struck with this code

Hi,

I need to know , how this code is working

windowSize = 8; 
 Filter = filter(ones(1,windowSize)/windowSize,1,cog(:)); 
 cog1 = Filter (10:end,:);

Can any one explain me about this code

Thanks in advance

Answer 1

[Guilherme]

Hello

You are basically filtering the data from the "cog" vector using a Digital Filter, which is done with the command:

Filter = filter(ones(1,windowSize)/windowSize,1,cog(:));

In this case, the filter in question is a FIR with the coefficients specified from the command :

ones(1,windowSize)/windowSize

The last command just copies a part from the filtered data into another vector (starting from 10 to the end). You can read more about FIR filters on http://en.wikipedia.org/wiki/Finite_impulse_response if you have any question about them. You can also check each command's help on MATLAB, they are very useful and well-described. Try:

help fitler
help ones

Answer 2

[Image Analyst]

It blurs the image in a sliding 8 element wide box. The "cog" image will be blurred horizontally only, not vertically. Then you are extracting the top 10 rows of the blurred image into another image called cog1.