problem in understanding ''Feature Based Panoramic Image Stitching ''

I'm on studying the ''Feature Based Panoramic Image Stitching '' and I have 5 questions

the link: https://www.mathworks.com/help/vision/examples/feature-based-panoramic-image-stitching.html#zmw57dd0e3712

1.how should I fill these 2 lines if my images are in the folder on my pc

buildingDir = fullfile(toolboxdir('vision'), 'visiondata', 'building');
buildingScene = imageDatastore(buildingDir);

2.why we use eye(3) for projective2d ?

3.in match features, what is the role of 'unique'?

4.in tforms(n).T , what do we mean by <.T> ?

5. what is the role of step and imref2d in this code?

tnx

Answer 1

[Walter Roberson]

1) You do not need to change those lines provided you have a version of the Computer Vision Toolbox installed that is new enough to have the files.

[alireza kooshafar]

tnx but i want to understand the code and use my images

[Walter Roberson]

Then replace

buildingDir = fullfile(toolboxdir('vision'), 'visiondata', 'building');

with assigning to buildingDir the string which is the name of the directory where your files are. For example,

buildingDir = 'C:\Users\Kooshafar\Documents and Settings\MATLAB\Project17\buildings';

[Jagrati Talreja]

if I have to take the difference of the two images after alignment