I have some images that takes using mobile phone. Is there any JavaScript library which can straighten the photo of a paper and flatten it? For example I want to create a rectangular image without any distortion from this image.
In the other words I want to know how to fix perspective distortion and rotation with JavaScript?
For example I found below sample image from this article:
How to fix this type of image with javascript?
Looks like https://www.npmjs.com/package/perspective-transform is what you are looking for.
Create functions to map points from one arbitrary quadrilateral to another and vice versa with the inverse
JSFeat can do that for you. There even is an example for perspective distortion. You'll have to add/compute the source and destination points yourself.
来源：https://stackoverflow.com/questions/33470757/how-to-fix-image-perspective-distortion-and-rotation-with-javascript