Select image region using point coordinates
显示 更早的评论
Hi, I was wondering if someone could do quickly and efficiently the selection of a region within the multiple ones that matlab manages to detect using the regionprops function in whose interior is a point that is defined by its x and y coordinates.
采纳的回答
Image Analyst
2021-4-16
The built-in function for this is bwselect(). Like
oneBlob = bwselect(multiBlobMask, x, y); % Return only the single blob that contains (x, y).
Here is the help:
bwselect
Select objects in binary image
Syntax
Description
2 个评论
Alejandro Fernández
2021-4-16
Image Analyst
2021-4-16
Alejandro, there is another related function that you maybe interested in. It's called imreconstruct(). With that function you give it a mask (with multiple blobs in it), and a "marker" image that has a subset of blobs. Then when you call imreconstruct, it will return only those blobs that overlap any part of a marker blob. So instead of giving it a coordinate or list of coordinates to tell it which blob(s) to extract, you give it an image.
So for example let's say you had an aerial photo of your neighborhood and wanted to find lawns that had white flowering trees on them (like many of them in my neighborhood do this week). So you'd have one mask of only the lawns, then another "marker" image of only the trees, then after you call imreconstruct, you'd get only those lawns that had the white flowering trees on them, and not any of the other lawns.
更多回答（1 个）
Matt J
2021-4-16
regions=regionprops(yourImage,'PixelList');
detector=@(s) ismember([x,y], s.PixelList,'rows');
find( arrayfun( detector , region ) )
类别
在 帮助中心 和 File Exchange 中查找有关 Region and Image Properties 的更多信息
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
