DZone Snippets: images code

Howto resize multiple pictures, graphics, images

Tue, 29 Apr 2008 16:41:33 GMT



for k in $(ls *.jpg); do convert -resize 800 -quality 80 $k r800-$k; done

text input /w background image

thescriptkeeper (mona) — Wed, 22 Aug 2007 14:43:56 GMT

// self-explanatory. see title.

Image aggregator

Minimiscience (Guildorn Tanaleth) — Thu, 05 Jul 2007 04:08:17 GMT

This PHP snippet outputs the contents of a table (beginning & ending tags not included) containing all the images from the current directory.

 $columns = 3;

 $im = glob("*.{gif,jpg,png}", GLOB_BRACE);

 $rows = ceil(count($im) / $columns);

 for ($i = 0; $i < $rows; $i++) {

  echo "\n";

  for ($j = $columns*$i; isset($im[$j]) && $j - $columns*$i < $columns; $j++) {

   echo "$im[$j]
";

  }

  echo "";

 }

?>

Java - Erode

whitetiger () — Sun, 05 Nov 2006 19:27:14 GMT

// JAI Filter erode



public RenderedImage erode(BufferedImage img)

	{

		KernelJAI kernel = new KernelJAI(7, 7, new float[]{

															0, 0, 0, 0, 0, 0, 0,

															0, 1, 1, 1, 1, 1, 0,

															0, 1, 1, 1, 1, 1, 0,

															0, 1, 1, 1, 1, 1, 0,

															0, 1, 1, 1, 1, 1, 0,

															0, 1, 1, 1, 1, 1, 0,

															0, 0, 0, 0, 0, 0, 0

															});

		ParameterBlock pb = new ParameterBlock();

		pb.addSource(img);

		pb.add(kernel);

		

		return JAI.create("erode", pb);

	}

Java - subTraction

whitetiger () — Sun, 05 Nov 2006 16:23:01 GMT

// Use JAI filter



public RenderedImage subTraction(BufferedImage img1, BufferedImage img2)

	{

		ParameterBlock pb = new ParameterBlock();

		pb.addSource(img1);

		pb.addSource(img2);

		

		return JAI.create("subtract", pb);

	}

Java - showBitPlanes

whitetiger () — Sun, 05 Nov 2006 00:41:29 GMT

// the input it must be a b/w image



public BufferedImage showBitPlanes(BufferedImage bi, int lv)

	{

		int level = 0;

		

		switch(level)

		{

			case 0:

				level = 128;

				break;

			case 1:

				level = 64;

				break;

			case 2:

				level = 32;

				break;

			case 3:

				level = 16;

				break;

			case 4:

				level = 8;

				break;

			case 5:

				level = 4;

				break;

			case 6:

				level = 2;

				break;

			case 7:

				level = 1;

				break;

			default:

					return null;

		}

		

		int width = bi.getWidth();

		int height = bi.getHeight();

		

		BufferedImage img = new BufferedImage(width, height, bi.getType());

		

		for(int x=0; x			for(int y=0; y				img.setRGB(x, y, ((bi.getRGB(x, y) & level)/level)*255);

		

		return img;

	}

Matlab - showBitPlanes

whitetiger () — Sun, 05 Nov 2006 00:16:40 GMT



% Ritorna i Bit Plabes dell'immagine a toni di grigio



function showBitPlanes(img)



    imgGray = double( rgb2gray(img) );

    titleString = 'bit planes ';

    

    % MSB ... LSB

    k = 128;

    

    for b=1:8

        

        subplot(2, 4, b);

        imshow( (bitand(imgGray, k) / k) * 255 ); % Fa un and dei bit

        title([titleString int2str(b-1)]);

        k = k/2; % Shifta di 2 i bit

        

    end;

    

return;

Java - Dilate3

whitetiger () — Sat, 04 Nov 2006 23:19:27 GMT

// pixel before the filter
// |--|--|--|
// | | | |
// |--|--|--|
// | | *| |
// |--|--|--|
// | | | |
// |--|--|--|

// pixel after the filter
// |--|--|--|
// | *| *| *|
// |--|--|--|
// | *| *| *|
// |--|--|--|
// | *| *| *|
// |--|--|--|



public BufferedImage dilate3(BufferedImage bi)

	{

		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());

		

		Kernel kernel = new Kernel(3, 3, new float[] {

														1f, 1f, 1f, 

														1f, 1f, 1f, 

														1f, 1f, 1f

													 });

		

		ConvolveOp op = new ConvolveOp(kernel);

		op.filter(bi, buff);

		

		return buff;

	}

Java - EdgeW / EdgeH

whitetiger () — Sat, 04 Nov 2006 00:23:26 GMT



public BufferedImage EdgeW(BufferedImage bi)

	{

		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());

		

		Kernel kernel = new Kernel(3, 3, new float[] {

														-1f, 0f, 1f, 

														-2f, 0f, 2f, 

														-1f, 0f, 1f

													 });

		

		ConvolveOp op = new ConvolveOp(kernel);

		op.filter(bi, buff);

		

		return buff;

	}



	public BufferedImage EdgeH(BufferedImage bi)

	{

		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());

		

		Kernel kernel = new Kernel(3, 3, new float[] {

														-1f, -2f, -1f, 

														 0f,  0f,  0f, 

														 1f,  2f,   1f

													 });

		

		ConvolveOp op = new ConvolveOp(kernel);

		op.filter(bi, buff);

		

		return buff;

	}

Java - Brightness

whitetiger () — Fri, 03 Nov 2006 13:21:49 GMT



public BufferedImage brightness(BufferedImage bi, float value)

	{

		BufferedImage buff = new BufferedImage(bi.getWidth(), bi.getHeight(), bi.getType());

		

		Kernel kernel = new Kernel(1, 1, new float[] {value});

		

		ConvolveOp op = new ConvolveOp(kernel);

		op.filter(bi, buff);

		

		return buff;

	}