Sobel operator

This is Sobel operator (or Sobel filter) implementation on PHP. It used in image processing and computer vision, particularly within edge detection algorithms. Read full article in Wikipedia

Installation

composer require qmegas/sobel-operator

Requirements

PHP >= 7.0

Usage Examples

<?php

$sobel = new \Qmegas\SobelOperator();
$image = imagecreatefromjpeg('1.jpg');
header('Content-type: image/png');
imagepng($sobel->applyFilter($image));

Options

Parameter	Description
flat	Enables flat mode
threshold	Set threshold manually. In case that parameter is not set, algorithm choose threshold automatically
return_threshold	Return an array of two elements. First one is an image with Sobel filter applied, second element is value of applied threshold

<?php

$sobel = new \Qmegas\SobelOperator();
$image = imagecreatefromjpeg('1.jpg');
header('Content-type: image/png');
imagepng($sobel->applyFilter($image, [
	'flat' => true,
	'threshold' => 30,
]));