struck with this code

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Jim
Jim 2012-6-8
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

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回答（2 个）

Guilherme
Guilherme 2012-6-8
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
Image Analyst
Image Analyst 2012-6-8
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.

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