C++ CImage::extract_patch方法代码示例

//.........这里部分代码省略.........
		tictac.Tic();
#endif
		std::vector<cv::Point2f> points;
		cv::goodFeaturesToTrack(
			cGrey,points, nPts, 
			(double)options.harrisOptions.threshold,    // for rejecting weak local maxima ( with min_eig < threshold*max(eig_image) )
			(double)options.harrisOptions.min_distance, // minimum distance between features
			cv::noArray(), // mask
			3, // blocksize
			use_harris, /* harris */
			options.harrisOptions.k 
			);
#ifdef VERBOSE_TIMING
		cout << "[KLT] Find feats: " << tictac.Tac()*1000.0f << endl;
#endif

		if( nDesiredFeatures > 0 && count < nPts )
			cout << "\n[WARNING][selectGoodFeaturesKLT]: Only " << count << " of " << nDesiredFeatures << " points could be extracted in the image." << endl;

		if( options.FIND_SUBPIXEL )
		{
#ifdef VERBOSE_TIMING
			tictac.Tic();
#endif
			// Subpixel interpolation
			cv::cornerSubPix(cGrey,points,
				cv::Size(3,3), cv::Size(-1,-1),
				cv::TermCriteria( CV_TERMCRIT_ITER|CV_TERMCRIT_EPS, 10, 0.05 ));

#ifdef VERBOSE_TIMING
			cout << "[KLT] subpixel: " << tictac.Tac()*1000.0f << endl;
#endif
		}

		// -----------------------------------------------------------------
		// Fill output structure
		// -----------------------------------------------------------------
#ifdef VERBOSE_TIMING
		tictac.Tic();
#endif

		feats.clear();
		unsigned int	borderFeats = 0;
		unsigned int	nCFeats		= init_ID;
		int				i			= 0;
		const int		limit		= min( nPts, count );
		int				offset		= (int)this->options.patchSize/2 + 1;
		unsigned int	imgH		= inImg.getHeight();
		unsigned int	imgW		= inImg.getWidth();

		while( i < limit )
		{
			const int xBorderInf = (int)floor( points[i].x - options.patchSize/2 );
			const int xBorderSup = (int)floor( points[i].x + options.patchSize/2 );
			const int yBorderInf = (int)floor( points[i].y - options.patchSize/2 );
			const int yBorderSup = (int)floor( points[i].y + options.patchSize/2 );

			if( options.patchSize==0 || ( (xBorderSup < (int)imgW) && (xBorderInf > 0) && (yBorderSup < (int)imgH) && (yBorderInf > 0) ) )
			{
				CFeaturePtr ft = CFeature::Create();

				ft->type		= featKLT;
				ft->x			= points[i].x;				// X position
				ft->y			= points[i].y;				// Y position
				ft->track_status = status_TRACKED;		    // Feature Status
				ft->response	= 0.0;						// A value proportional to the quality of the feature (unused yet)
				ft->ID			= nCFeats++;				// Feature ID into extraction
				ft->patchSize	= options.patchSize;		// The size of the feature patch

				if( options.patchSize > 0 )
				{
					inImg.extract_patch(
						ft->patch,
						round( ft->x ) - offset,
						round( ft->y ) - offset,
						options.patchSize,
						options.patchSize );				// Image patch surronding the feature
				}

				feats.push_back( ft );

			} // end if
			else
				borderFeats++;

			i++;
		} // end while

#ifdef VERBOSE_TIMING
		cout << "[KLT] Create output: " << tictac.Tac()*1000.0f << endl;
#endif


		#else
			THROW_EXCEPTION("The MRPT has been compiled with MRPT_HAS_OPENCV=0 !");
		#endif

		MRPT_END

} // end of function

//.........这里部分代码省略.........
	}
	else
	{
		for (size_t i=0;i<N;i++)
			corners[i].response = 0;
	}

