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how to get pixel from an image in multidimensional array

Posted on 2006-11-17
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Last Modified: 2008-01-09
I'm using JAI package.
How to get the pixel from an image but in the form multidimensional array?
Cause i must read the pixel in 8x8 block.
I found method getPixels() but the result is single array.
Can someone help me to solve this problem? Pls, pls, pls...
Thank you
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Question by:cemplukcute2003
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3 Comments
 

Author Comment

by:cemplukcute2003
ID: 17965077
Ok, i'm trying using PixelAccessor class.
And from there i got a method getPixels which give me the result in UnpackedImageData type.
Here is my code :

RenderedImage img = JAI.create("fileload", "lena512.pgm");
Raster rasterPic = img.getData();
SampleModel sample = rasterPic.getSampleModel();
PixelAccessor pixAcc = new PixelAccessor(img);
UnpackedImageData pix = pixAcc.getPixels(rasterPic, rasterPic.getBounds(), DataBuffer.TYPE_INT, false);
int[][] tempPix = pix.getIntData();

But why the method getIntData() gives result 1 row only?
Doesn't it suppose to give the whole pixel in an image?
Is there someone who can help me to solve this?
Thank you
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Expert Comment

by:ADSLMark
ID: 17966282
Well I took the liberty to look inside the source code of the JAI PixelAccessor.

The javadoc is very unclear but the double array is used for bands. I found that the pixel information is stored in a single array and then stored into a double array where the number of bands becomes the second array length. So all the pixels are stored in sequence, for 8x8 that would mean 64 integers, just make a double for loop to get 8 integers 8 times, shouldn't be so hard.

Mark
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LVL 9

Accepted Solution

by:
owenli27 earned 130 total points
ID: 17967689
I think it is a problem in the existed JAI version. Maybe new version could fix it.  For a temp solution, you can add a couple of line to create a two-dimenstion array by yourself.
...
...
int[][] tempPix = pix.getIntData();

int index = 0;
int[][] myPix = new int[img.getHeight()][img.getWidth()];            
for(int i=0; i<myPix.length; i++)
    for(int j=0; j<myPix[i].length; j++)
       myPix[i][j] = tempPix[0][index++];
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