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02.02.2008 at 06:18AM PST, ID: 23131916

	[x] Attachment Details

[x]

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7.4

convert picture pixels to matrix array- 2-D DCT in Java

Zones: Java Programming Language, MatLab Programming Language

Hi
I need to write Java Applet code for 2-D DCT (Discrete cosine transform) something like "dctdemo" in Matlab.

I need to have one original image (image for compressing ) , one result image (compresed image). When i click button i want to displayed result image on the screen from original (compressed with selected quality ex. from 1-100).

How can I convert picture pixels to matrix array,calculate them with formula and draw array in to result picture??? or the procedure is different??

So please give me java applet code for this or code for converting pixels, also i need code for drawing pictures from matrix array.

Thank you

Attachments:

eda2155809a0e714e7c8d327e6e108df.png (2 KB) (File Type Details)

In attachment is formula for calculating 2-d dct

Start your free trial to view this solution

Question Stats

Zone: Programming

Question Asked By: nikola_mk

Solution Provided By: CEHJ

Participating Experts: 1

Solution Grade: B

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02.03.2008 at 05:00AM PST, ID: 20808567

Rank: Genius

CEHJ:

Have a look at http://people.csail.mit.edu/koen/PVEM.java and the code beginning with the comment:

"// Get access to the pixel data"

02.03.2008 at 07:44AM PST, ID: 20808937

nikola_mk:

Thank you CEHJ. but i need pixels in matrix( [][] ) not in single array. Do you see formula X(k1,k2)???

02.03.2008 at 09:57AM PST, ID: 20809316

Rank: Genius

CEHJ:

>>i need pixels in matrix( [][] ) not in single array.

That's not a problem - just divide it up into matrix[image.height][image.width]

>>Do you see formula X(k1,k2)???

Yes

02.03.2008 at 10:26AM PST, ID: 20809459

nikola_mk:

Hi CHEJ

Matrix must luck like in this image

[image.height][image.width] are constant values

Examp. i want to see pixel in 2-nd row and 3-col : mat[2,3] and change it with my formula, and save in to the new matrix array. and on the end draw the new array on new picture!!!

Now i think that you understand me.

Sorry for my english

images.jpg (2 KB) (File Type Details)

Matrix must luck like this image

02.03.2008 at 10:53AM PST, ID: 20809533

Rank: Genius

CEHJ:

In that case, unpack it into

int[][] matrix = new int[8][8];

That would of course mean that your image has 64 pixels - is that the case?

02.04.2008 at 05:30AM PST, ID: 20814049

nikola_mk:

CHEJ

function getPixels fill one dimensional array, i'm locking for matrix. in your example rgbArray is one dimensional array!!!
[1 2 3 4 5 62 12 1 4 56] not like this!!!!

Thanks

02.04.2008 at 05:35AM PST, ID: 20814085

nikola_mk:

I need something that luck like this:

for i=0 to height do
for j=0 to with do
matrih[i,j]= pic.getPihelFromPicture(i,j)
}
}
This is pseudo code
But function getPihelFromPicture is important???

02.04.2008 at 05:42AM PST, ID: 20814134

nikola_mk:

Or how can I convert 1d array to 2d array(matrix)???

02.04.2008 at 05:50AM PST, ID: 20814195

Rank: Genius

CEHJ:

for (int i = 0; i < height;i++) {
      for(int j = 0; j < width;j++)
           matrix[i,j]= oneDArray[i * width + j];
      }
}

Accepted Solution

02.05.2008 at 04:32AM PST, ID: 20822350

nikola_mk:

CEHJ thank you for this,
Can you tell me how can I display image from PC in to the BufferedImage ??

02.05.2008 at 04:35AM PST, ID: 20822363

Rank: Genius

CEHJ:

You can add the image to a label

guiContainer.add(new JLabel(new ImageIcon(imageByteArray)));

02.07.2008 at 07:51AM PST, ID: 20841774

nikola_mk:

CEHJ:can you give me code for assign image from PC to bufferedimage!!!
How can i tell to the bufferedimage, witch image on PC do I put in bufferedimage!!for geting pixels

I am new in java!!

Thank you !!

02.07.2008 at 07:58AM PST, ID: 20841849

Rank: Genius

CEHJ:

BufferedImage bi = javax.imageio.ImageIO.read(new File("x.jpg"));

CEHJ

02.18.2008 at 11:44PM PST, ID: 20926420

:-)

nikola_mk

02.19.2008 at 04:05AM PST, ID: 20927463

;)
CEHJ if you can please tell me who are library (imports) for this:
BufferedImage bi = javax.imageio.ImageIO.read(new File("x.jpg"));

Thak you!

CEHJ

02.19.2008 at 04:14AM PST, ID: 20927512

java.io.BufferedImage bi = javax.imageio.ImageIO.read(new java.io.File("x.jpg"));

nikola_mk

02.19.2008 at 04:31AM PST, ID: 20927609

InputStream in =
getClass().getResourceAsStream("image.jpg");

BufferedImage bi = javax.imageio.ImageIO.read(in);

I use this code, but where image.jpg can be placed ???
in working directory? or?

CEHJ

02.19.2008 at 05:16AM PST, ID: 20927961

Anywhere you want. That one is in the current directory

20080236-EE-VQP-29 / EE_QW_2_20070628