Passive touch system and method of detecting user input
First Claim
1. A method of determining the absolute position of an object relative to a rectangular frame surrounding a region of interest in the front of a display surface from images captured by at least two digital camera devices, each digital camera device being mounted adjacent a different corner of the frame, said method comprising:
- capturing images with the digital camera devices, each digital camera device having a field of view that (i) images at least a portion of the display surface, (ii) images at least a portion of the frame, and (iii) extends at least beyond an adjacent peripheral edge of said frame, said digital camera devices being oriented to capture overlapping images of said region of interest, at least one of the digital camera devices having a sensor comprising a plurality of pixels extending in at least one direction; and
processing pixel data of images received from each digital camera device using at least one processor to compensate for an angle between the field of view of each digital camera device and at least a portion of the peripheral edge of the frame and to determine the absolute position of the object relative to the frame.
6 Assignments
0 Petitions
Accused Products
Abstract
A method of tracking an object of interest preferably includes (i) acquiring a first image and a second image representing different viewpoints of the object of interest; (ii) processing the first image into a first image data set and the second image into a second image data set; (iii) processing the first image data set and the second image data set to generate a background data set associated with a background; (iv) generating a first difference map by determining differences between the first image data set and the background data set and a second difference map by determining differences between the second image data set and the background data set; (v) detecting a first relative position of the object of interest in the first difference map and a second relative position of the object of interest in the second difference map; and (vi) producing an absolute position of the object of interest from the first and second relative positions of the object of interest.
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Citations
12 Claims
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1. A method of determining the absolute position of an object relative to a rectangular frame surrounding a region of interest in the front of a display surface from images captured by at least two digital camera devices, each digital camera device being mounted adjacent a different corner of the frame, said method comprising:
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capturing images with the digital camera devices, each digital camera device having a field of view that (i) images at least a portion of the display surface, (ii) images at least a portion of the frame, and (iii) extends at least beyond an adjacent peripheral edge of said frame, said digital camera devices being oriented to capture overlapping images of said region of interest, at least one of the digital camera devices having a sensor comprising a plurality of pixels extending in at least one direction; and processing pixel data of images received from each digital camera device using at least one processor to compensate for an angle between the field of view of each digital camera device and at least a portion of the peripheral edge of the frame and to determine the absolute position of the object relative to the frame. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of determining the absolute position of an object relative to a rectangular frame surrounding a region of interest in the front of a display surface from images captured by at least two imaging assemblies, each imaging assembly being mounted adjacent a different corner of the frame, said method comprising:
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capturing images with the imaging assemblies, each imaging assembly being oriented so that the fields of view of the imaging assemblies overlap across the front of the display surface and so that the field of view of each imaging assembly extends at least beyond an adjacent peripheral edge of said frame, at least one of the imaging assemblies having a sensor comprising a plurality of pixels extending in at least one direction; and processing pixel data of images received from each imaging assembly using at least one processor to compensate for an angle between the field of view of each imaging assembly and at least a portion of the peripheral edge of the frame and to determine the absolute position of the object relative to the frame. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification