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CITS4402 Computer Vision
Week 4 Laboratory Exercises
Due: Check the deadline on cssubmit.
Spatial Filtering and GUI Programming in Matlab
There are two aims of this laboratory session. The first is to practice some of the spatial filters you learned during lecture
4. The second is to introduce you to Matlab GUI programming. You will need to make a GUI program which looks like the
following:
2020/3/19 CITS4402 Computer Vision
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Read this link for learning the basics. The GUI should have the following functionality.

1- Load Image: This button should open a file selection dialog box so you can chose your image. That image must
then get displayed in the left side of your GUI.

2- Left side plot: This must always show the image that you have loaded.

3- Right side plot: This must show the output of any operation that you performed on the left image.

4- Histogram Equalize: Pressing this button should histogram equalize the left image and display it in the right side
plot.

5- Low Pass: Pressing this button should make a Gaussian filter of size 3 (defualt) and sigma 2 (default), apply it to the
left image and display the result in the right image.

6- The two values next to Low Pass button: You should be able to change these values and when you press the
Low Pass button a different filter will be applied to the image.

7- High Pass: Pressing this button should apply a high pass filter in the spatial domain to the left image and display
the result on the right side. Use fixed values for the kernel.

8- High Boost: Pressing this button should apply a high boost filter (3x3) in the spatial domain using the boosting
factor written next to it.

9- Boosting factor: The value next to High Boost button is the boosting factor. You should be able to change it.

Hints:
- To start the GUI programming type "guide" and press enter in Matlab command shell
- Use the "uigetfile( )" function for file selection [Link to documentation]
- Drag and drop buttons etc
- Right click on a button to edit its properties
- Right click on a button to access the callback function (where you will write the code that gets executed on button
press)
- Use "handles.varX = yourVariable;" followed by "guidata(hObject, handles);" to access variables generated in one
function from a different function

Submission Requirements
Submit the week4lab.fig and week4lab.m files
Submit your test image(s)
Your Matlab GUI will be run and tested in the marking.
Your Matlab code should be commented (but not over-commented) and indented for readability (Hint: Use the Matlab
Editor to help you indent your code).
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This Page
Updated by: Ajmal Mian
Thu Mar 19 2020 14:48:02 GMT+0800 (中国标准时间)