00000ctm a22000004a 4500 UP-99796217611426109 Buklod 20230215105418.0 m |o d | ta 141011s xx d r |||| u| (iLib)UPD-00234405631 DENGII rda eng DMLUC LG 995 2014 E64 T36 Tanyag, Riyeth P. author. Implicit palm rejection using hand occlusion behavior and touch characteristics for tablet devices Riyeth P. Tanyag. Quezon City College of Engineering, University of the Philippines Diliman 2014. v, 50 leaves illustrations 28 cm text rdacontent unmediated rdamedia volume rdacarrier Thesis (M.S. Electrical Engineering)--University of the Philippines, Diliman. Tablets have found a unique use as a digital alternative to traditional pen and paper for writing, drawing and note-taking. Unfortunately, touchscreen devices usually cannot distinguish between a legitimate finger or stylus touch from touches detected from the palm or the other parts of the hand and arm. Commonly called the "palm rejection problem", these unintended touches often cause erroneous application behavior and unsightly imprints on the display. Users are forced to orient their hands unnaturally therefore greatly reducing the quality of user experience. We developed an implicit palm rejection algorithm that takes advantage of hand occlusion behavior and touch features detected by the touchscreen display to determine the context of a tablet touch. The algorithm uses a model-based filtering method that uses two geometric hand models to define the palm rejection region to successfully respond to palm-first or write-first scenarios. Our qualitative tests show that our algorithm provides good comfort and accuracy, by obtaining a criteria rating value of 4.333 for comfort and 4.200 for accuracy. Our implementation can also correctly filter 99% of writing strokes with an errant touch rate of 0.87%. In summary, our palm rejection algorithm is shown to be comparable or better than the available software applications. Touch screens. Tablet computers Mobile applications. Palm rejection. Thesis FI UP UPD DARCHIVES LG 995 2014 E64 T36 UPD DENG-II LG 995 2014 E64 T36 Thesis