L_GetMinMaxVal

#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.

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; 
} 

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