	//  2) Filter by "min-distance" (in options.FASTOptions.min_distance)
	//  3) Convert to MRPT CFeatureList format.
	// Steps 2 & 3 are done together in the while() below.
	// The "min-distance" filter is done by means of a 2D binary matrix where each cell is marked when one
	// feature falls within it. This is not exactly the same than a pure "min-distance" but is pretty close
	// and for large numbers of features is much faster than brute force search of kd-trees.
	// (An intermediate approach would be the creation of a mask image updated for each accepted feature, etc.)

	const bool do_filter_min_dist = options.FASTOptions.min_distance>1;

	// Used half the min-distance since we'll later mark as occupied the ranges [i-1,i+1] for a feature at "i"
	const unsigned int occupied_grid_cell_size = options.FASTOptions.min_distance/2.0;
	const float occupied_grid_cell_size_inv = 1.0f/occupied_grid_cell_size;

	unsigned int grid_lx = !do_filter_min_dist ? 1 : (unsigned int)(1 + inImg.getWidth() * occupied_grid_cell_size_inv);
	unsigned int grid_ly = !do_filter_min_dist ? 1 : (unsigned int)(1 + inImg.getHeight() * occupied_grid_cell_size_inv );

	mrpt::math::CMatrixBool  occupied_sections(grid_lx,grid_ly);  // See the comments above for an explanation.
	occupied_sections.fillAll(false);


	unsigned int	nMax		= (nDesiredFeatures!=0 && N > nDesiredFeatures) ? nDesiredFeatures : N;
	const int 		offset		= (int)this->options.patchSize/2 + 1;
	const int		size_2		= options.patchSize/2;
	const size_t 	imgH		= inImg.getHeight();
	const size_t 	imgW		= inImg.getWidth();
	unsigned int	i			= 0;
	unsigned int	cont		= 0;
	TFeatureID		nextID		= init_ID;

    if( !options.addNewFeatures )
        feats.clear();


	while( cont != nMax && i!=N )
	{
		// Take the next feature fromt the ordered list of good features:
		const TSimpleFeature &feat = corners[ sorted_indices[i] ];
		i++;

		// Patch out of the image??
		const int xBorderInf =  feat.pt.x - size_2;
		const int xBorderSup =  feat.pt.x + size_2;
		const int yBorderInf =  feat.pt.y - size_2;
		const int yBorderSup =  feat.pt.y + size_2;

		if (!( xBorderSup < (int)imgW && xBorderInf > 0 && yBorderSup < (int)imgH && yBorderInf > 0 ))
			continue; // nope, skip.

		if (do_filter_min_dist)
		{
			// Check the min-distance:
			const size_t section_idx_x = size_t(feat.pt.x * occupied_grid_cell_size_inv);
			const size_t section_idx_y = size_t(feat.pt.y * occupied_grid_cell_size_inv);

			if (occupied_sections(section_idx_x,section_idx_y))
				continue; // Already occupied! skip.

			// Mark section as occupied
			occupied_sections.set_unsafe(section_idx_x,section_idx_y, true);
			if (section_idx_x>0)	occupied_sections.set_unsafe(section_idx_x-1,section_idx_y, true);
			if (section_idx_y>0)	occupied_sections.set_unsafe(section_idx_x,section_idx_y-1, true);
			if (section_idx_x<grid_lx-1)	occupied_sections.set_unsafe(section_idx_x+1,section_idx_y, true);
			if (section_idx_y<grid_ly-1)	occupied_sections.set_unsafe(section_idx_x,section_idx_y+1, true);
		}

		// All tests passed: add new feature:
		CFeaturePtr ft		= CFeature::Create();
		ft->type			= type_of_this_feature;
		ft->ID				= nextID++;
		ft->x				= feat.pt.x;
		ft->y				= feat.pt.y;
		ft->response		= feat.response;
		ft->orientation		= 0;
		ft->scale			= 1;
		ft->patchSize		= options.patchSize;		// The size of the feature patch

		if( options.patchSize > 0 )
		{
			inImg.extract_patch(
				ft->patch,
				round( ft->x ) - offset,
				round( ft->y ) - offset,
				options.patchSize,
				options.patchSize );						// Image patch surronding the feature
		}
		feats.push_back( ft );
		++cont;
	}

