A biologically inspired optical flow system for motion detection and object identification

The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.Title from title screen of research.pdf file (viewed on April 7, 2008)Includes bibliographical references.Thesis (M.S.) University of Missouri-Columbia 2007.Dissertations, Academic -- University of Missouri--Columbia -- Electrical and computer engineering.Optical flow is possibly the best known method for motion segmentation. However its application is restricted to offline processing as it requires extensive computational resources and time. This thesis explores an optical flow method derived from observation on vision system of diptereous insect. The proposed method , Biological Optical flow (BioOF) was implemented using series of first order filters, and, therefore is much faster than any existing machine coded optical flow algorithm beside being hardware implement able. Like other optical flow methods, the output of proposed BioOF has two components: horizontal optical flow and vertical optical flow; both of them can be combined in order to get a better final result in terms of motion segmentation. Unfortunately, this combined output of the BioOF can be heavily coupled with noise. So, in order to remove the noise, intensive image processing had to be performed. The result was an algorithm that can provide a good contour of the segmented object in an image. Finally the object contour is converted to a Fourier feature space leading to a representation that is rotational and translational invariant. Over this feature space various classification algorithms including SVM, feature subset forward selection, Scatter matrix, and a simple linear classifier using principal component analysis and Mahanabolis distance were investigated

Dynamism of a dog on a leash’ or behavior classification by eigen-decomposition of periodic motions

Abstract. Following Futurism, we show how periodic motions can be represented by a small number of eigen-shapes that capture the whole dynamic mechanism of periodic motions. Spectral decomposition of a silhouette of an object in motion serves as a basis for behavior classification by principle component analysis. The boundary contour of the walking dog, for example, is first computed efficiently and accurately. After normalization, the implicit representation of a sequence of silhouette contours given by their corresponding binary images, is used for generating eigen-shapes for the given motion. Singular value decomposition produces these eigen-shapes that are then used to analyze the sequence. We show examples of object as well as behavior classification based on the eigen-decomposition of the binary silhouette sequence.

