How to read or detect text from image using Google Vision API

How to read or detect text from image using Google Vision API

In this blog post, i will be able to allow you to skills to read content of images with Google Vision API.

Google Vision API can easily detect and extract text from a picture . There are two annotation features (TEXT_DETECTION, DOCUMENT_TEXT_DETECTION) that perform Optical Character Recognition and return the extracted text, if any.

In order to use Google Vision API, you'll need to create new project or select an existing project and enable the Vision API.

Below are the example to read the text from image using HTML, Css and PHP


<!DOCTYPE html>
<html>
<head>
    <title>How to read or detect text from image using Google Vision API </title>
</head>
<body>

    <form enctype="multipart/form-data" action="" method="POST">
        Choose an image to upload: <input name="image" type="file" /><br />
        <input type="submit" value="Upload Document" />
    </form>

<?php

$url = "https://vision.googleapis.com/v1/images:annotate?key={api_key}";
$detection_type = "TEXT_DETECTION";
$image_validation = array('image/jpeg','image/png','image/gif');

if($_FILES){

    // validate uploaded file for allowed mime type
    if(in_array($_FILES['image']['type'],$image_validation)){            

        // base64 encode image
        $image = file_get_contents($_FILES['image']['tmp_name']);
        $image_base64 = base64_encode($image);

        $json_request ='{
                  "requests": [
                    {
                    "image": {
                        "content":"' . $image_base64. '"
                      },
                      "features": [
                          {
                              "type": "' .$detection_type. '",
                              "maxResults": 200
                          }
                      ]
                    }
                ]
            }';

        $curl = curl_init();
        curl_setopt($curl, CURLOPT_URL, $url);
        curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($curl, CURLOPT_HTTPHEADER, array("Content-type: application/json"));
        curl_setopt($curl, CURLOPT_POST, true);
        curl_setopt($curl, CURLOPT_POSTFIELDS, $json_request);
        $json_response = curl_exec($curl);
        $status = curl_getinfo($curl, CURLINFO_HTTP_CODE);
        curl_close($curl);

        // verify if we got a correct response
        if ( $status != 200 ) {
            die("Something when wrong. Status code: $status" );
        }
        
        // create an image identifier for the uploaded file
        switch($_FILES['image']['type']){
            case 'image/jpeg':
                $im = imagecreatefromjpeg($_FILES['image']['tmp_name']);
                break;
            case 'image/png':
                $im = imagecreatefrompng($_FILES['image']['tmp_name']);
                break;
            case 'image/gif':
                $im = imagecreatefromgif($_FILES['image']['tmp_name']);
                break;
        }

        // transform the json response to an associative array
        $response = json_decode($json_response, true);            
        // display the first text annotation
        echo'<pre>';
        print_r($response['responses'][0]['textAnnotations'][0]['description']);
        echo'</pre>';
    
    }
    else{
        echo 'File type Invalied';
    }

    }
?>

</body>
</html>

Tags

  • How Google Vision API works

  • Google vision API pricing

  • Google vision API documentation

  • Google vision API demo
  • How to read or detect text from image using Google Vision API
  • Document text detection google vision

Related Posts

Outsource PHP development company

Outsource PHP development company

Blazingcoders provide you PHP Based web Development services to outsource clients all over the world. PHP is a well-known technology for producing dynamic web pages and w

Read More
jQuery DataTables Ajax based Or Server Side Sorting, Pagination and Searching

jQuery DataTables Ajax based Or Server Side Sorting, Pagination and Searching

jQuery DataTable server-side sorting, pagination, and searching using PHP and MySQL In this PHP Javascript Tutorial, I'm attending to tell you the way to use jQuery datatable plugin with Server

Read More
Delete ALL Files and Subfolders from Folder in PHP
PHP |

Delete ALL Files and Subfolders from Folder in PHP

How to delete all files and sub-folders from a folder using php. Like deleting all files of a user without activity for long time, deleting files older than 3 months etc. Whatever the reason, doing su

Read More