How to draw represent connected components bounding boxes with different color??

I'm working on handwritten documents,so I want to show bounding boxes of different line with different color. I've a matrix which contains the connected components values and I want to color bounding boxes using this color.

[Walter Roberson]

How are you drawing the bounding boxes at present?

[IP student ;(]

Using regionprops ()

[Walter Roberson]

regionprops() finds bounding boxes but does not draw them.

[IP student ;(]

Sorry,I used rectangle to draw bounding boxes

Answer 1

[Image Analyst]

Use plot(xBox, yBox, 'Color', yourColor), or rectangle('Position', bb, 'EdgeColor', yourColor) or something like that. xBox is obtained from the bounding box like

props = regionprops(binaryImage, 'BoundingBox');
for k = 1 : length(props)
    bb = props(k).BoundingBox);
    xBox = [bb(1), bb(1)+bb(3), bb(1)+bb(3), bb(1), bb(1)];
    yBox = [bb(2), bb(2), bb(2)+bb(4), bb(2)+bb(4), bb(2)];
    plot(xBox, yBox, 'Color', rand(1,3));
    hold on;
end

If you still can't figure it out, write back.

[IP student ;(]

I've a matrix A1 ,which contains the values of dy which are less than 30. Now I want to draw bounding box for A1 values. In simple I want to represent connected components in different color (different color bounding boxes)

[Image Analyst]

I'm not seeing a question anymore so I guess you got it solved.

I don't know what A1 or dy is, but my code will draw bounding boxes of blobs in different colors.

[IP student ;(]

Dy is the difference of y.

[IP student ;(]

I tried your code I'm getting a graph with different colored boxes of different sizes.

I want the bounding boxes around my texts and I've that already. Now I want to have different color bounding boxes for selected connected components

[Image Analyst]

Yes, my code should do that assuming you have rows and columns for where you want to put the boxes.

Again, I don't see a question in your comment (i.e. a sentence ending with a question mark), but if you want to colorize blobs, use label2rgb(). Then you can make each box have the same color as the blob if you want to.