Matlab讨论区 - 声振论坛 - 振动,动力学,声学,信号处理,故障诊断

ffmsxx 发表于 2006-11-18 21:36

求助！如何求曲线上所有点的坐标？

如图如何求曲线上所有点的坐标？哪位高手能编个程序实现啊？谢谢了先！

[ 本帖最后由 ffmsxx 于 2006-11-18 21:45 编辑 ]

eight 发表于 2006-11-18 21:41

原帖由 ffmsxx 于 2006-11-18 21:36 发表
如图如何求曲线上所有点的坐标？哪位高手能编个程序实现啊？谢谢了先！

请搜索论坛

ffmsxx 发表于 2006-11-18 22:00

在论坛搜索里找不到具体的啊，都是讲一些原理，谁能帮忙直接编个程序实现啊？万分感激！

eight 发表于 2006-11-18 22:03

原帖由 ffmsxx 于 2006-11-18 22:00 发表
在论坛搜索里找不到具体的啊，都是讲一些原理，谁能帮忙直接编个程序实现啊？万分感激！

这个在仿真论坛上不是有了回复了吗？你的数据是二值的，直接用imread不行吗？把值为0的去掉

eight 发表于 2006-11-18 22:09

原帖由 ffmsxx 于 2006-11-18 22:00 发表
在论坛搜索里找不到具体的啊，都是讲一些原理，谁能帮忙直接编个程序实现啊？万分感激！

实在不行的话随便用一种轮廓跟踪算法都可以得到每点的坐标

ffmsxx 发表于 2006-11-18 22:16

可以用imrea读入，我也可以在 array editor 里查到这些点，但怎么能让它具体的显示出来？

eight 发表于 2006-11-18 22:19

原帖由 ffmsxx 于 2006-11-18 22:16 发表
可以用imrea读入，我也可以在 array editor 里查到这些点，但怎么能让它具体的显示出来？

没弄懂

ffmsxx 发表于 2006-11-18 22:37

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上面的数中，我可以看出 “1”所在的行和列，也就是其中一个点的坐标,例如弟99行 364列就是一个“1”，所以这个“1” 所在的点的坐标就是（364，99）但是这只是我直观的看出来的，有没有什么方法能让matlab 将所有的 “1”所在的行和列都显示出来，而不是有我直观的看出来的啊！不知道我说清楚没有。唉，麻烦 eight 老兄了！

jimin 发表于 2006-11-18 23:44

=find(a==1);

walj_19992000 发表于 2006-11-18 23:47

新手,刚来.
希望能向各位学习

xjzuo 发表于 2006-11-19 09:40

画了一下图形,不知是否是你要的效果.

ffmsxx 发表于 2006-11-19 12:17

原帖由 jimin 于 2006-11-18 23:44 发表
=find(a==1);
我试了一下，但并不和轮廓线的坐标一致啊？

xjzuo老兄，图画出来了，但坐标怎么能显示出来？

谢谢各位的热心帮助！！！

eight 发表于 2006-11-19 12:27

原帖由 ffmsxx 于 2006-11-19 12:17 发表

我试了一下，但并不和轮廓线的坐标一致啊？

xjzuo老兄，图画出来了，但坐标怎么能显示出来？

谢谢各位的热心帮助！！！

不一致？怎会呢？

ffmsxx 发表于 2006-11-19 12:34

原帖由 xjzuo 于 2006-11-19 09:40 发表
画了一下图形,不知是否是你要的效果.

能不能把程序传上来？谢谢！

xjzuo 发表于 2006-11-19 15:53

为了减小矩阵,我稍微裁剪了一下你的图形,另存为了z11.jpg. 程序如下：
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
RGB=imread('z11.jpg');
bw=flipud(im2bw(RGB,0.4));
=size(bw);
k=0;
for i=1:m
for j=1:n
   if bw(i,j)~=0;
         k=k+1;
         x(k)=j;
         y(k)=i;
   end
end
end
plot(x,y,'.')
axis equal
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
其中x,y的度量单位为1；如果想改变标度,作相应的scale即可．

这个问题其实就是一个常见问题，即：如何提取一副图像的边缘，
然后求出边缘的坐标点．

页: [1] 2

声振论坛's Archiver

求助！如何求曲线上所有点的坐标？

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