How to associate a rectangle with a struct?
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Hi there Community,
I have the folllowing image and the antenna:
[Horizontal,Vertical,Optional] = msiread(strcat(pathName,fileName));
How can I associate a rectangle to an antenna?
I made the rectangle using:
rectangle('Position', [(x - handles.Rwidth/2) (y - handles.Rwidth/2)...
handles.Rwidth handles.Rheight], 'FaceColor', 'g','LineStyle', 'none');
Is it possible to affect the rectangule with the struct (antenna)?
10 个评论
Walter Roberson
2020-8-5
Could you explain more what you mean by "associate" ?
Are you asking for some image processing to locate the yellow blobs, calculate the centroids, and then use those centroids as the locations to place antennae ?
Adam Danz
2020-8-5
My guess is that you want to change the position of the rectangle according to some other object on the plot. Changing the position of an existing rectangle can be done by changing its position property.
h = rectangle('Position', [1 2 3 4]);
% change position
h.Position = [2 3 4 5];
Walter Roberson
2020-8-5
I see that you edited your question, but unfortunately I do not know what you mean by "affect the rectangle with the struct (antenna)" ??
Oliver Lestrange
2020-8-6
Walter Roberson
2020-8-6
Are you asking for some image processing to locate the yellow blobs, calculate the centroids, and then use those centroids as the locations to place antennae ?
Oliver Lestrange
2020-8-6
Adam Danz
2020-8-6
If you plotted the yellow squares, then you know their positions. Use the positions to keep track of where the yellow squares are. The problem is still not clear.
Oliver Lestrange
2020-8-6
Maybe with this image is more easy to explain.
Imagine that I read this image. Now, I need to know, or put, the antennas in the yellow thing called BTS_xx, in order to calculate the coverage.
Adam Danz
2020-8-6
Oliver Lestrange
2020-8-6
采纳的回答
Walter Roberson
2020-8-6
rgb = imread(filename) ;
mask = rgb(:, 1) < 32 & rgb(:, 2) > 224 & rgb(:, 3) > 224;
mask = bwareafilt(mask, [50 inf]);
props = regionprops(mask, 'centroid') ;
locations = vertcat(props.Centroid);
The constants in the above are not tested, only "by eye", and probably need to be adjusted.
The resulting variable will be a something by 2 array in which the first column is x and the second is y. Note that x corresponds to columns, second array index, and y corresponds to row, first index.
4 个评论
Oliver Lestrange
2020-8-6
Walter Roberson
2020-8-6
It detects bright yellow. Yellow has little red component but bright yellow has strong blue and green components.
Oliver Lestrange
2020-8-7
Walter Roberson
2020-8-7
Looks like I should have used
mask = rgb(:, :, 1) > 224 & rgb(:, :, 2) > 224 & rgb(:, :, 3) < 32;
as I was mistaken about the composition of yellow in RGB.
filename = 'image.png';
rgb = imread(filename) ;
mask = rgb(:, :, 1) > 200 & rgb(:, :, 2) > 200 & rgb(:, :, 3) < 32;
maskfilt = bwareafilt(mask, [50 inf]);
props = regionprops(maskfilt, 'centroid') ;
locations = vertcat(props.Centroid);
imshow(rgb)
hold on
scatter(locations(:,1), locations(:,2), 'r*')
hold off
The 32 and 224 came from my experience with RGB colors.
Your yellow blobs appear to be approximately "dark yellow 1". You can tell the values by imshow(rgb) and using the data cursor tool to read RGB values off of the image.
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