US Patent 8194926 Motion estimation for mobile device user interaction

One or more sensors of a mobile computing device may detect a current movement characteristic of the mobile computing device and a current orientation characteristic of the mobile computing device, the current movement characteristic and the current orientation characteristic being based at least in part on a path of motion of the mobile computing device. An estimated path of motion may be defined based on the current movement characteristic and the current orientation characteristic. One or more characters based at least in part on the estimated path of motion may be identified. A graphical representation of the one or more characters may be inserted into a text input field, the graphical representation of the one or more characters and the text input field being outputted at a display of the mobile computing device.