CNPq / Este trabalho tem por objetivo apresentar uma nova proposta aos algoritmos de Demosaicing existentes, utilizando uma abordagem mais flexível quanto ao uso do Color filter array (CFA) em imagens coloridas de único sensor. O algoritmo proposto tem como base a estrutura de problemas inversos, cujo funcionamento utiliza um modelo de operação matriz-vetor que é adaptável ao CFA empregado. A partir deste conceito, o algoritmo trata o problema de Demosaicing como o de minimização de função custo, com um termo referente à dependência da estimativa com os dados obtidos e com o modelo de captura, o outro termo é relacionado aos conhecimentos observados em imagens que podem ser explorados para uma estimativa mais precisa, tal elemento é chamado de Prior. A proposta estabelecida tem como base algoritmos de regularização com foco na alta correlação presente entre os canais de cor (R, G e B), e na suavidade local de regiões uniformes, essa base formaliza o Prior empregado no trabalho. A minimização da proposta é atingida iterativamente através do IRLS-CG, que é a combinação de dois algoritmos de minimização eficientes, que apresenta rápidas respostas, e a capacidade de trabalhar com a norma L1 em conjunto com a norma L2. Com o intuito de atestar a qualidade do algoritmo proposto, foi elaborado um experimento em que o mesmo foi testado com diferentes CFAs e em situação com ruído gaussiano de 35dB e sem ruído algum em imagens da base de dados da Kodak, e os resultados comparados com algoritmos do estado-da-arte, no qual o desempenho da proposta apresentou resultados excelentes, inclusive em CFAs que destoam do padrão Bayer, que é o mais comumente usado na atualidade. / This research presents a new proposal to Demosaicing algorithms, using a more flexible approach to deal with the Color filter array (CFA) in single sensor color imaging. The proposed algorithm is structured in the inverse problems model, whose functions employ a CFA adaptive matrix-vector operational model. From this concept, the Demosaicing problem is treated as a cost function minimization with two terms, one referring to the dependence between the estimation and the data provided by the acquisition model, and other term related to features observed in images, which can be explored to form a more precise estimation, this last term is known as Prior. The established proposal is applied in regularization algorithms with focus on the high correlation among color channels (R, G, and B), and in the local smoothness of uniform regions. Both characteristics organize the Prior employed in this work. The minimization proposed is iteratively achieved through IRLS-CG, which is the combination of two efficient minimization algorithms, that presents quick responses, and the capacity to deal with L1 and L2 norm at the same time. The quality of the proposed algorithm is verified in an experiment in which varous CFA were used and a situation with 35dB gaussian noise and another one with no noise applied to the Kodak dataset, and the results were compared with state-of-the-art algorithms, in which the performance of the proposed Prior showed excellent results, including when the CFA is different from Bayer’s, which is the most commonly used pattern.

Indiana University-Purdue University Indianapolis (IUPUI) / DNA phenotyping is a rapidly developing area of research in forensic biology. Externally visible characteristics (EVCs) can be determined based on genotype data, specifically from single nucleotide polymorphisms (SNPs). These SNPs are chosen based on their association with genes related to the phenotypic expression of interest, with known examples in eye, hair, and skin color traits. DNA phenotyping has forensic importance when unknown biological samples at a crime scene do not result in a criminal database hit; a phenotype profile of the sample can therefore be used to develop investigational leads. IrisPlex, an eye color prediction assay, has previously shown high prediction rates for blue and brown eye color in a European population. The objective of this work was to evaluate its utility in a North American population. We evaluated the six SNPs included in the IrisPlex assay in an admixed population sample collected from a U.S.A. college campus. We used a quantitative method of eye color classification based on (RGB) color components of digital photographs of the eye taken from each study volunteer and placed in one of three eye color categories: brown, intermediate, and blue. Objective color classification was shown to correlate with basic human visual determination making it a feasible option for use in future prediction assay development. In the original IrisPlex study with the Dutch samples, they correct prediction rates achieved were 91.6% for blue eye color and 87.5% for brown eye color. No intermediate eyes were tested. Using these samples and various models, the maximum prediction accuracies of the IrisPlex system achieved was 93% and 33% correct brown and blue eye color predictions, respectively, and 11% for intermediate eye colors. The differences in prediction accuracies is attributed to the genetic differences in allele frequencies within the sample populations tested. Future developments should include incorporation of additional informative SNPs, specifically related to the intermediate eye color, and we recommend the use of a Bayesian approach as a prediction model as likelihood ratios can be determined for reporting purposes.

