寻找纳米粒子
我需要一些帮助。我有这个示例：
这是一块塑料，里面有一些纳米粒子（您可以看到小黑色点）。有人可以帮助我找出一种快速而肮脏的算法，我可以找到粒子并将它们涂成另一种颜色。
I need some help. I have this sample:
which is a piece of plastic with some nanoparticles inside (you can see the small black dots). Can someone help me figure out a quick and dirty algorithm where I can find the particles and color them in another color.
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又快又脏……好吧:)
Quick and dirty... OK :)
你说“快速而肮脏”，但考虑到这是 matlab，你可能不会注意到最佳解决方案和“快速而肮脏的解决方案”之间的区别。这可能是完成该任务的最佳方法：尺度空间斑点检测。使用拉普拉斯方法是最简单的。
首先使用接近预期纳米粒子标准差的西格玛对图像进行高斯模糊：即屏幕宽度的四分之一。
那么你的斑点将是拉普拉斯算子最负的点；确保它比周围的点具有更大的幅度，然后进行简单的阈值处理就可以了。要了解如何在 matlab 中实现此功能，请访问：
http://dl.acm.org/ itation.cfm?id=363419.363423
大约只有 10 行代码。
另外，当您处理传输而不是反射时，请记住使用对数（分贝）标度。
You say quick 'n dirty, but given this is matlab you probably won't notice a difference between the best solution and a "quick and dirty one". Here is what is probably straight-up the best way to accomplish the task: Scale-space blob detection. Using the laplacian method is the simplest.
Start by Gaussian-blurring you image with a sigma close to that of your expected nano particle standard deviation: IE a quarter of its screen width.
Then your blobs will be the points where the Laplacian is most-negative; ensuring that it has greater magnitude than its surrounding points followed by a simple thresholding will do. To see how to implement this in matlab go to:
http://dl.acm.org/citation.cfm?id=363419.363423
It will only be about 10 lines of code.
Also, remember to work on a logarithmic (decibel) scale as you are dealing with transmission rather than reflection.
这不是在 Matlab 中，而是 WolframBlog 为 Mathematica 介绍了类似的内容，它可能适合您的需求。
This isn't in Matlab, but the WolframBlog covered something like this for Mathematica and it may suit your needs.