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Finding Connected components to a particular pixel in binary image

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Hi,
I have a binary image with many blobs. I want to know all the connected pixels to a particular pixel whose index I know before hand. How do i do that?

Answers (1)

KALYAN ACHARJYA
KALYAN ACHARJYA on 12 Dec 2017
Edited: KALYAN ACHARJYA on 12 Dec 2017
% Try following
CC=bwconncomp(binary_image); % Default 8 Pixel connected you can change it by
cc=bwconncomp(binary_image,disired_connected_value);
% For detail visit following link
https://in.mathworks.com/help/images/ref/bwconncomp.html
  1 Comment
RIshabh Golchha
RIshabh Golchha on 12 Dec 2017
bwconncomp gives me all the connected components. My problem statement is that I have a particular pixel index. I need all the connected components to that pixel.
If I use bwconncomp I will get all the connected pixels and then I will run a for loop and search the blob which contains my desired pixel. This will be computationally expensive. Is there a better way?

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