Comparison of Local Feature Detectors and Descriptors for Visual Object Categorization

Local features are used in many computer vision tasks including visual object categorization, content-based image retrieval and object recognition to mention a few. Local features are points, blobs or regions in images that are extracted using a local feature detector. To make use of extracted local features the localized interest points are described using a local feature descriptor. A descriptor histogram vector is a compact representation of an image and can be used for searching and matching images in databases. In this thesis the performance of local feature detectors and descriptors is evaluated for object class detection task. Features are extracted from image samples belonging to several object classes. Matching features are then searched using random image pairs of a same class. The goal of this thesis is to find out what are the best detector and descriptor methods for such task in terms of detector repeatability and descriptor matching rate.

Verbal learning in mild cognitive impairment and alzheimer's disease : behavioural and neural approaches

The main focus of the present thesis was at verbal episodic memory processes that are particularly vulnerable to preclinical and clinical Alzheimer’s disease (AD). Here these processes were studied by a word learning paradigm, cutting across the domains of memory and language learning studies. Moreover, the differentiation between normal aging, mild cognitive impairment (MCI) and AD was studied by the cognitive screening test CERAD. In study I, the aim was to examine how patients with amnestic MCI differ from healthy controls in the different CERAD subtests. Also, the sensitivity and specificity of the CERAD screening test to MCI and AD was examined, as previous studies on the sensitivity and specificity of the CERAD have not included MCI patients. The results indicated that MCI is characterized by an encoding deficit, as shown by the overall worse performance on the CERAD Wordlist learning test compared with controls. As a screening test, CERAD was not very sensitive to MCI. In study II, verbal learning and forgetting in amnestic MCI, AD and healthy elderly controls was investigated with an experimental word learning paradigm, where names of 40 unfamiliar objects (mainly archaic tools) were trained with or without semantic support. The object names were trained during a 4-day long period and a follow-up was conducted one week, 4 weeks and 8 weeks after the training period. Manipulation of semantic support was included in the paradigm because it was hypothesized that semantic support might have some beneficial effects in the present learning task especially for the MCI group, as semantic memory is quite well preserved in MCI in contrast to episodic memory. We found that word learning was significantly impaired in MCI and AD patients, whereas forgetting patterns were similar across groups. Semantic support showed a beneficial effect on object name retrieval in the MCI group 8 weeks after training, indicating that the MCI patients’ preserved semantic memory abilities compensated for their impaired episodic memory. The MCI group performed equally well as the controls in the tasks tapping incidental learning and recognition memory, whereas the AD group showed impairment. Both the MCI and the AD group benefited less from phonological cueing than the controls. Our findings indicate that acquisition is compromised in both MCI and AD, whereas long13 term retention is not affected to the same extent. Incidental learning and recognition memory seem to be well preserved in MCI. In studies III and IV, the neural correlates of naming newly learned objects were examined in healthy elderly subjects and in amnestic MCI patients by means of positron emission tomography (PET) right after the training period. The naming of newly learned objects by healthy elderly subjects recruited a left-lateralized network, including frontotemporal regions and the cerebellum, which was more extensive than the one related to the naming of familiar objects (study III). Semantic support showed no effects on the PET results for the healthy subjects. The observed activation increases may reflect lexicalsemantic and lexical-phonological retrieval, as well as more general associative memory mechanisms. In study IV, compared to the controls, the MCI patients showed increased anterior cingulate activation when naming newly learned objects that had been learned without semantic support. This suggests a recruitment of additional executive and attentional resources in the MCI group.