#endif
	MRPT_END
}

/************************************************************************************************
*								extractFeaturesSURF  									        *
************************************************************************************************/
void  CFeatureExtraction::extractFeaturesSURF(
		const mrpt::utils::CImage		&inImg,
		CFeatureList			&feats,
		unsigned int			init_ID,
		unsigned int			nDesiredFeatures,
		const TImageROI			&ROI) const
{
	MRPT_UNUSED_PARAM(ROI);
#if MRPT_HAS_OPENCV && MRPT_OPENCV_VERSION_NUM >= 0x111

	const CImage img_grayscale(inImg, FAST_REF_OR_CONVERT_TO_GRAY);
	const IplImage* cGrey = img_grayscale.getAs<IplImage>();

	CvSeq *kp	=	NULL;
	CvSeq *desc	=	NULL;
	CvMemStorage *storage = cvCreateMemStorage(0);

	// Extract the SURF points:
	CvSURFParams surf_params = cvSURFParams(options.SURFOptions.hessianThreshold, options.SURFOptions.rotation_invariant ? 1:0);
	surf_params.nOctaves = options.SURFOptions.nOctaves;
	surf_params.nOctaveLayers = options.SURFOptions.nLayersPerOctave;

	cvExtractSURF( cGrey, NULL, &kp, &desc, storage, surf_params);

	// -----------------------------------------------------------------
	// MRPT Wrapping
	// -----------------------------------------------------------------
	feats.clear();
	unsigned int	nCFeats		= init_ID;
	int				limit;
	int				offset		= (int)this->options.patchSize/2 + 1;
	unsigned int	imgH		= inImg.getHeight();
	unsigned int	imgW		= inImg.getWidth();

	if( nDesiredFeatures == 0 )
		limit = kp->total;
	else
		limit = (int)nDesiredFeatures < kp->total ? (int)nDesiredFeatures : kp->total;

	for( int i = 0; i < limit; i++ )
	{
		// Get the OpenCV SURF point
		CvSURFPoint *point;
		CFeaturePtr ft = CFeature::Create();
		point = (CvSURFPoint*)cvGetSeqElem( kp, i );

		const int xBorderInf = (int)floor( point->pt.x - options.patchSize/2 );
		const int xBorderSup = (int)floor( point->pt.x + options.patchSize/2 );
		const int yBorderInf = (int)floor( point->pt.y - options.patchSize/2 );
		const int yBorderSup = (int)floor( point->pt.y + options.patchSize/2 );

		if( options.patchSize == 0 || ( (xBorderSup < (int)imgW) && (xBorderInf > 0) && (yBorderSup < (int)imgH) && (yBorderInf > 0) ) )
		{
			ft->type		= featSURF;
			ft->x			= point->pt.x;				// X position
			ft->y			= point->pt.y;				// Y position
			ft->orientation = point->dir;				// Orientation
			ft->scale		= point->size*1.2/9;		// Scale
			ft->ID			= nCFeats++;				// Feature ID into extraction
			ft->patchSize	= options.patchSize;		// The size of the feature patch

			if( options.patchSize > 0 )
			{
				inImg.extract_patch(
					ft->patch,
					round( ft->x ) - offset,
					round( ft->y ) - offset,
					options.patchSize,
					options.patchSize );				// Image patch surronding the feature
			}

			// Get the SURF descriptor
			float* d = (float*)cvGetSeqElem( desc, i );
			ft->descriptors.SURF.resize( options.SURFOptions.rotation_invariant ? 128 : 64 );
			std::vector<float>::iterator itDesc;
			unsigned int k;

			for( k = 0, itDesc = ft->descriptors.SURF.begin(); k < ft->descriptors.SURF.size(); k++, itDesc++ )
				*itDesc = d[k];

			feats.push_back( ft );

