如何改变拍下的文件看“扫描” [英] How to Alter Photographed Document to Look "Scanned"

问题描述

我怎样才能在Python / PIL中执行此操作？即，给定偏移矩形的四个点（拍摄的文档），使其看起来平坦，就好像它被扫描一样。它有一个简单的算法吗？

How can I do this in Python/PIL? I.e., given the four points of an offset rectangle (a photographed document), make it look flat on as if it were scanned. Is there a simple algorithm for it?

另外，我是否应该做任何其他操作以使其看起来更像扫描？

Also, are there any other manipulations I should do to make it look more "scan-like"?

我想在Python中为自己制作这个程序的简单版本。

I want to make a simple version of this program for myself in Python.

推荐答案

看在transform（）方法设置为QUAD

Look at transform() with method set to QUAD

http://effbot.org/imagingbook/image.htm

im.transform(size, QUAD, data) => image
im.transform(size, QUAD, data, filter) => image

将图像中的四边形（由四个角定义的区域）映射到给定的矩形大小。

Maps a quadrilateral (a region defined by four corners) from the image to a rectangle with the given size.

数据是8元组（x0，y0，x1，y1，x2，y2，y3，y3），包含左上角，左下角，下角右边和源四边形的右上角。

Data is an 8-tuple (x0, y0, x1, y1, x2, y2, y3, y3) which contain the upper left, lower left, lower right, and upper right corner of the source quadrilateral.

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