Neural correlates of language learning in adults

The human language-learning ability persists throughout life, indicating considerable flexibility at the cognitive and neural level. This ability spans from expanding the vocabulary in the mother tongue to acquisition of a new language with its lexicon and grammar. The present thesis consists of five studies that tap both of these aspects of adult language learning by using magnetoencephalography (MEG) and functional magnetic resonance imaging (fMRI) during language processing and language learning tasks. The thesis shows that learning novel phonological word forms, either in the native tongue or when exposed to a foreign phonology, activates the brain in similar ways. The results also show that novel native words readily become integrated in the mental lexicon. Several studies in the thesis highlight the left temporal cortex as an important brain region in learning and accessing phonological forms. Incidental learning of foreign phonological word forms was reflected in functionally distinct temporal lobe areas that, respectively, reflected short-term memory processes and more stable learning that persisted to the next day. In a study where explicitly trained items were tracked for ten months, it was found that enhanced naming-related temporal and frontal activation one week after learning was predictive of good long-term memory. The results suggest that memory maintenance is an active process that depends on mechanisms of reconsolidation, and that these process vary considerably between individuals. The thesis put special emphasis on studying language learning in the context of language production. The neural foundation of language production has been studied considerably less than that of perceptive language, especially on the sentence level. A well-known paradigm in language production studies is picture naming, also used as a clinical tool in neuropsychology. This thesis shows that accessing the meaning and phonological form of a depicted object are subserved by different neural implementations. Moreover, a comparison between action and object naming from identical images indicated that the grammatical class of the retrieved word (verb, noun) is less important than the visual content of the image. In the present thesis, the picture naming was further modified into a novel paradigm in order to probe sentence-level speech production in a newly learned miniature language. Neural activity related to grammatical processing did not differ between the novel language and the mother tongue, but stronger neural activation for the novel language was observed during the planning of the upcoming output, likely related to more demanding lexical retrieval and short-term memory. In sum, the thesis aimed at examining language learning by combining different linguistic domains, such as phonology, semantics, and grammar, in a dynamic description of language processing in the human brain.

Application of Open Innovation Paradigm in Small and Medium Enterprises in Russia

The objective of this study is to explore how the Open Innovation paradigm is applied in by small and medium-size enterprises in Russia. The focus of the study is to understand how the processes of research and development and commercialization proceed in these kind of companies and to which extent they apply open innovation principles. Russian leadership makes certain steps for transition from the export of raw materials to an innovative model of economic growth. The research aims to disclose actual impact of these attempts. The closed innovation model and the erosion factors which lead to the destruction of an old one and emergence of new model are described. Features of open innovation implementation and intellectual property rights protection in small and medium enterprises are presented. To achieve the objective, a qualitative case study approach was chosen. Research includes facts and figures, views and opinions of management of studied companies related to innovation process in the company and in Russia in general. The research depicts the features of Open Innovation implementation by SMEs in Russia. A large number of research centers with necessary equipment and qualified personnel allow case companies to use external R&D effectively. They cooperate actively with research institutes, universities and laboratories. Thus, they apply inbound Open Innovation. On the contrary, lack of venture capital, low demand for technologies within the domestic market and weak protection of intellectual property limit the external paths to new markets. Licensing-out and creation of spin-off are isolated cases. Therefore, outbound Open Innovation is not a regular practice.

Bag-of-Features Approach to Unsupervised Visual Object Categorisation

The large and growing number of digital images is making manual image search laborious. Only a fraction of the images contain metadata that can be used to search for a particular type of image. Thus, the main research question of this thesis is whether it is possible to learn visual object categories directly from images. Computers process images as long lists of pixels that do not have a clear connection to high-level semantics which could be used in the image search. There are various methods introduced in the literature to extract low-level image features and also approaches to connect these low-level features with high-level semantics. One of these approaches is called Bag-of-Features which is studied in the thesis. In the Bag-of-Features approach, the images are described using a visual codebook. The codebook is built from the descriptions of the image patches using clustering. The images are described by matching descriptions of image patches with the visual codebook and computing the number of matches for each code. In this thesis, unsupervised visual object categorisation using the Bag-of-Features approach is studied. The goal is to find groups of similar images, e.g., images that contain an object from the same category. The standard Bag-of-Features approach is improved by using spatial information and visual saliency. It was found that the performance of the visual object categorisation can be improved by using spatial information of local features to verify the matches. However, this process is computationally heavy, and thus, the number of images must be limited in the spatial matching, for example, by using the Bag-of-Features method as in this study. Different approaches for saliency detection are studied and a new method based on the Hessian-Affine local feature detector is proposed. The new method achieves comparable results with current state-of-the-art. The visual object categorisation performance was improved by using foreground segmentation based on saliency information, especially when the background could be considered as clutter.

