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Recursive Method for Spliting an Image into 4 quadrants

Posted on 2005-05-03
Medium Priority
Last Modified: 2009-07-29
Hi Everybody

I am trying to split an image (64*64 pixels), in to four quadrants. That means now i have four quadrants each of 32*32 pixels. Now i further want to divide one quadrant to 4 until it reaches the single pixel.

Please tell me a recursive code or an Algorithm to implement this.

Question by:ZUBAIR
LVL 24

Expert Comment

ID: 13920217
This is all about recursion, and has few to do with the splitting:

void recursiveMethod(argument)   // What ever the argument may be.
    if(argument is big enough to go on)   // Warning this is not JAVA but a META-notation

// This might look like nonsense, but THIS IS RECURSION.
You can apply it in several languages in several cases.

The critirium for you is:  when doesn't it make sense to go on.
Like: when is the given image too small for a reasonable split.


Author Comment

ID: 13920327
I need some code... that will make it easy for me to understant
LVL 15

Expert Comment

ID: 13920643
in the inside (recursive) calls gives a 'piece of picture' as argument to the next level of recursion.
that meand that the method itself must have a 'piece of picture' as parameter. it is that piece of picture that is then split into quarters inside.

We really cannot help more than that, as this is obviously a homework assignment.

Anuway look a scuriwaress pseudocode carefully. once you 'get' the idea the coding is pretty easy.

regards JakobA

Accepted Solution

limaideal earned 1000 total points
ID: 13922266
should be like this:

Class MyImage
      public MyImage getPart( int x, int y, int width, int height );

List splitImage( MyImage TheImage, int x, int y, int width, int height )
      if ( width > 1 && height > 1 )
            List ret = new Arraylist();
            ret.addAll( splitImage( TheImage.getPart( x,y,width/2, height/2 )) );
            ret.addAll( splitImage( TheImage.getPart( x + width / 2 ,y,width/2, height/2 )) );
            ret.addAll( splitImage( TheImage.getPart( x ,y+heght/2,width/2, height/2 )) );
            ret.addAll( splitImage( TheImage.getPart( x + width / 2 ,y + height/2,width/2, height/2 )) );
            return ret;
            List ret = new ArrayList();
            ret.add( TheImage.getPart(x,y,width, height));

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