i need to add an image as background?
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marc kahwaji
am 4 Aug. 2014
Kommentiert: marc kahwaji
am 12 Aug. 2014
here is my code
close all; clear all;
P = @(x,y,c,w,a) a.*exp(-((x-repmat(c(1),size(x,1),size(x,2))).^2 + (y-repmat(c(2),size(y,1),size(y,2))).^2)./w); A=[6 8 10]; W = 1; % Width (constant here, can vary as a vector if you like) C = [[18 15 5];[10 10 10]]; % Peak centers x = linspace(0,20,150); % Define ‘x’ vector
[X,Y] = meshgrid(x); pks = zeros(size(X)); % Preallocate ‘pks’ for k1 = 1:size(C,2) % Loop through ‘C’ (centers) vector pks = pks + P(X,Y,C(:,k1),W,A(k1)) ; end
A=meshz(X,Y,pks); view(2);
grid on;
colorbar
i have this code and i need to add an image as a background how can i do it?
Akzeptierte Antwort
Image Analyst
am 5 Aug. 2014
Try this:
clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
imtool close all; % Close all imtool figures if you have the Image Processing Toolbox.
clear; % Erase all existing variables. Or clearvars if you want.
workspace; % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 13;
close all;
clear all;
P = @(x,y,c,w,a) a.*exp(-((x-repmat(c(1),size(x,1),size(x,2))).^2 + (y-repmat(c(2),size(y,1),size(y,2))).^2)./w);
A=[6 8 10];
W = 1; % Width (constant here, can vary as a vector if you like)
C = [[18 15 5];[10 10 10]]; % Peak centers
x = linspace(0,20,150); % Define ‘x’ vector
[X,Y] = meshgrid(x);
pks = zeros(size(X)); % Preallocate ‘pks’
for k1 = 1:size(C,2) % Loop through ‘C’ (centers) vector
pks = pks + P(X,Y,C(:,k1),W,A(k1)) ;
end
subplot(1,3,1);
imshow(pks);
grid on;
colorbar
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Read in background image.
backgroundImage = imread('cameraman.tif');
% Make same size as pks.
backgroundImage = double(imresize(backgroundImage, size(pks)));
% Normalize
backgroundImage = backgroundImage * max(pks(:)) / max(backgroundImage(:));
subplot(1,3,2);
imshow(backgroundImage, []);
axis on;
compositeImage = backgroundImage; % Initialize.
% Get location of circles.
circleLocations = pks > 0.001;
% Now add circles.
compositeImage(circleLocations) = pks(circleLocations);
subplot(1,3, 3);
imshow(compositeImage, []);
axis on;
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/175349/image.jpeg)
13 Kommentare
Image Analyst
am 12 Aug. 2014
numel() is the number of pixels in the image. weight says how much wieght to apply to one image. The other line just does the weighted sum. It just says how much of one image shows in comparison to the other image. Not sure how to describe weighted sum. I thought everyone knew what it was. Perhaps you can Google it.
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