'c' language style code for dilation

A 'c' style code for dilation

Description

In this initially the color image is thresholded an then the dilation operation applied

• MATLAB release: MATLAB 7 (R14)

[Anon]

Uuuh (shudder)... there are so many shortcomings that I just don't know where to start...

1. it's a script and not a function
2. uses clc and clear all at the beginning
3. tries to read an image that has not been supplied with the submission (dil.jpg)
4. unnecessary use of nested loops
5. no preallocation
6. no comments
7. no help
8. tries to index in variables that have not been created before
9. and so on...

Please remove.

[Rama Chandra Rao Naradasu]

Friends it is a general code which is written using the c language method.
- I used the only rgb2gray() function to convert RGB image to grayscale image.
- I just used 'clc' & 'clear all' to clear the main screen & to watch only the output of my program.
- Please remember that 'dil.jpg' image is used by me if u r familiar with matlab programming change 'dil.jpg' to ur own image.
- It is not possible to apply dilation on binary image without these loops.(Please note it). There is nothing unnecessary there is a need for using those loops.
-There is no need for preallocations.

I didn't gave clear help and comments that is the problem with the code...............
I will check it.

[Jos (10584)]

As long as you
- do not know how to optimize codes like this (in matlab, not in C!)
% -- begin of code --
for i=1:a
    for j=1:b
        y(i,j)=0;
        dia(i,j)=0;
     end
end
% -- end of code --

- do not know the advantages of pre-allocation
- do not the difference between functions and scripts
- uses clc and clear all without a good reason

your function is rather useless to others ...

[Bruno Luong]

Matlab programming requires different approach and style than C programming. I suggest the OP to consider seriously the two comments the code has received and I hope he will improve his code.

[Anon]

This function might be useful for others who want to learn how NOT to code in Matlab. Is this your intention?

[Su Dongcai]

Dear Rama Chandra Rao Naradasu:
  I think it would be better if you coded it using "mexfunction" in 'c' or 'c++' type, it would be a good demonstration of how imdilate work.

[Rob Campbell]

You should provide the example image. People are unlikely to investigate your function at all unless you do this. Personally, I don't have a suitable image lying around. You clearly have one, so it should be included.

You shouldn't have the clc there. The user might not want their screen cleared and it isn't need for your code.

This should be a function. The reason is that functions will run faster than scripts in Matlab. I believe those with many loops will see a particularly large speed improvement.