Visual and Automatic Evaluation of Vocal Fold Mucosal Waves Through Sharpness of Lateral Peaks in High-Speed Videokymographic Images

Kumar, S. Pravin; Phadke, Ketaki Vasant; Vydrová, Jitka; Novozámský, Adam; Zita, Aleš; Zitová, Barbara; Švec, Jan G.

doi:10.1016/j.jvoice.2018.08.022

Cited by 9 publications

(4 citation statements)

References 46 publications

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“… The cyclic pattern of the gelatin-based candidate exhibiting a “diamond-shaped” glottal aperture (see zoomed-in area in red), i.e., an index of the typical phase delay observed between the free edges of native vocal folds during modal voice 72 , 111 . For this hydrogel candidate, the phase difference in the motions of lower and upper margins is greater than for silicones, closer to physiology and evidenced on kymograms by the sharpness of lateral peaks 112 . This observation is noteworthy for a material whose properties have been optimized purposely to approximate the mechanics of real vocal-fold tissues under quasi-static loadings 48 .…”

Section: Resultssupporting

confidence: 53%

Flow-induced oscillations of vocal-fold replicas with tuned extensibility and material properties

Luizard,

Bailly,

Yousefi-Mashouf

et al. 2023

Sci Rep

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Human vocal folds are highly deformable non-linear oscillators. During phonation, they stretch up to 50% under the complex action of laryngeal muscles. Exploring the fluid/structure/acoustic interactions on a human-scale replica to study the role of the laryngeal muscles remains a challenge. For that purpose, we designed a novel in vitro testbed to control vocal-folds pre-phonatory deformation. The testbed was used to study the vibration and the sound production of vocal-fold replicas made of (i) silicone elastomers commonly used in voice research and (ii) a gelatin-based hydrogel we recently optimized to approximate the mechanics of vocal folds during finite strains under tension, compression and shear loadings. The geometrical and mechanical parameters measured during the experiments emphasized the effect of the vocal-fold material and pre-stretch on the vibration patterns and sounds. In particular, increasing the material stiffness increases glottal flow resistance, subglottal pressure required to sustain oscillations and vibratory fundamental frequency. In addition, although the hydrogel vocal folds only oscillate at low frequencies (close to 60 Hz), the subglottal pressure they require for that purpose is realistic (within the range 0.5–2 kPa), as well as their glottal opening and contact during a vibration cycle. The results also evidence the effect of adhesion forces on vibration and sound production.

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Section: Resultssupporting

confidence: 53%

Flow-induced oscillations of vocal-fold replicas with tuned extensibility and material properties

Luizard,

Bailly,

Yousefi-Mashouf

et al. 2023

Sci Rep

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“…Kumar et al studied the visual comfort of subjects in screen reading and paper reading under different combinations of illumination and color temperature in a small office space through a subjective evaluation experiment. e experiment set 500 LX and 750 LX illuminance and 3000 K, 4000 K, and 6500 K ambient color temperature combination conditions for these two visual tasks [8]. e experimental results show that the color temperature of the light source is very important for the visual comfort and psychological feelings of subjects.…”

Section: Literature Reviewmentioning

confidence: 99%

The Evaluation of Visual Clarity and Comfort of Light Environment in Multimedia Classroom

Dong

2022

Journal of Robotics

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In order to clarify the quantitative relationship between students’ visual clarity, comfort, and environmental brightness in the light environment of multimedia classrooms in colleges and universities and obtain the threshold and influence trends of brightness, visual clarity, and visual comfort in the light environment of the multimedia classroom, this paper proposes the research on the relevant influence parameters of the light environment of the multimedia classroom. Based on the analysis of the current situation of multimedia use in China, this paper proposes taking brightness as the main parameter of indoor light environment evaluation to carry out students’ subjective evaluation experiments. The brightness range that can reflect the visual clarity and visual comfort of the experimenter is extracted by using multimedia combined with screen projection and HDRI technology. Finally, by analyzing the experimental data, combined with the operational definition of the psychophysical threshold, the functional relationship between visual clarity, comfort, and brightness in the light environment of a multimedia classroom is obtained through regression analysis and the threshold and extreme point data are calculated. The experimental results show that when the brightness range is 370.83 cd/m2 ≤ X ≤ 558.47 cd/m2, it has better visual clarity and visual comfort. When the brightness contrast is close to 10 : 1, the visual clarity is the highest; when the brightness contrast is close to 5 : 1, the visual comfort is the highest and decreases on both sides with the change in its value. Conclusion. The results of this experimental study can provide a basis for formulating and revising relevant laws and regulations in the future and provide a reference for the light environment design of multimedia classrooms in China.

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“…Similarly, phases for the left VF are denoted φ L,I and φ L,S . The phase difference between the superior and inferior edge [23,24] for the right and left VF yields…”

Section: Left-right Vibration Asymmetry Parametersmentioning

confidence: 99%

Imaging of auto-oscillating vocal folds replicas with left–right level difference due to angular asymmetry

Bouvet

Tokuda

Pelorson

et al. 2021

Biomedical Signal Processing and Control

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Vertical level difference due to vertical angular asymmetry (up to 20 • ) between the normal (right) and tilted (left) vocal fold (VF) is experimentally assessed in the framework of unilateral vocal fold paralysis. The upstream pressure and high-speed vibration imaging for different camera view angles are assessed during steady-state auto-oscillation of three different mechanical VF replicas. A global image-based correlation allows to assess the oscillation frequency independently from the camera view angle. Resulting oscillation frequencies matches the ones obtained from aerodynamic data. Mean vibration cycles obtained from videokymographic line-scans at different positions along the posterior-anterior direction are analysed. Left-right VF displacement phase difference, axis shift and left-right mucosal wave phase difference are identified as essential parameters quantifying angular asymmetry. The influence of the degree of angular asymmetry, scan position and replica is discussed.

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Visual and Automatic Evaluation of Vocal Fold Mucosal Waves Through Sharpness of Lateral Peaks in High-Speed Videokymographic Images

Cited by 9 publications

References 46 publications

Flow-induced oscillations of vocal-fold replicas with tuned extensibility and material properties

Flow-induced oscillations of vocal-fold replicas with tuned extensibility and material properties

The Evaluation of Visual Clarity and Comfort of Light Environment in Multimedia Classroom

Imaging of auto-oscillating vocal folds replicas with left–right level difference due to angular asymmetry

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