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    OBJECT DETECTION IN TOUCH SYSTEMS
    3.
    发明公开
    OBJECT DETECTION IN TOUCH SYSTEMS 审中-公开
    物体识别触摸系统

    公开(公告)号：EP2845080A4

    公开(公告)日：2015-12-16

    申请号：EP13784425

    申请日：2013-04-29

    Applicant: FLATFROG LAB AB

    Inventor： CHRISTIANSSON TOMAS ,  OHLSSON NICKLAS ,  BJÖRKLUND ANDREAS ,  WALLANDER MATS PETTER

    IPC: G06F3/042 ,  G06F3/041

    CPC classification number: G06F3/041 ,  G06F3/0416 ,  G06F3/0421 ,  G06F2203/04104 ,  G06F2203/04109

    Abstract: A signal processor implements a technique for detecting objects on a panel which transmits signals inside the panel such that the objects are allowed to interact with (e.g. attenuate) the signals by contact with a touch surface of the panel. The signal processor operates to define cells that have a given location on the touch surface and are associated with a respective set of intersecting paths for the signals across the touch surface. The signal processor operates to obtain (70) an output signal from a signal detection arrangement that measures a signal property for each path; process (71) the output signal to obtain an interaction value for each path; and determine (73-75) a touch status of a selected cell among the cells by analyzing the distribution of interaction values for at least part of the intersecting paths. The touch status indicates presence or absence of one of the objects in the selected cell.

    IMPROVED MULTI-TOUCH DETECTION IN A TOUCH SYSTEM
    5.
    发明公开
    IMPROVED MULTI-TOUCH DETECTION IN A TOUCH SYSTEM 有权
    改进的多触摸优先的触摸系统

    公开(公告)号：EP2766797A4

    公开(公告)日：2015-04-29

    申请号：EP12839672

    申请日：2012-10-08

    Applicant: FLATFROG LAB AB

    Inventor： CHRISTIANSSON TOMAS ,  WALLANDER MATS PETTER ,  JUHLIN PETER ,  JOHANSSON ANDREAS ,  WALL HENRIK ,  OHLSSON NICKLAS

    IPC: G06F3/042 ,  G06F3/041

    CPC classification number: G06F3/041 ,  G06F3/0418 ,  G06F3/0421 ,  G06F2203/04104 ,  G06F2203/04109

    Abstract: Multi-touch sensitivity is enabled using a touch system that comprises a panel configured to conduct signals, e.g. by FTIR, from a plurality of incoupling points to a plurality of outcoupling points, thereby defining detection lines across the panel between pairs of incoupling and outcoupling points. A signal processor operates in a repeating sequence of iterations to obtain (50) a current signal value for each detection line, and generate (53, 53′) a first interaction pattern and a second interaction pattern as a function of the current signal values, such that the first and second interaction patterns are reconstructed two-dimensional distributions of local interaction with the conducted signals across the surface portion, and represent changes in interaction on different time scales. Thereby, the movement of an object will affect how it is represented in each of the first and second interaction patterns.

    DETECTION OF SURFACE CONTAMINATION
    9.
    发明公开
    DETECTION OF SURFACE CONTAMINATION 审中-公开

    公开(公告)号：EP3161594A4

    公开(公告)日：2018-01-17

    申请号：EP15812234

    申请日：2015-06-22

    Applicant: FLATFROG LAB AB

    Inventor： OHLSSON NICKLAS ,  CHRISTIANSSON TOMAS

    IPC: G06F3/042

    CPC classification number: G01N21/958 ,  G01N21/59 ,  G01N21/94 ,  G01N2021/945 ,  G01N2201/124 ,  G06F3/0418 ,  G06F3/0421 ,  G06F2203/04109

    Abstract: A device implements a method for detecting contamination of an FTIR-based panel. The apparatus generates projection signals representing detection lines that have propagated on a plurality of propagation paths by total internal reflection (TIR) inside a transmissive panel such that contamination on the panel surface causes attenuation (frustration) of at least one of the projection signals. The device generates a transmission value for each detection line in the transmissive panel, and determines the presence of contamination on the surface of the panel by comparing the transmission values according to at least one of the presented comparison techniques.

    EFFICIENT TOMOGRAPHIC PROCESSING FOR TOUCH DETERMINATION
    10.
    发明公开
    EFFICIENT TOMOGRAPHIC PROCESSING FOR TOUCH DETERMINATION 审中-公开
    有效的静脉造影处理触摸确定

    公开(公告)号：EP2823388A4

    公开(公告)日：2015-10-21

    申请号：EP13757307

    申请日：2013-03-07

    Applicant: FLATFROG LAB AB

    Inventor： CHRISTIANSSON TOMAS ,  BJÖRKLUND ANDREAS ,  OHLSSON NICKLAS

    IPC: G06F3/0488 ,  G06F3/042 ,  G06T3/40

    CPC classification number: G06F3/042 ,  G06F3/0416 ,  G06F3/0421 ,  G06F2203/04109 ,  H04M1/72563

    Abstract: Touch sensitivity is enabled using a touch system that comprises a panel configured to conduct signals, e.g. by TIR, along detection lines across a rectangular touch surface with first and second spatial dimensions. A signal processor operates to transform energy values for the detection lines into Fourier coefficients arranged as data points on a regular grid defined by first and second frequency dimensions. To generate an interaction pattern for the touch surface, the signal processor operates a first 1D inverse FFT on the data points with respect to the second frequency dimension, so as to generate first values transformed into the second spatial dimension, and operates a second 1D inverse FFT on a selected subset of the first values with respect to the first frequency dimension to generate second values that represent the interaction pattern. The selected subset is defined by the data points that fall within an extent of the touch surface in the second spatial dimension, thereby reducing the total number of inverse FFT operations.

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