Extrude multiple rectangles to a specific thickness

Hello All

I used a code to draw rectangle around each brick in the image, as shown in the figure. Now I want to leverage from these rectangles in 3D modeling. So, I want to develope the code to convert each rectangle to object/mesh and extrude them to a specific thickness. Does anyone know how can I do that?

This is the used code:

clc; clear; close;

I = imread ('1.png');

figure, imshow(I);

IBW = imbinarize(rgb2gray(I));

%I2 = imfill(IBW, 'holes');

% figure, imshow (I2);

[L, num ] = bwlabel(IBW);

bboxes = regionprops(L, 'BoundingBox');

figure, imshow(IBW);

hold on

for k=1 : length(bboxes)

curbb = bboxes(k). BoundingBox;

x = rectangle('Position',[curbb(1),curbb(2),curbb(3),curbb(4)], 'EdgeColor','g', 'LineWidth', 1);

end

hold off