How to implement OCR recognition function in PHP

With the continuous development of science and technology, optical character recognition (OCR) technology has become a very important direction in the field of artificial intelligence. PHP, the first version of the language released in 1995, has now become one of the most important tools for web application development. This article will introduce how to implement OCR recognition function in PHP.

1. Overview of OCR

OCR maintains the understanding of public will in many ways. It is a technology that converts paper or electronic documents into editable text through optical scanning or photography. This technology has extremely high accuracy, and people can quickly convert many paper materials into electronic versions through OCR technology. OCR technology is widely used in various industries, such as archiving documents, digitized books, banking and insurance services, etc.

2. Implementation Principle of PHP

PHP is a widely used server-side programming language. Currently, some major websites and applications are built using PHP. PHP provides a powerful mechanism that allows us to integrate OCR functionality into our website or application. Using PHP to perform OCR requires the following three steps:

1. Collect pictures or scanned images;
2. Send the image to the OCR library;
3. Parse the results returned by OCR and convert them Save in database.

3. OCR implementation library

PHP does not have a built-in OCR solution. But there are many OCR libraries available for performing OCR in PHP. The more commonly used OCR libraries are as follows:

1. Tesseract OCR:

Tesseract OCR is a free open source OCR library that supports more than 100 languages, and it is the leader in the OCR field. The performance is excellent.

Installing Tesseract OCR requires the following steps:

a. First install the engine: apt-get install tesseract-ocr.
b. Install PHP extension: sudo apt-get install php7.2-tesseract.
c. Download and use Tessaract OCR.

2.OCRopus:

OCRopus is a highly modular OCR solution developed by Google and provides main OCR functions. It is written in Python and is extensible.

Installing OCRopus requires the following steps:

a. Install Python and related dependencies;
b. Download the OCRopus library;
c. Install and run OCRopus.

3.GOCR:

GOCR is another popular OCR library, which is a free and open source OCR software developed by Thomas Rokicki.

Installing GOCR requires the following steps:

a. Install GOCR engine;
b. Install PHP extension;
c. Download and use GOCR.

4. Implementation code example

After installing the OCR library, you can use the following code to implement the OCR recognition function.

//Reference the Tesseract OCR library
namespace TesseractOCR;
use thiagoalessioTesseractOCRTesseractOCR;

//Set the location of the image to be parsed
$imageLocation = "images/test. png";

//Send the image to the Tesseract OCR library for parsing
$result = (new TesseractOCR($imageLocation))->run();

// Print OCR results
echo $result;

5. Notes

Before using any OCR library, you need to ensure that the input image quality is good enough so that it can be correctly recognized. Occasionally, OCR libraries will also have errors that need to be corrected manually depending on the situation.

6. Summary

In this article, we introduced how to implement OCR solutions in PHP. Three libraries, Tesseract OCR, OCRopus and GOCR, were selected to demonstrate how to use the OCR library to perform OCR operations in PHP. There will be some functional differences between these libraries. You can choose the one that suits you or Multiple libraries. When trying to use an OCR library please make sure the input image is of high quality in order to get correct results.

The above is the detailed content of How to implement OCR recognition function in PHP. For more information, please follow other related articles on the PHP Chinese website!