calculate HPBW of given picture?

Question

M. Khishe 2012-9-21

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/48719-calculate-hpbw-of-given-picture

this code calculate HPBW of produce image with matlab( peaks order)

clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
workspace;  % Make sure the workspace panel is showing.
fontSize = 20;
% Create sample data.
H = peaks(90);
H = 11*mat2gray(H) - 13;
% Display it.
subplot(2, 2, 1);
surf(H);
xlabel('Azimuth [deg]', 'FontSize', fontSize);
ylabel('Elevation [deg]', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]); % Maximize figure.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off') 
% Threshold the image
binaryImage = H > -3;
% Display it.
subplot(2, 2, 2);
imshow(binaryImage);
axis on;
xlabel('Azimuth [deg]', 'FontSize', fontSize);
ylabel('Elevation [deg]', 'FontSize', fontSize);
measurements = regionprops(binaryImage, 'BoundingBox');
bb = [measurements.BoundingBox]
x1 = bb(1);
x2 = x1 + bb(3);
y1 = bb(2);
y2 = y1 + bb(4);
% Plot box over image.
hold on;
plot([x1 x2 x2 x1 x1], [y1 y1 y2 y2 y1], 'r-', 'LineWidth', 2);
message = sprintf('The Azimuth Width at -3 dB = %.1f\nThe Elevation Width at -3 dB = %.1f', ...
    bb(3), bb(4));
msgbox(message);

how can i run it for my image that linked below?

http://kmu.site40.net/images/19d3c9e40467.jpg

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M. Khishe 2012-9-22

no half power beam width

Image Analyst 2012-9-23

And are you now done with this? Because you didn't answer his other question way down at the bottom where he commented on your Answer. Walter and I are basically saying the same thing. You must have data to work with, not some pretty visualization.

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Answer 1

Image Analyst 2012-9-21

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/48719-calculate-hpbw-of-given-picture#answer_59566

You can't run it on that picture. You'd need the underlying data that was rendered in that visualization.

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Walter Roberson 2012-9-21

Calculate it on your "H" instead.

Image Analyst 2012-9-21

编辑：Image Analyst 2012-9-21

I have no idea but I know you need it to work on your actual data than some pretty picture of your actual data that was rendered all fancy in some kind of 3D-like chart or perspective picture.

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