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// ¹¹½¨nOctaves×飨ÿ×énOctaves+3²ã£©¸ß˹½ð×ÖËþ  
void SIFT::buildGaussianPyramid( const Mat& base, vector& pyr, int nOctaves ) const  
{  
    vector sig(nOctaveLayers + 3);  
    pyr.resize(nOctaves*(nOctaveLayers + 3));  
  
    // precompute Gaussian sigmas using the following formula:  
    //  \sigma_{total}^2 = \sigma_{i}^2 + \sigma_{i-1}^2¡¢  
    // ¼ÆËã¶ÔͼÏñ×ö²»Í¬³ß¶È¸ß˹ģºýµÄ³ß¶ÈÒò×Ó  
    sig[0] = sigma;  
    double k = pow( 2., 1. / nOctaveLayers );  
    for( int i = 1; i < nOctaveLayers + 3; i++ )  
    {  
        double sig_prev = pow(k, (double)(i-1))*sigma;  
        double sig_total = sig_prev*k;  
        sig = std::sqrt(sig_total*sig_total - sig_prev*sig_prev);  
    }  
  
    for( int o = 0; o < nOctaves; o++ )  
    {  
        // DoG½ð×ÓËþÐèÒªnOctaveLayers+2²ãͼÏñÀ´¼ì²ânOctaves²ã³ß¶È  
        // ËùÒÔ¸ß˹½ð×ÖËþÐèÒªnOctaveLayers+3²ãͼÏñµÃµ½nOctaveLayers+2²ãDoG½ð×ÖËþ  
        for( int i = 0; i < nOctaveLayers + 3; i++ )  
        {  
            // dstΪµÚo×飨Octave£©½ð×ÖËþ  
            Mat& dst = pyr[o*(nOctaveLayers + 3) + i];  
            // µÚ0×éµÚ0²ãΪԭʼͼÏñ  
            if( o == 0  &&  i == 0 )  
                dst = base;  
              
            // base of new octave is halved image from end of previous octave  
            // ÿһ×éµÚ0¸±Í¼ÏñʱÉÏÒ»×éµ¹ÊýµÚÈý·ùͼÏñ¸ôµã²ÉÑùµÃµ½  
            else if( i == 0 )  
            {  
                const Mat& src = pyr[(o-1)*(nOctaveLayers + 3) + nOctaveLayers];  
                resize(src, dst, Size(src.cols/2, src.rows/2),  
                       0, 0, INTER_NEAREST);  
            }  
            // ÿһ×éµÚi¸±Í¼ÏñÊÇÓɵÚi-1¸±Í¼Ïñ½øÐÐsigµÄ¸ß˹ģºýµÃµ½  
            // Ò²¾ÍÊDZ¾×éͼÏñÔÚsigµÄ³ß¶È¿Õ¼äϵÄͼÏñ  
            else  
            {  
                const Mat& src = pyr[o*(nOctaveLayers + 3) + i-1];  
                GaussianBlur(src, dst, Size(), sig, sig);  
            }  
        }  
    }  
}  

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// ¹¹½¨nOctaves×飨ÿ×énOctaves+2²ã£©¸ß˹²î·Ö½ð×ÖËþ  
void SIFT::buildDoGPyramid( const vector& gpyr, vector& dogpyr ) const  
{  
    int nOctaves = (int)gpyr.size()/(nOctaveLayers + 3);  
    dogpyr.resize( nOctaves*(nOctaveLayers + 2) );  
  
    for( int o = 0; o < nOctaves; o++ )  
    {  
        for( int i = 0; i < nOctaveLayers + 2; i++ )  
        {  
            // µÚo×éµÚi¸±Í¼ÏñΪ¸ß˹½ð×ÖËþÖеÚo×éµÚi+1ºÍi×éͼÏñÏà¼õµÃµ½  
            const Mat& src1 = gpyr[o*(nOctaveLayers + 3) + i];  
            const Mat& src2 = gpyr[o*(nOctaveLayers + 3) + i + 1];  
            Mat& dst = dogpyr[o*(nOctaveLayers + 2) + i];  
            subtract(src2, src1, dst, noArray(), CV_16S);  
        }  
    }  
}  
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