L_ApplyModalityLUT

#include "l_bitmap.h"

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

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

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

Platforms

Win32, x64, Linux.

See Also

Functions

Topics

Example

L_INT ApplyModalityLUTExample(pBITMAPHANDLE pBitmap,L_BOOL  bLinear) 
{ 
   L_INT nRet; 
 
   if(bLinear) 
   {    
       nRet = L_ApplyLinearModalityLUT (pBitmap, 0.0, 0.5, 0);  
       if(nRet != SUCCESS) 
          return nRet; 
   } 
   else 
   { 
      L_UINT16             *pLUT;  
      L_UINT16                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(pBitmap, pLUT, &LUTDescriptor, 0); 
      if(nRet != SUCCESS) 
      { 
         return nRet; 
      } 
 
      // free the LUT 
      free(pLUT);    
   } 
   return SUCCESS;  
    
} 
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