Walk Ratio: Perception of an Invariant Parameter of Human Walk on Virtual Characters

Niay, Benjamin; Olivier, Anne-Hélène; Zibrek, Katja; Pettré, Julien; Hoyet, Ludovic

doi:10.1145/3385955.3407926

Cited by 2 publications

(4 citation statements)

References 57 publications

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“…In the process of building such realism metric, we also believe that the task has to be considered. Indeed, as described in Section 3, animation features are task‐specific (e.g., walking [PMKO09, NOZ*20], dancing [TLKS08, Su16]). A possible way to consider the specificity of the task is to use the concept of motion complexity [YLYD10,PGB14,SLCK17] which helps describing the nature of the motion.…”

Section: Discussion and Future Challengesmentioning

confidence: 99%

“…In particular, characters with a high cycle rate need more frequent updates to look smooth. Niay et al [NOZ*20] investigated an invariant characteristic of gait at the lower limb level which can be a good candidate to introduce variety in walking animations while preserving realism. Authors proposed a perceptual experiment based on the Walk Ratio variable (i.e., the step length to step frequency ratio), which was proved to distinguish each individual and to be the same across different walking speeds.…”

Section: Taxonomy Of Animation Features Influencing Virtual Human Rea...mentioning

confidence: 99%

See 1 more Smart Citation

A Survey on Realistic Virtual Human Animations: Definitions, Features and Evaluations

Rekik,

Wuhrer,

Hoyet

et al. 2024

Computer Graphics Forum

Self Cite

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Generating realistic animated virtual humans is a problem that has been extensively studied with many applications in different types of virtual environments. However, the creation process of such realistic animations is challenging, especially because of the number and variety of influencing factors, that should then be identified and evaluated. In this paper, we attempt to provide a clearer understanding of how the multiple factors that have been studied in the literature impact the level of realism of animated virtual humans, by providing a survey of studies assessing their realism. This includes a review of features that have been manipulated to increase the realism of virtual humans, as well as evaluation approaches that have been developed. As the challenges of evaluating animated virtual humans in a way that agrees with human perception are still active research problems, this survey further identifies important open problems and directions for future research.

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Section: Discussion and Future Challengesmentioning

confidence: 99%

Section: Taxonomy Of Animation Features Influencing Virtual Human Rea...mentioning

confidence: 99%

A Survey on Realistic Virtual Human Animations: Definitions, Features and Evaluations

Rekik,

Wuhrer,

Hoyet

et al. 2024

Computer Graphics Forum

Self Cite

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show abstract

“…Figure 2c,d displays data from a single, healthy adult who walk at several paces from extremely slow to extremely fast for an illustrative perspectiv While the speed increased linearly through the condition, the walk ratio did not vary an stayed between 0.53 and 0.56 for the non-normalized values and between 0.48 and 0. for the normalized values. For an animation of virtual humans walking at the same spe but with different walk ratios, we advise watching the video provided as supplemental m terial in the work by Niay et al [42]. Figure 2a,b shows gait parameters from the healthy control group used to reference the developed scoring system (see Section 2.1).…”

Section: Quantifying Organization and Variabilitymentioning

confidence: 99%

“…While the speed increased linearly through the condition, the walk ratio did not vary and stayed between 0.53 and 0.56 for the non-normalized values and between 0.48 and 0.51 for the normalized values. For an animation of virtual humans walking at the same speed but with different walk ratios, we advise watching the video provided as supplemental material in the work by Niay et al [ 42 ].…”

Section: Introductionmentioning

confidence: 99%

Gauging Gait Disorders with a Method Inspired by Motor Control Theories: A Pilot Study in Friedreich’s Ataxia

Gouelle

Norman

Sharot

et al. 2021

Sensors

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To date, it has been challenging for clinicians and researchers alike to use the multiple outcome measures available to create a meaningful clinical picture and perform effective longitudinal follow-up. It has been found that instrumented gait analysis can provide information associated with a patient’s performance and help to remedy the shortcomings of the currently available outcome measures. The goal of this methodological article is to set the background and justify a new outcome measure inspired by the motor control theories to analyze gait using spatiotemporal parameters. The method is applied in a population of individuals living with Friedreich’s ataxia (FRDA), a neurodegenerative disease. The sample population consisted of 19 subjects, 11 to 65 years of age with FRDA, who either ambulated independently, with a cane, or with a rollator. Three scores based on the distance from healthy normative data were used: Organization Score, Variability Score, and an overall measurement, the Global Ambulation Score. The scores were then compared to the Scale for Assessment and Rating of Ataxia (SARA) Gait Score (SARA-GS), a clinical scale currently being used for gait analysis in FRDA. Organization Scores demonstrated a longitudinal deterioration in the gait characteristics from independent ambulators to those who ambulated with a rollator. Variability Scores mostly reflected dynamic instability, which became greater as the requirement of an ambulation aid or the switch from a cane to a rollator was imminent. The global value given by the Global Ambulation Score, which takes into consideration both the Organization Score, the Variability Score, and the level of assistive device, demonstrated a logarithmic relationship with the SARA-GS. Overall, these results highlight that both components introduced should be analyzed concurrently and suggest that the Global Ambulation Score may be a valuable outcome measure for longitudinal disease progression.

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Walk Ratio: Perception of an Invariant Parameter of Human Walk on Virtual Characters

Cited by 2 publications

References 57 publications

A Survey on Realistic Virtual Human Animations: Definitions, Features and Evaluations

A Survey on Realistic Virtual Human Animations: Definitions, Features and Evaluations

Gauging Gait Disorders with a Method Inspired by Motor Control Theories: A Pilot Study in Friedreich’s Ataxia

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