reflection and absorption coefficient of medical images

I'm new to MATLAB, so pardon me if I've asked you an irrelevant question. I'm looking for some information about digital image analysis. I wonder whether we can extract the reflection and absorption coefficient for a medical image. From a database how can we assume the illumination model?

Answer 1

[KALYAN ACHARJYA]

@Experts Your input is required here!

Hey Jey,

This is a very good question, also hard (for me) to answer, still I am trying....

First Question:

I assumed that you have basic idea about reflection, transmission and absorbtion. When we capture any image using EM ray (illumination), the reflected wave from the illuminated surface detect by photo-diodes (light array sensor in the camera). In medical image aquisation system, uses the different EM ranges, like x-ray, (except utrasound) to capture the different tissue section of the body.

PC:Study{dot}com

The brightness of the image is depends on the reflected illuminated light from the surface, you can calculate the refelection coefficients, if you know incident power and how much reflectes from the surface, please do check Beer's law

But in digital image, the image are already captured, now you have only option to co-relate the brightness of the image (pixels values) to find the refelction and absorption coefficients of the surface. (In this case in image format)

The main question, HOW?

I suggest you to follow the following paper, very good paper

Estimating Surface Reflectance Properties from Images under Unknown Illumination: Link here

Second Question:

From a database how can we assume the illumination model?

Ans: Genarally database provides the details illumination model used to capture the images (Text file)

Hope you get tiny idea!

Good Luck!

[jey mjng]

Thank you Mr.Kalyan. I now got a clear view over the illumination model of digital images.