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L_ImgKrnSignalToNoiseRatio

#include "ltimgkrn.h"

L_LTIMGKRN_API L_INT L_ImgKrnSignalToNoiseRatio(bitmap, ratio)

Finds the signal-to-noise-ratio (SNR) in an image.

Parameters

BITMAPHANDLE *bitmap

Pointer to the bitmap handle referencing the bitmap to be measured.

L_DOUBLE *ratio

Pointer to a variable to be updated with the SNR amount.

Returns

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

Comments

Calculates the SNR and updates the value of ratio with the 10*log10 of the real ratio. This value gives an indication of the homogeneity of adjacent pixels in an image.

Note: All functions with the L_ImgKrn prefix modify the underlying properties of the input BITMAPHANDLE, including but not limited to:

BitsPerPixel
Order

To avoid BITMAPHANDLE property fidelity loss, pass a copy of your BITMAPHANDLE to all L_ImgKrn* functions.

Required DLLs and Libraries

LTIMGKRN
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.

Functions

Topics

Raster Image Functions: Image Analysis

Example

This example loads a bitmap and finds the signal-to-noise-ratio.

L_INT KrnSignalToNoiseRatioExample(L_VOID) 
{ 
   L_INT ret; 
   BITMAPHANDLE bitmap;   /* Bitmap handle to hold the loaded image. */ 
   L_DOUBLE snr; 
 
   /* Load the bitmap */ 
   ret = L_LoadBitmap(MAKE_IMAGE_PATH(TEXT("cannon.jpg")), &bitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL); 
   if (ret != SUCCESS) 
      return ret; 
 
   /* Apply L_ImgKrnSignalToNoiseRatio and find S/N ratio*/ 
   ret = L_ImgKrnSignalToNoiseRatio(&bitmap, &snr); 
 
   L_FreeBitmap(&bitmap); 
 
   return ret; 
}

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