Text in English, with abstracts and keywords in English and Xhosa / The study delves into traumatic memories rooted in the unconscious mind and the modalities of expression of traumatic memories of childhood. Specific reference is made to the trauma studies of Cathy Caruth and Bessel van der Kolk. Using a framework of contemporary trauma theory, I argue that trauma manifests through childhood sexual abuse (CSA) manifests in trauma and that a number of artworks by myself, Penny Siopis and Nathani Lüneberg, reflect such trauma. The research is conducted as practice-led research and focuses on interpretations of selected artworks as well as a theoretical component. The body of large-scale digital paintings plays a significant role in the research process, which implies that theory leads practice and vice versa. The work encompasses the visual exploration of CSA and it is specifically analysed according to my interpretation of symbols such as the naked female body and intimate scenes which illustrate, vulnerabilty, curtains that metaphorically represent a view into my unconscious mind. The symbol of the uterus or the womb, where a foetus or unborn baby develops and grows, is a symbol of nurturing and protection. The artworks are primarily considered according to notions of CSA that cause betrayal and traumatic associations with sex, angst and psychological fragility in children. The exhibition portrays the psychobiological and psyhoanalytical aspects of childhood trauma resulting from CSA. The creative work consists of four digital paintings and seven photographic artworks. The artworks in The Silent Wound Series portray CSA, childhood trauma, and traumatic memories in the unconscious. Dealing with the understanding and representation of childhood trauma such as CSA, these themes are continuously embodied in my artworks. As the portrayal of the fragile girl child’s body as a signifier in the artworks relates to my personal situation, I choose an empathic view of childhood trauma within the study, portraying traumatic events and the memories thereof in the unconscious. The aim of the study is to recognise how digital painting and photography enable the representation and understanding of CSA and traumatic memories and how the silenced and abused child’s voice can be expressed through the affective and transactive quality of art. The main study objective is to investigate if traumatic memories occur in victims of CSA. / Uphononongo lungena nzulu kwiinkumbulo ezoyikisayo ezendele kwingqondo eleleyo kunye neendlela zokubonisa iinkumbulo ezibuhlungu zobuntwana. Ngokukhethekileyo kujoliswe kuphando olwenziwe kwizifundo zomothuko zikaCathy Caruth noBessel van der Kolk. Ndisebenzisa isakhelo sethiyori yanamhlanje, ndivakalisa ukuba umothuko wokuxhatshazwa ngokwesondo ebuntwaneni (i-CSA) bubonakala kuloyiko kwaye eminye yemisebenzi yam yobugcisa, uPenny Siopis kunye noNathani Lüneberg, ibonisa uloyiko olunjalo. Uphando lwenziwa njengophando olukhokelwa kukuziqhelanisa kwaye lujolise kutoliko lwemisebenzi yobugcisa ekhethiweyo kunye nenxalenye yethiyori. Uvimba wemizobo emikhulu yedijithali idlala indima ebalulekileyo kwinkqubo yophando, oko kuthetha ukuba ithiyori ikhokelela ekusebenzeni kwaye nangokuphendulelekileyo. Umsebenzi uquka uphando olubonakalayo kwe-CSA kwaye ucazululwa ngokukodwa ngokokutolika kwam iisimboli ezinje ngomzimba wabasetyhini ehamba ze kunye nemiboniso esondeleleneyo ebonisa, ukuba sesichengeni, iikhethini ngokukwekwayo ezimele imbono kwingqondo yam eleleyo. Uphawu lwesibeleko okanye isibeleko, apho