How to detect a polygon of following Shape in an image with other objects. I greatly appreciate for some help.

2014 9 11
2 个回答
更新时间：2014 9 13
7 次查看（30 天）

回答（2 个）

Image Analyst
Image Analyst 2014-9-11

0 个投票

Define exactly what does "detect" mean to you.
In hte meantime, see my Image Segmentation Tutorial: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862

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Rohit Tripathi
Rohit Tripathi 2014-9-12
Sir First thanks for your answer, I actually want to detect a L shape polygon from a image...Image may contain many object but i want only that part of image that contain L shape Polygon.
Image Analyst
Image Analyst 2014-9-12
I still don't know what that means. Do you want a binary image of the black outlines region filled in? Or of just the black outline itself? Or of the (x,y) coordinates of the outer and inner perimeter of the black outline? Or the area of the filled object? Or the area of only the black outline itself? Or just a yes/no decision if there is something black in the image? Or something else?
Rohit Tripathi
Rohit Tripathi 2014-9-12
编辑：Image Analyst 2014-9-12
Sir consider the following image from which i want to detect only the polygon of L shape..ie my output would be the L shape polygon with 6- vertices
Output should be like following....that is L shaped polygon detected in the image
Image Analyst
Image Analyst 2014-9-12
What can vary? Easiest is to just find purple blobs of that particular color. But if they can vary in color, that might not work. Could all the shapes be the same size? Can the L vary in aspect ratio? If not, the solidity would be a good thing to measure, and probably the next easiest.
This looks so fake that it's probably your homework assignment rather than a real world situation. What's the use case here?
Rohit Tripathi
Rohit Tripathi 2014-9-12
Sir color can vary....and L can vary in aspect ratio too....Sir actually i want to detect real world objects which can be map to some polygon. Is there any method so that we can detect polygon of any shape ?
Image Analyst
Image Analyst 2014-9-12
Alright, I did it for you. It works for this image. Since you didn't answer the question about what can vary from image to image, I give no gaurantees that it works for other images. See code attached below image.

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Rushikesh Tade
Rushikesh Tade 2014-9-12
编辑：Rushikesh Tade 2014-9-12

0 个投票

You can use Active shape model for that.
Here is one paper which seems to be solving same type problem. Download Paper

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Rohit Tripathi
Rohit Tripathi 2014-9-12
Thanks for your answer....Sir the paper u have mentioned does not exist on the link u have provide...sir please provide the paper. Thanks in advance...

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