How to shift rows in a matrix by consecutive values (e.g row one 0, second row one space, third row two spaces )

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Miguel Reina
Miguel Reina 2017-12-29
评论： Miguel Reina 2018-1-3
I am having trouble with a video and i need to get straight every frame of it. The frames are shifted. Herein the matrix, it contains the RGB components for a frame.

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回答（2 个）

Image Analyst
Image Analyst 2017-12-29
Since the very frist row is the only one that gets overwritten, and the last time it gets overwritten will be the Nth row which gets put into the (N-1)st row (which is again the first row), your final image will be
rgbImage(1, :, :) = rgbImage(end, :, :);
Now, if you had said "second frame gets shifted up 2 lines, third frame gets shifted up 3 lines" then that is a completely different thing that what you asked about only shifting the second row, the third row, etc.
Image Analyst
Image Analyst 2017-12-29
To shear an image sideways, see the help/demo for imwarp():
% Apply Horizontal Shear to Image
% Read grayscale image into workspace and display it.
% I = imread('cameraman.tif');
I = imread('peppers.png');
subplot(1, 2, 1);
imshow(I)
% Create a 2-D geometric transformation object.
tform = affine2d([1 0 0; .5 1 0; 0 0 1])
% Apply the transformation to the image.
J = imwarp(I,tform);
subplot(1, 2, 2);
imshow(J)
% Copyright 2015 The MathWorks, Inc.
Make easy adaptations to shear it the other direction.
  1 个评论
Miguel Reina
Miguel Reina 2018-1-3
This is what i was looking for
id=0:576;
out=cell2mat(arrayfun(@(x) circshift(mat(x,:),[1 id(x)]),(1:numel(id))','un',0));
%mat is the matrix i want to shift and its size is 577 by 721.
thanks anyway

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