JAI pixel value after dct operation

Question

Hi. i've recently start to programming with JAI.
I've applied the dct Discrete cosine Transform to a source image.
My Problem is the follow: "How can i obtain the RGB value of each pixel from the resulting dct image".
Here's the code:
String filename = "C:\\...\viola.jpg";
RenderedImage src = (RenderedImage)JAI.create("fileload", filename);
ParameterBlock pb = (new ParameterBlock()).addSource(src);
PlanarImage dct = JAI.create("dct", pb, null);
int width  = dct.getWidth();
int height = dct.getHeight();          
double[] dctData =
dct.getData().getPixels(0, 0, width, height, (double[])null);
FloatDoubleColorModel cm = (FloatDoubleColorModel) dct.getColorModel();
/* I want to have the RGB int value of the first dctData pixel */
int rgbint = cm.getRGB(dctData[1])  /* here the problem*/When i runthe code the follow exception is thrown:
Exception in thread "main" java.lang.ClassCastException: java.lang.Double cannot be cast to [F
at javax.media.jai.FloatDoubleColorModel.getRGB(FloatDoubleColorModel.java:476)
at Menu.Interfaccia.DCTIDCTTransformer.main(DCTIDCTTransformer.java:107)How can i obtain the rgb value in the correct way?
Edited by: Anton87 on Feb 21, 2010 6:29 AM

Answer 1

My solution would be to work with the image in its raw format. Extract the image into a 2 dimensional array, loop throught the rows and columns and compare to your zero crossing window detector. after you have aquired the new image array, you set pixels that are next to an edge 0 and the rest #ffff. this will create a binary image (black and white) with the edges black and rest white. Be careful of your conventions used to determine what are edges. This may seem primitive, but thats just the way i think :P
-fastrike