Image conversion

How to convert a binary matrix into RGB image?

Answer 1

[Image Analyst]

rgbImage = uint8(cat(3, binaryImage, binaryImage, binaryImage));

[Jamuna Jayashri Mahalingam]

I implemented the code..But what I am getting is a black block..What might be wrong?

[Image Analyst]

Set a breakpoint right after that line, and issue these commands.

class(binaryImage) % Or whatever name you're using.

max(binaryImage(:)) % Note: no semicolons

min(binaryImage(:))

class(rgbImage)

max(rgbImage(:)) % Note: no semicolons

min(rgbImage(:))

What does it say?

Can you try showing it like this:

imshow(rgbImage);

Why do you want an RGB image anyway? If it's made from a binary image it will be just pure black and pure white anyway, just like your binary image looked like. It's not going to magically add a rainbow of colors to it simply by concatenating to convert into a 3D true color RGB image.

[Jamuna Jayashri Mahalingam]

I tried combining with VHDL to reconstruct a colour image. That is why I wanted RGB image. Is there any other way for this conversion?

[Image Analyst]

Well you could use ind2rgb() but you'd need to pass in a colormap. But why? Was the cat(3,) method not workable for some reason?

[Jamuna Jayashri Mahalingam]

yeas, the cat(3) method wasnt working.

[Image Analyst]

What was your exact line? Because I know it works since I've been doing it that way for years.

[Jamuna Jayashri Mahalingam]

RGB=uint8(cat(3,y,y,y));

y is the binary image