View License

Download apps, toolboxes, and other File Exchange content using Add-On Explorer in MATLAB.

» Watch video

Highlights from
Gaussian Bandpass Filter for Image Processing

5.0 | 4 ratings Rate this file 31 Downloads (last 30 days) File Size: 2.33 KB File ID: #30947 Version: 1.1
image thumbnail

Gaussian Bandpass Filter for Image Processing



01 Apr 2011 (Updated )

This function performs Gaussian bandpass filtering in the frequency domain

| Watch this File

File Information

Butterworth Bandpass Filter
This simple function was written for my Digital Image Processing course
at Eastern Mediterranean University taught by
Assoc. Prof. Dr. Hasan Demirel
for the 2010-2011 Spring Semester
for the complete report:

Written By:
Leonardo O. Iheme (
24th of March 2011

  I = The input grey scale image
  d0 = Lower cut off frequency
  d1 = Higher cut off frequency

The function makes use of the simple principle that a bandpass filter
can be obtained by multiplying a lowpass filter with a highpass filter
where the lowpass filter has a higher cut off frquency than the high pass filter.

ima = imread('grass.jpg');
ima = rgb2gray(ima);
filtered_image = gaussianbpf(ima,30,120);
Gaussian Bandpass Filter

Required Products Image Acquisition Toolbox
Image Processing Toolbox
MATLAB release MATLAB 7.10 (R2010a)
Tags for This File   Please login to tag files.
Please login to add a comment or rating.
Comments and Ratings (5)
14 Jul 2015 John D

John D (view profile)

Hi Leonardo, Why is the fft of the original image being added to the filtered version of the fft?

filtered_image = fftI + filter3.*fftI;

12 Nov 2014 Leonardo O. Iheme

Hello Sudarshan,
Thanks for the 5* rating.
Have you tried initializing with zeros instead? I think you should and then tell us all what happens.

Comment only
11 Nov 2014 Sudarshan

Why do you initialise the filters that way? lines 45-47. Would be of great help.. Thanks in advance

25 Nov 2013 Anfisa

Anfisa (view profile)

14 Oct 2013 Robin Martin

04 Apr 2011 1.1

Updated the title

Contact us