Abstract: A system (1) detects an object (100) approaching and touching a capacitive touch device (10). The system includes the capacitive touch device (10), a processor, an optical system connected to the processor and arranged to collect information on the object (100). The processor is arranged so as to classify the object (100) as a triggering object or as a non-triggering object based on this information. If the object is classified as a non-triggering object, the processor disables the execution of touch functions of the capacitive touch device (10) at the latest when at least a part of the object (100) touches the capacitive touch device (10). If the object is classified as a triggering object, at the latest when at least a part of the object touches the capacitive touch device (10), the processor executes a predetermined function on the capacitive touch device (10).

Abstract: A method for detecting an arbitrary number of touches from an input image of a multi-touch device comprising the following steps: processing said input image and obtaining a processed image; segmentation by thresholding of said processed image (8000) and obtaining a segmented image; identifying regions of the segmented image; finding local maxima, each local maximum being of size one pixel on a sub-region inside each region; determining at least one touch position based on said local maxima.

Abstract: A circuit for capacitive touch applications has a charge integrator, a low pass-filter, and a correlated double sampler having an input capacitor. The circuit also includes a sampler and holder, and an analog to digital converter. The low pass-filter has a cut-off frequency lower than the Nyquist frequency of the sampler and holder, and the low pass filter includes input capacitor and a serial resistor.

Abstract: A method for detecting an arbitrary number of touches from an input image of a multi-touch device comprising the following steps: processing said input image and obtaining a processed image; segmentation by thresholding of said processed image (8000) and obtaining a segmented image; identifying regions of the segmented image; finding local maxima, each local maximum being of size one pixel on a sub-region inside each region; determining at least one touch position based on said local maxima.

Abstract: A circuit for capacitive touch applications comprising a charge integrator a low pass-filter a correlated double sampler comprising an input capacitor a sampler and holder an analog to digital converter said low pass-filter having a cut-off frequency lower than the Nyquist frequency of the sampler and holder said low pass filter comprising said input capacitor and a serial resistor.