Register high resolution images using geometric transform obtained from same images of low resolution.

So I have registered two images perfectly and used imwarp to get it in its RGB format.These are low resolution images (456*417*3) uint8 and both have same size.

Now the problem arises when I try to use the tform (geometric transformation)obtained by these two low resolution images and I pass that in imwarp function to align the high resolution or scaled up version of the same two images(size 7425x6657x3) uint8.They remain misaligned when I view them using imshowpair and scaling property.

IM1 and IM2 are low resolution images and IM11 and IM22 are high resolution images.

I am using this method to reduce my computation time as registering the high resolution image takes a lot of time.So registering at low resolution and applying that transform to high resolution using imwarp should I guess take less computation time.

Here is my code.

function [ M_Reg Reg_IM1 ,movingRegistered]=fun_Register(IM1,IM2,IM11,IM22) % function [M_Reg Reg_IM1 movingRegistered]=fun_Register(IM1,IM2) Reg_IM1=rgb2gray(IM1); Reg_IM2=rgb2gray(IM2); figure, imshowpair(Reg_IM1,Reg_IM2,'ColorChannels',[1 2 0])

%% Define Optimizer and Metric parameters

optimizer = registration.optimizer.OnePlusOneEvolutionary; metric = registration.metric.MeanSquares;

%%Tuning optimizer parameters to improve registration effiency optimizer.InitialRadius=0.0001; optimizer.MaximumIterations = 1000;

%%Registration using Similarity value M_Reg = imregister(Reg_IM2,Reg_IM1, 'affine', optimizer, metric,'DisplayOptimization',true); figure,imshowpair(Reg_IM1,M_Reg, 'Scaling','joint');title('Final registered diffrence')

%%Estimate geometric transformation that aligns two tform = imregtform(Reg_IM2,Reg_IM1,'affine',optimizer,metric);

%%Apply geometric transformation to image movingRegistered = imwarp(IM22,tform,'OutputView',imref2d(size(IM11)));

%Display results

 figure,imshow(movingRegistered);title('Registered Image High Resolution')
  figure,imshowpair(IM11,movingRegistered, 'Scaling','joint');title('Final registered 1')

Any help will be deeply appreciated!!

[Nick]

Hi Saurabh,

Did you find a solution to your problem?

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