How can I separate a section of a graph with high values or Energy?

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Kian Azami 2017-9-8

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评论： KSSV 2017-9-11

In the image that I have attached to this question I would like to write a code to separate the values between the two data cursor from the rest of the data. How can I do that?

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KSSV 2017-9-8

You have both x and y data to plot or you have plotted only y w.r.t indices.

Kian Azami 2017-9-11

编辑：Kian Azami 2017-9-11

I have only y with respect to the indices. However I can have the values of x which is not very important for me. The y is the intensity of each pixel color, and the x is the pixels positions. Therefore values of y with high intensity is the position where my image occurs and I want to separate it from the rest of the image.

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KSSV 2017-9-8

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If you have only y and plotting wrt indices then:

iwantx=416:1188;
iwant=y(I want);

If you have both x and y data.

iwantx=x(x>=416 & x<=1188) ;
iwanty=y(x>=416 & x<=1188) ;

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Kian Azami 2017-9-11

This can be a good Idea! However sometimes there are noises that goes beyond that threshold but they are thin respect to the interested area. Maybe I can put a threshold and then I should put another condition with respect to the width?