		} // end if
	} // end for

	cvReleaseMemStorage(&storage); // Free memory

#else
	THROW_EXCEPTION("Method not available since either MRPT has been compiled without OpenCV or OpenCV version is incorrect (Required 1.1.0)")
#endif //MRPT_HAS_OPENCV
} // end extractFeaturesSURF

//.........这里部分代码省略.........
		{
#ifdef VERBOSE_TIMING
			tictac.Tic();
#endif
			cvGoodFeaturesToTrack( cGrey, eig, temp, &points[0], &count,	// input and output data
				(double)options.KLTOptions.threshold,						// for rejecting weak local maxima ( with min_eig < threshold*max(eig_image) )
				(double)options.KLTOptions.min_distance,					// minimum distance between features
				mask ? (*mask) : static_cast<const CvMat*>(NULL),			// ROI
				options.KLTOptions.radius,									// size of the block of pixels used
				0,															// use Kanade Lucas Tomasi
				0.04 );														// un-used parameter
#ifdef VERBOSE_TIMING
			cout << "[KLT]: Find feats: " << tictac.Tac()*1000.0f << endl;
#endif
		}

		if( nDesiredFeatures > 0 && count < nPts )
			cout << "\n[WARNING][selectGoodFeaturesKLT]: Only " << count << " of " << nDesiredFeatures << " points could be extracted in the image." << endl;

		if( options.FIND_SUBPIXEL )
		{
#ifdef VERBOSE_TIMING
			tictac.Tic();
#endif
			// Subpixel interpolation
			cvFindCornerSubPix( cGrey, &points[0], count,
				cvSize(3,3), cvSize(-1,-1),
				cvTermCriteria( CV_TERMCRIT_ITER|CV_TERMCRIT_EPS, 10, 0.05 ));

#ifdef VERBOSE_TIMING
			cout << "[KLT] subpixel: " << tictac.Tac()*1000.0f << endl;
#endif
		}

		// -----------------------------------------------------------------
		// Fill output structure
		// -----------------------------------------------------------------
#ifdef VERBOSE_TIMING
		tictac.Tic();
#endif

		feats.clear();
		unsigned int	borderFeats = 0;
		unsigned int	nCFeats		= init_ID;
		int				i			= 0;
		const int		limit		= min( nPts, count );
		int				offset		= (int)this->options.patchSize/2 + 1;
		unsigned int	imgH		= inImg.getHeight();
		unsigned int	imgW		= inImg.getWidth();

		while( i < limit )
		{
			const int xBorderInf = (int)floor( points[i].x - options.patchSize/2 );
			const int xBorderSup = (int)floor( points[i].x + options.patchSize/2 );
			const int yBorderInf = (int)floor( points[i].y - options.patchSize/2 );
			const int yBorderSup = (int)floor( points[i].y + options.patchSize/2 );

			if( options.patchSize==0 || ( (xBorderSup < (int)imgW) && (xBorderInf > 0) && (yBorderSup < (int)imgH) && (yBorderInf > 0) ) )
			{
				CFeaturePtr ft = CFeature::Create();

				ft->type		= featKLT;
				ft->x			= points[i].x;				// X position
				ft->y			= points[i].y;				// Y position
				ft->track_status = status_TRACKED;		    // Feature Status
				ft->response	= 0.0;						// A value proportional to the quality of the feature (unused yet)
				ft->ID			= nCFeats++;				// Feature ID into extraction
				ft->patchSize	= options.patchSize;		// The size of the feature patch

				if( options.patchSize > 0 )
				{
					inImg.extract_patch(
						ft->patch,
						round( ft->x ) - offset,
						round( ft->y ) - offset,
						options.patchSize,
						options.patchSize );				// Image patch surronding the feature
				}

				feats.push_back( ft );

			} // end if
			else
				borderFeats++;

			i++;
		} // end while

#ifdef VERBOSE_TIMING
		cout << "[KLT] Create output: " << tictac.Tac()*1000.0f << endl;
#endif


		#else
			THROW_EXCEPTION("The MRPT has been compiled with MRPT_HAS_OPENCV=0 !");
		#endif

		MRPT_END

} // end of function