necessary function in many application scenarios. The OCR system can recognize the text in the image, so that the information in the image can be digitally processed and intelligently analyzed. This article will introduce how to use PHP and Tesseract to implement OCR image text recognition function.

1. Introduction to Tesseract

Tesseract is an open source OCR engine developed by HP Labs and contributed to the open source community. It supports multiple languages, has high recognition and high accuracy. The latest version of Tesseract is 4.1.1.

2. Configure the environment and install Tesseract

1. Install PHP

First you need to install PHP locally or on the server. If the XAMPP or WAMP environment is already installed on this machine, you can directly use the php that comes with xampp or wamp. If not, you need to install it manually.

2. Install Tesseract

Download Tesseract from the official website https://github.com/tesseract-ocr/tesseract, and choose to download according to the operating system you are using. Install after the download is complete. If you need to use Chinese, you also need to download the corresponding language pack.

Execute tesseract --version in the command line window to verify whether Tesseract is installed successfully.

3. Use PHP and Tesseract to implement OCR image text recognition function

1. Install and install PHP and install Tesseract

First, you need to install PHP and install Tesseract.

2. Pass in the image path and execute the command recognition

Use the exec function (or shell_exec() or system()) to execute the command to recognize the text in the image. The parameters passed in are the command parameters required by Tesseract, where "chi_sim" is the language to be recognized and can be modified as needed.

$command = "tesseract ". $image_path ." " .$output_path." -l chi_sim";
//Execute command
exec($command);

3. Get the recognition result

Use the file_get_contents() function to get the final recognition result and return it.

if (file_exists($output_path.'.txt')) {

    $content = file_get_contents($output_path.'.txt');
    //返回识别结果
    return $content;

}

4. Test

The following is a simple example. Test whether the OCR image text recognition function works properly.

(1) First you need to prepare a picture, here we use a picture containing Chinese text.

(2) Pass the image path to be recognized and the output result path into the function. The code is as follows:

function ocr($image_path, $output_path) {

$command = "tesseract ". $image_path ." " .$output_path." -l chi_sim"; 
//执行命令
exec($command);

if (file_exists($output_path.'.txt')) {
    $content = file_get_contents($output_path.'.txt');
    //返回识别结果
    return $content;
}

}

(3) Call the function and output the result, the code is as follows:

$image_path = './test.jpg';
$output_path = './test';
$result = ocr($image_path,$output_path);

echo $result;

(4) Run the program. If everything is normal, the following results will be output:

"This is a test image containing Chinese text."

5. Summary

Through the introduction of this article, readers can learn how to use PHP and Tesseract to implement the OCR image text recognition function. For some application scenarios that require image text recognition, fast and accurate text extraction can be achieved, improving work efficiency and accuracy. Of course, in different application scenarios, we need to modify and optimize the code according to actual needs to truly achieve better results.

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