Impala Documentation

void Impala::Core::Feature::Color64::ExtractCorrelogram50	(	BYTE *	pbImage,
		int	nWidth,
		int	nHeight,
		float *	pfFeature
	)			`[inline]`

Definition at line 385 of file Color64.h.

References BYTE, and NormalizeVector().

Referenced by ExtractCorrelogramTextureMoment().

00386     {
00387         float afHistogram[50], afCorrelogram[50];
00388         memset(afHistogram, 0, sizeof(afHistogram));
00389         memset(afCorrelogram, 0, sizeof(afCorrelogram));
00390 
00391         for (int y = 1; y < nHeight - 1; y ++)
00392         {
00393             BYTE* pbCurr = pbImage + y * nWidth;
00394             BYTE* pbPrev = pbCurr - nWidth;
00395             BYTE* pbNext = pbCurr + nWidth;
00396 
00397             for (int x = 1; x < nWidth - 1; x ++)
00398             {
00399                 // Note: nIndex = [0,43]
00400                 int nIndex = pbCurr[x];
00401                 int nCount = (pbPrev[x - 1] == nIndex) + (pbPrev[x] == nIndex) + (pbPrev[x + 1] == nIndex)
00402                            + (pbCurr[x - 1] == nIndex) + (pbCurr[x + 1] == nIndex)
00403                            + (pbNext[x - 1] == nIndex) + (pbNext[x] == nIndex) + (pbNext[x + 1] == nIndex);
00404                 afHistogram[nIndex] ++;
00405                 afCorrelogram[nIndex] += nCount;
00406             }
00407         }
00408 
00409         for (int i = 0; i < 50; i ++)
00410         {
00411             if (afHistogram[i] > 0)
00412             {
00413                 pfFeature[i] = afCorrelogram[i] / afHistogram[i];
00414             }
00415         }
00416         NormalizeVector(pfFeature, 50);
00417     }

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