regionprops

Question

Mary Kodogianni 2011-3-30

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/4358-regionprops

评论： Amit Kumar 2020-8-14

采纳的回答： David Young

I would like someone to give me a good example to understand the use of regionprops with 'PixelList' as a parameter

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Walter Roberson 2013-3-25

Rod, you have not indicated what your question is.

Note: the Image Processing Toolbox is included with the Student Version license, but is not necessarily installed by default.

Amit Kumar 2020-8-14

You can use Online MATLAB for assessing Image Processing Toolbox. Even I was not having it, but on Online MATLAB platform its available.

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Answer 1

David Young 2011-3-31

3
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/4358-regionprops#answer_6170

在 MATLAB Online 中打开

Try this for a start:

img = zeros(5,5);
img(2:4, 2:4) = 1;
props = regionprops(img, 'PixelList');
disp(img);
disp(props.PixelList);

You can change the pattern of ones in img until you're clear about how the result is structured. Another simple but informative example:

img = zeros(5,5);
img(2,2) = 1;
img(4,4) = 2;
props = regionprops(img, 'PixelList');
disp(props(1).PixelList);
disp(props(2).PixelList);

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Gopika Babu 2020-3-3

i have some doubt

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Answer 2

Saneem Ahmed 2011-3-31

2
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/4358-regionprops#answer_6152

regionprops is a function which is used on a labeled image. If we are having an image im. let it be a black and white image( values are either 1's or 0's). Now apply bwlabel to label image for this image.

[label n]=bwlabel(im); %n gives number of clusters, no.of groups of 1's. 0's are considered to be background.

now the label image can be put as input to regionprops to find certain characteristics about each clusters in the image. regionprops can give us area, bounding box, centroid, eccentricity etc of each cluster. 'PixelList' in regionprops will return pixel co-ordinates of each element in cluster. code can be like...

pix = regionprops(label.'PixeList');

list1=pix(1).PixelList; % we have to access like this coz regionprops gives output as a structure. similarly we can access every cluster.

listn=pix(n).PixelList;