introduction to java advanced imaging.htm

是一部关于java高级图像处理的的一本入门书

  applications also require certain types of compressed image files. It is 
  beyond the scope of any API to support the hundreds of known compression 
  algorithms, so JAI also supports the addition of customized coders and 
  decoders (codecs), which can be added to the core API. 
  <P><A name=54289>
  <H3>1.3.5 <IMG 
  src="Introduction to Java Advanced Imaging.files/space.gif">Device 
  Independent</H3></A>The processing of images can be specified in 
  device-independent coordinates, with the ultimate translation to pixels being 
  specified as needed at run time. JAI's "renderable" mode treats all image 
  sources as rendering-independent. You can set up a graph (or chain) of 
  renderable operations without any concern for the source image resolution or 
  size; JAI takes care of the details of the operations. 
  <P>To make it possible to develop platform-independent applications, JAI makes 
  no assumptions about output device resolution, color space, or color model. 
  Nor does the API assume a particular file format. Image files may be acquired 
  and manipulated without the programmer having any knowledge of the file format 
  being acquired. 
  <P><A name=52444>
  <H3>1.3.6 <IMG 
  src="Introduction to Java Advanced Imaging.files/space.gif">Powerful</H3></A>JAI 
  supports complex image formats, including images of up to three dimensions and 
  an arbitrary number of bands. Many classes of imaging algorithms are supported 
  directly, others may be added as needed. 
  <P>JAI implements a set of core image processing capabilities, including image 
  tiling, regions of interest, and deferred execution. The API also implements a 
  set of core image processing operators, including many common point, area, and 
  frequency-domain operations. For a list of the available operators, see <A 
  href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Programming-environ.doc.html#55112">Section 
  3.6, "JAI API Operators</A>." 
  <P><A name=52446>
  <H3>1.3.7 <IMG 
  src="Introduction to Java Advanced Imaging.files/space.gif">High 
  Performance</H3></A>A variety of implementations are possible, including 
  highly-optimized implementations that can take advantage of hardware 
  acceleration and the media capabilities of the platform, such as MMX on Intel 
  processors and VIS on UltraSparc. 
  <P><A name=52448>
  <H3>1.3.8 <IMG 
  src="Introduction to Java Advanced Imaging.files/space.gif">Interoperable</H3></A>JAI 
  is integrated with the rest of the Java Media APIs, enabling media-rich 
  applications to be deployed on the Java platform. JAI works well with other 
  Java APIs, such as Java 3D and Java component technologies. This allows 
  sophisticated imaging to be a part of every Java technology programmer's tool 
  box. 
  <P>JAI is a Java Media API. It is classified as a Standard Extension to the 
  Java platform. JAI provides imaging functionality beyond that of the Java 
  Foundation Classes, although it is compatible with those classes in most 
  cases. 
  <P><A name=53715>
  <H2>1.4 <IMG src="Introduction to Java Advanced Imaging.files/space.gif">A 
  Simple JAI Program</H2></A>Before proceeding any further, let's take a look at 
  an example JAI program to get an idea of what it looks like. <A 
  href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Introduction.doc.html#55064">Listing 
  1-1</A> shows a simple example of a complete JAI program. This example reads 
  an image, passed to the program as a command line argument, scales the image 
  by 2x with bilinear interpolation, then displays the result.
  <P><CAPTION><FONT size=-1><B><A name=55064>
  <CENTER><FONT size=-1><B><I>Listing 1-1 </I><IMG 
  src="Introduction to Java Advanced Imaging.files/sm-blank.gif" border=0> 
  <STRONG>Simple Example JAI Program </STRONG></B></FONT></CENTER></A>
  <P></B></FONT></CAPTION>
  <HR>
  <TR valign="top"><TD rowspan="9" colspan="1"><PRE>     import java.awt.Frame;
     import java.awt.image.renderable.ParameterBlock;
     import java.io.IOException;
     import javax.media.jai.Interpolation;
     import javax.media.jai.JAI;
     import javax.media.jai.RenderedOp;
     import com.sun.media.jai.codec.FileSeekableStream;
     import javax.media.jai.widget.ScrollingImagePanel;
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TD rowspan="9" colspan="1"><PRE>     /**
      * This program decodes an image file of any JAI supported
