Available in LEADTOOLS Medical Imaging toolkits. |
#include "ltwrappr.h"
virtual L_INT LBitmap::WindowLevelBitmap(nLowBit, nHighBit, pLUT, uLUTLength, nOrderDst, uFlags = 0)
L_INT nLowBit; |
/* low bit to use */ |
L_INT nHighBit; |
/* high bit to use */ |
RGBQUAD * pLUT; |
/* lookup table */ |
L_UINT uLUTLength; |
/* number of entries */ |
L_INT nOrderDst; |
/* destination color order */ |
L_UINT32 uFlags; |
/* flags*/ |
Converts a 12 or 16-bit grayscale image to an 8-bit grayscale or a 24-bit RGB bitmap.
Parameter |
Description |
|
nLowBit |
Value indicating the low bit used for leveling. 0 <= nLowBit <= nHighBit <= (11 for 12-bit grayscale or 15 for 16-bit grayscale). |
|
nHighBit |
Value indicating the high bit used for leveling. 0 <= nLowBit <= nHighBit <= (11 for 12-bit grayscale or 15 for 16-bit grayscale). |
|
pLUT |
Optional lookup table that can be used to implement a user defined conversion. For every intensity value between 0 and 2 raised to the power of (nHighBit - nLowBit + 1)-1 there should be a corresponding entry in the lookup table that contains an RGB quad. If pLUT is NULL, the conversion is a normal shift (right or left) and the painted bitmap is 8-bit grayscale. If pLUT is not NULL, the painted bitmap is a 24-bit bitmap. |
|
uLUTLength |
Value indicating the number of entries pointed to by pLUT. |
|
nOrderDst |
Value indicating the color order if the output bitmap will be 24-bit. If pLUT is NULL, this parameter is ignored. Possible values are: |
|
|
Value |
Meaning |
|
ORDER_RGB |
[0] The input colors are in red-green-blue order. |
|
ORDER_BGR |
[1] The input colors are in blue-green-red order. |
uFlags |
Reserved for future use. Must be 0. |
Returns
SUCCESS |
The function was successful. |
< 1 |
An error occurred. Refer to Return Codes. |
Comments
This function will convert the class object's bitmap to a window leveled bitmap. To implement window leveling without affecting the image, use LBitmap::WindowLevel.
The bitmap data is changed by this function.
This function supports 12 and 16-bit grayscale. Support for 12 and 16-bit grayscale images is available only in the Document/Medical toolkits.
This function supports signed data images.
LEADTOOLS supports two types of LUTs for 10-16-bit grayscale images (8-bit LUT and 16-bit LUT). Typical grayscale image display and processing is done using an 8-bit LUT. But, you can also use a 16-bit LUT, which offers more precision. Some special video cards and monitors also support display of grayscale images using a 16-bit LUT.
For information on saving bitmaps that have been window leveled, refer to Saving Window-Leveled Bitmaps.
Required DLLs and Libraries
LTDIS For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application. |
Win32, x64.
See Also
Functions: |
LBitmap::WindowLevelBitmapExt, LBitmap::WindowLevel, LBitmap::WindowLevelExt, Class Members |
Topics: |
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Example
This example window levels the bitmap with a custom palette. The image data is changed in this example.
L_INT LBitmap__WindowLevelBitmapExample() { L_UINT32 x; L_INT nLowBit; L_INT nHighBit; L_INT nLow; L_INT nHigh; L_UINT32 nSize; RGBQUAD * ptmp; RGBQUAD * pLUT; LBitmap LeadBitmap; /* Change the bitmap to 16-bit grayscale */ LeadBitmap.GrayScale(16 ); LeadBitmap.GetMinMaxBits(&nLowBit, &nHighBit); LeadBitmap.GetMinMaxVal(&nLow, &nHigh); nSize = (L_UINT32)(1L<<(nHighBit - nLowBit + 1)); pLUT = (RGBQUAD *)GlobalAlloc(GHND, nSize * sizeof(RGBQUAD)); ptmp = pLUT; /* fill the first half of the LUT with RED */ for(x=0;x<nSize/2;x++) { ptmp->rgbRed = 255; ptmp->rgbGreen = 0; ptmp->rgbBlue = 0; ptmp->rgbReserved = 0; ptmp++; } /* fill the rest with gray values */ for(x=nSize/2;x<nSize;x++) { ptmp->rgbRed = ((L_UCHAR) ((L_UINT32) (x - nLow) * 255 / (nHigh - nLow))); ptmp->rgbGreen = ptmp->rgbRed; ptmp->rgbBlue = ptmp->rgbGreen; ptmp->rgbReserved = 0; ptmp++; } LeadBitmap.WindowLevel(nLowBit, nHighBit, (RGBQUAD *)pLUT, nSize, ORDER_BGR); GlobalFreePtr(pLUT); return SUCCESS; }