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		<site>sibgrapi.sid.inpe.br 802</site>
		<citationkey>HigaRebeSantGuti:2007:CoThDi</citationkey>
		<author>Higa, Mauricio,</author>
		<author>Rebelo, Marina de Sá,</author>
		<author>Santos, Carlos da Silva,</author>
		<author>Gutierrez, Marco Antonio,</author>
		<affiliation>Polytechnic School - University of São Paulo</affiliation>
		<affiliation>Heart Institute (InCor) - Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo</affiliation>
		<affiliation>Institute of Mathematics and Statistics - University of São Paulo</affiliation>
		<affiliation>Heart Institute (InCor) - Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo and Polytechnic School - University of São Paulo</affiliation>
		<title>Comparison of Three Different Derivative Approaches Aiming at Estimation of Image Movement</title>
		<conferencename>Brazilian Symposium on Computer Graphics and Image Processing, 20 (SIBGRAPI)</conferencename>
		<year>2007</year>
		<editor>Gonçalves, Luiz,</editor>
		<editor>Wu, Shin Ting,</editor>
		<booktitle>Proceedings</booktitle>
		<date>Oct. 7-10, 2007</date>
		<publisheraddress>Porto Alegre</publisheraddress>
		<publisher>Sociedade Brasileira de Computação</publisher>
		<conferencelocation>Belo Horizonte</conferencelocation>
		<keywords>cardiac movement, image derivatives, optical flow, velocity components.</keywords>
		<abstract>The use of optical flow techniques to extract the velocity from the cardiac movement has to take into account the computational inaccuracy raised from the derivative operator over discrete data. This study presents a comparison of three different derivative approaches (two based on linear and other based on non-linear filtering) to find out the best solution. Results of the experiments are compared using a structural distortion based image quality metric.</abstract>
		<language>en</language>
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		<targetfile>Sibgrapi07_Comparison3Derivative_RevA.pdf</targetfile>
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