How to choose the boundaries of the gray zone in the image?

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Kian Azami 2017-10-9

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评论： Kian Azami 2017-10-11

Footprint.jpg

I have an image and I would like to write a program in order to separate the gray part of the image which is a footprint of a tire. I think the algorithm should be similar to fingerprint detection, however, I don't have sufficient knowledge to do so. Can anyone suggest me a solution?

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Image Analyst 2017-10-9

Exactly what does separate mean to you?

Kian Azami 2017-10-9

Footprint.jpg

I mean to separate the zone which I determined by the red line.

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Akira Agata 2017-10-11

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By combining imclose, imopen, and bwconvhull functions, you can determine the target area. Here is an example.

% Read the image and binarize
I = imread('Footprint.jpg');
I = rgb2gray(I);
BW = imbinarize(I);
% Remove noise
se = strel('disk',5);
BW = imclose(BW, se);
BW = imopen(BW, se);
% Remove areas connected to image border
BW = imclearborder(BW,4);
% Generate convex hull image
ROI = bwconvhull(BW);
% Show the result
imshowpair(I,ROI)