Venäläistä rulettia – Nuorten perhesuunnittelun esteet ja tarpeet Pietarissa ja Riiassa

Latviassa ja Venäjällä heikko demografinen tilanne on lisännyt keskustelua seksuaali- ja kansalaisoikeuksista sekä valtion merkityksestä niiden toteuttamisessa. Väestöpolitiikassa näkyy yhteiskunnallinen tilanne sekä sen kyky ja mahdollisuudet huomioida nuorten perhesuunnitteluun liittyviä tarpeita. Huomion kohteena on myös palvelujärjestelmä ja siinä toteutuva yksilöllinen taso. Tutkin perhesuunnittelua kokonaisvaltaisesti, mikä ilmenee erilaisten polkuriippuvuuksien tarkasteluina. Mielenkiintoiseksi kohteen tekee entisten sosialististen valtioiden erityislaatuisen murroksen läpikäyminen. Perhesuunnittelu on osa seksuaali- ja ihmisoikeuksia. Siihen kuuluu seksuaaliterveydestä tiedottaminen ja ohjaus sekä siihen liittyvät toimenpiteet. Perhesuunnittelu sisältää niin sosiaaliset, kasvatukselliset kuin lääketieteellisetkin näkökulmat. Siihen liitetään myös moraalisia ja taloudellisia näkemyksiä, sekä politiikkaa ja henkilökohtaisuutta. Tutkimustehtäväni on nuorten perhesuunnittelun esteet ja tarpeet Riiassa ja Pietarissa. Sovellan metodologisena lähestymistapana sosiaalihistoriallista ja etnografista tutkimusotetta, jolloin perinteen vaikutusten, kulttuuristen rakenteiden ja yksilöllisten toimintatapojen ymmärtäminen mahdollistuu. Aineisto koostuu viranomaishaastatteluista sosialismin kaudella toteutuneesta sekä nykyisestä perhesuunnittelusta ja nuorten haastatteluista Pietarissa ja Riiassa. Perehdyn myös lisääntymisterveyteen liittyviin sanomalehtiartikkeleihin sekä Latviassa että Venäjällä. Lisäksi havainnoin seksuaalineuvontatilanteita Pietarissa. Sekä sosialismin aikana että nykyään painottuvat väestönkasvun odotukset, joita tuetaan sukupuoli- ja moraalikasvatuksen avulla. Perhesuunnittelun esteiden analyysin tuloksissa on nähtävissä sosiaalisten olosuhteiden ja rakenteiden merkitys. Jälkisosialistisesta riskiyhteiskunnasta puuttuvat yhteiskuntaan integroitumisen mahdollistavat instituutiot. Tämä ilmenee yhteiskunnallisena vastuuttomuutena. Universaalit palvelut ovat suurelta osin peräisin sosialismin ajalta. Kaupalliset yritykset tekevät lähinnä teknisiä, yksittäisiä ehkäisyvälineisiin liittyviä interventioita nuorten elämään. Teini-ikäiset jätetään oman harkintansa varaan. Latviassa perhesuunnitteluun liittyvä ennalta ehkäisevä toiminta on huomioitu uudessa lisääntymisterveyslaissa, mutta sen heikko toteutus tuo sen lähelle neuvostoaikaista kulttuurikonventiota, jossa määrällisillä suoritteilla ja sekundaaripreventiolla on arvoa. Venäjällä voimavarat kohdentuvat jälkihuollon palveluihin. Foucaultin valta-analyysi kertoo strategiasta, jossa ihminen sisäistää vallankäytön osaksi omaa ajatteluaan ja toimintaansa. Tässä näkökulmassa yksilöllinen, yhteiskunnallinen ja historiallinen ulottuvuus limittyvät toisiinsa. Vallan muodot ovat yhteiskunnan rakenteissa. Väestöpolitiikan avulla tuotetaan tietoa ja muovataan hallitsemisen kohteita. Osa haastatelluista nuorista omaksui yhteiskunnan passiivisuuden osaksi omaa toimintaansa. He eivät tiedostaneet palvelujärjestelmän puutteita eivätkä kyseenalaistaneet sen oikeutusta. Myös lehtiartikkelit ja viranomaishaastattelut tukivat osittain seksuaalikasvatuksen