C++ Pattern::clean方法代码示例

void Preprocessor::correctSlanting ()
{
	boost::timer timer;
	timer.restart();

	const double PI = 3.1415926535;

	for ( std::vector<Pattern>::iterator i = patterns_.begin(); i != patterns_.end(); ++i )
	{
	    const unsigned int rotationLimit = 20;
		double shearingFactor;;

	    // This vector stores the greatest number of ink pixels counted in any column of a rotated pattern.
		std::vector<unsigned int> columnPixelMaximalCounts(rotationLimit);

		// Rotate the pattern and count the number of ink pixels per column
		for ( double angle = 0; angle < rotationLimit; ++angle )
		{
			std::map<unsigned int, std::set<unsigned int> > pixelsPerColumn;
			shearingFactor = tan(-angle * PI / 180.0);

			// Store the columns of rotated pixels
			for ( unsigned int j = 0; j < i->height(); ++j )
			{
				for ( unsigned int k = 0; k < i->width(); ++k )
				{
					if ( i->at(j,k) == 1 )  // Ink pixel
					{
						double jp = j;
						double kp = k;
						kp = round(kp - jp * shearingFactor);

						if ( kp < i->width() && kp > 0 )
							pixelsPerColumn[kp].insert(j);
					}
				}
			}

			unsigned int columnPixelMaximalCount = 0;
			for ( std::map<unsigned int, std::set<unsigned int> >::iterator row = pixelsPerColumn.begin(); row != pixelsPerColumn.end(); ++row )
			{
				if ( row->second.size() > columnPixelMaximalCount )
					columnPixelMaximalCount = row->second.size();
			}

			columnPixelMaximalCounts.at(angle) = columnPixelMaximalCount;
		}

		// Get the angle to rotate selecting the rotation that generates the maximal number of pixels in a column
		double targetAngle = distance( columnPixelMaximalCounts.begin(), std::max_element(columnPixelMaximalCounts.begin(), columnPixelMaximalCounts.end()) );
		shearingFactor = tan(-targetAngle * PI / 180.0);

		// Correct slanting of the actual pattern
		if ( targetAngle != 0 )
		{
			Pattern rotatedPattern;
			rotatedPattern.clean();

			for ( unsigned int j = 0; j < i->height(); ++j )
			{
				for ( unsigned int k = 0; k < i->width(); ++k )
				{
					if ( i->at(j,k) == 1 )
					{
						double jp = j;
						double kp = k;
						kp = round(kp - jp * shearingFactor);

						if ( kp < i->width() && kp > 0 )
							rotatedPattern.at(jp, kp) = 1;
					}
				}
			}
			*i = rotatedPattern;
		}
	}

	statistics_.slantingCorrectionTime(timer.elapsed());;
}

void Preprocessor::buildPatterns ()
{
	boost::timer timer;
	timer.restart();

	patterns_.clear();
	patterns_.reserve(regions_.size());
	Pattern pattern;

	// Traverse the list of iterators to regions creating a Pattern object for each region
	for( RegionLines::iterator k = inlineRegions_.begin(); k != inlineRegions_.end(); ++k )
	{
		std::list<RegionIterator> line(k->second);
		for( std::list<RegionIterator>::iterator i = line.begin(); i != line.end(); ++i )
		{
			(*i)->normalizeCoordinates();

			// Normalize region using Magick++ facilities
			Magick::Image image( Magick::Geometry((*i)->width(), (*i)->height()), Magick::ColorGray(1.0) );
			image.type( Magick::BilevelType );

			Magick::Pixels view(image);
			Magick::PixelPacket *originPixel = view.get(0, 0, (*i)->width(), (*i)->height());
			Magick::PixelPacket *pixel;

			for ( unsigned int j = 0; j < (*i)->size(); ++j )
			{
				pixel	= originPixel + ((*i)->at(j).first * view.columns() + (*i)->at(j).second);
				*pixel	= Magick::ColorGray (0.0);
			}
			
			view.sync();
			image.syncPixels();
			image.scale( Magick::Geometry(Pattern::planeSize(), Pattern::planeSize()) );

			// Preprocess the normalized region
			Preprocessor temporalPreprocessor (image, 0, 0, image.rows(), image.columns());
			temporalPreprocessor.applyGlobalThresholding();
			temporalPreprocessor.isolateRegions();

			Region normalizedRegion;
			if ( ! temporalPreprocessor.regions_.empty() )
			{
				// Merge subregions if preprocessing split the original region
				if ( temporalPreprocessor.regions_.size() > 1 )
				{
					for ( RegionIterator j = temporalPreprocessor.regions_.begin(); j != temporalPreprocessor.regions_.end(); ++j )
						normalizedRegion = normalizedRegion + *j;

					temporalPreprocessor.regions_.clear();
					temporalPreprocessor.regions_.push_back(normalizedRegion);
				}
				else
					normalizedRegion = temporalPreprocessor.regions_.front();
			}
			
			// Build the pattern
			pattern.clean();
			for ( unsigned int i = 0; i < normalizedRegion.size(); ++i )
				pattern.at(normalizedRegion.at(i).first, normalizedRegion.at(i).second) = 1;

			// Correct shifting
			if ( image.rows() < Pattern::planeSize() )	// Shift rows from top to the center
			{
				unsigned int offset = (Pattern::planeSize() - image.rows()) / 2;

				while ( offset != 0 )
				{
					for ( int i = Pattern::planeSize()-2; i >= 0; --i )
					{
						for ( unsigned int j = 0; j < Pattern::planeSize(); ++j )
							pattern.at(i+1, j) = pattern.at(i, j);
					}
					for ( unsigned int j = 0; j < Pattern::planeSize(); ++j )
						pattern.at(0, j) = 0;

					--offset;
				}
			}

			if ( image.columns() < Pattern::planeSize() )	// Shift columns from left to center
			{
				unsigned int offset = (Pattern::planeSize() - image.columns()) / 2;

				while ( offset != 0 )
				{
					for ( unsigned int i = 0; i < Pattern::planeSize(); ++i )
					{
						for ( int j = Pattern::planeSize()-2; j >= 0; --j )
							pattern.at(i, j+1) = pattern.at(i, j);
					}
					for ( unsigned int i = 0; i < Pattern::planeSize(); ++i )
						pattern.at(i, 0) = 0;

					--offset;
				}
			}

			patterns_.push_back( pattern );
		}
//.........这里部分代码省略.........