如何检测图像内部纸张的边框并使用ImageMagick进行裁剪？ [英] How can I detect borders of a piece of paper inside of an image and crop it using ImageMagick?

问题描述

我正在尝试从照片中裁剪纸质文档。例如，有人拍摄文档的照片并将其发送到服务器，它将被编辑为看起来像扫描文档。如何检测文档的边框并使用ImageMagick裁剪它？

I'm trying to crop paper documents from photographs. For example, someone takes a picture of a document and sends it to the server and it will get edited to look like a scanned document. How can I detect the border of the document and crop it using ImageMagick?

谢谢

推荐答案

你想使用convert命令和 -trim option 裁剪纯色边框，自此扫描图像， -fuzz选项以确保修剪即使颜色不完全坚固，也完全裁剪边框。

You want to use the convert command with the -trim option to crop out the solid color borders, and since the images are scanned, the -fuzz option to make sure trim completely crops the border even if the color isn't perfectly solid.

所以这样的事情：

convert input.jpg -fuzz 2% -trim output.jpg

将其翻译成PHP代码，你最终得到这个：

Translating that into PHP code, you'd end up with this:

$image = new Imagick('input.jpg');
$image->trimImage(2); // Trim the image with a 2% fuzz
$image->writeImage('output.jpg');

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