magnitude in images

i just calculate the magnitude from the abs value of images.but it returns the large matrix having abs values value.but i want the one magnitude value for the whole images?. i used max function.is it correct?

[Image Analyst]

Are they color or grayscale images? Do you have some formula that defines magnitude for you?

[munch kitty]

color images sir.no formulas sir.simply we calculate abs for given image sir.how to get a single mag for a whole image?

[Walter Roberson]

Based upon the information you have provided, the required outcome is undefined, so you might as well use _any_ magnitude between the minimum and maximum value.

Answer 1

[Walter Roberson]

There are multiple ways of defining the "magnitude from the abs value of images", and using max() is one of the ways. It does not appear to be a common way, but whether it is right or wrong depends upon your needs.

Answer 2

[Rajesh Kumar]

lets say A is an 2dim matrix.. max(A) gives a row matrix with elements as maximums in each column.

>> A= [1 3 5;2 6 7;9 7 2]

   then, max(A)=[9 7 7]

   and then max(max(A))=9

[munch kitty]

i know this. i jst ask whether its correct or not for magnitude calculation us my question?