How to overlay an image on a surface plot?

I have the following surface plot (x axis represents x coordinates, y axis represents y coordinates all in pixels), colormap represents time from 0 to 500 ms.

And I would like to overlay the plot on an image that is 198 x 251 pixels placed in the center of the plot (i.e 960, 540).

How could I do so?

Thanks.

[cui,xingxing]

Maybe you can refer to the "warp" built-in function that displays the image on the surf.

Answer 1

[Image Analyst]

See attached demo for how to overlay a color image on a surface plot of a gray scale image. Adapt as needed.

% Demo to create a surface from a gray scale image and have the coloration of the surface taken from a different RGB image.
clc;    % Clear the command window.
clear all;
close all;
workspace;  % Make sure the workspace panel is showing.
format short g;
format compact;
fontSize = 15;
fprintf('Beginning to run %s.m ...\n', mfilename);

%===============================================================================
% Get the name of the demo image the user wants to use.
% Let's let the user select from a list of all the demo images that ship with the Image Processing Toolbox.
folder = fileparts(which('cameraman.tif')); % Determine where demo folder is (works with all versions).
% Demo images have extensions of TIF, PNG, and JPG.  Get a list of all of them.
imageFiles = [dir(fullfile(folder,'*.TIF')); dir(fullfile(folder,'*.PNG')); dir(fullfile(folder,'*.jpg'))];
for k = 1 : length(imageFiles)
    % 	fprintf('%d: %s\n', k, files(k).name);
    [~, baseFileName, extension] = fileparts(imageFiles(k).name);
    ca{k} = [baseFileName, extension];
end
% Sort the base file names alphabetically.
[ca, sortOrder] = sort(ca);
imageFiles = imageFiles(sortOrder);
button = menu('Use which gray scale demo image?', ca); % Display all image file names in a popup menu.
% Get the base filename.
baseFileName = imageFiles(button).name; % Assign the one on the button that they clicked on.
% Get the full filename, with path prepended.
fullFileName = fullfile(folder, baseFileName);
% img = imread('pears.png');

rgbImage = imread(fullFileName);
[rows, colummns, numberOfColorChannels] = size(rgbImage)
subplot(2, 2, 1);
imshow(rgbImage);
axis('on', 'image');
impixelinfo; % Let user mouse around and get RGB or gray levels.
caption = sprintf('Original Image : %s', baseFileName);
title(caption, 'FontSize', fontSize);

% Make gray scale value image.
peaksImage = flipud(peaks(100));
subplot(2, 2, 3);
imshow(peaksImage, []);
axis('on', 'image');
impixelinfo; % Let user mouse around and get RGB or gray levels.
title('Gray Scale Image of Z Values: Peaks(100)', 'FontSize', fontSize);
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);

% Apply the RGB image as a texture to the surface.
subplot(2, 2, [2,4]);
surf(peaksImage, ...
    'FaceColor', 'texturemap',...
    'EdgeColor', 'none',...
    'Cdata', rgbImage);
view(3);
axis ij;
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
zlabel('Z', 'FontSize', fontSize);
if numberOfColorChannels == 1
    colorbar;
end
title('Peaks Image with "Original" Image Applied as a "texturemap"', 'FontSize', fontSize);
g = gcf;
g.WindowState = 'maximized'