How to create a video from grayscale and rgb images?

I have e.g., 20 grayscale frames and 20 RGB color images.

I would like to make a video that has in each frame one grayscale image in the left and one RGB color image in the right.

I am using this code but I get all the frames are black :

vid = VideoWriter(['./video.avi']);
vid.Quality = 100; 
vid.FrameRate = 10;
open(vid);
for i = 1: 20
    imout = [ cat(3,grayImg(:, :,i),grayImg(:, :, i),grayImg(:, :, i)) zeros( size(grayImg,1), 10, 3) (RGBImg(:, :, :,i)) ];

    writeVideo( vid, imout);
end
close(vid);

any help will be appreciated :)

Answer 1

[Image Analyst]

See my attached demos. Part of my ExtractMovieFrames will build a movie from images stored on disk in a folder.

Also look at imtile and montage

[MatlabUser]

thank you so much for replying

[Image Analyst]

grayImg is not defined. You need to define it. And when you do this:

for i = 1: 20
    imout = [ cat(3,grayImg(:, :,i),grayImg(:, :, i),grayImg(:, :, i)) zeros( size(grayImg,1), 10, 3) (RGBImg(:, :, :,i)) ];

you're assuming grayImg will be a hyperspectral image with 20 color channels, which it's not.

[MatlabUser]

actually grayImg is defined to be a 3D array Y,X,number of freames...

so when I use for i=1:20, I am iterating on the frames one by one.

it works fine after rescale the grayscale images to range 0,255 :)

thanks.