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How can I solve this - Undefined operator '.^' for input arguments of type 'struct'. ?

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matlab noob
matlab noob 2017-11-25
评论： matlab noob 2017-11-25
clc;
close all;
clear all;
Im = imread('B1_16.tif');
I=rgb2gray(Im);
I=adapthisteq(I);
[row col]=size(I)
double(I);
figure
imshow(I)
% DoG filter (to improve the edge)
sigma = 4;
gauss1 = fspecial('gaussian', round([10*sigma 10*sigma]), sigma);
sigma = 0.1;
gauss2 = fspecial('gaussian', round([10*sigma 10*sigma]), sigma);
blur1 = imfilter(I, gauss1, 'replicate', 'same');
blur2 = imfilter(I, gauss2, 'replicate', 'same');
dog = blur1 - blur2;
figure
imshow(dog)
str = 'Click to select initial contour location. Double-click to confirm and proceed.';
title(str,'Color','b','FontSize',12);
disp(sprintf('\nNote: Click close to object boundaries for more accurate result.'));
% Select region interactively
mask = roipoly;
figure, imshow(mask)
title('Initial MASK');
% Segment the image using active contours
maxIterations = 1; % More iterations may be needed to get accurate segmentation.
bw = activecontour(I, mask, maxIterations, 'Chan-Vese');
% Display segmented image
figure, imshow(bw)
title('Segmented Image');
% find the features of the segmented area using function
g=regionprops(bw,'all')
% finding the area of the white area segmented from the previous images
% area is the number of white pixel in the image
numofpixels=sum(bw(:))% correct (num of pixels indicates the area of the segmented image)
% numofpixels1=sum(I(:)) just to confirm that the algorithm used is
% correct
% measure the perimeter
Perimeter=regionprops(bw,'perimeter')
% determine the circularities
Circularities=Perimeter.^2/(4*pi*numofpixels)
%perimeter
pm=bwperim(bw,8)
red=Im(:,:,1);
green=Im(:,:,2);
blue=Im(:,:,3);
red(pm)=255;
green(pm)=255;
blue(pm)=0;
out=cat(3,red,green,blue);
figure
imshow(pm)
figure
imshow(out)

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采纳的回答

Walter Roberson
Walter Roberson 2017-11-25
Change
Perimeter=regionprops(bw,'perimeter')
to
rinfo = regionprops(bw,'perimeter');
Perimeter = [rinfo.Perimeter];
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Walter Roberson
Walter Roberson 2017-11-25
regionprops will return a structure array with one element for each region found. You asked for perimeter so there will be one field, rinfo(1).Perimeter, rinfo(2).Perimeter and so on existing
When you name a structure array and a field, rinfo.Perimeter, then MATLAB converts that into a comma separated list, as if you had written rinfo(1).Perimeter, rinfo(2).Perimeter and so on at that point. With [] there, that becomes
Perimeter = [rinfo(1).Perimeter, rinfo(2).Perimeter, ....]
which is the horizontal concatenation of the Perimeter values for all of the elements. The effect is the same as
for K = 1 : length(rinfo)
Perimeter(K) = rinfo(K).Perimeter;
end
since all of the items are scalar.

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