Comparing if two images are "similar" is an extremely hard, research-class problem. The approach you'd use will depend heavily on the types of similarities/differences that you are expecting between your images.
It will be hard to find something that works off-the-shelf, unless your comparison requirements are very specific.
I know several people who have used or are using OpenCV. They seem to be very satisfied with what it can do and how easy it is to use. And from the problem you have described, OpenCV surely has that feature, and much more. I don't know of any library that compares to it. As for the BSD license, don't blame people who make source code available for free for not letting you make money off of it.
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比较两个图像是否“相似”是一个极其困难的研究级问题。您使用的方法在很大程度上取决于您期望的图像之间的相似性/差异类型。
除非您的比较要求非常具体，否则很难找到现成的可用工具。
可能有用的相关问题：
Comparing if two images are "similar" is an extremely hard, research-class problem. The approach you'd use will depend heavily on the types of similarities/differences that you are expecting between your images.
It will be hard to find something that works off-the-shelf, unless your comparison requirements are very specific.
Related questions that might be helpful:
我认识几个已经使用过或正在使用 OpenCV 的人。他们似乎对它的功能和使用的简单性非常满意。从你所描述的问题来看，OpenCV 肯定具有该功能，甚至更多。我不知道有哪个图书馆可以与之相比。至于 BSD 许可证，不要责怪那些免费提供源代码的人不让你从中赚钱。
I know several people who have used or are using OpenCV. They seem to be very satisfied with what it can do and how easy it is to use. And from the problem you have described, OpenCV surely has that feature, and much more. I don't know of any library that compares to it. As for the BSD license, don't blame people who make source code available for free for not letting you make money off of it.