How can I get the intensity of individual pixel and average intensity of all from a given image

I've taken a time lapsed image of mixing process of blue & yellow dyes already. Mixing indices are computed using intensities of pixels across a cross section of a gray-scale image that delineates a mixing event. I have a mathmatical model to find the relative mixing index (RMI) and absolute mixing index (AMI), which requires local pixel intensity and average of the pixel intensities in the cross section. Can you help me how to get these intesity values using MATLAB please?

Answer 1

[KALYAN ACHARJYA]

"How can I get the intensity of individual pixel and average intensity of all from a given image"

"get the intensity of individual pixel" Fun: imread

Load or read an image on Matlab (matrix form), individual matrix elements represents the intensity value of individual pixels.

"average intensity of all from a given image"

Find mean of the image matrix (or variable), you will get the mean intensity value of a given image.