| void Impala::Core::Feature::Color64::ExtractTextureMoment | ( | float * | pfImage, | |
| int | nWidth, | |||
| int | nHeight, | |||
| float * | pfFeature | |||
| ) | [inline] |
Definition at line 419 of file Color64.h.
References NormalizeVector().
Referenced by ExtractCorrelogramTextureMoment().
00420 { 00421 const float fW2 = (float)sqrt(2.0); 00422 for (int y = 1; y < nHeight - 1; y ++) 00423 { 00424 float* pfCurr = pfImage + y * nWidth; 00425 float* pfPrev = pfCurr - nWidth; 00426 float* pfNext = pfCurr + nWidth; 00427 00428 for (int x = 1; x < nWidth - 1; x ++) 00429 { 00430 float af[8]; 00431 00432 af[0] = pfPrev[x - 1] + pfPrev[x] + pfPrev[x + 1] 00433 + pfCurr[x - 1] + pfCurr[x + 1] 00434 + pfNext[x - 1] + pfNext[x] + pfNext[x + 1]; 00435 00436 af[1] = - pfPrev[x - 1] + pfPrev[x] - pfPrev[x + 1] 00437 + pfCurr[x - 1] + pfCurr[x + 1] 00438 - pfNext[x - 1] + pfNext[x] - pfNext[x + 1]; 00439 00440 af[2] = - pfPrev[x - 1] + pfPrev[x + 1] - pfNext[x - 1] + pfNext[x + 1] 00441 + fW2 * (- pfCurr[x - 1] + pfCurr[x + 1]); 00442 00443 af[3] = - pfPrev[x - 1] - pfPrev[x + 1] + pfNext[x - 1] + pfNext[x + 1] 00444 + fW2 * (- pfPrev[x] + pfNext[x]); 00445 00446 af[4] = fW2 * (- pfPrev[x] + pfCurr[x - 1] + pfCurr[x + 1] - pfNext[x]); 00447 00448 af[5] = fW2 * (pfPrev[x - 1] - pfPrev[x + 1] - pfNext[x - 1] + pfNext[x + 1]); 00449 00450 af[6] = pfPrev[x - 1] - pfPrev[x + 1] + pfNext[x - 1] - pfNext[x + 1] 00451 + fW2 * (- pfCurr[x - 1] + pfCurr[x + 1]); 00452 00453 af[7] = - pfPrev[x - 1] - pfPrev[x + 1] + pfNext[x - 1] + pfNext[x + 1] 00454 + fW2 * (pfPrev[x] - pfNext[x]); 00455 00456 /*float fValueNorm = af[0]; 00457 if (fValueNorm < 1e-4f) 00458 { 00459 fValueNorm = 1e-4f; 00460 } 00461 fValueNorm = 1.0f / fValueNorm; 00462 */ 00463 for (int i = 1; i < 8; i ++) 00464 { 00465 //af[i] *= fValueNorm; 00466 pfFeature[i - 1] += fabs(af[i]); 00467 pfFeature[i + 6] += af[i] * af[i]; 00468 } 00469 } 00470 } 00471 00472 float fSizeNorm = 1.0f / ((nWidth - 2) * (nHeight - 2)); 00473 for (int i = 0; i < 7; i ++) 00474 { 00475 pfFeature[i] *= fSizeNorm; 00476 pfFeature[i + 7] = (float)sqrt(fabs(pfFeature[i + 7] * fSizeNorm - pfFeature[i] * pfFeature[i])); 00477 } 00478 NormalizeVector(pfFeature, 14); 00479 }
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