public class ApplyModalityLookupTableCommand : RasterCommand
@interface LTApplyModalityLookupTableCommand : LTRasterCommand
public class ApplyModalityLookupTableCommand
extends RasterCommand
public ref class ApplyModalityLookupTableCommand : public RasterCommand
class ApplyModalityLookupTableCommand(RasterCommand):
This command is available in the Document and Medical Imaging toolkits.
This class is similar to RemapIntensityCommand because it remaps the image pixel values through a LookupTable. The class differs from RemapIntensityCommand as follows: ApplyModalityLookupTableCommand allows you to specify an incomplete LookupTable. Values less than the first mapped index will be mapped to the first entry in the palette. Values higher than "first mapped index" + "LookupTable length" will be mapped to the last entry in the LookupTable. ApplyModalityLookupTableCommand only works on grayscale images. ApplyModalityLookupTableCommand can create signed images. The output image will be signed (if ModalityLookupTableCommandFlags.SignedLookupTable is set), or unsigned (ModalityLookupTableCommandFlags.SignedLookupTable is not set).
The values in the LookupTable will be masked such that only the useful bits in the image are considered. The values are considered as if the image pixel values are normalized, LowBit = 0.
For example, let's say the image is: BitsPerPixel = 12 LowBit = 4 HighBit = 10 In this case, there are 10-4+1=7 valid bits. This means that there are 128 values to remap. For every pixel, ApplyModalityLookupTableCommand will do the following:
Take the pixel value, shift it to the right by 4 and mask out the high bits, producing a value (val = 0..127).
For more information, refer to Changing Brightness and Contrast.
Run the ApplyModalityLookupTableCommand on an image.
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing.Core;
public void ApplyModalityLookupTableCommandExample()
{
// Load an image
RasterCodecs codecs = new RasterCodecs();
codecs.ThrowExceptionsOnInvalidImages = true;
RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "IMAGE2.dcm"));
// Prepare the command
int i;
short[] pLookupTable = new short[0x10000];
DicomLookupTableDescriptor LookupTableDescriptor = new DicomLookupTableDescriptor();
// set a LookupTable which reduces the intensity of each pixel to half
for (i = 0; i <= 0xFFFF; i++)
pLookupTable[i] = (short)(i / 2);
// fill the LookupTableDescriptor object
LookupTableDescriptor.FirstStoredPixelValueMapped = 0;
LookupTableDescriptor.EntryBits = 16;
// apply the LookupTable
ApplyModalityLookupTableCommand command = new ApplyModalityLookupTableCommand();
command.Flags = ModalityLookupTableCommandFlags.None;
command.LookupTable = pLookupTable;
command.LookupTableDescriptor = LookupTableDescriptor;
command.Run(image);
}
static class LEAD_VARS
{
public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images";
}
import java.io.File;
import java.io.IOException;
import org.junit.*;
import org.junit.runner.JUnitCore;
import org.junit.runner.Result;
import org.junit.runner.notification.Failure;
import static org.junit.Assert.*;
import leadtools.*;
import leadtools.codecs.*;
import leadtools.imageprocessing.core.*;
public void applyModalityLookupTableCommandExample() {
final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images";
// Load an image
RasterCodecs codecs = new RasterCodecs();
codecs.setThrowExceptionsOnInvalidImages(true);
RasterImage image = codecs.load(combine(LEAD_VARS_IMAGES_DIR, "DICOM\\image2.dcm"));
String outputFileName = combine(LEAD_VARS_IMAGES_DIR, "modality.jpg");
// Prepare the command
int i;
int[] pLookupTable = new int[0x10000];
DicomLookupTableDescriptor lookupTableDescriptor = new DicomLookupTableDescriptor();
// set a LookupTable which reduces the intensity of each pixel to half
for (i = 0; i <= 0xFFFF; i++)
pLookupTable[i] = (short) (i / 2);
// fill the lookupTableDescriptor object
lookupTableDescriptor.setFirstStoredPixelValueMapped(0);
lookupTableDescriptor.setEntryBits(16);
// apply the LookupTable
ApplyModalityLookupTableCommand command = new ApplyModalityLookupTableCommand();
command.setFlags(ModalityLookupTableCommandFlags.NONE.getValue());
command.setLookupTable(pLookupTable);
command.setLookupTableDescriptor(lookupTableDescriptor);
command.run(image);
codecs.save(image, outputFileName, RasterImageFormat.JPEG, 8);
System.out.println("Command run, image saved to " + outputFileName);
assertTrue(new File(outputFileName).exists());
}
ApplyModalityLookupTableCommand Members
Leadtools.ImageProcessing.Core Namespace
Changing Brightness and Contrast
Leadtools.ImageProcessing.Color.RemapIntensityCommand
ApplyLinearModalityLookupTableCommand Class
ApplyVoiLookupTableCommand Class
ApplyLinearVoiLookupTableCommand Class
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Imaging, Medical, and Document
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