Study On Interactive Performance Impacts To Touch Points Quantity In Multi-touch Technology

Multi-touch, a more natural and friendly human-computer interaction technology, which is quite different from the traditional touch way with one finger, is a technology for multi-finger, multi-hand and multi-user and can be able to support richer gestures. Thus, multi-touch provides users not only efficient interaction but also a more natural using experience. The Multi-touch technology develops so rapidly that the number of its supporting points has increased from 2 to 4, tens and even hundreds of points. The more points it supports, the more input channels there are and more input parameters it can provide. As a result, studies on Gesture become a hot spot and gesture designs completing various tasks emerge in large numbers. However, in this research, it has been found that the only use of more fingers could not help to design more complex and flexible gestures.This paper, which investigated the development and applications of multi-touch techniques, implemented a rapid toolkit for user interface development, which bases on the mainstream multi-touch framework. In the meanwhile, with the review of corresponding HCI techniques and the theories of single finger and multi-finger, the prototypes has been built both for single finger gestures with widget and multi-finger gestures to manipulate the picture.In order to address the problems of moving, scaling and rotating efficiency, this paper discussed the accuracy while manipulating with single finger and multi-finger. The experiments proved that single finger manipulation gets higher accuracy in tasks about moving and scaling, while multi-finger manipulation prefers higher rotating efficiency. Moreover, our experiments ensure that the accuracy values in moving, scaling and rotating tasks are 2 pixels (0.06cm),2 pixels (0.06cm) and 1 degree respectively. Then this paper designs Gestures corresponding to accomplish the Image Alignment task by using different number of fingers (one finger or two fingers). The experiment shows that Gesture using relatively fewer fingers (one finger) through the cooperation of the well-designed widget has better (at least not worse) performance than that using relatively more fingers (two fingers). Finally, the conclusion can be made as:fingers should be appropriately increased (but not be excessive used of) according to the complexity of the task while designing the gesture. Thus, a well-designed widget should be used to assist the Gestures in order to minimize the reliance on the need for more fingers as little as possible. To some extent, this conclusion can play a role in guiding the design of Gestures in multi-touch technology.