zeros(8,m,n) for a 3d image, what does 8 specify here?.

i have used this coding for an image..i am unable to understand as to why 8 has been used here?

Answer 1

[Azzi Abdelmalek]

Look at http://www.mathworks.com/products/matlab/examples.html?file=/products/demos/shipping/matlab/nddemo.html#1

Answer 2

[Image Analyst]

8 is the number of rows (the "Y" dimension).

m is the number of columns (the "X" dimension).

n is the number of color channels (typically 1 for grayscale or 3 for RGB true color or some other color space such as HSV or LAB). Sometimes thought of as the "Z" dimension.

So you have a multispectral image. Each color channel of that multispectral image is an 8 by m 2D image, and you have n of them (one for each wavelength range, color channel). Though in your case everything is zero, so maybe you're just initializing and pre-allocating space.