• Title/Summary/Keyword: 3D subjective test

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Comparison of Objective Metrics and 3D Evaluation Using Upsampled Depth Map (깊이맵 업샘플링을 이용한 객관적 메트릭과 3D 평가의 비교)

  • Mahmoudpour, Saeed;Choi, Changyeol;Kim, Manbae
    • Journal of Broadcast Engineering
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    • v.20 no.2
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    • pp.204-214
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    • 2015
  • Depth map upsampling is an approach to increase the spatial resolution of depth maps obtained from a depth camera. Depth map quality is closely related to 3D perception of stereoscopic image, multi-view image and holography. In general, the performance of upsampled depth map is evaluated by PSNR (Peak Signal to Noise Ratio). On the other hand, time-consuming 3D subjective tests requiring human subjects are carried out for examining the 3D perception as well as visual fatigue for 3D contents. Therefore, if an objective metric is closely correlated with a subjective test, the latter can be replaced by the objective metric. For this, this paper proposes a best metric by investigating the relationship between diverse objective metrics and 3D subjective tests. Diverse reference and no-reference metrics are adopted to evaluate the performance of upsampled depth maps. The subjective test is performed based on DSCQS test. From the utilization and analysis of three kinds of correlations, we validated that SSIM and Edge-PSNR can replace the subjective test.

An Analysis of Visual Fatigue Caused From Distortions in 3D Video Production (3D 영상의 제작 왜곡이 시청 피로도에 미치는 영향 분석)

  • Jang, Hyung-Jun;Kim, Yong-Goo
    • Journal of Broadcast Engineering
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    • v.17 no.1
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    • pp.1-16
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    • 2012
  • In order to improve the workflow of 3D video production, this paper analyzes the visual fatigue caused from distortions in 3D video production stage through a set of subjective visual assessment tests. To establish a set of objective indicators for subjective visual tests, various distortions in production stage are investigated to be categorized into 7 representative visual-fatigue-producing factors, and to conduct visual assessment tests for each selected category, 4 test video clips are produced by combining the extent of camera movement as well as the object(s) movement in the scene. Each produced test video is distorted to reflect each of the selected 7 visual-fatigue-producing factors, and we set 7 levels of distortion for each factor, resulting in 196 5-second-long video clips for testing. Based on these test materials and the recommendation of ITU-R BT.1438, subjective visual assessment tests are conducted by 101 applicants. The test results provide a relative importance and the tolerance limit of each visual-fatigue-producing factor, which corresponds to various distortions in 3D video production field.

Investigations into the Influencing Fabric Properties Factors of the 3D Shape Evaluation of Korean Hanbok Chima

  • Park, Soon-Jee
    • International Journal of Human Ecology
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    • v.7 no.1
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    • pp.37-52
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    • 2006
  • This study was designed to analyze the three-dimensional shapes of Hanbok Chima made with various fabrics and to clarify the relationship between fabric properties as well as the objective and subjective evaluations of the 3D shape. For 3D shape data, a dress form (9A2 (N; nude)) was scanned with eight Chima garments made with the same number of fabrics. The scanner used was a non-contact three-dimensional human body measuring system belonging to Bunka Women's University in Japan. Data concerning the objective evaluation of the 3D shape was obtained from the measurements of the vertical and horizontal sections: those for subjective evaluation were through the sensory test after exposure to photographs from a front and side view. Four fabric factors were extracted from fabric physical properties: softness, extension, thickness of threads, and weight of fabric. Such factors as expansion (volume), sag of rear train, shape of nodes were influential in explaining the 3D shape of Hanbok Chima. From the analysis of the 3D shape, it can be deduced that with the constituent fabric stiffer, lighter, and less stretchable, the more expanded the 3D shape appeared to be. Multiple regression results showed that vertical shape factors have a greater effect on the evaluation of the 3D shape. It also implies that dependent variables of this study such as the subjective evaluation and 3D shape can be derived from regression equations on independent variables as fabric property factors or 3D shape factors. These results can enable the manufacturers to predict the 3D shape of the garment as well as the human subjective assessment to improve the efficacy of production. The investigation method proposed in this study can also be applicable to other garment items.

