draw bounding box around a character

Question

Elysi Cochin 2020-5-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/531958-draw-bounding-box-around-a-character

评论： Elysi Cochin 2020-5-25

采纳的回答： Image Analyst

The code i used is

Ch = bw(boundrow(1):boundrow(end),boundcol(1):boundcol(end));

i'll get the character into the variable Ch

how can i draw a bounding box in the image

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Answer 1

Image Analyst 2020-5-24

1
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https://ww2.mathworks.cn/matlabcentral/answers/531958-draw-bounding-box-around-a-character#answer_437583

Presumably you used regionprops()

props = regionprops(binaryImage, 'BoundingBox');
% Plot all the bounding boxes.
hold on;
for k = 1 : length(props)
    rectangle('Position', props(k).BoundingBox, 'EdgeColor', 'y');
end

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Image Analyst 2020-5-24

I would not do it that way, but if you insist, after you get Ch you can put a box around the rectangle in the original image like this:

line([boundcol(1), boundcol(end)], [boundrow(1), boundrow(1), 'Color', 'y', 'LineWidth', 2);
line([boundcol(1), boundcol(end)], [boundrow(end), boundrow(end), 'Color', 'y', 'LineWidth', 2);
line([boundcol(1), boundcol(1)], [boundrow(1), boundrow(end), 'Color', 'y', 'LineWidth', 2);
line([boundcol(end), boundcol(end)], [boundrow(1), boundrow(end), 'Color', 'y', 'LineWidth', 2);

or

% Make rect = [xLeft, yTop, width, height]
r = [boundcol(1),  boundrow(1), abs(boundcol(end) - boundcol(1)),  abs(boundrow(end) - boundrow(1))];
rectangle('Position', r, 'EdgeColor', 'y', 'LineWidth', 2);