Vol.5 No.3 2012

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Research paper : Developing an evaluation system of visually induced motion sickness for safe usage of moving images (H. Ujike)−146−Synthesiology - English edition Vol.5 No.3 (2012) subchapter 4.4. The subjective evaluation measured every 1 minute was used as the time-series data of the biomedical effect measurement, but since it was possible to estimate the temporal variation of subjective evaluation value through multiple physiological indices as mentioned above, this VIMS evaluation model was also supported by the physiological measurement indices.5 Linkage of the technological elements and the evaluation5.1 Characteristic of the linkage of technological elementsWe constructed the VIMS evaluation system though the combination of technological elements in the previous chapter (Fig. 6). This evaluation system was software built mainly by Fukushima University. By linking the technological elements, this system has the characteristics shown below.First, the configuration enables the improvement of accuracy only by integrating and linking the individual technological elements. Therefore, it is possible to include the effect of viewing environment condition that cannot be ignored as secondary factor, independent from the effect of visual global motion that is the primary factor of VIMS. The viewing environment condition includes the display size of the image, viewing distance, brightness level, and luminosity of the surrounding. In fact, attempts were made to see the effect of the viewing environment by conducting biomedical effect measurements using the same image while changing these conditions and then modifying the output of the system based on the results.Second, a list of the time period and types of visual global motion of the images that may trigger VIMS was made, and it became possible to evaluate the degree of VIMS in the case where such motions were not included. In the VIMS evaluation model within this system, certain responses (transient and sustained responses) are output each time the speed range in which the visual global motion is present during a certain time in the image. Therefore, the effect of those visual global motions can be checked by cutting off the corresponding outputs from the model. Using this function, it is possible to check the effect of the reduction of VIMS while the image producer edits the scenes that may have effect.5.2 Evaluation of the systemFor the purpose of increasing the usability of this system, we conducted a trial questionnaire with the cooperation of the parties involved at the R&D committee discussed in chapter 3. The subjects of the questionnaire were 12 people of the image industry. According to the result of the questionnaire, the analysis speed and display received overall good marks. However, there were comments that the displayed terms were too technical and hard to understand, or that the contents of the display were difficult. Therefore, we made improvements such as using simple terms, adding glossary in the manual as needed, and improving the display content.6 Future developmentThe VIMS evaluation system is a prototype at this point, and we plan to increase the accuracy and usability through accumulation of trial questionnaire surveys. Also, the evaluation for the degree of VIMS is matched to the average value of the biomedical effect measurement. The large data Fig. 6 Control window of the VIMS evaluation systemViewing conditionsEstimated time-series value of the degree of VIMSEstimated velocity of the visual global motionList of the moving image scenes that may trigger VIMSMoving image informationMoving image controllerMoving image monitor

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