发明名称 Touch determination by tomographic reconstruction
摘要 A touch-sensitive apparatus comprises a panel configured to conduct signals from a plurality of peripheral incoupling points to a plurality of peripheral outcoupling points. Actual detection lines are defined between pairs of incoupling and outcoupling points to extend across a surface portion of the panel. The signals may be in the form of light, and objects touching the surface portion may affect the light via frustrated total internal reflection (FTIR). A signal generator is coupled to the incoupling points to generate the signals, and a signal detector is coupled to the outcoupling points to generate an output signal. A data processor operates on the output signal to enable identification of touching objects. The output signal is processed (40) to generate a set of data samples, which are indicative of detected energy for at least a subset of the actual detection lines. The set of data samples is processed (42) to generate a set of matched samples, which are indicative of estimated detected energy for fictitious detection lines that have a location on the surface portion that matches a standard geometry for tomographic reconstruction. The set of matched samples is processed (44, 46) by tomographic reconstruction to generate data indicative of a distribution of an energy-related parameter within at least part of the surface portion.
申请公布号 US8780066(B2) 申请公布日期 2014.07.15
申请号 US201113695505 申请日期 2011.04.28
申请人 Flatfrog Laboratories AB 发明人 Christiansson Tomas;Juhlin Peter
分类号 G06F3/041;G06F3/042 主分类号 G06F3/041
代理机构 Harness, Dickey & Pierce, P.L.C. 代理人 Harness, Dickey & Pierce, P.L.C.
主权项 1. A method of enabling touch determination based on an output signal from a touch-sensitive apparatus, the touch-sensitive apparatus including a panel configured to conduct signals from a plurality of peripheral incoupling points to a plurality of peripheral outcoupling points, thereby defining actual detection lines that extend across a surface portion of the panel between pairs of incoupling and outcoupling points, at least one signal generator coupled to the plurality of peripheral incoupling points to generate the signals, and at least one signal detector coupled to the plurality of peripheral outcoupling points to generate the output signal, the method comprising: processing the output signal to generate a set of data samples in a two-dimensional sample space, wherein each data sample is representative of an actual detection line, and wherein the data samples are defined by a signal value indicative of detected energy for at least a subset of the actual detection lines and two dimensional values that define the location of the actual detection line on the surface portion; processing the set of data samples to generate a set of matched samples at locations in the two-dimensional sample space, each matched sample having an estimated signal value, wherein the matched samples are indicative of estimated detected energy for fictitious detection lines that have a location on the surface portion that matches a standard geometry for tomographic reconstruction, the processing the set of data samples including, calculating the estimated signal values according to a two-dimensional interpolation function and based on the signal values of the data samples; and processing the set of matched samples by tomographic reconstruction to generate data indicative of a distribution of an energy-related parameter within at least part of the surface portion.
地址 Lund SE