Detailed explanation of how to implement a simple image edge detection in PHP

This article will introduce to you how to implement a simple image edge detection in PHP. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to everyone.

php Implement a simple image edge detection

A simple image edge detection method

General steps:

1. Scale the image to improve efficiency

2. Grayscale the image

3. Calculate the edge based on brightness

The third step is the most critical, and there are many methods The direct contrast used here is between adjacent brightnesses.

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Usage:

Installation

composer require lizhichao/one-img

Use

$img_path = '1.jpg';
$img = new \OneImg\Border();
$img->setImg($img_path)
    ->scale(300, 300)
    ->outline()
    ->save(); //输出到浏览器

Effect

Code warehouse

https://github.com/lizhichao/doImg

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