動態RSVP影像呈現介面之使用性評估-以網路書店為例

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Title:	動態RSVP影像呈現介面之使用性評估-以網路書店為例
Other Titles:	Usability Evaluation of Dynamic Rapid Serial Visual Presentation on E-Bookstores
Authors:	林達羲 Lin, Darcy
Contributors:	林雅俐 Lin, Ya-Lin 東海大學統計學系
Keywords:	主觀偏好、快速序列視覺呈現、可用性評估、視覺疲勞度(CFF) Subjective Preference, Rapid Serial Visual Presentation (RSVP), Usability Evaluation, Visual Fatigue (CFF)
Date:	2009
Issue Date:	2011-02-18T07:15:49Z (UTC)
Abstract:	網路隨著資訊發展漸趨蓬勃，在龐大的資料流中有效的尋找有用的資訊亦顯得重要。本研究應用網路書店之搜尋結果，結合快速序列視覺呈現(Rapid Serial Visual Presentation, 簡稱RSVP)，以及圖片移動速度，移動方向以及圖片之大小，設計一個正確性高，且符合可用性之模擬介面，藉以探討搜尋結果的瀏覽與找尋之辨認正確性的績效、使用RSVP 後對於視覺疲勞度的影響，以及利用問卷獲得使用者對於本介面之使用者經驗。使用者主觀性偏好中，使用者偏好物架型RSVP的移動方向為由左下收縮至右上、移動速度為影格速率20-30 FPS；旋轉木馬型RSVP 則偏好順時針旋轉、速度為10 和15 FPS；當物架型RSVP速度較慢時，較可以吸引受試者的目光。此外搜尋結果的RSVP動態影像呈現滿足使用者的經驗、美學與極簡的設計、最少的動作、和易學性等可用性評估準則。可用性實驗採用直交表，探討RSVP與圖片移動速度、RSVP與其移動方向、RSVP與圖片大小之交互作用。實驗因子RSVP分為旋轉木馬型，物架型與傳統型；移動速度分為影格速率15 FPS, 30 FPS, 45 FPS；圖片大小分為100%100%，125%125%，150%150%；圖片移動方向為由左至右，由右至左與同一時間顯示五張圖片等組合。實驗結果得到，在搜尋結果之辨識正確率中，正確率極高，表示使用者在搜尋結果有極佳的效率和正確性；在瀏覽搜尋之辨識正確率中，RSVP與移動速度、RSVP與圖片大小的交互作用有顯著影響，其中以旋轉木馬型配上15 FPS與150%150%圖片大小這個組合的瀏覽辨識正確率高達0.99，為所有組合中最高。在RSVP搜尋影響視覺疲勞中，得到RSVP與移動速度、RSVP與移動方向皆對視覺疲勞度有顯著影響，其中傳統型搭配45 FPS、以及方向由右至左這個組合的視覺疲勞度最高，在設計上應避免。最後使用者的主觀使用經驗滿意度，使用者對於可學習性、可記憶性、效率性以及滿意度都達到使用者滿意度之需求，且RSVP與移動速度、RSVP與移動方向亦對使用者介面滿意度有顯著影響，滿意度最高為物架型搭配45 FPS與固定位置同時展示五張圖片的組合。由此可知本RSVP介面不僅能提高正確的搜尋瀏覽結果，也能符合使用者滿意度需求。 With the popularity of Web, it is much important to search useful information in a huge number of data stream. To find an optimal user interface, we focused on the design factors to investigate the user-centered RSVP interface on E-bookstore. In the subjective preference evaluation, the results indicate that the shelf display moving to upper right hand side along a linear trajectory and decreasing in size gradually, moving speed of 20-30 frames per second (FPS), and exposure time of 6.67-10 seconds are preferable. The carousel mode following clockwise trajectory to the opposite side, moving speed of 10-15FPS, and exposure time of 13.33-20 seconds are preferable. “Meets user experience”, “aesthetic and simple design”, “simple operation”, and “easy to learn” all meet the criteria of usability evaluation. The design of orthogonal array is to collect the visual performance and visual fatigue. Factors of experiment are RSVP (carousel, convention and shelf mode), moving speed (15 FPS, 30 FPS and 45 FPS), moving direction (right-hand side oriented, left-hand side oriented and fixed position at the same time) and maximum size of image(100%100%, 125%125% and 150%*150%). The results of experiment show a good performance on searching. In addition, in browsing the result of searching, the interactions of RSVP×moving speed and RSVP×image size are significant to correct recognition, and the combination of carousel mode, 15FPS, 150%150%of image size has the highest recognized correction rate, 0.99. In the visual fatigue, RSVP×moving speed and RSVP×moving direction have significant effects on the visual fatigue, and the combination of highest visual fatigue: Convention mode, 45FPS, and orient from right should be prevented. The usability proposed of Nielsen (1993) including learnability, memoribility, efficiency and user satisfaction are all satisfied, and RSVP×moving speed and RSVP×moving direction are significant on user interface satisfaction, where the largest is shelf mode with 45 FPS and illustrated 5 images at fixed position. Therefore, the RSVP interface is really can not only improve searching efficient but also satisfy user satisfaction.
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