README

一个在PHP脚本中与TesseractOCR一起工作的包装器。基于 https://github.com/wangoviridans/tesseract-ocr-for-php

安装

通过 composer (https://packagist.org.cn/packages/wangoviridans/tesseract_ocr)

{
    "require": {
        "wangoviridans/tesseract_ocr": ">= 0.0.1"
    }
}

或者直接克隆并将其放在项目文件夹的某个地方。

$ cd myapp/vendor
$ git clone git://github.com/wangoviridans/tesseract-ocr-for-php.git

依赖项

• TesseractOCR

重要：请确保 tesseract 二进制文件位于您的 $PATH 中。如果您在Web服务器上运行PHP，用户可能不是您，而是 _www 或类似用户。如果需要，您始终可以修改您的 $PATH

$path = getenv('PATH');
putenv("PATH=$path:/usr/local/bin");

用法

基本用法

<?php
require_once '/path/to/src/TesseractOCR.php';
//or require_once 'vendor/autoload.php' if you are using composer

$tesseract = new TesseractOCR();
$tesseract->setImage('images/some-words.jpg');
echo $tesseract->recognize();

or

<?php
require_once '/path/to/src/TesseractOCR.php';
//or require_once 'vendor/autoload.php' if you are using composer

$tesseract = new TesseractOCR(array(
    'file.input' => 'images/some-words.jpg'
));
echo $tesseract->recognize();

定义语言

Tesseract为几种语言提供了训练数据，这无疑提高了识别的准确性。

<?php
require_once '/path/to/src/TesseractOCR.php';
//or require_once 'vendor/autoload.php' if you are using composer

$tesseract = new TesseractOCR('images/sind-sie-deutsch.jpg');
$tesseract->setLanguage('deu'); //same 3-letters code as tesseract training data packages
echo $tesseract->recognize();

or

<?php
require_once '/path/to/src/TesseractOCR.php';
//or require_once 'vendor/autoload.php' if you are using composer

$tesseract = new TesseractOCR(array(
    'file.input' => 'images/sind-sie-deutsch.jpg',
    'language' => 'deu' //same 3-letters code as tesseract training data packages
));
echo $tesseract->recognize();

诱导识别

有时tesseract会误解一些字符，例如

0 - O
1 - l
j - ,
etc ...

但您可以通过指定您发送的字符类型来提高识别准确性，例如

<?php
$tesseract = new TesseractOCR();
$tesseract->setImage('my-image.jpg')
          ->setWhitelist(range('a','z')); //tesseract will threat everything as downcase letters
echo $tesseract->recognize();

$tesseract = new TesseractOCR();
$tesseract->setImage('my-image.jpg')
          ->setWhitelist(range('A','Z'), range(0,9), '_-@.'); //you can pass as many ranges as you need
echo $tesseract->recognize();

您甚至可以做一些 酷 的事情，比如这个

<?php
$tesseract = new TesseractOCR();
$tesseract->setImage('my-image.jpg')
          ->setWhitelist(range('A','Z'));
echo $tesseract->recognize(); //will return "GIT"

故障排除

类似 权限被拒绝 或 没有找到文件或目录 的警告

要解决这个问题，您可以指定一个自定义的临时文件目录

<?php
$tesseract = new TesseractOCR();
$tesseract->setImage('my-image.jpg')
          ->setTempDir('./my-temp-dir');

or

<?php
$tesseract = new TesseractOCR(array(
    'file.input' => 'my-image.jpg',
    'tempDir' => './my-temp-dir'
));