sivuuttamista. Silloin hyväksyttävänä totuutena pidettiin väestöpolitiikkaa, jossa on annettu tilaa populistisille suuntauksille. Sekä Latviassa että Venäjällä ilmaistiin tavoitteita väestön kasvusta. Kansainvälisten seksuaalioikeuksien maihinnousu ei ole poistanut ääri uskonnollisten ja osittain kansalaisjärjestöjen puitteissa tapahtuvaa perhesuunnittelun vastustusta. Näissä suuntauksissa vaikutetaan ihmisten moraaliin ja vastustetaan yhteiskunnan interventioita kieltämällä seksuaalikasvatus. Sosialismin aikana sosiaali- ja terveydenhuoltoa toteutettiin totalitaristisessa, suljetussa yhteiskunnassa tiukasti rajatuilla voimavaroilla. Tuolta ajalta peräisin oleva viranomaisten yleinen medikalisoitunut ja tekninen lähestymistapa estää osittain nuoren valtaistumista. Vieläkin heikko tiedottaminen ja puutteellinen koulutus vaikuttavat ammattilaisten keskuudessa. Yksi haitallisista perhesuunnitteluun kuuluvista uskomuksista oli hormonaalisen ehkäisyn aiheuttamat ongelmat. Lisäksi pelättiin heikkotasoisesti tehtyjen aborttien aiheuttavan hedelmättömyyttä. Uskomukset ovat eläneet vieläkin, kun osa asiantuntijoista kannusti ensimmäisen raskauden päättymistä synnytykseen. Näillä käsityksillä on ollut taipumus siirtyä sukupolvelta toiselle myös kansalaisten keskuudessa. Sukuyhteisöjen ja verkostojen oleellinen merkitys teini-ikäisen arjessa ja selviytymisessä painotti perinteistä sosialisaatiota. Uskomusten lisäksi nuorten heikko taloudellinen tilanne on ohjannut heitä ehkäisyssä luonnonmenetelmien käyttöön. Neuvostoaikainen seksuaalikielteisyyden perinne on vaikuttanut myös sukupolvien kyvyttömyyteen keskustella aiheesta. Yleisen ennaltaehkäisevän neuvonnan puuttuminen on suunnannut suurta osaa nuoria mallioppimiseen, jossa esimerkit ovat nousseet satunnaisista löydöistä. Toisaalta työntekijöiden neuvokkuus ja aloitteellisuus erilaisissa ohjaamistilanteissa, toimintatavoissa ja instituutioiden perustamisissa kuvaavat eettistä vastuunottoa ja paneutumista nuorten perhesuunnittelun toteutumiseen sekä sen mahdollisuuksiin. Perhesuunnitteluun liittyvän tiedonsaannin parantamiseksi viranomaiset ovat aloittaneet nuorten vertaisryhmiä. Lisäksi yhtenä uutena virallisena lähestymistapana oli neuvostoaikana kielletty psykoterapeuttisen suuntauksen avoin käyttöönotto. Myös nuorille suunnattuja palveluja niin lainsäädännön kuin instituutioiden tasolla on saatu aikaan. Nämä myönteiset tapaukset jäivät kuitenkin yksittäisiksi, osittain joidenkin työntekijöiden omakohtaisen sitoutumisen varaan toimiviksi. Tutkimuksessa nousee esiin yhteiskunnan vastuu erityisesti haavoittuvien ryhmien kohdalla. Nuoret ovat tiedoiltaan ja kokemuksiltaan heikossa asemassa. Sosiaalipoliittisesta näkökulmasta julkisilla ja ennaltaehkäisevillä palveluilla on keskeinen merkitys etenkin niiden kohdalla, jotka tarvitsevat runsaasti palveluja. Usein tähän ryhmään kuuluvat ovat passiivisia tiedon hakijoita. Tutkimus tuo esille perhesuunnittelun palvelujärjestelmään ja sen kohderyhmään kuuluvan moniulotteisuuden, jossa toisiinsa nivoutuvat kulttuuriset myytit, uskomukset, tabut, toimintatavat ja tietämys. Näiden polkujen avaaminen tässä tutkimuksessa edistää perhesuunnittelun esteiden tunnistamista ja niihin soveltuvien ratkaisukeinojen löytymistä.

