Adaptive Segmentation of Knee Radiographs for Selecting the Optimal ROI in Texture Analysis

The purposes of this study were to investigate: 1) the effect of placement of region-of-interest (ROI) for texture analysis of subchondral bone in knee radiographs, and 2) the ability of several texture descriptors to distinguish between the knees with and without radiographic osteoarthritis (OA). Bilateral posterior-anterior knee radiographs were analyzed from the baseline of OAI and MOST datasets. A fully automatic method to locate the most informative region from subchondral bone using adaptive segmentation was developed. We used an oversegmentation strategy for partitioning knee images into the compact regions that follow natural texture boundaries. LBP, Fractal Dimension (FD), Haralick features, Shannon entropy, and HOG methods were computed within the standard ROI and within the proposed adaptive ROIs. Subsequently, we built logistic regression models to identify and compare the performances of each texture descriptor and each ROI placement method using 5-fold cross validation setting. Importantly, we also investigated the generalizability of our approach by training the models on OAI and testing them on MOST dataset.We used area under the receiver operating characteristic (ROC) curve (AUC) and average precision (AP) obtained from the precision-recall (PR) curve to compare the results. We found that the adaptive ROI improves the classification performance (OA vs. non-OA) over the commonly used standard ROI (up to 9% percent increase in AUC). We also observed that, from all texture parameters, LBP yielded the best performance in all settings with the best AUC of 0.840 [0.825, 0.852] and associated AP of 0.804 [0.786, 0.820]. Compared to the current state-of-the-art approaches, our results suggest that the proposed adaptive ROI approach in texture analysis of subchondral bone can increase the diagnostic performance for detecting the presence of radiographic OA

CONTENT BASED RETRIEVAL OF LECTURE VIDEO REPOSITORY: LITERATURE REVIEW

Multimedia has a significant role in communicating the information and a large amount of multimedia repositories make the browsing, retrieval and delivery of video contents. For higher education, using video as a tool for learning and teaching through multimedia application is a considerable promise. Many universities adopt educational systems where the teacher lecture is video recorded and the video lecture is made available to students with minimum post-processing effort. Since each video may cover many subjects, it is critical for an e-Learning environment to have content-based video searching capabilities to meet diverse individual learning needs. The present paper reviewed 120+ core research article on the content based retrieval of the lecture video repositories hosted on cloud by government academic and research organization of India

MANÜEL ÖZNİTELİK ÇIKARIMI VE DERİN ÖĞRENME KULLANILARAK KUMAŞ YUMUŞAKLIĞI VE BONCUKLANMA DEĞERLERİNİN OBJEKTİF BİR ŞEKİLDE ÖLÇÜLMESİ VE SINIFLANDIRILMASI

Fabric softness is a complex tactile sensation perceived by the user even before the fabrics are worn. Softness is usually the property of surface perceived by touching or pressing a finger on the fabric surface. Fabric friction properties significantly affect the tactile sensation of the garments. The yarn used, the finishing works, and the fabric structure (weaving, knitting, etc.) affect the softness. In addition, the hardness of the water used during washing, washing movements, the amount and content of the detergent and softener used also have permanent effects on the fabric softness. Softness can be evaluated by the jury members with proven effectiveness according to the predetermined scale. Our achievement within the scope of the thesis is to eliminate the differences that may occur as a result of the subjective evaluation, which may arise from qualitative observations by basing the degree of softness evaluated qualitatively on numerical data and to obtain clearer and more precise results by adding quantitative features to the evaluation process. The methodology developed for softness assessment is also applied for another textile deterioration parameter, namely pilling, and its results are also reported.Kumaş yumuşaklığı kumaşların giyilmesinden bile önce kullanıcı tarafından algılanan karmaşık bir dokunma hissidir. Yumuşaklık genellikle kumaşın parmaklarla sıkılması veya preslenmesi ile algılanan yüzey özelliğidir. Kumaş sürtünme özellikleri, giysilerin dokunma duyumlarını büyük ölçüde etkiler. Kullanılan iplik, bitim işleri ve kumaş yapısı (dokuma, örme vb.) yumuşaklığı etkilemektedir. Bunun yanında yıkama sırasında işlem gördüğü su sertliği, yıkama hareketleri, kullanılan deterjan ve yumuşatıcının miktarı ve içeriğinden de etkilenmektedir. Görsel olarak test edilen bir diğer tekstil özelliklerinden olan yumuşaklık, etkinliği kanıtlanmış jüri üyeleri tarafından aşağıdaki skalaya göre değerlendirilebilmektedir. Tez kapsamındaki kazanımımız nitel olarak değerlendirilen yumuşaklık derecesinin, sayısal verilere dayandırılarak, nitel gözlemlerden doğabilecek görsel değerlendirme sonucu oluşacak farklılıkların giderilmesi ve değerlendirme prosesine nicel özellik kazandırarak daha net ve kesin sonuçların elde edilmesidir. Yumuşaklık için geliştirilen metodoloji değerlendirme aynı zamanda başka bir tekstil bozulma parametresi, boncuklanma için de uygulanmış ve sonuçları raporlanmıştır.M.S. - Master of Scienc