How can i get an depth matrix using a depth map in MATLAB?

I am working on an project of depth estimation of monocular image using neural networks . But I am facing a problem in visualizing the depth matrix (Value of depth in meters). How can i use Matlab to get these values?

[Jan]

The detail does not matter, where the matrix is coming from. But it matters, how you want to visualize the data. What exactly do you want to "get"?

[Vishesh Breja]

I have a depth map(like an attached one),i want to visualize the matrix form because i want to have the depth value (in mm or other measurement ) to calculate the blur radius size and then do further operations using this information. I have no idea how can i get the the depth data or depth matrix from this kind of depth map image. Thank you for your help in advance.