This is face morphing. Now I want to save and convert to a gif image format.

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Muhammad Tufail
Muhammad Tufail 2019-9-26
编辑： DGM 2024-9-13
close all
iter=10;
A=im2double(imread('1.JPG'));
B=im2double(imread('2.JPG'));
A=imresize(A, [512 512]);
B=imresize(B, [512 512]);
D=B-A;
D=D./iter;
for i=1:iter
A=A+D;
imshow(A);
pause (0.1);
end

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回答（2 个）

DGM
DGM 2024-9-13
编辑：DGM 2024-9-13
Here:
% inputs
A = imread('tape.png');
B = imread('strawberries.jpg');
% parameters
nframes = 20;
framedelay = 0.1;
ditherstr = 'dither'; % 'dither' or 'nodither'
ncolors = 256; % 2-256
outsize = size(A,1:2); % [y x]
outfile = 'junk.gif';
% cast and resize
A = imresize(im2double(A),outsize);
B = imresize(im2double(B),outsize);
% calculate frame delta
% first frame is unaltered, so the denominator is N-1, not N
D = (B-A)/(nframes-1);
% while gray2ind() exists, it only takes grayscale inputs
% and it can only do uniform quantization. just use rgb2ind().
% expand here so we don't have to do it in the loop
if size(A,3) == 1
A = repmat(A,[1 1 3]);
end
% process and write
for f = 1:nframes
% the first frame is unaltered
if f ~= 1
A = A + D;
end
% convert to indexed
[thisframe thisCT] = rgb2ind(A,min(max(ncolors,2),256),ditherstr);
% write the frame
if f == 1
imwrite(thisframe,thisCT,outfile,'gif','DelayTime',framedelay,'Loopcount',Inf);
else
imwrite(thisframe,thisCT,outfile,'gif','DelayTime',framedelay,'WriteMode','append');
end
end
Or if you're using MIMT and can spare the memory, this is way easier to write.
% inputs
A = imread('tape.png');
B = imread('strawberries.jpg');
% parameters
nframes = 20;
framedelay = 0.1;
ditherstr = 'dither'; % 'dither' or 'nodither'
ncolors = 256; % 2-256
outsize = size(A,1:2); % [y x]
outfile = 'junk.gif';
% cast and resize
A = imresize(im2double(A),outsize);
B = imresize(im2double(B),outsize);
% calculate alpha vector
alpha = permute(linspace(1,0,nframes),[1 3 4 2]);
% construct 4D image
outstack = A.*alpha + B.*(1-alpha);
% write to a GIF
gifwrite(outstack,outfile,framedelay,ditherstr,'ncolors',ncolors) % MIMT-only
Image Analyst
Image Analyst 2024-9-13
That is not face morphing. Morphing is not just a weighted sum of images. The image needs to be warped before adding. So you need to define which points from the first image will be mapped (moved) to which points in the final image. Then intermediate images can have those points moved an interpolated distance. For more info see
https://en.wikipedia.org/wiki/Morphing#Digital_morphing
There are probably File Exhange entries on the topic so you should check those out.
To create a GIF animated file, see the official Mathworks Answer:
https://www.mathworks.com/matlabcentral/answers/94495-how-can-i-create-animated-gif-images-in-matlab?s_tid=srchtitle

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