umbungu okanye usana olungekazalwa lukhula khona kwaye lukhule, siluphawu lokondla nokukhusela. Imisebenzi yobugcisa iqwalaselwa ikakhulu ngokwemibono ye-CSA ebangela ukungcatshwa kunye nomanyano oludakumbisayo ngezesondo, ixhala kunye nobu-ethe-ethe ngokwengqondo ebantwaneni. Umboniso uzoba iimeko zengqondo ephilayo kunye nohlalutyo lwengqondo elimeleyo yobuntwana ebangelwe yi-CSA. Umsebenzi wobugcisa unemizobo emine yedijithali kunye neefoto zobugcisa esixhenxe. Imisebenzi yobugcisa kwi-Silent Wound Series izoba i-CSA, umothuko wobuntwana, kunye neenkumbulo ezibuhlungu ezikwingqondo eleleyo. Ukusebenza nokuqonda nokutolika ukwenzakaliswa kobuntwana okufana ne-CSA, le mixholo ihlala iyinxalenye kwimisebenzi yam yobugcisa.Njengoko ukwenza uzobo lomzimba o-ethe-ethe womntwana oyintombazana njengomboniso kwimisebenzi yobugcisa kunxulumene nemeko yam yobuqu, ndikhetha umbono onovelwano wokwenzakala kobuntwana kolu phononongo, ndibonisa iziganeko ezihlasimlis 'umzimba kunye neenkumbulo zazo ezingqondweni ezileleyo. Injongo yophando kukufuna ukuqonda ukuba imizobo ngedijithali kunye nokufota kukwenza njani ukumelwa kunye nokuqondwa kwe-CSA neenkumbulo ezenzakalisayo nokuba ilizwi elithulisiweyo nempatho-mbi yomntwana linokuvakaliswa njani ngokomgangatho ochaphazelayo notshintshayo wobugcisa. Eyona njongo iphambili yophando kukuphanda ukuba iinkumbulo ezibuhlungu ziyenzeka kumaxhoba e-CSA. / Arts and Music / M.V.A.

Text in English, with abstracts and keywords in English, Zulu and Xhosa / Link to the dataset (catalogue): https://doi.org/10.25399/UnisaData.14101913.v1 / Digital image editing is rooted in the analog practices of photographic retouching from the late nineteenth century. This study interrogated how novel contributions of new media practice can inform understanding of the relationship between digital and analog media. The study also sought to explore new conceptual avenues in the creation of digital art that incorporates key aspects of both new and traditional media. This study employed a literature review of selected discourses related to new media studies. Specifically, the work of scholars Lev Manovich, Jay David Bolter, Richard Grusin, and Filipe Pais on the interplay between traditional and new media formed the cornerstone of the analysis. These discourses contextualise an analysis of several contemporary case studies of digital artists, with a particular focus on John Craig Freeman and the Oddviz collective. These works were selected for the way in which they destabilise conventional notions of digital photography in new media and the way digital content can be ‘displaced’ into a physical space. From this analysis several concepts arise that serve as distinguishing markers for media displacement. These themes include embodiment, memory, identity formation, autotopography, and intermediality. The dissertation concludes with an overview of my work that incorporates the concepts derived from my analysis of the case studies. It discusses how my exhibition Digital Tourist, a mixed media installation, makes use of photogrammetry and AR to displace the private connections of an individual life into the public space of the gallery. / Ukuhlelwa kwezithombe zezindaba zedijithali kususelwe emikhubeni ye-analokhu yokuthwebula kabusha izithombe kusukela ngasekupheleni kwekhulu leshumi nesishiyagalolunye leminyaka.. Lolu cwaningo luphenye ukuthi iminikelo yenoveli emisha yokwenziwa kwezezindaba ezintsha zingakwazisa kanjani ukuqonda kobudlelwano phakathi kwezindaba zedijithali ne-analokhu. Ucwaningo