Effect of a translation on cross correlation

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emar 2017-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/345952-effect-of-a-translation-on-cross-correlation

编辑： emar 2017-6-23

Hello,

To find displacement of a particle, I calculated the cross correlation between two instants (represented by two images with the same size). Then, I padded the images with zeros to see if a translation will have an effect on the displacement. Thus I found a difference in displacement vector( the difference can reach 1.5 pixel and the size of image is 56x56 pixels)

Is it normal to find a difference after padding?

N.B: To pad the image, I used

new_image(end+1:56,end+1:56)=0;

Thank you in advance

EDIT

The difference can even be more (22 px)