How to map data using interp1()?

Suppose I have image intensity values at x-axis and the no of pixel repetitions on y-axis then using interp(x,y,xp,'spline') how can I map the data?

[Rik]

Probably related to this question.

Answer 1

[Avinash Bhatt]

I am using the for loop for extracting pixel values and after extraction plotting those values in x-y plane.