luphinde lwafuna ukubheka izindlela ezintsha zomqondo ekwakhiweni kobuciko bedijithali obufaka izinndaba ezibalulekile kokubili kwezokuxhumana nezendabuko ezintsha. Izinkulumo ezikhethiwe ezihlobene nezifundo zezindaba ezintsha zibuyekeziwe. Ngokuqondile, umsebenzi wezazi uLev Manovich, Jay David Bolter, Richard Grusin noFilipe Pais ekusebenzisaneni phakathi kwabezindaba bendabuko nabasha kwakha okuzobhekwa ngqo uma kuhlaziywa. Lezi zinkulumo zigxila ekuhlaziyweni kwezifundo zamanje zamaciko edijithali, kugxilwe kakhulu kuJohn Craig Freeman kanye neqoqo le-Oddviz. Le misebenzi yakhethwa ngendlela yokuthi ingazinzisi imiqondo ejwayelekile yokuthwebula izithombe zedijithali emithonjeni emisha kanye nokuthi okuqukethwe kwedijithali "kungahanjiswa kanjani" endaweni ebonakalayo. Ukusuka kulokhu kuhlaziywa kuvela imiqondo eminingana esebenza njengezimpawu ezihlukanisayo zokufuduswa kwabezindaba. Lezi zingqikithi zifaka phakathi ukwakheka, inkumbulo, ukwakheka kobunikazi, ukuziphendulela kanye nokuzibandakanya. Idezetheyishini iphetha ngokubuka konke ngomsebenzi wami ohlanganisa imiqondo esuselwe ekuhlaziyweni kwami kwezifundo zocwaningo. Ingxoxo ihlanganisa ukuthi umbukiso wami we-Zivakashi zeDijithali, ukufakwa kwabezindaba okuxubile, isebenzisa uhlelo lokuthwebula olusebenzisa ulimi noma ifothogrametri ne-AR ukukhipha ukuxhumana kwangasese kwempilo yomuntu ngamunye endaweni yomphakathi yegalari. / Ukuhlela imifanekiso yedijithali yinkqubo eyendeleyo, nowaqalwa kwiminyaka yokugqibela yenkulungwane yeshumi elinethoba, kwimisebenzi yezifaniso/yeanalogu ekuhlaziyweni kweefoto. Esi sifundo siphonononga ukuba igalelo elikhethekileyo leendlela ezintsha zonxibelelwano lwemiboniso/imidiya lingenza njani ukuqinisa ukuqonda unxulumano phakathi kwemiboniso yedijithali neyeanalogu. Kwakhona, esi sifundo sizama ukuphanda iindlela ezintsha ezisetyenziswa kubugcisa bedijithali neziquka imiba ephambili yemiboniso yale mihla neyakudala. From this analysis several concepts arise that serve as distinguishing markers for media displacement. These themes include embodiment, memory, identity formation, autotopography and intermediality. Kuphononongwe iingxoxo ezithile ezimalunga nezifundo zemiboniso yale mihla. Kuqwalaselwe ngakumbi imisebenzi yeengcali ooLev Manovich, Jay David Bolter, Richard Grusin kunye noFilipe Pais malunga nonxulumano phakathi kwemiboniso yakudala neyale mihla njengesiseko solu hlalutyo. Ezi ngxoxo zifaka emxholweni uhlalutyo lwezifundo zokuzekelisa zale mihla malunga nabazobi bale mihla, kugxininiswa kwindibanisela ka John Craig Freeman nekaOddviz. Le misebenzi ikhethwe ngenxa yokuba iyazichitha iingcinga eziqhelekileyo malunga nokufota ngedijithali kwimiboniso yale mihla nangendlela iziqulatho zedijithali “zinokushenxiswa” zisiwe kwindawo ebambekayo. Olu hlalutyo luveze iingcinga eziliqela nezisebenza njengeempawu zoshenxiso lwemiboniso. Imixholo iquka imifuziselo, ukukhumbula, ukwenziwa kwesazisi, ukuzazisa ngezinto onazo, unxulumano phakathi kwemiboniso eyahlukeneyo Le ngxelo yophando igqibela ngokushwankathela umsebenzi wam ohlanganisa iingcinga ezivele ekuhlalutyeni kwam izifundo ezingumzekelo. Ingxoxo ibonisa ukuba umboniso wengqokelela yemisebenzi yam owaziwa ngokuba yiDigital Tourist, ubusebenzise njani ubuchwepheshe ekuthiwa yifotogrametri (obokufumana ulwazi ngokuhlalutya imifanekiso) ekushenxiseni unxulumano lwabucala lobomi bomntu ibubeke kwindawo ebonwa nguwonkewonke apho kubukwa imifanekiso neefoto (igalari). / https://doi.org/10.25399/UnisaData.14101913.v1 / Arts and Music / M.A. (Visual Arts)