Determining the slope between relevant 2d objects

2 次查看（过去 30 天）
Kimo Kalip
Kimo Kalip 2018-6-29
编辑： Kimo Kalip 2018-7-3
Hello all, included I have my post processed image where I've done a lot of things to it, but basically got it to this post watershed state where the edges are quite segmented.
The idea here is I want to take the slope of the objects, then be able to draw some sort of conclusion from it. For example, if I were to draw a slope along the right side set of objects, would I get a regular gradual slope, or something more like a spline curve?
Main questions:
1. How do I extract the x-y coordinates from those identified objects?
2. Is it possible to draw a 'best fit line' of sorts between the right hand objects (ignoring the ones on the left?)
Thanks!
  1 个评论
jonas
jonas 2018-6-30
编辑：jonas 2018-6-30
How did you identify the objects? Can you post the code or a sample code?
From the name of the file I assume you used CC=BwConncomp. The output of that function includes a field CC.PixelIdxList, where the connected pixels for each object are stored.

请先登录，再进行评论。

请先登录，再回答此问题。

回答（1 个）

Image Analyst
Image Analyst 2018-6-30
Why not take the points and use poly2mask() to create a solid binary image mask from them?
Then you can call bwperim() or bwboundaries() to get the boundary/outline coordinates for every adjacent pixel.
  2 个评论
Kimo Kalip
Kimo Kalip 2018-7-3
编辑：Kimo Kalip 2018-7-3
Lets say I wanted to grab four points:
(Smallest x value, corresponding y value)
(Corresponding x value, smallest y value)
(Corresponding x value, highest y value)
(Highest x value, corresponding y value)
First off, how do I extract those particular numbers from the matrix containing the image? Secondly, do you think that would draw a box around my object that I could take the area of, and then try to work from there?
Kinda going off of the image in:
https://blogs.mathworks.com/steve/2006/12/05/poly2mask-and-roipoly-part-1/
Also, is the xi and yi values given in:
BW = poly2mask(xi,yi,m,n)
Are these arrays that I pass in those values that I want?

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Image Arithmetic 的更多信息

标签

产品


版本

R2017a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by