Nuyoricans

Die Dissertation ist ein Beitrag zur Debatte um die Revision des amerikanistischen Lektürekanons. Ihre drei Schwerpunkte sind die Geschichte und Mythologie der Karibikinsel Puerto Rico, die soziale Lage und das Image der Puertoricaner in den USA sowie die auf Englisch erschienene Erzählliteratur von Autoren puertoricanischer Herkunft. (1) Die spanische Kolonie Puerto Rico kam 1898 in den Besitz der USA und erlebte in der zweiten Hälfte des 20. Jahrhunderts einen rasanten ökonomischen Aufstieg, der mit wachsender Abhängigkeit vom amerikanischen Wohlfahrtsstaat erkauft ist. In freien Referenden bejahte jeweils eine knappe Mehrheit den Zwitterstatus ihrer Insel, die bis heute weder ein Staat der USA noch ein souveränes Land ist. Da jedoch der Kongress in Washington über die Zukunft des Commonwealth of Puerto Rico zu bestimmen hat, bleibt die Insel eine Kolonie der USA. Puerto Ricos Mythologie ist von Stereotypen geprägt, die sich zu einem negativen Klischee vom Nationalcharakter des Landes verdichtet haben. Die amerikanische Dominanz in Politik, Wirtschaft und Kultur verstärkt die von vielen beklagte Schizophrenie Puerto Ricos. Die Chance einer Lösung des puertoricanischen Syndroms verspricht nur die nationale Unabhängigkeit. (2) Stereotype bestimmen auch das Bild von den übergesiedelten Puertoricanern, den Nuyoricans, in der Öffentlichkeit der USA. Das Negativimage der kaum assimilierten Gruppe wird von den Massenmedien verfestigt, obwohl seriöse Studien zeigen, dass frühere Immigranten ähnliche Probleme mit sich brachten. Die Mehrheit der US-Experten propagiert nach wie vor die allmähliche Assimilation der Übersiedler im Rahmen eines kulturellen Pluralismus. Bei den Puertoricanern geht der Trend seit dem Aufkommen des Multikulturalismus in Richtung einer hybriden, bikulturellen Identität, in ein Wort gefasst mit dem Begriff Nuyorican. Die Dissertation bietet eine Auswertung der auf Englisch erschienenen Literatur über die Puertoricaner in den USA unter 15 Aspekten: Kultur, Religion, Bildung, Sprache, Politik, Arbeit, welfare, Wohnverhältnisse, ethnicity, race, class, gender, Familie, Law and order und Migration. Am Beispiel von belletristischen Texten, Spielfilmen und Musicals wird gezeigt, dass die Puertoricaner in diesen Genres größtenteils wohlwollend dargestellt erscheinen. Das gilt auch für das Musical West Side Story, dem viele Kritiker zu Unrecht vorwerfen, die puertoricanischen Jugendlichen als Gangster zu stigmatisieren. (3) Die puertoricanische Prosa in englischer Sprache hat im Kanon der amerikanischen Literatur und in der Kritik bisher kaum eine Rolle gespielt. Vor allem die zahlreichen Neuerscheinungen der achtziger und neunziger Jahre werden hier erstmals auf historisch-soziologischer Basis analysiert. Allgemeine Trends der neueren Nuyorican-Literatur sind ihre Diversifizierung und Feminisierung. Größere Vielfalt gibt es heute bei den Schauplätzen, den Textsorten und den Themen. Das Thema gender steht nicht nur bei den Frauen, sondern auch bei männlichen Autoren oft im Mittelpunkt. Von den Autoren, die New York zum Schauplatz gewählt haben, ist Abraham Rodriguez, Jr. der bedeutendste. Rodriguez erzählt von Teenagern in der South Bronx, deren puertoricanische Ethnizität kein bestimmender Faktor mehr ist. So ist er der am weitesten amerikanisierte Autor der Nuyoricans. Die überzeugendste Interpretation des Migrationsprozesses bietet Esmeralda Santiago. Bei ihr steht die Kritik am traditionellen puertoricanischen Sexismus im Zentrum. Eine feministische Grundtendenz haben auch die in Puerto Rico angesiedelten, zum Teil magisch-realistischen Werke von Rosario Ferré. Die besten Werke von Rodriguez, Santiago, Ferré und weiteren Puertoricanern verdienen Anerkennung als wertvoller und zukunftweisender Beitrag zur amerikanischen Literatur.The thesis contributes to the debate about the revision of the American literary canon. Its first focus is on the history and mythology of Puerto Rico, the second on the social situation and image of the Puerto Ricans in the U.S., and the third on the prose literature by authors of Puerto Rican descent published in English. (1) The Spanish colony of Puerto Rico became a possession of the U.S. in 1898 and experienced a rapid economic rise in the second half of the 20th century, at the expence of growing dependence on the American welfare state. In free referendums the people of Puerto Rico have so far condoned the intermediate status of their island, which still is neither a state of the union nor an independent nation. But in fact the Commonwealth of Puerto Rico remains a colony of the U.S., as the real power to decide about its status lies with Congress. Puerto Rico's mythology has from the start been dominated by stereotypes, which have resulted in a negative cliché of its national character. The United States' political, economic and cultural hegemony has reinforced the alleged schizophrenic state of Puerto Rico. The only chance of healing this Puerto Rican syndrome is the island's national independence. (2) Stereotypes have also determined the image in the American public of the Puerto Ricans who have migrated to the mainland. The bad reputation of this hardly assimilated group is constantly being confirmed by the mass media, although serious studies prove that earlier immigrants had similar problems. Most U.S. experts still advocate the migrants' gradual assimilitation according to the ideal of cultural pluralism. Since the rise of multiculturalism, within the U.S. Puerto Rican community the trend has been going towards a hybrid, bicultural, Nuyorican identity. The dissertation assesses the literature about Puerto Ricans in the U.S. published in English from 15 key aspects: culture, religion, education, language, politics, work, welfare, housing, ethnicity, race, class, gender, family, law and order und migration. A critical look at books, movies and musicals by non-Puerto Ricans shows that in these genres migrants from Puerto Rico have by and large been portrayed benevolenty. This is true even for the musical West Side Story, which has often been wrongly blamed for stigmatizing Puerto Rican youngsters as gangsters. (3) Puerto Rican prose literature in English has so far played little role in the American canon and in criticism. This thesis offers the first analysis of the many new volumes from the eighties and nineties on a socio-historical basis. The overall trends of recent Nuyorican literature are its diversification und feminization. There is a greater diversity of settings, text types and themes. Gender is a central issue not only with the women, but also with a number of male authors. Of those writers who take New York as the setting, Abraham Rodriguez, Jr. is the most important. Rodriguez's books are about teenagers in the South Bronx whose Puerto Rican ethnicity is no crucial factor any more. Thus he is the most Americanised author among the Nuyoricans. The most convincing interpretation of the migratory process is Esmeralda Santiago's. Her main thrust is against the Puerto Rican tradition of sexism. The works of Rosario Ferré, some told in magic realism and all set in Puerto Rico, also have a feminist tendency. The best books by Rodriguez, Santiago, Ferré and a few more Puerto Ricans deserve to be recognised as a valuable and visionary contribution to American literature