Mean image subtraction

[Muqeet Khan]

I have created a mean image out of all the images in a series. Now i would like to subtract the mean image from the actual original image. I do it something like this

       int origSize = targetImage.getWidth() * targetImage.getHeight();
       int subSize = meanImage.getWidth() * meanImage.getHeight();

        for (int x = 0; x < meanImage.getWidth(); x++) {
                 
                for(int y = 0; y < meanImage.getHeight(); y++) {
                        int subPix  = meanImage.get(x, y);
                        int origPix = targetImage.get(x, y);
                        double newPix = origPix - subPix;

                        targetImage.set(x, y, (int) Math.round(newPix));
                }
        }


I don't see the proper effect on the canvas when i apply this? its completely blacked out. Any ideas?

[Jarek Sacha-2]

The simplest way to subtract images is like this:

        targetImage.copyBits(meanImage, 0, 0, Blitter.SUBTRACT);

Make sure that you images are FloatProcessor, otherwise you will have problems with negative values.

You do not show code that you use for display, so it is hard to say why you have problem there.

Jarek

You wrote:

I have created a mean image out of all the images in a series. Now i would

>like to subtract the mean image from the actual original image. I do it
>something like this
>
>       int origSize = targetImage.getWidth() * targetImage.getHeight();
>       int subSize = meanImage.getWidth() * meanImage.getHeight();
>
> for (int x = 0; x < meanImage.getWidth(); x++) {
>
> for(int y = 0; y < meanImage.getHeight(); y++) {
> int subPix  = meanImage.get(x, y);
> int origPix = targetImage.get(x, y);
> double newPix = origPix - subPix;
>
> targetImage.set(x, y, (int) Math.round(newPix));
> }
> }
>
>
>I don't see the proper effect on the canvas when i apply this? its
>completely blacked out. Any ideas?

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