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Quality Assessment of Images Projected Using Multiple Projectors
( Muhammad Umer Kakli ),( Hassaan Saadat Qureshi ),( Muhammad Murtaza Khan ),( Rehan Hafiz ),( Yongju Cho ),( Unsang Park ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.6
Multiple projectors with partially overlapping regions can be used to project a seamless image on a large projection surface. With the advent of high-resolution photography, such systems are gaining popularity. Experts set up such projection systems by subjectively identifying the types of errors induced by the system in the projected images and rectifying them by optimizing (correcting) the parameters associated with the system. This requires substantial time and effort, thus making it difficult to set up such systems. Moreover, comparing the performance of different multi-projector display (MPD) systems becomes difficult because of the subjective nature of evaluation. In this work, we present a framework to quantitatively determine the quality of an MPD system and any image projected using such a system. We have divided the quality assessment into geometric and photometric qualities. For geometric quality assessment, we use Feature Similarity Index (FSIM) and distance-based Scale Invariant Feature Transform (SIFT). For photometric quality assessment, we propose to use a measure incorporating Spectral Angle Mapper (SAM), Intensity Magnitude Ratio (IMR) and Perceptual Color Difference (ΔE). We have tested the proposed framework and demonstrated that it provides an acceptable method for both quantitative evaluation of MPD systems and estimation of the perceptual quality of any image projected by them.
Content Aware Patch Level Geometry Scaling for TMIV
Muhammad Umer Kakli(무하마드 우머 카클리),Jun Young Jeong(정준영),Gwangsoon Lee(이광순),Jeongil Seo(서정일) 한국방송·미디어공학회 2021 한국방송공학회 학술발표대회 논문집 Vol.2021 No.6
This paper presents a scheme to downscale the patches in geometry atlas based upon its contents for MPEG Immersive Video (MIV). In proposed scheme, the geometric contents of a patch is analyzed across the intra period, and a decision is made, whether to downscale a patch or not. The patches containing homogeneous information is downscaled by half, while the patches having salient information about the object such as edges are retained. Experimental results show that the bitrate saving is achieved by incorporating the patch level downscaling.
Enhanced pruning algorithm for improving visual quality in MPEG immersive video
신홍창,정준영,이광순,Muhammad Umer Kakli,윤준영,서정일 한국전자통신연구원 2022 ETRI Journal Vol.44 No.1
The moving picture experts group (MPEG) immersive video (MIV) technology has been actively developed and standardized to efficiently deliver immersive video to viewers in order for them to experience immersion and realism in various realistic and virtual environments. Such services are provided by MIV technology, which uses multiview videos as input. The pruning process, which is an important component of MIV technology, reduces interview redundancy in multiviews videos. The primary aim of the pruning process is to reduce the amount of data that available video codec must handle. In this study, two approaches are presented to improve the existing pruning algorithm. The first method determines the order in which images are pruned. The amount of overlapping region between the source views is then used to determine the pruning order. The second method considers global region-wise color similarity to minimize matching ambiguity when determining the pruning area. The proposed methods are evaluated under common test condition of MIV, and the results show that incorporating the proposed methods can improve both objective and subjective quality.
신명철,김철환,성낙환 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.1
To maintain the high reliability and stability in the large scale electric power system for a stabilized power supplying, it requires an accurate high speed digital distance relaying techniques. For this purpose, when it comes to faults with the power system, the digital distance relaying techniques must be investigated to extract the fundamental frequency component and to predict fault location. In this thesis, it is presented the methodology of DFT(discrete Fourier transform), which accompanied aliasing, picket -fence effect, and leakage in the process of extracting fundamental frequency component and an algorithm of extracting fundamental frequency component, using the Kalman filter theory to improve upon these disadvantages. Also, a two-state and three---state Kalman filter are considered for the symmetrical components estimatin of voltages and currents respectively. It is presented an efficient digital distance relaying techniques for the purpose of extracting fundamental frequency component. Also, to confirm the validity of Kalman filtering techniques, it is shown the experimental results obtained by using the digital simulation of power system. And, it is discussed the extracted results of fundamental frequency components by means of the Fourier transform and Kalman filtering techniques.
微生物에 依한 石炭酸포화吸着粒狀活性炭의 再生에 관한 硏究
郭龍根,金東潤 부산대학교 환경문제 연구소 1987 環境硏究報 Vol.5 No.-
1. Among three microorganisms including LLMO (trade name, made in U.S.A), KIHARA (trade name, made in Japan), and the activated sludge from the Coca-cola Company in Pusan, the KIHARA resulted in the best efficieny for removal of phenol in aqueous solution. The experiments were carried out in the batch type aerator. 2. Influent with 5ppm of phenol concentration was feeded into the granular activated carbon column which was seeded by the KIHARA. Effluent phenol concentration approached to near zero. 3. It was found that the activated carbon column seeded with KIHARA had resistance to the shock loading, since the effluent phenol concentration was increased in minimal even though the influent phenol concentration was increased to 12 ppm from 5 ppm abruptly.