what is the meaning of bandwidth in octav?

what is the meaning of bandwidth in octav?

[Walter Roberson]

Are you referring to octaves as a measurement, or are you referring to the software product "octave" ?

[hind]

I think octave as a measurement, I want to know how could I represent it in my code,

actually you may see my question so trivial but I didn't know anything about this.

[Jan]

@hind: No, your question is not trivial. It contains not enough details to be answered easily - or at all.

[hind]

actually I want to write code of circular gabor filter in matlab and there is relations between (gaussian sigma σ) and (central frequency of gabor fc) is described as

σ.fc= (1/pi).sqrt(ln2/2).((2^ΔF+1)/(2^ΔF-1))

where ΔF (∈[0.5, 2.5]) denotes the bandwidth in octave. and σ with five-pixel width

Idon't know how to represent this correctly

Answer 1

[hind]

this my code is it rghit?

sigma = 5;
fc= (1/pi*sigma)*sqrt(log(2)/2)*(((2^1.12)+1)/((2^1.12)-1));

for x = -fix(sigma):fix(sigma)

for y = -fix(sigma):fix(sigma)

          G(fix(sigma)+x+1,fix(sigma)+y+1) = (exp(-.5*((x/sigma)^2+(y/sigma)^2)))* cos(2*pi*fc*(sqrt((x)^2+(y)^2)));
      end
  end