Bottom-up watershed dataflow method and region-specific segmentation based on historic data to identify patches on a touch sensor panel
First Claim
1. A method for identifying touch patches on a touch sensor panel, comprising:
- measuring touch values of touch pixels on the touch sensor panel;
identifying a touch pixel having a largest touch value as representing a peak;
associating a plurality of touch pixels in an area surrounding the peak with a patch of touch pixels including the peak; and
selectively merging two or more non-overlapping patches of touch pixels into a single patch of touch pixels utilizing predetermined merging criteria upon determining that a number of touch pixels in at least one of the two or more touch patches is greater than a predetermined threshold.
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Abstract
The application of a watershed algorithm to pixels and their touch values obtained from a scan of a touch sensor panel to determine patches corresponding to images of touch is disclosed. Prior to applying the watershed algorithm, background pixels having little or no touch values can be eliminated. A primary merge algorithm can then merge adjacent patches together when the saddle point between them is shallow as compared to the peak represented by the patches. However, if two candidate patches for merging have a total number of pixels below a certain threshold, these two patches may not be merged under the assumption that the patches might have been caused by different fingertips. Conversely, if two candidate patches for merging have a total number of pixels above a certain threshold, these two patches can be merged under the assumption that the patches were caused by a single thumb or palm.
28 Citations
22 Claims
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1. A method for identifying touch patches on a touch sensor panel, comprising:
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measuring touch values of touch pixels on the touch sensor panel; identifying a touch pixel having a largest touch value as representing a peak; associating a plurality of touch pixels in an area surrounding the peak with a patch of touch pixels including the peak; and selectively merging two or more non-overlapping patches of touch pixels into a single patch of touch pixels utilizing predetermined merging criteria upon determining that a number of touch pixels in at least one of the two or more touch patches is greater than a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A non-transitory computer-readable storage medium storing program code for identifying touch patches on a touch sensor panel, the program code for causing performance of a method comprising:
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identifying a touch pixel on the touch sensor panel having a largest touch value as representing a peak; determining a patch of touch pixels for the peak by associating a plurality of touch pixels in an area surrounding the peak with the patch of touch pixels; and selectively merging two or more non-overlapping patches of touch pixels into a single patch of touch pixels utilizing predetermined merging criteria upon determining that a number of touch pixels in at least one of the two or more touch patches is greater than a predetermined threshold. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A touch-sensitive device, comprising:
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a touch sensor panel including a plurality of touch pixels; and a panel processor for identifying touch patches on a touch sensor panel, the panel processor programmed for receiving touch values obtained from the touch pixels, identifying a touch pixel having a largest touch value as representing a peak, associating a plurality of touch pixels in an area surrounding the peak with a patch of touch pixels including the peak, and selectively merging two or more non-overlapping patches of touch pixels into a single patch of touch pixels utilizing predetermined merging criteria upon determining that a number of touch pixels in at least one of the two or more touch patches is greater than a predetermined threshold. - View Dependent Claims (19, 20, 21, 22)
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Specification