问题描述
我有一大堆插图图片，我想裁剪到较小的预览尺寸。
I have a whole bunch of images of illustrations that I would like to crop to a smaller preview size.
问题在于我想裁剪它们以显示插图的有趣部分（即避开空白区域）。
The problem is that I want to crop them to show an "interesting" part of the illustration (ie avoid areas of whitespace).
图像通常具有平面颜色或背景的细微渐变。它们大多是矢量风格的艺术品，形状各异。
The images typically have a flat color or a subtle gradient for the background. They are mostly vector style artwork with fairly distinct shapes.
以下是一些例子：; - ）
Here are some examples: link ;-)
我一直在考虑使用某种图像特征检测算法有一个滑动窗口，可以找到功能最多的区域。
I've been thinking about using some sort of image feature detection algorithm with a sliding window to find the area with the greatest number of features.
我在PHP中实现这个，但我不介意自己实现它，如果有的话没有图书馆或分机。
I'm implementing this in PHP, but I don't mind implementing it myself if there isn't a library or extension available.
想法？
推荐答案
有操作。它可以作为库使用，但我不知道从PHP使用有多难。有一些。
ImageMagick has a trim operation. It's available as a library but I don't know how hard it is to use from PHP. There are some PHP interfaces.
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