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

Static Website Design And Development Company Coimbatore

Static Website Design And Development Company Coimbatore

Static Website Design And Development Company Coimbatore. Blazingcoders is a leading web design and development company in Coimbatore. offering static website design and development services for a

Read More
Alumni Website Development And Design Company

Alumni Website Development And Design Company

In today’s interconnected world, alumni networks play a pivotal role in fostering relationships between institutions and their graduates. A well-designed and functional alumni website is the cor

Read More
Fireworks vs Photoshop – Where to use what?
FAQ |

Fireworks vs Photoshop – Where to use what?

It’s over the years that we heard about the Adobe Photoshop. It was a new software that helped all types of creatives designs. Yet, as it customary with technological progress, there is always i

Read More