Dot indexing is not supported for variables of this type - ISSUE?

Here is the screenshot. What is the problem here? Yesterday I was able to access the Data field in the Command Window with the code line in the screenshot.

Is it a common problem, or there is a problem in my script?

Thank you.

[Cris LaPierre]

There error means sub is not a structure. The code we can see is fine, There may be an issue with how you set up your ros environment. Can you share all your code?

[L]

Thank you. I have solved it using the receive() function. Now it works without error.

Stil, I have problem with the conversion from BGRA8 to RGB after I have received the BGRA8 image as 1010688x1 uint8 vector. Here is the code, where the img is the 1010688x1 vector of BGRA8 data:

outImg = reshape(img, [376 672 4]);

rgb=outImg1(:,:,[3 2 1]);

and the screenshot too.

[Cris LaPierre]

What is the issue?

For those of us who do not have BGRA8 images, can you save one to a mat file and attach it to your post using the paperclip icon?

[Cam Salzberger]

I've answered the image conversion from ROS message to image array in your other question:

https://www.mathworks.com/matlabcentral/answers/1562286-convert-bgra8-image-format-to-rgb-format#answer_808076

[L]

Thank you, I have solved the problem.

Answer 1

[Jan]

Start with experimenting:

img2 = reshape(img, [4, 376, 672]);
rgb  = permute(img2([3 2 1], :, :), [2, 3, 1]);
figure, image(rgb);

This is called "gunshot programming" and an anti-pattern. But if it works...

[L]

Thank's. now it works