• 제목/요약/키워드: Quality Assessment

검색결과 4,799건 처리시간 0.038초

철도영상전송시스템의 화질평가방안에 관한 연구 (A study on the Quality Assessment Method on Railway Video Transmission System)

  • 장석각;조봉관
    • 한국철도학회:학술대회논문집
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    • 한국철도학회 2004년도 추계학술대회 논문집
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    • pp.1247-1252
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    • 2004
  • A objective quality assessment for the evaluation performance of a video transmission system as a basic step for construction of digital video transmission system between the spots and headquarter. Due to a limit of an analog video transmission system and the developments of various digital media and digital video standards, the need of introduce of a digital system are increased gradual1y, At this points. previously performance evaluations are performed and the quality assessment is the most important thing. We can be divided quality assessment method by the subjective quality assessment and objective quality assessment. The subjective quality assessment method has some problems which are required high cost and much time to evaluate the quality, And because existing objective quality assessment method such that PSNR are based on an analog form, the correlation with subjective data is very low. Therefore we design a new objective quality assessment method using Gabor wavelet transform reflecting HVS(Human Visual System), Designed objective quality assessment method is superior to other objective method such that PSNR or EPSNR In this paper, we proposed objective quality assessment using Gabor wavelet can be used for performance evaluation and verification of video transmission system.

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Video Quality Assessment based on Deep Neural Network

  • Zhiming Shi
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제17권8호
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    • pp.2053-2067
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    • 2023
  • This paper proposes two video quality assessment methods based on deep neural network. (i)The first method uses the IQF-CNN (convolution neural network based on image quality features) to build image quality assessment method. The LIVE image database is used to test this method, the experiment show that it is effective. Therefore, this method is extended to the video quality assessment. At first every image frame of video is predicted, next the relationship between different image frames are analyzed by the hysteresis function and different window function to improve the accuracy of video quality assessment. (ii)The second method proposes a video quality assessment method based on convolution neural network (CNN) and gated circular unit network (GRU). First, the spatial features of video frames are extracted using CNN network, next the temporal features of the video frame using GRU network. Finally the extracted temporal and spatial features are analyzed by full connection layer of CNN network to obtain the video quality assessment score. All the above proposed methods are verified on the video databases, and compared with other methods.

Using Fuzzy Neural Network to Assess Network Video Quality

  • Shi, Zhiming
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제16권7호
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    • pp.2377-2389
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    • 2022
  • At present people have higher and higher requirements for network video quality, but video quality will be impaired by various factors, so video quality assessment has become more and more important. This paper focuses on the video quality assessment method using different fuzzy neural networks. Firstly, the main factors that impair the video quality are introduced, such as unit time jamming times, average pause time, blur degree and block effect. Secondly, two fuzzy neural network models are used to build the objective assessment method. By adjusting the network structure to optimize the assessment model, the objective assessment value of video quality is obtained. Meanwhile the advantages and disadvantages of the two models are analysed. Lastly, the proposed method is compared with many recent related assessment methods. This paper will give the experimental results and the detail of assessment process.

QFD Model for Quality Performance Self-assessment

  • Liu, Yumin;Xu, Jichao
    • International Journal of Quality Innovation
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    • 제7권1호
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    • pp.112-127
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    • 2006
  • How to measure Quality Performance (QP) or excellence performance in organizations is very important for improving the quality of an organization's products and services. This paper takes Quality Function Deployment (QFD) as a useful tool to identify the key characteristics of quality performance and measure the influence factors on quality performance. Most national quality awards provide a framework of the criteria to show the essential elements of an organization's quality performance and get the Quality Performance Score (QPS) by self-assessment using the criteria. By means of these criteria, especially, the criteria of China Quality Award (CQA), a measurable indicator system for quality performance is set up. A four-phase QFD model of assessment for quality performance is developed. This QFD model not only presents the most important efforts for the deployment of the measurable indicators of quality performance, but also takes great advantage of evaluating the quality performance and obtaining the quality performance score. The measurable indicator hierarchy of quality performance is formed and its implementation method for assessment quality performance is described in this paper.

Accurate Camera Self-Calibration based on Image Quality Assessment

  • Fayyaz, Rabia;Rhee, Eun Joo
    • Journal of Information Technology Applications and Management
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    • 제25권2호
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    • pp.41-52
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    • 2018
  • This paper presents a method for accurate camera self-calibration based on SIFT Feature Detection and image quality assessment. We performed image quality assessment to select high quality images for the camera self-calibration process. We defined high quality images as those that contain little or no blur, and have maximum contrast among images captured within a short period. The image quality assessment includes blur detection and contrast assessment. Blur detection is based on the statistical analysis of energy and standard deviation of high frequency components of the images using Discrete Cosine Transform. Contrast assessment is based on contrast measurement and selection of the high contrast images among some images captured in a short period. Experimental results show little or no distortion in the perspective view of the images. Thus, the suggested method achieves camera self-calibration accuracy of approximately 93%.

