/** Tests the {@link #rescaleToBytes()} operation. */
@Test
public void rescaleToBytes() {
assertTrue("Assertions should be enabled.", ImageWorker.class.desiredAssertionStatus());
// set up synthetic images for testing
final RenderedImage test1 =
ConstantDescriptor.create(128.0f, 128.0f, new Double[] {20000.0}, null);
final RenderedImage test2 =
ConstantDescriptor.create(128.0f, 128.0f, new Double[] {255.0}, null);
final RenderedImage test3 = getSynthetic(20000);
final RenderedImage test4 = getSynthetic(255);
// starting to check the results
// single band value exceed the byte upper bound and is constant
final ImageWorker test1I = new ImageWorker(test1).rescaleToBytes();
Assert.assertEquals("Format", test1I.getRenderedOperation().getOperationName());
final double[] maximums1 = test1I.getMaximums();
Assert.assertTrue(maximums1.length == 1);
Assert.assertEquals(255.0, maximums1[0], 1E-10);
final double[] minimums1 = test1I.getMinimums();
Assert.assertTrue(minimums1.length == 1);
Assert.assertEquals(255.0, minimums1[0], 1E-10);
// single band value does not exceed the byte upper bound and is constant
final ImageWorker test2I = new ImageWorker(test2).rescaleToBytes();
Assert.assertEquals("Format", test2I.getRenderedOperation().getOperationName());
final double[] maximums2 = test1I.getMaximums();
Assert.assertTrue(maximums2.length == 1);
Assert.assertEquals(255.0, maximums2[0], 1E-10);
final double[] minimums2 = test1I.getMinimums();
Assert.assertTrue(minimums2.length == 1);
Assert.assertEquals(255.0, minimums2[0], 1E-10);
// single band value exceed the byte upper bound
ImageWorker test3I = new ImageWorker(test3);
final double[] maximums3a = test3I.getMaximums();
final double[] minimums3a = test3I.getMinimums();
test3I.rescaleToBytes();
Assert.assertEquals("Rescale", test3I.getRenderedOperation().getOperationName());
final double[] maximums3b = test3I.getMaximums();
final double[] minimums3b = test3I.getMinimums();
if (maximums3a[0] > 255) {
Assert.assertTrue(Math.abs(maximums3a[0] - maximums3b[0]) > 1E-10);
Assert.assertTrue(Math.abs(255.0 - maximums3b[0]) >= 0);
}
if (minimums3a[0] < 0) {
Assert.assertTrue(minimums3b[0] >= 0);
}
// single band value does not exceed the byte upper bound
ImageWorker test4I = new ImageWorker(test4);
final double[] maximums4a = test4I.getMaximums();
final double[] minimums4a = test4I.getMinimums();
test4I.rescaleToBytes();
Assert.assertEquals("Format", test4I.getRenderedOperation().getOperationName());
final double[] maximums4b = test4I.getMaximums();
final double[] minimums4b = test4I.getMinimums();
Assert.assertEquals(maximums4a[0], maximums4b[0], 1E-10);
Assert.assertEquals(minimums4a[0], minimums4b[0], 1E-10);
// now test multibands case
final RenderedImage multiband = BandMergeDescriptor.create(test2, test3, null);
ImageWorker testmultibandI = new ImageWorker(multiband);
final double[] maximums5a = testmultibandI.getMaximums();
final double[] minimums5a = testmultibandI.getMinimums();
testmultibandI.rescaleToBytes();
final double[] maximums5b = testmultibandI.getMaximums();
final double[] minimums5b = testmultibandI.getMinimums();
Assert.assertEquals(maximums5a[0], maximums5b[0], 1E-10);
Assert.assertEquals(minimums5a[0], minimums5b[0], 1E-10);
Assert.assertTrue(Math.abs(maximums5a[1] - maximums5b[1]) > 1E-10);
Assert.assertTrue(Math.abs(minimums5a[1] - minimums5b[1]) > 1E-10);
}
/**
* Returns the specified property.
*
* @param name Property name.
* @param opNode Operation node.