The effectiveness of vocationally oriented multidisciplinary rehabilitation (ASLAK®) amongst public sector employees

In Finland, vocationally oriented medical rehabilitation (ASLAK®) is a common preventive rehabilitation measure with the primary goal of preserving and improving work ability. The ASLAK® programme has been used for almost 30 years, although limited data exist on its effectiveness. The aims of this study were to determine whether the increased risk of work disability predicts the participants’ likelihood to be granted ASLAK® rehabilitation and to assess the effectiveness of the programme in decreasing the risk of work disability and modifying health-risk behaviours. This study is a part of the on-going Finnish Public Sector Study conducted by the Finnish Institute of Occupational Health. Data on 53 416 employees (81% women) were gathered from employers’ records, national health registers and repeated survey responses. During the 5-year follow-up, increased levels of the risk factors for work disability did not predict participation in the rehabilitation programme. During the 2.8-year followup (range 0.04–5.0 years), the risk of long-term work disability (sick leave >90 days or retirement) overall or, more specifically, due to musculoskeletal or mental diseases did not differ between the rehabilitants who participated in ASLAK® in 1997–2005 and their propensity score matched controls. There was no evidence of ASLAK® being effective in changing participants’ health-risk behaviours or in improving perceived general or mental health. The results suggest that potential participant recognition, mainly taking place in occupational health care, may fail to identify those with a higher risk of work disability. No evidence on the effectiveness of the programme was found in the study cohort when measured by the selected indicators.

Finnish Institutional Innovation Support Policies from Russian Entrepreneurs' Perspective: Establishing Cross-Border Technology Oriented Start-Up Firm

The purpose of this thesis is to study how Russian entrepreneurs perceive Finnish institutional environment and innovation support policies provided in the country, as well as to present a practical example in form of a case study of one technology oriented start-up firm which was established in Finland by Russian entrepreneurs. The empirical research of the thesis is conducted qualitatively in two parts. First part is conducted through online questionnaire with open questions in order to review the perceptions of Russian entrepreneurs in general. Second part is based on personal interviews with case company’s founders with the focus on the process of establishing the company in Finland. In the first part of the empirical research, five Russian start-up firms were contacted, and four responses were received. All of these responses were qualified for further analysis. The findings of the first part of the research reveal that Russian entrepreneurs have rather positive attitudes towards Finnish institutional innovation support policies. However, most of the entrepreneurs stated that they are unlikely to create their presence in Finland. As an outcome of the second part of the research, the process of establishing a case company in Finland is illustrated. In order to be able to establish companies in Finland, Russian entrepreneurs who have a permanent residence outside European Economic Area (EEA) are required to apply for a permission to perform business operations in the country. In addition, the established company must engage in improving the economical stand of the country by creating new work places, raising tax revenues, develop technologies and generate innovations in the country.

Complicated diverticular disease: the changing paradigm for treatment

The term "complicated" diverticulitis is reserved for inflamed diverticular disease complicated by bleeding, abscess, peritonitis, fistula or bowel obstruction. Hemorrhage is best treated by angioembolization (interventional radiology). Treatment of infected diverticulitis has evolved enormously thanks to: 1) laparoscopic colonic resection followed or not (Hartmann's procedure) by restoration of intestinal continuity, 2) simple laparoscopic lavage (for peritonitis +/- resection). Diverticulitis (inflammation) may be treated with antibiotics alone, anti-inflammatory drugs, combined with bed rest and hygienic measures. Diverticular abscesses (Hinchey Grades I, II) may be initially treated by antibiotics alone and/or percutaneous drainage, depending on the size of the abscess. Generalized purulent peritonitis (Hinchey III) may be treated by the classic Hartmann procedure, or exteriorization of the perforation as a stoma, primary resection with or without anastomosis, with or without diversion, and last, simple laparoscopic lavage, usually even without drainage. Feculent peritonitis (Hinchey IV), a traditional indication for Hartmann's procedure, may also benefit from primary resection followed by anastomosis, with or without diversion, and even laparoscopic lavage. Acute obstruction (nearby inflammation, or adhesions, pseudotumoral formation, chronic strictures) and fistula are most often treated by resection, ideally laparoscopic. Minimal invasive therapeutic algorithms that, combined with less strict indications for radical surgery before a definite recurrence pattern is established, has definitely lead to fewer resections and/or stomas, reducing their attendant morbidity and mortality, improved post-interventional quality of life, and less costly therapeutic policies.

