The tempo-structural fisheye slider for navigation in web lectures
Time-based slider interfaces haven proven to be an intuitive and effective means for navigation in web lectures and other video content. They allow users to easily navigate to arbitrary positions in the video and clearly visualize the video's linear structure. They do, however, lack any contextual information about the video's content at these positions. Earlier approaches have tackled this shortcoming by visualizing slide titles or slide previews on the timeline. The approach presented in this paper goes one step further in that it links the current slider position to a fisheye-style view of the lecture slide overview. The fisheye shows the slide playing at the current position in full detail and even in the corresponding animation step - if animated. It also shows the neighboring slides' previews and visually maps them to the timeline, thus providing contextual information on the current slider position while still maintaining a global overview.