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.

See Also

Functions:

L_GlareDetection, L_TextBlurDetector, L_BlurDetection

Topics:

Raster Image Functions: Image Analysis

Processing an Image

 

Removing Noise

Example

This example loads a bitmap and find signal to noise ratio.

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 ; 
} 

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