Exploring Customer-Oriented Service Offerings in Public Health: Developing Integrated Health Care Services for Rural Areas

Väestön ikääntyminen pakottaa yhteiskunnan ja julkisen terveydenhuollon muutoksiin. Jotta ikääntyvien ihmisten kotona asuminen voidaan mahdollistaa, palvelujärjestelmän pitää mukautua muuttuvaan tilanteeseen. Tämän diplomityön tarkoituksena on tunnistaa asiakaslähtöisiä lähellä asiakasta tarjottavia palvelukokonaisuuksia. Tutkimuksen teoreettinen viitekehys muodostuu asiakasarvon luomisesta ja palvelutarjoamista. Tarkasteluryhmänä on Etelä-Karjalan alueen 60–90-vuotiaat ja käytetty aineisto on kerätty vastaajilta postitse lähetetyllä kyselyllä. Tutkimus on eksploratiivinen ja tulosten tulkinnassa on hyödynnetty määrällisen tutkimuksen ja verkostoanalyysin menetelmiä. Työn keskeisimmät tulokset ovat tunnistetut asiakassegmentit ja heidän tarpeidensa pohjalta muodostetut palvelupaketit. Tulokset indikoivat asiakkaiden tarpeita ja tuloksia on analysoitu myös tuottajan näkökulmasta. Empiiristen tulosten lisäksi teoriaviitekehystä on kehitetty eteenpäin, jotta palvelukeskeiset teoriat voidaan ymmärtää yritysten näkökulman lisäksi asiakkaan näkökulmasta.

Strategic communication : practice, ideology and dissonance

This dissertation approaches the manifestations of ideology in U.S. Strategic Communication. The discussion approaches Strategic Communication by relating it to the Enlightenment narratives and suggesting these narratives maintain similar social and political functions. This dissertation aims to address the key contents and mechanisms of Strategic Communication by covering the perspectives of (i) communication as leadership as well as (ii) communication as discourse , i.e. practice and contents. Throughout the empirical part of the dissertation, the communication theoretical discussion is supported by a methodological framework that bridges Critical Discourse Analysis (CDA) and functional language theory. According to the principles of CDA, Strategic Communication is treated as ideological, hegemonic discourse that impacts social order. The primary method of analysis is transitivity analysis, which is concerned with how language and its patterns construe reality. This analysis is complemented with a discussion on the rituals of production and interpretation, which can be treated as visual extensions of textual transitivity. The concept of agency is the key object of analysis. From the perspective of leadership, Strategic Communication is essentially a leadership model through which the organization defines itself, its aims and legitimacy. This dissertation arrives to the conclusion that Strategic Communication is used not only as a concept for managing Public Relations and information operations. It is an esse ntial asset in the inter-organization management of its members. The current developments indicate that the concept is developing towards even heavier measures of control. From the perspective of language and discourse, the key narratives of Strategic Communication are advocated with the intrinsic values of democracy and technological progress as the prerequisites of ethics and justice. The transitivity patterns reveal highly polarized agency. The agency of the Self is typically outsourced to technology. Further, the transitivity pa tterns demonstrate how the effects-centric paradigm of warfare has created a lexicon that is ideologically exclusive. It has led to the development of two mutually exclusive sets of vocabulary, where the desc riptions of legitimate ac tion exclude Others by default. These ideological discourses have become naturalized in the official vocabulary of strategic planning and le adership. Finally, the analysis of the images of the captures and deaths of Saddam Hussein, Osama bin Laden and Muammar Gaddafi bring the discussion back to the themes of the Enlightenment by demonstrating how democracy is framed to serve political purposes. The images of democracy are essentially images of violence. Contrary to the official, instrumental and humanitari an narratives of Strategic Communication, it is the grammar of expressive, violent rituals that serve as the instrument of unity.

Local Features in Image and Video Processing - Object Class Matching and Video Shot Detection

The usage of digital content, such as video clips and images, has increased dramatically during the last decade. Local image features have been applied increasingly in various image and video retrieval applications. This thesis evaluates local features and applies them to image and video processing tasks. The results of the study show that 1) the performance of different local feature detector and descriptor methods vary significantly in object class matching, 2) local features can be applied in image alignment with superior results against the state-of-the-art, 3) the local feature based shot boundary detection method produces promising results, and 4) the local feature based hierarchical video summarization method shows promising new new research direction. In conclusion, this thesis presents the local features as a powerful tool in many applications and the imminent future work should concentrate on improving the quality of the local features.