*/
public Object getProperty(String name, Object opNode) {
validate(name, opNode);
if (opNode instanceof RenderedOp && name.equalsIgnoreCase("roi")) {
RenderedOp op = (RenderedOp) opNode;
ParameterBlock pb = op.getParameterBlock();
// Retrieve the rendered source image and its ROI.
RenderedImage src = pb.getRenderedSource(0);
Object property = src.getProperty("ROI");
if (property == null
|| property.equals(java.awt.Image.UndefinedProperty)
|| !(property instanceof ROI)) {
return java.awt.Image.UndefinedProperty;
}
// Return undefined also if source ROI is empty.
ROI srcROI = (ROI) property;
if (srcROI.getBounds().isEmpty()) {
return java.awt.Image.UndefinedProperty;
}
// Retrieve the Interpolation object.
Interpolation interp = (Interpolation) pb.getObjectParameter(1);
// Determine the effective source bounds.
Rectangle srcBounds = null;
PlanarImage dst = op.getRendering();
if (dst instanceof GeometricOpImage && ((GeometricOpImage) dst).getBorderExtender() == null) {
srcBounds =
new Rectangle(
src.getMinX() + interp.getLeftPadding(),
src.getMinY() + interp.getTopPadding(),
src.getWidth() - interp.getWidth() + 1,
src.getHeight() - interp.getHeight() + 1);
} else {
srcBounds = new Rectangle(src.getMinX(), src.getMinY(), src.getWidth(), src.getHeight());
}
// If necessary, clip the ROI to the effective source bounds.
if (!srcBounds.contains(srcROI.getBounds())) {
srcROI = srcROI.intersect(new ROIShape(srcBounds));
}
// Retrieve the Warp object.
Warp warp = (Warp) pb.getObjectParameter(0);
// Setting constant image to be warped as a ROI
Rectangle dstBounds = op.getBounds();
// Setting layout of the constant image
ImageLayout2 layout = new ImageLayout2();
int minx = (int) srcBounds.getMinX();
int miny = (int) srcBounds.getMinY();
int w = (int) srcBounds.getWidth();
int h = (int) srcBounds.getHeight();
layout.setMinX(minx);
layout.setMinY(miny);
layout.setWidth(w);
layout.setHeight(h);
RenderingHints hints = op.getRenderingHints();
hints.add(new RenderingHints(JAI.KEY_IMAGE_LAYOUT, layout));
final PlanarImage constantImage =
ConstantDescriptor.create(new Float(w), new Float(h), new Byte[] {(byte) 255}, hints);
PlanarImage roiImage = null;
// Make sure to specify tileCache, tileScheduler, tileRecyclier, by cloning hints.
RenderingHints warpingHints = op.getRenderingHints();
warpingHints.remove(JAI.KEY_IMAGE_LAYOUT);
// Creating warped roi by the same way (Warp, Interpolation, source ROI) we warped the
// input image.
final ParameterBlock paramBlk = new ParameterBlock();
paramBlk.addSource(constantImage);
paramBlk.add(warp);
paramBlk.add(interp);
paramBlk.add(null);
paramBlk.add(srcROI);
// force in the image layout, this way we get exactly the same
// as the affine we're eliminating
Hints localHints = new Hints(op.getRenderingHints());
localHints.remove(JAI.KEY_IMAGE_LAYOUT);
ImageLayout il = new ImageLayout();
il.setMinX(dstBounds.x);
il.setMinY(dstBounds.y);
il.setWidth(dstBounds.width);
il.setHeight(dstBounds.height);
localHints.put(JAI.KEY_IMAGE_LAYOUT, il);
roiImage = JAI.create("Warp", paramBlk, localHints);
ROI dstROI = new ROI(roiImage, 1);
// If necessary, clip the warped ROI to the destination bounds.
if (!dstBounds.contains(dstROI.getBounds())) {
dstROI = dstROI.intersect(new ROIShape(dstBounds));
}
// Return the warped and possibly clipped ROI.
return dstROI;
}
return java.awt.Image.UndefinedProperty;
}