데이터베이스 시스템 품질 평가 모듈 개발에 관한 연구 (A Study on the Development of the Quality Assessment Modules of Database System)

  • 박미영;김민정;승현우
    • 한국도서관정보학회지
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    • 제39권4호
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    • pp.305-329
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    • 2008
  • 본 연구는 데이터베이스 시스템 품질 개선 성숙도 모델의 필요성을 인식하고 우선 일차연구로 데이터베이스 시스템 품질 평가에 적용할 수 있는 품질 평가 모듈을 개발하고자 한다. 데이터베이스 시스템 품질 관리 및 개선을 위해서는 데이터베이스 시스템 품질을 체계적으로 평가하기 위한 평가 모듈이 필요하다. 이러한 필요성에 따라 본 연구는 다음의 목적을 수행한다. 첫째 데이터베이스 시스템 품질 평가를 위해 ISO/IEC 9126시리즈를 기반으로 품질평가 특성과 부특성을 선정하고 평가 모듈(메트릭)을 개발한다. 둘째 산업계와 학계간에 인지하고 있는 품질 평가특성의 중요도에 대해 비교 분석한다. 품질 평가 모듈을 개발하여 정량적 평가에 적용할 수 있는 이론적 실증적 토대를 마련하였다는 점에서 중요한 의의를 갖으며 이는 데이터베이스 시스템 품질 평가에 대한 연구의 기초자료로 활용될 수 있을 것이다. 또한 후속연구에서는 데이터베이스 시스템 품질 평가를 통해 품질을 개선할 수 있는 품질 개선 성숙도 모델을 개발하는 연구로 진행되어야 할 것이다.

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요양병원의 입원급여 적정성 평가 결과에 미치는 영향 요인 분석 (Factors influencing the composite quality score from the quality assessment program for long-term care hospitals)

  • 이상갑;설진주;이광수
    • 한국병원경영학회지
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    • 제25권3호
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    • pp.78-86
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    • 2020
  • Purposes: This study purposed to identify factors influencing the composite quality score from the quality assessment program for long-term care hospitals Methodology: The study variables was obtained from HIRA(Health Insurance Review and Assessment Service): the composite quality scores and hospital variables such as number of doctors, nurses, beds, medical technicians, medical equipments, administrative region, ownerships from 3rd (2010) to 7th (2018) quality assessment program. National Statistical Portal(www.kosis.go.kr) provided the number of senior citizens aged over 65 in city·county·district area. SAS 9.4 was used for the data processing and used to analyze the data. Findings: The results showed that composite quality score increased past 9 years. Hospital variables such as number of doctor, nurse, medical technicians, bed and public hospitals had significant positive relationship with the composite quality score. Administrative region(district) showed higher scores compare to that of city. Compare to the score of quality assessment year(2010), as the assessment year move to 2012, 2013, 2015, 2018, results showed higher significant positive coefficients. Practical Implication: Continuously improve the performance of long-term care hospitals, current quality assessment program are needed to update their system such as adopting indicators measuring the service process, or compensating the cost for quality assessment program. It will enable to provide more reasonable and accurate performance assessment scores.

결핵 적정성 평가에 따른 국내 결핵 진료서비스 질 관리 현황 (Change in Quality of Tuberculosis (TB) Care since National Quality Assessment Program of TB Healthcare Service)

  • 장성자;황미진;이충훈;이현주;심태선;김동숙
    • 한국의료질향상학회지
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    • 제27권2호
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    • pp.73-82
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    • 2021
  • Purpose: This study aims to examine the quality of tuberculosis (TB) care after the 1st to 3rd national quality assessment (QA) program for TB healthcare service in Korea was conducted. Methods: We analyzed Health Insurance Review & Assessment Service (HIRA) claims data of new TB patients during the period of January to June from 2018-2020. The new TB patients were defined as TB patients reported to Korea Centers for Disease Control and Prevention Agency (KCDA). The unit of analysis was the patient. Chi-square tests were used to analyze the differences in indicator value according to the types of medical facilities. The QA indicators of TB care were divided into 3 areas consisting of the following 7 quality indicators: 4 indicators of diagnosis test (the rate of acid-fast bacilli smear, the rate of acid-fast bacilli culture, the rate of Mycobacterium tuberculosis-polymerase chain reaction, drug susceptibility test), 1 compliance of treatment guideline, and 2 indicators of care management of TB patients (encounter rate, day of therapy). Results: The QA program for TB care was conducted among 8,246 patients from 534 facilities in 2020. The value of the 7 quality indicators was shown to increase as a result of the QA program. The indicators of the diagnostic test were all higher than 95%, with the exception of the drug susceptibility test which was 84.8%. Both indicators for care management of TB patients were 88.5%. Conclusion: The quality of TB care has been improving with the implementation of the QA program. In order to continue to improve the quality of TB care, it will be necessary to disclose the results of the QA program in medical facilities in the future.

캐비닛 엑스선 검색장비 이미지품질평가 고도화 방안 연구 (Improving Imaging Quality Assessment of Cabinet X-Ray Security Systems)

  • 윤연아;정진형;김용수
    • 품질경영학회지
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    • 제49권1호
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    • pp.47-60
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    • 2021
  • Purpose: This study proposes methods and procedures for evaluating imaging security systems quality of cabinet x-ray screening system to enhance performance certification technology. Also, conducted a comparative analysis of the literature of test-kit for imaging security quality evaluation. Methods: Comparative analysis of the test-kits and related documents for image quality assessment of cabinet x-ray screening equipment. This allows assessment items were selected and the methods for each assessment item were proposed. In addition, the configuration method of the assessment team was established by applying the technology readiness assessment(TRA). Results: Four of the assessment items were selected when estimate image quality by a comparative analysis of literature. For each assessment item, the evaluation method and minimum level of availability were determined. Finally, this paper proposes an imaging quality assessment of cabinet X-ray imaging security systems. Conclusion: Development of imaging security systems evaluation procedures for cabinet X-ray screening systems can be help improve performance certification of aviation security equipment.