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lsgrmSplitter.txx 4.64 KiB
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#ifndef __LSGRM_SPLITTER_TXX
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#define __LSGRM_SPLITTER_TXX
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namespace lsgrm
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{
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	template <class TInputImage>
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	void SplitOTBImage(const std::string& inputImagePath, // Path to the input image
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					   const std::string& ouputDirectoryPath, // Path to the directory storing the tiles
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					   unsigned int& tileWidth, // width of the tile
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					   unsigned int& tileHeight, // height of the tile
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					   const unsigned int margin, // stability margin
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					   const unsigned int niter)
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	{
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		/* Some convenient typedefs to short the code. */
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		using ImageType = TInputImage;
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		using InternalPixelType = typename ImageType::InternalPixelType;
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		using Extractor = otb::MultiChannelExtractROI<InternalPixelType, InternalPixelType>;
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		using Reader = otb::ImageFileReader<ImageType>;
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		using Writer = otb::ImageFileWriter<ImageType>;
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		/* Read the input image and update information about its dimension */
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		auto reader = Reader::New();
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		reader->SetFileName(inputImagePath);
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		reader->UpdateOutputInformation();
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		auto imagePtr = reader->GetOutput();
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		auto imageWidth = imagePtr->GetLargestPossibleRegion().GetSize()[0];
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		auto imageHeight = imagePtr->GetLargestPossibleRegion().GetSize()[1];
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		auto imageBands = imagePtr->GetNumberOfComponentsPerPixel();
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		if(tileWidth + 2*margin >= imageWidth || tileHeight + 2* margin >= imageHeight)
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		{
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			std::cout << "One dimension of the tile is greater than the image" << std::endl;
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			exit(1);
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		}
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		// Determine final size of the tiles according to the dimension of the image
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		unsigned int k = std::ceil(imageWidth / tileWidth);
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		while(imageWidth % k)
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			k++;
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		tileWidth = imageWidth / k;
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		assert(tileWidth > 0);
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		k = std::ceil(imageHeight / tileHeight);
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		while(imageWidth % k)
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			k++;
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		tileHeight = imageHeight / k;
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		assert(tileHeight > 0);
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		/* Determine the number of tiles according to the tile dimension given by the user. */
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		const unsigned int nbTilesX = imageWidth / tileWidth + ( imageWidth % tileWidth > 0 ? 1 : 0);
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		const unsigned int nbTilesY = imageHeight / tileHeight + ( imageHeight % tileHeight > 0 ? 1 : 0);
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		/* Open text file to record general parameters for the LSGRM library. */
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		std::ofstream lsgrmLog(ouputDirectoryPath + "info.txt");
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		assert(lsgrmLog.good());
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		lsgrmLog << "Image width:"<< imageWidth << "\n"
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				 << "Image height:"<< imageHeight << "\n"
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				 << "Number of bands:"<< imageBands << "\n"
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				 << "Number of tiles according to X:" << nbTilesX << "\n"
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				 << "Number of tiles according to Y:" << nbTilesY << "\n"
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				 << "Tile width:" << tileWidth << "\n"
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				 << "Tile height:" << tileHeight << "\n"
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				 << "Stability Margin value:" << margin << "\n"
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				 << "Number of iterations: " << niter << "\n";
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		/* Local variables for the next loop */
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		unsigned int startX, startY; // Upper left coordinates of the tile.
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		unsigned int sizeX, sizeY; // Size of the tiles.
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/* Loop over the tiles*/ for(unsigned int row = 0; row < nbTilesY; ++row) { for(unsigned int col = 0; col < nbTilesX; ++col) { startX = col * tileWidth; startY = row * tileHeight; sizeX = std::min(tileWidth, static_cast<unsigned int>(imageWidth - startX)); sizeY = std::min(tileHeight, static_cast<unsigned int>(imageHeight - startY)); lsgrmLog << "Tile " << row*nbTilesY + col << ":" << startX << "," << startY << "," << sizeX << "," << sizeY << ","; /* Margin at the top ? */ if( row > 0 ) { startY -= margin; sizeY += margin; lsgrmLog << "1,"; }else lsgrmLog << "0,"; /* Margin at the right */ if( col < nbTilesX - 1 ) { sizeX += margin; lsgrmLog << "1,"; } else lsgrmLog << "0,"; /* Margin at the bottom */ if( row < nbTilesY - 1) { sizeY += margin; lsgrmLog << "1,"; } else lsgrmLog << "0,"; /* Margin at the left */ if( col > 0 ) { startX -= margin; sizeX += margin; lsgrmLog << "1\n"; } else lsgrmLog << "0\n"; /* Extract the tile */ auto extractPtr = Extractor::New(); extractPtr->SetStartX(startX); extractPtr->SetStartY(startY); extractPtr->SetSizeX(sizeX); extractPtr->SetSizeY(sizeY); /* Write the tile to the ouput directory. */ auto writer = Writer::New(); writer->SetFileName(ouputDirectoryPath + "tile_" + std::to_string(row) + "_" + std::to_string(col) + ".tif"); /* OTB streaming pipeline */ extractPtr->SetInput(reader->GetOutput()); writer->SetInput(extractPtr->GetOutput()); writer->Update(); } // end for(unsigned int col = 0; col < nbTilesX; ++col)
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} // for(unsigned int row = 0; row < nbTilesY; ++row) /* Close the lsgrm info file. */ lsgrmLog.close(); } } // end of namespace lsgrm #endif