How to choose a spectra (given observed single [x,y] value) that matches with one of spectra from several spectra (given as several [x,y] points) ?

How to choose a spectra (given observed single [x,y] value) that matches with one of spectra from several spectra (given as several [x,y] points) ?

Answer 1

[Image Analyst]

You could use the sum of absolute differences or the RMS difference or PSNR.

[RS]

I am having observed [x,y] in the form of plot not image, please for that what to do?

[Image Analyst]

Just use the y values.