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Overview of View Synthesis Prediction for Multi-view Video Coding
Yo-Sung Ho,Cheon Lee,Kwan-Jung Oh 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
With a wide range of viewing angles, the multi-view video can provide more realistic feeling at arbitrary viewpoints. However, because of a huge amount of data from multiple cameras, we need to develop an efficient coding method. One of the promising approaches for multi-view video coding is view synthesis prediction which generates an additional reference frame. In this paper, we explain the principal idea of view synthesis prediction and propose a view interpolation and coding scheme. For view interpolation, we employ initial disparity estimation, variable block matching, and disparity error correction methods. After generating an intermediate view image, we apply a ‘VIP Ppicture’ coding method with the additional reference frame, where we have five additional motion estimation modes and a modified motion vector prediction scheme. By computer simulations, we have improved the coding gain by 0.66 ㏈ on average for the well synthesized sequences.
Multi-view Depth Map Estimation Enhancing Temporal Consistency
Sang-Beom Lee,Yo-Sung Ho 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we propose a scheme for multiview depth map estimation to enhance temporal consistency. After we divide the center image into several segments, we estimate one depth value for each segment using 3-D warping and segment-based matching techniques. In the refinement process, we apply a segment-based belief propagation algorithm. In order to enhance temporal consistency and reliability of the depth map, we define a temporally weighted matching function and apply in the initial depth estimation step. We also apply a temporal postprocessing operation to the refined depth map. Experimental results show that the final depth sequence has improved temporal consistency with reduced errors.
Generation of ROI Enhanced Depth Maps Using Stereoscopic Cameras and a Depth Camera
Sung-Yeol Kim,Eun-Kyung Lee,Yo-Sung Ho IEEE 2008 IEEE transactions on broadcasting Vol.54 No.4
<P>In this paper, we propose a new scheme to generate region-of-interest (ROI) enhanced depth maps combining one low-resolution depth camera with high-resolution stereoscopic cameras. Basically, the hybrid camera system produces four synchronized images at each frame: left and right images from the stereoscopic cameras, a color image and its associated depth map from the depth camera. In the hybrid camera system, after estimating initial depth information for the left image using a stereo matching algorithm, we project depths obtained from the depth camera onto ROI of the left image using three-dimensional (3-D) image warping. Then, the warped depths are linearly interpolated to fill depth holes occurred in ROI. Finally, we merge the ROI depths with background ones extracted from the initial depth information to generate the ROI enhanced depth map. Experimental results show that the proposed depth acquisition system provides more accurate depth information for ROI than previous stereo matching algorithms. Besides, the proposed scheme minimizes inherent problems of the current depth camera, such as limitation of its measuring distance and production of low-resolution depth maps.</P>
Sang Ho Park,남경화,Yo Han Ho 대한신생아학회 2020 Neonatal medicine Vol.27 No.3
Incontinentia pigmenti (IP), also known as Bloch-Sulzberger syndrome, is a rare X-linked dominant disorder that is generally lethal to males and almost always leads to death in utero. This disorder is a genodermatosis with characteristic cutaneous lesions and manifestations affecting the eyes, teeth, hair, and central nervous system. Genodermatosis is a hereditary disease caused by mutations in the nuclear factor-kappa B essential modulator gene mapped to chromosome Xq28. This gene encodes a variety of cytokines and chemokine regulators and is indispensable for protecting cells from tumor necrosis factor-induced apoptosis. Here we describe a case of male newborn with vesiculobullous cutaneous lesions over the left thigh and leg. We first considered the cutaneous lesions a skin infection, as they improved with intravenous antibiotics. However, recurrence and the need for repeated hospitalizations made us consider the differential diagnosis of IP, for which we performed a skin biopsy and chromosome analysis. The histology results were compatible with IP, that is, eosinophilic infiltration in the dermis and epidermis, and individual cell dyskeratinization. The chromosome analysis result was a normal 46, XY karyotype. Here we report the case of a male newborn with IP that manifested as multiple vesiculobullous skin lesions and was initially misdiagnosed as a recurrent skin infection.
Three-dimensional Video Generation for Realistic Broadcasting Services
Yo-Sung Ho,Sung-Yeol Kim,Eun-Kyung Lee 대한전자공학회 2008 ITC-CSCC :International Technical Conference on Ci Vol.2008 No.7
In this paper, we propose a new scheme to generate multi-view video-plus-depth using a hybrid camera system, which is composed of one depth camera and multiple video cameras. In order to create the threedimensional (3-D) video, we first calculate the initial disparity for each view by projecting depth camera data onto each video camera using 3-D image warping. Then, a stereo matching algorithm is applyed to estimate the final disparity from the initial disparity in each view. Finally, we convert the final disparity into depth information in each frame to generate a multi-view depth map. Experimental results show that the proposed hybrid camera system not only provides high-qualtiy depth information for 3-D realistic broadcasting services, but also minimizes inherent problems of the conventional depth camera system.
Is There Any Difference of Microorganism Between Past and Present in Acute Cholangitic Patients?
