Optical touch sensing device and touch signal determination method thereof
First Claim
1. An optical touch sensing device, comprising:
- a light source module, disposed on a touch surface and providing a detecting light to the touch surface;
at least one image capturing element, capturing an optical touch data along the touch surface based on the detecting light; and
a processing unit, coupled to the at least one image capturing element to receive the optical touch data, recognizing the optical touch data according to a recognition threshold to obtain a plurality of touch signals and a plurality of touch coordinates and a plurality of covering parameters corresponding to the touch signals, wherein each covering parameter is positively related to a spatial occupation of the corresponding touch signal, and each touch signal is corresponding to one of the touch coordinates and one of the covering parameters,wherein the processing unit determines an object spacing between each two touch coordinates and selects a plurality of candidate touch signals from the touch signals according to the object spacing, wherein the object spacing between each two touch coordinates corresponding to the candidate touch signals is smaller than or equal to a palm spacing,wherein after the candidate touch signals have been selected, the processing unit obtains an area threshold by multiplying the second largest covering parameter of the candidate touch signals by a magnification value which is greater than 1 and is not greater than 1.5,wherein the processing unit determines whether the largest covering parameter of the candidate touch signal is greater than the area threshold, and ignores the candidate touch signal having the largest covering parameter when it is determined that the largest covering parameter is greater than the area threshold.
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Abstract
An optical touch sensing device and a touch signal determining method thereof are provided. The optical touch sensing device includes a light source module, at least one image capturing element and a processing unit. The light source module disposed on a touch surface provides a detecting light to the touch surface. The image capturing element captures an optical touch data along the touch surface based on the detecting light. The processing unit recognizes the optical touch data according to a recognition threshold to obtain multiple touch signals. When a object spacing between the touch signals is no bigger than a palm spacing, the processing unit compares the covering parameters corresponding to the touch signals to select a largest covering parameter among the covering parameters, and determines whether to ignore the touch signal corresponding to the largest covering parameter according to the largest covering parameter and an area threshold.
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Citations
11 Claims
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1. An optical touch sensing device, comprising:
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a light source module, disposed on a touch surface and providing a detecting light to the touch surface; at least one image capturing element, capturing an optical touch data along the touch surface based on the detecting light; and a processing unit, coupled to the at least one image capturing element to receive the optical touch data, recognizing the optical touch data according to a recognition threshold to obtain a plurality of touch signals and a plurality of touch coordinates and a plurality of covering parameters corresponding to the touch signals, wherein each covering parameter is positively related to a spatial occupation of the corresponding touch signal, and each touch signal is corresponding to one of the touch coordinates and one of the covering parameters, wherein the processing unit determines an object spacing between each two touch coordinates and selects a plurality of candidate touch signals from the touch signals according to the object spacing, wherein the object spacing between each two touch coordinates corresponding to the candidate touch signals is smaller than or equal to a palm spacing, wherein after the candidate touch signals have been selected, the processing unit obtains an area threshold by multiplying the second largest covering parameter of the candidate touch signals by a magnification value which is greater than 1 and is not greater than 1.5, wherein the processing unit determines whether the largest covering parameter of the candidate touch signal is greater than the area threshold, and ignores the candidate touch signal having the largest covering parameter when it is determined that the largest covering parameter is greater than the area threshold. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A touch signal determining method for an optical touch sensing device, comprising:
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receiving an optical touch data based on a detecting light on a touch surface through using at least one image capturing element; recognizing the optical touch data to obtain a plurality of touch signals and a plurality of touch coordinates and a plurality of covering parameters corresponding to the touch signals according to a recognition threshold, wherein each covering parameter is positively related to a spatial occupation of the corresponding touch signal, and each touch signal is corresponding to one of the touch coordinates and one of the covering parameters; determining an object spacing between each two touch coordinates; selecting a plurality of candidate touch signals from the touch signals according to the object spacing, wherein the object spacing between each two touch coordinates corresponding to the candidate touch signals is smaller than or equal to a palm spacing; after the candidate touch signals have been selected, obtaining an area threshold by multiplying the second largest covering parameter of the candidate touch signals by a magnification value which is greater than 1 and is not greater than 1.5; determining whether the largest covering parameter of the candidate touch signal is greater than the area threshold; and ignoring the candidate touch signal having the largest covering parameter when it is determined that the largest covering parameter is greater than the area threshold. - View Dependent Claims (8, 9, 10, 11)
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Specification