Research And Design Of Pressure - Based Interactive Technology In Pen + Touch Interface

With the rapid development of hardware technology, devices that support the bimanual-interaction of pen+touch are becoming more prevalent, consequently, research on pen+touch interaction methods has also become more and more important. Compared with the traditional WIMP interface that based on keyboard and mouse operation, the interactive mode of pen+touch are more intuitive and natural, and it can also broaden the input mode of human-computer interaction via the pen input channel. In the pen input channel category, pen-pressure is the most important one kind input mode, and this paper researches primarily the pressure input and pressure application in pen+touch interactive interface. The primary contents are as follows:First, to determine the limit width value of direct touch input with fingers in steering tasks, we design a trajectory-based tunnel-through experiments and investigate human performance with both the dominant-hand and non-dominant hand. Through analyzing on tunnel-through tasks the mean-time and error rate, we found that the limit tunnel-width of steering tasks are not less than 30 pixels when using fingers direct touch input.Second, we measure the pen-tip pressure data when using a pressure-pen in natural drawing and writing tasks, through arranging these data found that more than 95 percent of the pen-tip pressure are between 300 to 1500. Meanwhile, we measure the pen-tip pressure of resting force, and the measuring results shown pen-tip pressure has a significantly non-zero value. Based on the results above, we found that pen-tip pressure near or below the resting force is markedly more difficult to control and use. So, before the pressure-based interaction technology are designed and the pen-pressure of resting force must be considered fully.Third, in order to investigate human capabilities and limitations in controlling and maintaining pen-pressure tasks, we conduct a tunnel-through experiments that based on bimanual-interaction. In this experiments, the available pen-pressure were divided into 1 to 7 layers, and we analyze and compare the difference between the dominant hand and the non-dominant hand during trajectory tasks at different pressure levels. Through the experiments we found that up to 7 layers of pen-pressure can be controlled, but the error rate reached 64.5 percent when using the non-dominant hand performing circular tasks. Besides all, we also get some other important conclusions:the ability of the dominant hand manipulating pen-pressure is stronger than the non-dominant hand and pen-pressure manipulation tasks are more difficult than drawing trajectory, but the dominant hand need to spent more time than the non-dominant hand on pressure-based bimanual-interaction steering tasks.Fourth, based on the experimental results above, we discuss implications of pen+touch modals from two-hands, and propose one pen+touch combination interactive mode for the design of pressure-based interaction technology in pen+touch interfaces. At last, we present three pressure-based interaction techniques and design a image editing application to justify several of them.This dissertation is basic study on pen+touch interaction techniques, which has obvious significance for the design of pressure-based interaction techniques in pen+touch interactive interface.