Examples of javax.media.jai.InterpolationNearest

javax.media.jai.InterpolationNearest
A class representing nearest-neighbor interpolation. Since nearest-neighbor interpolation is simply pixel copying, and not really interpolation at all, most code that performs nearest-neighbor sampling will want to use special-purpose code. However, this class is provided both as a way to specify such interpolation, with the consumer making use of 'instanceof' to detect the particular class, and as a way to force general Interpolation users to use nearest-neighbor sampling. Note that this interpolator does not actually select the "nearest" pixel, but only uses the truncated integer pixel location (floor). This is an optimization reflecting an assumption about the implementation of the resampler. It is assumed that the conversion of continuous source image coordinates to discrete pixel indices drops the final subtraction of 0.5 for the case of a nearest-neighbor interpolator.
Neighborhoods of sizes 2x1, 1x2, 2x2, 4x1, 1x4, 4x4, Nx1 and 1xN, that is, all the interpolate() methods defined in the Interpolation class, are supported in the interest of simplifying code that handles a number of types of interpolation. In each case, the central sample is returned and the rest are ignored.
The class is marked 'final' so that it may be more easily inlined.

    pb.addSource(pi); // The source image
    pb.add(factor); // The xScale
    pb.add(factor); // The yScale
    pb.add(0.0F); // The x translation
    pb.add(0.0F); // The y translation
    pb.add(new InterpolationNearest()); // The interpolation
    // Create the scale operation
    return (JAI.create("scale", pb, null));
  }

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    assertNotNull(image);
    assertNotNull(PlanarImage.wrapRenderedImage(image));
    assertTrue(image.getColorModel() instanceof IndexColorModel);
    
    // nearest
                image = renderer.renderImage(gc, rs, new InterpolationNearest(), null, 256, 256);
                assertNotNull(image);
                assertNotNull(PlanarImage.wrapRenderedImage(image));
                assertTrue(image.getColorModel() instanceof IndexColorModel);

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        // scale if/as needed. Also check if the scale expands the coverage dimension for at least 1 pixel. 
        //
        ////
        if (scaleFactor != null && (Math.abs(coverageWidth*(scaleFactor - 1f)) >=1 || Math.abs(coverageHeight*(scaleFactor - 1f)) >= 1) ) {
            // Selection of the interpolation parameter
            Interpolation interp = interpolation != null ? interpolation : new InterpolationNearest();
            // Selection of the ScaleFactors in order to check if the final Raster has almost 1 pixel for Height and Width
            double scaleX = scaleFactor;
            double scaleY = scaleFactor;
            // RenderedImage associated to the coverage
            final RenderedImage imageToBescaled = gc2d.getRenderedImage();

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        finalRaster2Model.concatenate(decimationScaleTranform);


      // keep into account translation factors to place this tile
      finalRaster2Model.preConcatenate((AffineTransform) worldToGrid);
      
      final InterpolationNearest nearest = new InterpolationNearest();
      //paranoiac check to avoid that JAI freaks out when computing its internal layouT on images that are too small
      Rectangle2D finalLayout= ImageUtilities.layoutHelper(
          raster, 
          (float)finalRaster2Model.getScaleX(), 
          (float)finalRaster2Model.getScaleY(),

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                pb.addSource(image);
                pb.add(scaleX);
                pb.add(scaleY);
                pb.add(translateX);
                pb.add(translateY);
                pb.add(new InterpolationNearest());


                image = JAI.create("scale", pb);
                log.log(image, query.getRasterId(), "03_scale");


                int width = image.getWidth();

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            break;  
          case Bicubic:
            newImage = Utils.subsample(currentImage,baseTC,new InterpolationBicubic(2),downsampleStep,borderExtender);
            break;
          case Nearest:
            newImage = Utils.subsample(currentImage,baseTC, new InterpolationNearest(),downsampleStep,borderExtender);
            break;            
          default:
            throw new IllegalArgumentException("Invalid scaling algorithm "+scaleAlgorithm);//cannot get here
            
          }

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      final ParameterBlockJAI pb = new ParameterBlockJAI("filteredsubsample");
      pb.addSource(src);
      pb.setParameter("scaleX", new Integer(downsampleStep));
      pb.setParameter("scaleY", new Integer(downsampleStep));
      pb.setParameter("qsFilterArray", lowPassFilter);
      pb.setParameter("Interpolation", new InterpolationNearest());
      return JAI.create("filteredsubsample", pb,newHints);
    }

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    catch (IllegalArgumentException e) {
      indexOfBorderExtenderParam=-1;
    }


    final Interpolation interpolation =(Interpolation) (indexOfInterpolationParam==-1?
          new InterpolationNearest():
            parameters.parameters.getObjectParameter("interpolation")); ;
    final BorderExtender borderExtender= 
      (BorderExtender) (indexOfBorderExtenderParam!=-1? 
          parameters.parameters.getObjectParameter("BorderExtender"):
            ImageUtilities.DEFAULT_BORDER_EXTENDER);

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        coverage = (GridCoverage2D) reader.read(null);
        // Reader disposal
        reader.dispose();


        // Definition of the interpolation type
        nearest = new InterpolationNearest();
        bilinear = new InterpolationBilinear();
        bicubic = new InterpolationBicubic(8);


        // Definition of the background values
        nodata = new double[] { 0 };

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    public void testCoverageWithNearestInterp() throws MismatchedDimensionException,
            TransformException {
        // Execution of the RasterAsPointCollectionProcess setting hemisphere, scaleFactor and nearest interpolation
        boolean hemisphere = true;
        float scaleFactor = 2.0f;
        Interpolation interp = new InterpolationNearest();
        SimpleFeatureCollection collection = process.execute(coverage, null, scaleFactor, interp,
                hemisphere);
        // Check if the points are exactly as the number of pixel number
        Assert.assertEquals((int) (pixelNumber * scaleFactor * scaleFactor), collection.size());
        // Check if each Point Attribute contains the same values of the Input coverage

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