Can I use regionprops two times with two different variables in the same program at time?

Question

Zara Khan 2018-9-18

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/419625-can-i-use-regionprops-two-times-with-two-different-variables-in-the-same-program-at-time

评论： Zara Khan 2018-9-19

if true
  clc;
close all;
clear;
workspace;
folder = pwd;
% folder = pwd;
filepattern = fullfile(folder, '*.png');
srcFiles = dir(filepattern);
numImages = length(srcFiles);
for k = 1 : numImages
  fullFileName = fullfile(folder, srcFiles(k).name);
  a = imread(fullFileName);
  bwimg =bwareafilt(~a, 1); 
s=regionprops(bwimg,'Orientation');
theta = s(1).Orientation;
if theta>=0 && theta<90 
phi=90-theta;
Y=imrotate(bwimg,phi);
else
phi=90+theta;
Y=imrotate(bwimg,-phi);
end
s1=regionprops(Y,'Centroid','BoundingBox','MajorAxisLength','MinorAxisLength');
circleCenterX = s1.Centroid(1);
circleCenterY=  s1.Centroid(2);
diameters = mean([s1.MajorAxisLength s1.MinorAxisLength],2);
end
end

This is showing me error that multiple field reference. I am first rotating the images then again taking its property as centroid and orientation has been changed from the original image but its not working.

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KALYAN ACHARJYA 2018-9-18

编辑：KALYAN ACHARJYA 2018-9-18

Have you checked this code with the single image file (remove loop)?

Matt J 2018-9-18

This is showing me error that multiple field reference.

You need to show that error to us, too.

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Answer 1

Saurabh Patel 2018-9-19

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/419625-can-i-use-regionprops-two-times-with-two-different-variables-in-the-same-program-at-time#answer_337395

编辑：Walter Roberson 2018-9-19

在 MATLAB Online 中打开

Probably following lines have error.

circleCenterX = s1.Centroid(1); circleCenterY= s1.Centroid(2);

s1 might be nx1 struct with n greater than 1. My guess is bwareafilt is producing an oversegmented object. You can try the following:

Area = [s1.Area];
index = find(Area==max(Area));
circleCenterX = s1(index).Centroid(1);
circleCenterY=  s1(index).Centroid(2);
diameters = mean([s1(index).MajorAxisLength s1(index).MinorAxisLength],2);

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Saurabh Patel 2018-9-19

I'm not sure what's happening there. regionprops should not return 2x1 struct without any values. If image was empty, it should have returned an empty struct (0x1).

Zara Khan 2018-9-19

Yaa this is happening.For few images I am getting only 2×1 struct only. If I use imcomplement instead of bwareafilt then also I am getting the same thing

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