Bounding box width and Y coordinate in image processing

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Soul Keeper
Soul Keeper 2016-3-14
评论： Soul Keeper 2016-3-14
Hi there can someone help with something...
I need to dete
ct the width of an object surrounded by a bounding box. I have the centroid for it and i need to calculate at first the distance between the centroid and the left side of the box(and put this in a variable); and then the width between the centroid and the right hand side of the box(a new variable). after that i can calculate the width of the whole object buy doing a sum between both variables. i need to do it this way - don't ask why cuz I don't know either. I have attached a photo maybe you will understand better
this is what i have so far in terms of coding
prop = regionprops(imgFill);
hold on
for n=1:length(prop)
rectangle('Position',prop(n).BoundingBox,'EdgeColor','b','LineWidth',2);
x = prop(n).Centroid(1);
y = prop(n).Centroid(2);
plot(x,y);
end
hold off

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Image Analyst
Image Analyst 2016-3-14
Try this:
props = regionprops(imgFill, 'Centroid', 'BoundingBox');
hold on
for k=1:length(props)
thisCentroid = props(k).Centroid;
thisBoundingBox = props(k).BoundingBox;
rectangle('Position',props(k).BoundingBox,'EdgeColor','b','LineWidth',2);
x = prop(k).Centroid(1);
y = prop(k).Centroid(2);
plot(x, y, 'r+', 'MarkerSize', 13, 'LineWidth', 2);
% Find the left edge and right edge of the bounding box.
leftColumn = thisBoundingBox(1) + 0.5;
rightColumn = thisBoundingBox(1) - 0.5;
% Find the distance of them to the centroid.
leftDistance(k) = x - leftColumn
rightDistance(k) = rightColumn - x
% Plot a line between them
line([leftColumn, rightColumn], [y, y], 'Color', 'g');
end
hold off
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Soul Keeper
Soul Keeper 2016-3-14
sorry my bad this is what i did
topDistance(k) = y - topRow;
botDistance(k) = -(bottomRow - y);
[max_num_top, max_idx_top]=max(topDistance(:));
[max_num_bot, max_idx_bot]=max(botDistance(:));
max_num_top
max_num_bot
it gives me the right value. i've got confused with something - don't know what either :-/
Soul Keeper
Soul Keeper 2016-3-14
anyway.. i wanted to say .. sir.. you are a star! thank you so much!

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