Spatial interpolation between two images/frames.
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Ivan Shorokhov
on 8 Feb 2016
Commented: Image Analyst
on 8 Feb 2016
Hello everybody,
[Wanted]: I want to estimate (interpolate) middle image between two frames in 'xylophone.mp4', for example I would like to to estimate new frame between existing frames 4 and 6.
[What has been done so far]: Here is what I have done so far:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/154377/image.jpeg)
close all; clear all; clc;
vidObj = VideoReader('xylophone.mp4');
vidHeight = vidObj.Height;
vidWidth = vidObj.Width;
s = struct('cdata',zeros(vidHeight,vidWidth,3,'uint8'),...
'colormap',[]);
k = 1;
while hasFrame(vidObj)
s(k).cdata = readFrame(vidObj);
k = k+1;
end
figure(1);
subplot(1,2,1);imshow(s(4).cdata); title('4th frame');
subplot(1,2,2);imshow(s(6).cdata); title('6th frame');
im1=s(4).cdata;im2=s(6).cdata; t=0.5;
imnew = (1-t)*im1 + t*im2; % linear combination of them.
figure(2);
subplot(1,2,1); imshow(s(5).cdata); title('5th frame');
subplot(1,2,2); imshow(imnew); title('5th frame');
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/154379/image.jpeg)
[Need help with]
- Estimate/interpolate image between frame 4 and 6, using following methods: 'nearest','cubic','spline','linear'.
I'm not sure what function should I use ... interp2 or interp3 and how to use it. I have tried to use Vq = interp2(im1,im2,'nearest'); but I got an error, so that is no the way how it should be used.
Thanks in advance for any help (@Image Analyst),
Ivan
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Accepted Answer
Image Analyst
on 8 Feb 2016
I don't know about interp3 - I haven't used it. interp2() required 2D images so to use that you'd use it on each color channel one at a time. It will basically give you the average of the images so you'd have two hands in it, like you have but each would be blended with the background. You would not get one hand in between the two hand positions. There might be algorithms for that, but I don't know what they are.
4 Comments
Image Analyst
on 8 Feb 2016
Perhaps. I have never looked at that function. Maybe you can ask the author.
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