A method for operating a switch actuating device, the switch actuating device including a gesture sensor having four pixels, each of the four pixels including a thin film being made of a pyroelectric sensitive material, and the four pixels being arranged in respective corners of a convex tetragon relative to one another such that eight types of non-tactile gestures are detectable, the gesture sensor being configured to detect, by each of the thin films of the four pixels, heat emitted by an object when the object performs any one of eight types of non-tactile gestures, and to output a signal per pixel, the signals having signal deflections corresponding to a temporal intensity curve of the heat detected by the thin films of the corresponding pixels, a signal processing unit configured to determine performance of any one of the eight types of the non-tactile gestures based on a temporal succession of the signal deflections resulting from temporal delays of the signal deflections relative to one another, an actuator controlled by the signal processing unit and configured to actuate a switch when the performance of one of the eight types of the non-tactile gestures is determined, the eight types of the non-tactile gestures being defined by an approach phase during which the object approaches the gesture sensor, a subsequent waiting phase during which the object remains close to the gesture sensor, and a subsequent translational phase during which the object moves in one of eight directions, first four of the eight directions being a longitudinal direction, a direction opposite to the longitudinal direction, a transverse direction at a right angle to the longitudinal direction, and a direction opposite to the transverse direction, second four directions of the eight directions being directions respectively rotated by 45° relative to corresponding ones of the first four of the eight directions;
- and one diagonal of the convex tetragon being substantially parallel to the longitudinal direction and another diagonal of the convex tetragon being substantially parallel to the transverse direction, the method comprising the steps of:
- (a) outputting signal deflections generated during the approach phase and signal deflections generated during the translational phase from the four pixels to the signal processing unit when the non-tactile gesture are performed with the object emitting heat, a waiting level of the signal being reached between the signal deflections during the subsequent waiting phase, the waiting level having a first absolute value, extreme values of the signal deflections having second absolute values, and the first absolute value being lower than the second absolute values;
- (b) monitoring the signal and identifying an occurrence of a succession of the signal deflections and the waiting level which is arranged temporally between the signal deflections of the signal, and when the succession has been identified, proceeding to step (c);
- (c) determining if the signal deflections generated during the approach phase have directions opposite to directions of the signal deflections generated during the translational phase, and if the signal deflections generated during the approach phase have directions opposite to directions of the signal deflections generated during the translational phase, proceeding to step (d);
- (d) determining if a time offset of the signal deflections generated during the approach phase is within a first predetermined period of time, and if the time offset of the signal deflections generated during the approach phase is within the first predetermined period of time, proceeding to step (e);
- (e) determining if a time offset of a first temporal signal deflection and a last temporal signal deflection generated during the translational phase is within two threshold values and a lower threshold value of the two threshold values is greater than zero;
- and if the time offset of the first temporal signal deflection and the last temporal signal deflection generated during the translational phase is within the two threshold values and the lower threshold value of the two threshold values is greater than zero, proceeding to step (f);
- (f) identifying one of the eight types of the non-tactile gestures based on the temporal succession of the signal deflections generated during the translational phase;
- and
- (g) controlling the actuator to actuate the switch by the signal processor in accordance with the identified one of the eight types of the non-tactile gestures.