Aging Anxiety and Subjective Well-being of Persons with Mental Disorder (정신질환자의 노화불안과 주관적 안녕감)

  • Gang, Moonhee;Ko, Heesung;Lee, Jihye
    • The Journal of the Korea Contents Association
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    • v.19 no.1
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    • pp.329-338
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    • 2019
  • The purpose of this study was to examine the degree of aging anxiety and subjective well-being, and identify the effect of aging anxiety on subjective well-being among persons with mental disorder. A cross-sectional descriptive study design was used. 107 participants who were diagnosed with schizophrenia or mood disorder were recruited in D and C province. Collected data were analyzed using descriptive statistics, t-test, one-way ANOVA, Pearson correlation and multiple regression with SPSS 23.0 program. Mean score of aging anxiety and subjective well-being were $3.95{\pm}0.80$ and $3.53{\pm}0.73$ respectively. Aging anxiety had significant negative correlation with subjective well-being (r= -.48, p <.001). Aging anxiety, subjective health status, and employment status were significant influencing factors on subjective well-being, and these variables total explained for 31.1%. Therefore, it is necessary to provide a systematic and integrative strategy to cope with the aging anxiety for improving subjective well-being of person with mental disorder.

Canonical Correlation of 3D Visual Fatigue between Subjective and Physiological Measures

  • Won, Myeung Ju;Park, Sang In;Whang, Mincheol
    • Journal of the Ergonomics Society of Korea
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    • v.31 no.6
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    • pp.785-791
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    • 2012
  • Objective: The aim of this study was to investigate the correlation between 3D visual fatigue and physiological measures by canonical correlation analysis enabling to categorical correlation. Background: Few studies have been conducted to investigate the physiological mechanism underlying the visual fatigue caused by processing 3D information which may make the cognitive mechanism overloaded. However, even the previous studies lack validation in terms of the correlation between physiological variables and the visual fatigue. Method: 9 Female and 6 male subjects with a mean age of $22.53{\pm}2.55$ voluntarily participated in this experiment. All participants were asked to report how they felt about their health sate at after viewing 3D. In addition, Low & Hybrid measurement test(Event Related Potential, Steady-state Visual Evoked Potential) and for evaluating cognitive fatigue before and after viewing 3D were performed. The physiological signal were measured with subjective fatigue evaluation before and after in watching the 3D content. For this study suggesting categorical correlation, all measures were categorized into three sets such as included Visual Fatigue set(response time, subjective evaluation), Autonomic Nervous System set(PPG frequency, PPG amplitude, HF/LF ratio), Central Nervous System set(ERP amplitude P4, O1, O2, ERP latency P4, O1, O2, SSVEP S/N ratio P4, O1, O2). Then the correlation of three variables sets, canonical correlation analysis was conducted. Results: The results showed a significant correlation between visual fatigue and physiological measures. However, different variables of visual fatigue were highly correlated to respective HF/LF ratio and to ERP latency(O2). Conclusion: Response time was highly correlated to ERP latency(O2) while the subjective evaluation was to HF/LF ratio. Application: This study may provide the most significant variables for the quantitative evaluation of visual fatigue using HF/LF ratio and ERP latency based human performance and subjective fatigue.

Effects of the Complexity of 3D Modeling on the Acoustic Simulations and Auralized Sounds (3D 모델의 구체성이 건축음향 시뮬레이션 및 가청화시재에 미치는 영향)

  • Park, Chan-Jae;Haan, Chan-Hoon
    • The Journal of the Acoustical Society of Korea
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    • v.30 no.1
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    • pp.22-32
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    • 2011
  • The present study examined the effects of the complexity of the 3D models on the results of acoustic simulation which is the predominant tool of the acoustical design of buildings. Also, the effects of the 3D model on the auralized sounds were investigated. In order to carry out the study, four 3D models with different levels of complexity were introduced for a real auditorium which have different numbers of surfaces in the persuit of the guidance of odeon room acoustic software. The set-up of models was also based on the level of transition order of the program. And the acoustic experiments were performed measuring room acoustic parameters including SPL, RT, C80, D50. Acoustic computer simulations were performed using four different models. Then, the results of the computer modeling were compared with the measured acoustical parameters. In addition, sound sources were recorded in the field and auralized sounds were made in convolution with the impulse source made from acoustic modeling. Then, subjective tests were undertaken using auralized sounds. As the results, it was found that the result of the acoustic simulation were closer to the real room acoustic properties when 3D model was more particularly made. For the subjective test, the listening materials were acknowledged as similar with the real sound source when more complex 3D model was used. Then, it could be concluded that the complexity of the 3D model affects the results of the acoustic modeling as well as subjective tests.

