L_GetMinMaxVal

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#include "l_bitmap.h"

L_LTIMGCOR_API L_INT L_GetMinMaxVal(pBitmap, pMinVal, pMaxVal, uFlags)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_INT *pMinVal;	/* address of the minimum value variable to be updated */
L_INT *pMaxVal;	/* address of the maximum value variable to be updated */
L_UINT32 uFlags;	/* flags */

Returns the minimum and maximum intensity values present in a 12 or 16-bit grayscale and 48 and 64-bit image.

Parameter	Description
pBitmap	Pointer to the bitmap handle of a 12-bit or 16-bit grayscale and 48 and 64-bit bitmap.
pMinVal	Address of a variable that will be updated with the minimum intensity value present in the bitmap.
pMaxVal	Address of a variable that will be updated with the maximum intensity value present in the bitmap.
uFlags	Reserved for future use. Must be 0.

Returns

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

Comments

The minimum and maximum values can be used to create a lookup table, for use in L_WindowLevel or L_WindowLevelBitmap.

For signed bitmaps, the minimum intensity and the maximum intensity values can be negative.

This function supports 12 and 16-bit grayscale. Support for 12 and 16-bit grayscaleimages is available in the Document and Medical Imaging toolkits.

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.

See Also

Functions:	L_GetMinMaxBits, L_WindowLevel, L_WindowLevelBitmap
Topics:	Raster Image Functions: Palettes
	Color Halftone and Halftone Images
	Grayscale Images
	Raster Image Functions: Processing an Image

Example

This example gets the minimum and maximum pixel values for an image.

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName


#if defined (LEADTOOLS_V16_OR_LATER)
 L_INT GetMinMaxValExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle of the image. */
   L_INT  nLow; /* the minimum value */
   L_INT  nHigh; /* the maximum value*/
   /* Load the bitmap, force 24 bits per pixel */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\brain.tif")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   /* get min/max values */
   nRet = L_GetMinMaxVal(&LeadBitmap, &nLow, &nHigh, 0);
   if(nRet !=SUCCESS)
      return nRet;
   //free Bitmap
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap);
   return SUCCESS;
}
#else
 L_INT GetMinMaxValExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle of the image. */
   L_INT  nLow; /* the minimum value */
   L_INT  nHigh; /* the maximum value*/
   /* Load the bitmap, force 24 bits per pixel */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("ImageProcessingDemo\\brain.tif")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGRORGRAY, NULL, NULL);
   if(nRet !=SUCCESS)
      return nRet;
   /* get min/max values */
   nRet = L_GetMinMaxVal(&LeadBitmap, &nLow, &nHigh);
   if(nRet !=SUCCESS)
      return nRet;
   //free Bitmap
   if(LeadBitmap.Flags.Allocated)  
      L_FreeBitmap(&LeadBitmap);
   return SUCCESS;
}
#endif // LEADTOOLS_V16_OR_LATER