L_SignalToNoiseRatio

#include "Ltimgcor.h"

L_LTIMGCOR_API L_INT L_SignalToNoiseRatio(pBitmap, SNR)

pBITMAPHANDLE pBitmap;	pointer to the bitmap handle
L_FLOAT* SNR;	pointer to L_FLOAT that will be filled with the Signal To Noise (SNR) value

Calculates the Signal To Noise Ratio (SNR) as the 10*log10 of the real value. This value gives an indication of the homogeneity of adjacent pixels in an image.

Parameter	Description
pBitmap	Pointer to the bitmap handle referencing the bitmap to be measured.
SNR	Pointer to L_FLOAT that will be filled with the SNR value.

Returns

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

Comments

Calculates the SNR as the 10*log10 of the real value. This value gives an indication of the homogeneity of adjacent pixels in an image.

This function can only process entire images. It does not support regions.

This function supports 24- and 36-bit color images and 8-bit grayscale images.

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.

Example

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName 
L_INT SignalToNoiseRatioExample(L_VOID) 
{ 
   L_INT nRet; 
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */ 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("cannon.jpg")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
   /* Apply L_SignalToNoiseRatio and find S/N ratio*/ 
   L_FLOAT SNR ; 
   L_SignalToNoiseRatio(&LeadBitmap, &SNR) ; 
   if(nRet !=SUCCESS) 
      return nRet ; 
   //free bitmap 
   if(LeadBitmap.Flags.Allocated) 
      L_FreeBitmap(&LeadBitmap) ; 
   return SUCCESS ; 
}

Help Version 19.0.2017.10.27

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LEADTOOLS Raster Imaging C API Help

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LEADTOOLS Raster Imaging Features

Redistributables/Files To Be Included With Your Application

Functions:	L_GlareDetection, L_TextBlurDetector, L_BlurDetection
Topics:	Raster Image Functions: Image Analysis
	Processing an Image
	Removing Noise