#include "ltimgkrn.h"
L_LTIMGKRN_API L_INT L_ImgKrnSignalToNoiseRatio(bitmap, ratio)
Finds the signal-to-noise-ratio (SNR) in an image.
Pointer to the bitmap handle referencing the bitmap to be measured.
Pointer to a variable to be updated with the SNR amount.
Value | Meaning |
---|---|
SUCCESS | The function was successful. |
< 1 | An error occurred. Refer to Return Codes. |
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:
To avoid BITMAPHANDLE property fidelity loss, pass a copy of your BITMAPHANDLE to all L_ImgKrn* functions.
Required DLLs and Libraries
Win32, x64, Linux.
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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