How do I generate .mat database for my own image set?

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Vivek Agrawal on 23 Jul 2015

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https://www.mathworks.com/matlabcentral/answers/230952-how-do-i-generate-mat-database-for-my-own-image-set

How do I train images and make a .mat file? I am trying the following simple matlab program :

http://in.mathworks.com/matlabcentral/fileexchange/22030-image-retrieval-query-by-example-demo

Documentation https://ece.uwaterloo.ca/~nnikvand/Coderep/imQuery/documentation.html

Now, this zip package already includes a .mat file which has histograms of all the sample images provided for querying.I want to query over my own sample-set of images.

I figured out that I need that getimagehist function to calculate the histogram and populate a database of my images in .mat format. but how exactly do i do it? I am a newbie in matlab that's why i have no idea. A working code for generating .mat file for my own images would be greatly appreciated.