Apparatus and method for tracking handwriting from visual input
June 15, 2015. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesWrite and edit circuitry for electronic marking of displayed TV signal images Handwritten keyboardless entry computer system Segmentation of handwriting and machine printed text Method and apparatus for capturing information in drawing or writing Handwritten keyboardless entry computer system Diffusion-assisted position location particularly for visual pen detection Method and apparatus for automatically tracking an object Handwritten digit normalization method Method of recognizing handwritten symbols Character recognition method employing non-character recognizer InventorsAssigneeApplicationNo. 490678 filed on 06/15/1995US Classes:382/103, Target tracking or detecting345/179, Stylus382/186, Unconstrained handwriting (e.g., cursive)382/313Hand-heldExaminersPrimary: Bella, Matthew C.Attorney, Agent or FirmInternational ClassG06K 009/00AbstractA system for detecting movement of a writing implement relative to a writing surface to determine the path of the writing implement. The writing implement tip is determined within the image and used to form a kernel. The determination is made either manually, by looking for a predetermined pen tip shape, or by looking for a position of maximum motion in the image. That kernel is tracked from frame to frame to define the path of the writing implement. The tracking is accomplished by correlating the kernel to the image: either to the whole image, to a portion of the image near the last position of the kernel, or to a portion of the image predicted by a prediction filter.Field of SearchHand-heldSensing mechanism in stylus Sensing mechanism in platen Unconstrained handwriting (e.g., cursive) On-line recognition of handwritten characters Writing on ordinary surface (i.e., electronics are in pen) With a display APPLICATIONS Target tracking or detecting Using a signature Stylus DISPLAY PERIPHERAL INTERFACE INPUT DEVICE | |
