How can I inderstand the mathematical formula in local descriptors?

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Assma Azeroual Popular answer

Maybe, you should start by reading "Digital Image Processing" book of Gonzalez and try to learn more about mathematics especially algebra. This will help you to understand this kind of algorithms.

Assma Azeroual

Could you please put the formula that you didn't understand?

Hadjer Lacheheb

let us take harris detector

Bruno Martin

I'm sure you could "google" to find some tutorials and explanations probably clearer than what you would get from such a fuzzy question on this site. Please, come back with something more specific.

P.S.: If you don't already know what is a Harris corner detector, there is no way to learn it from the simple image you posted. Only by looking on Wikipedia would probably give you way more information and links to pertinent information than what you posted.

thank you asma for your help