MATLAB: How to add box to an image

box around imageframeImage Processing Toolboximshowrectangle

I have two images ('yellow.png' and 'bird.png'). See below.

How can I make a box AROUND the image borders with self-defined box colours, say all four lines with grey colour [0.5 0.5 0.5]?

See below.

Please can you help?

Best Answer

If the bad lines are always the rightmost one and the bottom one, you can simply crop the image to not include those:

rgbImage = rgbImage(1:end-1, 1:end-1, :);

To pad the image with certain color, you can use padarray() on each color channel. There are other ways. Let me know if it's still a problem for you.

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MATLAB: How to save the image WITHOUT the white background using imwrite (advanced problem)

Try this:

% To burn the color into the image itself.
[rows, columns, numberOfCOlorChannels] = size(RGB)
RGB(:, 1, 1:3) = repmat([255, 0, 0], rows, 1);
RGB(:, end, 1:3) = repmat([255, 0, 0], rows, 1);
RGB(1, :, 1:3) = repmat([255, 0, 0], columns, 1);
RGB(end, :, 1:3) = repmat([255, 0, 0], columns, 1);
imshow(RGB);
imwrite(RGB, filename);

It's much more robust than saving the bitmap in the overlay, which is subject to change whenever you resize the figure window.

MATLAB: Cropping out two images from one big image by manually selecting the cropping are

Try this code

img = imread('pears.png');
figure();
ax1 = axes();
imshow(img, 'Parent', ax1)
fprintf('Drag a rectange on the image.\n')
roi = drawrectangle(ax1);
img_small = imcrop(img, roi.Position);
figure();
ax2 = axes();
imshow(img_small, 'Parent', ax2)

Best Answer

Related Solutions

MATLAB: How to save the image WITHOUT the white background using imwrite (advanced problem)

MATLAB: Cropping out two images from one big image by manually selecting the cropping are

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