      * formats, such as GIF, JPEG, TIFF, BMP, PNM, PNG, into a
      * RenderedImage, scales the image by 2X with bilinear
      * interpolation, and then displays the result of the scale
      * operation.
      */
     public class JAISampleProgram {
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TD rowspan="9" colspan="1"><PRE>         /** The main method. */
         public static void main(String[] args) {
             /* Validate input. */
             if (args.length != 1) {
                 System.out.println("Usage: java JAISampleProgram " +
                                    "input_image_filename");
                 System.exit(-1);
             }
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TD rowspan="11" colspan="1"><PRE>             /*
              * Create an input stream from the specified file name
              * to be used with the file decoding operator.
              */
             FileSeekableStream stream = null;
             try {
                 stream = new FileSeekableStream(args[0]);
             } catch (IOException e) {
                 e.printStackTrace();
                 System.exit(0);
             }
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TD rowspan="10" colspan="1"><PRE>             /* Create an operator to decode the image file. */
             RenderedOp image1 = JAI.create("stream", stream);
             /*
              * Create a standard bilinear interpolation object to be
              * used with the "scale" operator.
              */
             Interpolation interp = Interpolation.getInstance(
                                        Interpolation.INTERP_BILINEAR);
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TD rowspan="13" colspan="1"><PRE>             /**
              * Stores the required input source and parameters in a
              * ParameterBlock to be sent to the operation registry,
              * and eventually to the "scale" operator.
              */
             ParameterBlock params = new ParameterBlock();
             params.addSource(image1);
             params.add(2.0F);         // x scale factor
             params.add(2.0F);         // y scale factor
             params.add(0.0F);         // x translate
             params.add(0.0F);         // y translate
             params.add(interp);       // interpolation method
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TD rowspan="3" colspan="1"><PRE>             /* Create an operator to scale image1. */
             RenderedOp image2 = JAI.create("scale", params);
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TD rowspan="4" 
  colspan="1"><PRE>             /* Get the width and height of image2. */
             int width = image2.getWidth();
             int height = image2.getHeight();
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TD 
  rowspan="4" colspan="1"><PRE>             /* Attach image2 to a scrolling panel to be displayed. */
             ScrollingImagePanel panel = new ScrollingImagePanel(
                                             image2, width, height);
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TD 
  rowspan="7" colspan="1"><PRE>             /* Create a frame to contain the panel. */
             Frame window = new Frame("JAI Sample Program");
             window.add(panel);
             window.pack();
             window.show();
         }
     }
</PRE><TR valign="top"><TR valign="top"><TR valign="top"><TR valign="top"><TR 
  valign="top"><TR valign="top">
  <HR>

  <P>
  <P>
  <HR>
  <BR>
  <CENTER><A 
  href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/JAITOC.fm.html"><IMG 
  alt=Contents 
  src="Introduction to Java Advanced Imaging.files/contents.gif"></A> <A 
  href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/Preface.doc.html"><IMG 
  alt=Previous 
  src="Introduction to Java Advanced Imaging.files/previous.gif"></A> <A 
  href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/J2D-concepts.doc.html"><IMG 
  alt=Next src="Introduction to Java Advanced Imaging.files/next.gif"></A> 
  <P><FONT size=5><I>Programming in Java Advanced Imaging</I></FONT> 
  </CENTER><BR>
  <H5><A 
  href="http://java.sun.com/products/java-media/jai/forDevelopers/jai1_0_1guide-unc/copyright.html">Copyright</A> 
  &copy; 1999, Sun Microsystems, Inc. All rights reserved.</H5><!-- Last updated: Tue Nov 02 17:07:08 1999 --></BLOCKQUOTE>
<SCRIPT language=JavaScript 
src="Introduction to Java Advanced Imaging.files/s_code_remote.js"></SCRIPT>
</BODY></HTML>