How to extract specific edges from an image?
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Hello eveyone, I have an image of a car door from which I have to find generate a trajectory from specific edges of the car door. Let me expain the detail about my project.
Project: Finding the edges of a door and used those edges as a trajectory for a sensor that checks edges for Gap/Flush.
Principle: I used Savitzky Golay, Edge Linking and Line Segment Fitting (https://www.peterkovesi.com/matlabfns/#step2line).
Method I used: Image Analyst's Savitzky filter smoothening at three diffrent thresholds, obtain three images and blend them. The output is again processed to Edge linking and line segmenting program.
After all this I am not able to get good edges, its either not smooth or has a lot of unnecessary edges. But the main problem is I am getting a lot of unnecessary edges in the image. To get a Trajectory I need only Three specific edges which I have marked by hand below in red.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/290726/image.jpeg)
Questions:
- How to remove unnecessary edges out of the image. Please suggest me a way to get only those three edges? (without manual intervention)
- How to smoothening those edges and join them so that i can use it as trajectory for another program?
I have attached the images of input and output. Sorry for the long question.
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Image Analyst
2020년 5월 7일
If you have an edge image with a bunch of edges but want edges from only certain locations, you maybe best off using a mask/template to erase everything outside the areas you want to look in.
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Image Analyst
2020년 7월 9일
Try a threshold that gets all the edges then use bwselect() to manually pick out the one you want.
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