( Yo Han Jeong ),( Kyeong Ok Kim ),( Jay Song ),( Si Hyung Lee ),( Tae Nyeun Kim ),( Ho Chan Lee ),( Sung Bum Kim ),( Jae Hyun Park ),( Kook Hyun Kim ),( Byung Ik Jang ),( Se Hoon Sohn ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Recently, antibiotics resistant microorganism, particularly extended- spectrum beta-lactamase (ESBL)-producing organisms have been increased. Theaim of this study was to analyze the change of microorganism and origin of infection between past (2000-2006, group A) and present (2007-2013, group B) in patients with acute cholangitis. Methods: Of the acute cholangitic patients from Jan 2000 to Dec 2013, a systemic review of 896 patients having positive blood and/or bile culture (293 in group A vs. 603 in group B) was conducted retrospectively. They were further classifi ed into the two subgroups: community- and hospital-acquired infection. Bile culture was obtained via ENBD catheter. Results: In blood culture, the most common microorganism was E.coli [43.3% vs 41.8%] between group A and B. ESBL-producing E.coli was significantly higher in group B [13.6% vs 6.2%, p= 0.001]. The numbers of patients with bile culture-positive were 123 in group A and 196 in group B. In bile culture, the most common pathogen was E.coli [58.5% vs 45.4%] between group A and B. ESBL-producing E.coli was signifi cantly higher in group B [22.4% vs 4.8%, p=0.001]. The numbers of patients with community-acquired infection was higher than hospital-acquired infection (71.9% vs 28.9%, respectively). In community-acquired infection, ESBL-producing E.coli was signifi cantly higher in group B both in the blood culture [11.2% vs 5.6%, p=0.021] and in the bile culture [6.4% vs 2.3%, p=0.025]. In hospital-acquired infection, ESBL-producing E.coli was signifi cantly higher in group B both in the blood culture [19% vs 8.0%, p=0.028] and in the bile culture [9.2% vs 1.3%, p=0.023]. Conclusions: The numbers of ESBL-producing E.coli has been increased recently. The physicians must keep in mind that ESBL-producing E.coli is the causative pathogen in patients with acute cholangitis, irrespective of whether community or hospital-acquired infection.
( Yo Han Cho ),( Jae Wan Cho ),( Hyun Wook Ryoo ),( Sungbae Moon ),( Jung Ho Kim ),( Sang-hun Lee ),( Tae Chang Jang ),( Dong Eun Lee ) 영남대학교 의과대학 2022 Yeungnam University Journal of Medicine Vol.39 No.1
Background: To prepare for future work stoppages in the medical industry, this study aimed to identify the effects of healthcare worker strikes on the mortality rate of patients visiting the emergency department (ED) at six training hospitals in Daegu, South Korea. Methods: We used a retrospective, cross-sectional, multicenter design to analyze the medical records of patients who visited six training hospitals in Daegu (August 21-September 8, 2020). For comparison, control period 1 was set as the same period in the previous year (August 21-September 8, 2019) and control period 2 was set as July 1-19, 2020. Patient characteristics including age, sex, and time of ED visit were investigated along with mode of arrival, length of ED stay, and in-hospital mortality. The experimental and control groups were compared using t-tests, and Mann-Whitney U-test, chi-square test, and Fisher exact tests, as appropriate. Univariate logistic regression was performed to identify significant factors, followed by multivariate logistic regression analysis. Results: During the study period, 31,357 patients visited the ED, of which 7,749 belonged to the experimental group. Control periods 1 and 2 included 13,100 and 10,243 patients, respectively. No significant in-hospital mortality differences were found between strike periods; however, the results showed statistically significant differences in the length of ED stay. Conclusion: The ED resident strike did not influence the mortality rate of patients who visited the EDs of six training hospitals in Daegu. Furthermore, the number of patients admitted and the length of ED stay decreased during the strike period.
(Sang Ah Chang),(Bong Yun Cha),(Soon Jib Yoo),(Yo Bae Ahn),(Ki Ho Song),(Je Ho Han),(Jong Min Lee),(Hyun Sik Son),(Kun Ho Yoon),(Moo Il Kang),(Kwang Woo Lee),(Ho Young Son),(Sung Ku Kang) 대한내과학회 2001 The Korean Journal of Internal Medicine Vol.16 No.2
N/A Background : It has been reported that many peripheral vasodilating drugs might improve insulin resistance. Cilostazol, a antithrombotic agent, increases peripheral blood flow in non-insulin dependent diabetic patients. The effect of cilostazol treatment on insulin resistance in streptozotocin (STZ)-induced non-insulin dependent diabetic Wistar rats was examined. Methods : About a half of two-day old neonate siblings were injected intraperitoneally with STZ and maintained for six months, at which time they were compared with age-matched control rats for intraperitoneal glucose tolerance test (IPGTT) and for glucose infusion rate (GINF) in a euglycemic hyperinsulinemic glucose-clamp study. After that, these studies were also performed after feeding rat chow containing cilostazol (100 mg/kg/day) to rats with STZ-induced non-insulin dependent diabetes mellitus for four-weeks and compared with those of age-matched control rats. Results : In the intraperitoneal glucose tolerance test studies, plasma glucose levels of STZ-induced non-insulin dependent diabetic rats were significantly higher and plasma insulin levels significantly lower than those of age-matched control rats in the age of six months. Glucose infusion rate was lower in STZ-induced non-insulin dependent diabetic rats than those of age-matched control rats. However, after a four-week cilostazol treatment, glucose infusion rate of STZ-induced non-insulin dependent diabetic rats was not significantly different from that of control rats. Conclusion : These findings suggested that cilostazol may improve insulin resistance in STZ-induced non-insulin dependent diabetic rats.