LBitmap::GetStatisticsInfo2

#include "ltwrappr.h"

L_INT LBitmap::GetStatisticsInfo2 (pStatisticsInfo, uChannel, nStart, nEnd)

Returns statistical information about the bitmap.

Parameters

pSTATISTICSINFO pStatisticsInfo

Address of the STATISTICSINFO structure variable to be updated with the image information.

L_UINT uChannel

Flag that indicates the channel for which to get the information. This value is ignored if the bitmap is 12 or 16-bit grayscale. Possible values are:

Value Meaning
CHANNEL_MASTER [0] All channels *.
CHANNEL_RED [1] Red channel only.
CHANNEL_GREEN [2] Green channel only.
CHANNEL_BLUE [3] Blue channel only.

L_INT nStart

Indicates the beginning color value of the range for the evaluation.

L_INT nEnd

Indicates the ending color value of the range for the evaluation.

Returns

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

Comments

This function calculates statistical information about the bitmap.

The nStart and nEnd parameters designate the range of colors that will be taken in consideration for producing the results. Only the values between nStart and nEnd are used for the calculation of the results. The range of each one depends on the bits per pixel of the bitmap:

Support for 12- and 16-bit grayscale and 48- and 64-bit color images is available only in the Document/Medical toolkits.

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

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.

Calculating Master Channel Values

In order to speed up widely used image processing filters in LEADTOOLS, the grayscale value (master channel) of a colored image is calculated using the following formulas:

#define CalcGrayValue(r, g, b) ((L_UCHAR)(((L_UCHAR) (((2 * (L_UINT) (r)) + (5 * (L_UINT) (g)) + (L_UINT) (b) + 4) / 8)))) 
#define CalcGrayValue16(r, g, b) ((L_UINT16) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8)) 
#define CalcGrayValue32(r, g, b) ((L_UINT32) (((2 * (L_UINT32) (r)) + (5 * (L_UINT32) (g)) + (L_UINT32) (b) + 4) / 8)) 

Required DLLs and Libraries

Platforms

Win32, x64.

See Also

Functions

Topics

Example

L_INT LBitmap__GetStatisticsInfo2Example(LBitmap *pLeadBitmap)  
{ 
   L_INT             nRet; 
   STATISTICSINFO    StatisticsInfo;  
 
   /*Get statistical image information */ 
   nRet =pLeadBitmap->GetStatisticsInfo2 (&StatisticsInfo,CHANNEL_MASTER, 0, 255); 
 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
} 
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