A Study on the Development of Patterns for Pants for Men in their Early 20s and Evaluation of Subjective Wear Sensation (20대 초반의 남성을 위한 다양한 팬츠 패턴 제안 및 착용평가)

  • Jeong, Yeon-Hee
    • Journal of the Korean Society of Clothing and Textiles
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    • v.35 no.3
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    • pp.312-324
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    • 2011
  • This investigates the type of pants preferred by Korean men in their 20s through a subjective wear test. Six types of men's pants were developed as experimental garments. The male subjects were university students between the ages of 20 and 24. Subjective wear sensations of the experimental pants were rated using seven Likert scales. A 7-point Likert-type scale was used for the evaluation, with 7 indicating the best fit. As a result, a basic men's sloper for lower body clothing was developed based on SizeKorea 2004 anthropometric measurements surveyed between 2003 and 2004. A basic pattern (A) was manipulated to tight-fit pants (E) and loose-fit pants (D, L, M, and N) by considering the ease at hip level and the style. Among the six pants, pants D and L (4cm ease at hip level) were found to be superior to others in terms of comfort, fitting, and crotch depth. With regard to ease and comfort of the crotch part, pants E and A (0cm ease at hip level) were found to be the least preferred.

Comparison of Clinical Usefulness of Program-Assisted and Real Ear Measurement-Assisted Hearing Aids Fitting (프로그램과 실이 측정을 이용한 보청기 적합의 임상적 유용성의 비교)

  • Chang, Young-Soo;Jung, Hye Im;Cho, Yang-Sun
    • Korean Journal of Otorhinolaryngology-Head and Neck Surgery
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    • v.61 no.12
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    • pp.663-668
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    • 2018
  • Background and Objectives The main objectives of this study were to determine the clinical usefulness of the program-assisted and real ear measurement (REM)-assisted fitting of hearing aids. Subjects and Method Fifteen participants with moderate to moderately severe hearing loss were enrolled in this study. Objective and subjective fitting results were assessed to compare the benefits between the program-assisted fitting (using a software fitting program) and the REM-assisted fitting. Real ear insertion gain (REIG), sound-field audiometry using warble tone, and Korean Hearing in Noise Test (K-HINT) were performed as objective tests. Sound quality rating was performed as a subjective test. Results In the program fitting, 48.89% of fitting points failed to come within ${\pm}10dB$ of the REIG target. In the REM fitting, however, the percentage of failure significantly decreased to 23.33% (p=0.013). In K-HINT test, the reception threshold for speech in quiet situation significantly decreased from 50.1 dB HL with the program fitting to 44.7 dB HL after the REM fitting (p<0.001). In front noise condition, signal-to-noise ratio improved from 4.53 dB to 3.50 dB with the REM fitting without statistical significance (p=0.099). In the sound quality rating, the REM fitting ($4.27{\pm}0.56$) showed a significantly better sound quality ratings than the program fitting ($3.69{\pm}0.74$) (p=0.017). Conclusion The REM fitting showed better results in both subjective and objective measurements than the program fitting.

Study of Efficiency Test and Subjective Responses about Pendent Task Lighting System Using Phosphor Luminescent Film LED (광기여 필름 LED 팬던트 작업조명시스템 주관평가와 성능검증)

  • Cha, Kwang-Seok;Kim, Hway-Suh
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.23 no.3
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    • pp.188-193
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    • 2011
  • For a long time work or study, pendent task lighting system prepared with phosphor luminescent film LED was developed for eye protection and working efficiency improvement. Developed lighting system was used together with pendent and ambient lighting. Such as, we made comfortable lighting environment system. Evaluation for developed lighting system, that had proceeded to Mock-up test and subjective evaluation. Also It had proceeded that lighting environment analyzed and compatibility valuation of installation. In subjective evaluation, the students have expressed themselves satisfied to phosphor luminescent film LED lighting system. In Mock-up test, It is not problem to intensity of illumination, luminance and color temperature. Therefore, developed LED lighting system was installed at the Daegu apartment. It is having a P.O.E study progress to phosphor luminescent film LED lighting system.

Stereo-video Synchronization for 3D Video Transmission (3차원 비디오 전송을 위한 스테레오비디오 동기화 방법)

  • Lee, Dong-Jin;Lee, Seon-Oh;Sim, Dong-Gyu;Lee, Hyuk-Joon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.4B
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    • pp.349-359
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    • 2009
  • In this paper, we propose a stereo-video transmission method for reduction of delay and maximization of 3D effect. Conventional multimedia synchronization algorithms were designed to achieve minimum delay and synchronize multiple video and audio streams, however, they could not be effective for 3D video transmission. In this paper, we proposed a synchronization algorithm by considering the minimum error of time difference between streams for 3D effect. The minimum error of time difference for 3D effect was derived based on a 3D subjective quality test. We compute display time of the delivered videos within the allowed time-difference and the video are displayed according to the display time. To evaluate the performance of the proposed algorithm, we implemented a real-time video communication system and subjective quality test has been conducted with the proposed system. We found that video quality displayed by the proposed system. We found that video quality displayed by the proposed algorithm ranks 'good' and 'excellent' in the DMOS (Differential Mean Opinion Score) scale, based on the MOS (Mean Opinion Score) test.