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Runtime Software Monitoring Based on Binary Code Translation for Real-Time Software
( Kiho Choi ),( Seongseop Kim ),( Daejin Park ),( Jeonghun Cho ) 한국정보처리학회 2019 Journal of information processing systems Vol.15 No.6
Real-time embedded systems have become pervasive in general industry. They also began to be applied in such domains as avionics, automotive, aerospace, healthcare, and industrial Internet. However, the system failure of such domains could result in catastrophic consequences. Runtime software testing is required in such domains that demands very high accuracy. Traditional runtime software testing based on handwork is very inefficient and time consuming. Hence, test automation methodologies in runtime is demanding. In this paper, we introduce a software testing system that translates a real-time software into a monitorable real-time software. The monitorable real-time software means the software provides the monitoring information in runtime. The monitoring target are time constraints of the input real-time software. We anticipate that our system lessens the burden of runtime software testing.
Royalty-Free Video Coding Standards in MPEG [Standards in a Nutshell]
Choi, Kiho,Jang, Euee S. IEEE 2014 IEEE signal processing magazine Vol.31 No.1
<P>On 7 March 2013, the Moving Picture Experts Group Licensing Association (MPEG LA) and Google announced that they have entered into an agreement granting Google a license to techniques, if the patents in MPEG LA might be essential to VP8. Under this agreement, hardware and software companies are free to use the VP8 technology when developing their own products. Considering that it is now common to find patent disputes in headline news, the patent issues related to video coding standards are no exception. In this article, we report on the recent developments in royalty-free codec standardization in MPEG, particularly Internet video coding (IVC), Web video coding (WVC), and video coding for browser, by reviewing the history of royalty-free standards in MPEG and the relationship between standards and patents.</P>
Runtime Software Monitoring Based on Binary Code Translation for Real-Time Software
Choi, Kiho,Kim, Seongseop,Park, Daejin,Cho, Jeonghun Korea Information Processing Society 2019 Journal of information processing systems Vol.15 No.6
Real-time embedded systems have become pervasive in general industry. They also began to be applied in such domains as avionics, automotive, aerospace, healthcare, and industrial Internet. However, the system failure of such domains could result in catastrophic consequences. Runtime software testing is required in such domains that demands very high accuracy. Traditional runtime software testing based on handwork is very inefficient and time consuming. Hence, test automation methodologies in runtime is demanding. In this paper, we introduce a software testing system that translates a real-time software into a monitorable real-time software. The monitorable real-time software means the software provides the monitoring information in runtime. The monitoring target are time constraints of the input real-time software. We anticipate that our system lessens the burden of runtime software testing.
Early TU decision method for fast video encoding in high efficiency video coding
Kiho Choi,Jang, Euee S. IET 2012 Electronics letters Vol.48 No.12
<P>Proposed is an early transform unit (TU) decision method for high efficiency video coding (HEVC) by early determination of the TU sizes based on coding tree pruning. Although the coding efficiency in HEVC can be improved by using various transform block sizes, the computational complexity increased dramatically in terms of the transform kernel size and the transform coding structure. A simple TU decision algorithm is proposed that can prune a residual quadtree in the early stages based on the number of nonzero DCT coefficients. Experimental results show that the proposed method achieves a 61% reduction in TU processing time compared to the HEVC test model 3.0 encoder with a little gain in coding performance.</P>
Zero coefficient-aware IDCT algorithm for fast video decoding
Kiho Choi,Sunyoung Lee,Jang, E S IEEE 2010 IEEE transactions on consumer electronics Vol.56 No.3
<P>Ever since many well-known image and video coding standards such as JPEG, MPEG, and H.26x started using DCT as a core process in data compression, the design of the fast inverse discrete cosine transform (IDCT) has been an intensive research topic. Most research has focused on a reduction of the number of operations using the butterfly structure. However, the majority of DCT coefficients is zero after quantization and is therefore redundant for IDCT computation. Therefore, we exploited this DCT coefficients redundancy to propose a zero coefficient-aware IDCT algorithm for fast decoding. The proposed method significantly reduces the number of IDCT operations by adaptively including non-zero coefficients in the calculation and employing a table look-up to eliminate multiplication operations in the IDCT process. The proposed zero coefficient-ware algorithm outperformed other existing fast IDCT algorithms in terms of operational complexity. Moreover, the running time was faster than butterfly based IDCT algorithms implemented in MPEG-4 simple profile decoder by a speedup factor of 1.32 times for the SIF/CIF sequences and up to 2.18 times for the HD sequences.</P>
An Efficient AVC/H. 264 Intra Mode Scheme for Visual Quality Improvement
Kiho Choi,Kihoon Lee,Gyeong Gi Noh,Euee S. Jang 한국멀티미디어학회 2011 한국멀티미디어학회 국제학술대회 Vol.2011 No.-
In this paper, we propose an efficient intra mode scheme for visual quality improvement in AVC/H.264. In AVC/H.264 intra prediction, spatial neighboring blocks are used to predict the current block pixels. While the pixels in the left and top positions of the current block can be predicted accurately, the prediction of the pixels in the right and bottom positions is not as effective due to low correlation between the reconstructed and current pixels. This affects visual quality of reconstructed video quality substantially. Here, we propose an efficient intra mode scheme, which adaptively adjusts the predictive value for intra prediction by using the differential values of the neighbor blocks. The experimental results show that the proposed method implemented in the AVC/H.264 reference software produced the better visual quality than that of conventional intra prediction without any loss in compression efficiency.
Leveraging Parallel Computing in Modern Video Coding Standards
Choi, Kiho,Jang, Euee S. IEEE 2012 IEEE multimedia Vol.19 No.3
<P>Video coding has always been a computationally intensive process. Although dramatic improvements in coding efficiency have been realized in recent years, the algorithms have become increasingly complex and there is a broader recognition that it is necessary to realize the capabilities of multicore processors. This article discusses how recent trends in parallel computing have influenced the design of modern video coding standards. Specifically, the authors discuss how the High Efficiency Video Coding (HEVC) standard, which is being jointly developed by ISO/IEC JTC1/SC29 WG11 (MPEG) and ITU-T SH16/Q.6 (VCEG), is looking at ways to implement the co-exploration between algorithm and architecture (CEAA) approach.</P>