Sparse based image processing

Hello everyone.Kindly suggest me a good source from where I can learn to write matlab Code for sparse based image processing ,dictionary learning etc. I am a newcomer in this field so I also need to learn the underlying theory of sparse based image processing,dictionary learning in a lucid manner.Professor M Elad book is very good but it is too hard to begin with.I need some easy book which is written in an easy way.From the basic to the advanced one. Please help me. Thank you.

Answer 1

[Walter Roberson]

nnz(TheArray)/numel(TheArray)

gives the fraction that is filled. (Fraction, not percentage)

[Arghya Pathak]

Anyone please answer my question. I didn't get any relevant answer of my question.

[Walter Roberson]

You edited away the part of the question that I responded to.

I do not have any references to give on the remaining topics.

[Arghya Pathak]

Actually my fundamental query is how to learn sparse based image processing , dictionary learning and to write matlab codes for the different applications. I am new in this field and didn't find any suitable source to learn the concept clearly.Sorry for the inconvenience. Thank you for answering previous question.