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L_ApplyModalityLUT

Summary

Remaps the bitmap pixels through a lookup-table (LUT).

Syntax

#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_ApplyModalityLUT (pBitmap, pLUT, pLUTDescriptor, uFlags)

Parameters

pBITMAPHANDLE pBitmap

Pointer to the main bitmap handle.

L_UINT16 *pLUT

Pointer to the lookup table to be applied to the bitmap.

pDICOMLUTDESCRIPTOR pLUTDescriptor

Pointer to a structure describing the LUT parameters.

L_UINT uFlags

A flag that determine the behavior of the function, the user can use one or more flags of the following:

Flags	Meaning
M_LUT_SIGNED	[0x0001] The LUT entries are signed
M_LUT_UPDATE_MIN_MAX	[0x0002] Update MinVal,MaxVal inside the bitmap handle
M_LUT_USE_FULL_RANGE	[0x0004] Do not mask the values in the LUT
M_LUT_ALLOW_RANGE_EXPANSION	[0x0008] Allow the function to increase `pBitmap`->HighBit (if needed) to be able to hold the data range after applying modality LUT.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comment

This function does not support 32-bit grayscale images. It returns the error code ERROR_GRAY32_UNSUPPORTED if a 32-bit grayscale image is passed to this function.

Required DLLs and Libraries

LTIMGCOR
For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64, Linux.

Example

L_INT ApplyModalityLUTExample(L_BOOL  bLinear) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle for the image */ 
 
   // Load the bitmap 
   nRet = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("DICOM\\IMAGE2.dcm")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL); 
   if (nRet != SUCCESS) 
      return nRet; 
 
   if (bLinear) 
   { 
      nRet = L_ApplyLinearModalityLUT(&LeadBitmap, 0.0, 0.5, 0); 
      if (nRet != SUCCESS) 
         return nRet; 
   } 
   else 
   { 
      L_UINT16*            pLUT; 
      L_INT                i; 
      DICOMLUTDESCRIPTOR   LUTDescriptor; 
 
      // allocate and initialize the LUT 
      pLUT = (L_UINT16*)malloc(0x10000 * sizeof(L_UINT16)); 
      if (!pLUT) 
         return ERROR_NO_MEMORY; 
 
      // set a LUT which reduces the intensity of each pixel to half 
      for (i = 0; i <= 0xFFFF; i++) 
         pLUT[i] = i / 2; 
 
      // fill the LUTDescriptor structure 
      LUTDescriptor.uStructSize = sizeof(LUTDescriptor); 
      LUTDescriptor.nFirstStoredPixelValueMapped = 0; 
      LUTDescriptor.uEntryBits = 16; 
      LUTDescriptor.uNumberOfEntries = 0x10000; 
 
      // apply the LUT 
      nRet = L_ApplyModalityLUT(&LeadBitmap, pLUT, &LUTDescriptor, 0); 
      if (nRet != SUCCESS) 
         return nRet; 
 
      // free the LUT 
      free(pLUT); 
   } 
 
   return SUCCESS; 
}