Enhanced contrast for object detection and characterization by optical imaging
First Claim
Patent Images
1. A method for analyzing captured images, the method comprising:
- capturing a first plurality of digital images of a field of view using a camera and at least one light source to illuminate the field of view at one or more illumination powers, the capturing of the first plurality of digital images including;
capturing a first digital image when the at least one light source is at a first illumination power;
capturing a second digital image when the at least one light source is at a second illumination power; and
capturing a third digital image when the at least one light source is at the first illumination power;
identifying pixels of the first plurality of digital images that correspond to an object rather than to a background, wherein the pixels corresponding to the object are identified based on a difference between the second digital image and the first digital image and a difference between the second digital image and the third digital image; and
wherein the identifying of the pixels of the first plurality of digital images further comprises;
forming a first difference image based upon the difference between the second digital image and the first digital image;
forming a second difference image based upon the difference between the second digital image and the third digital image; and
determining a third difference image, wherein each pixel of the third difference image comprises a pixel of a smaller pixel value between a corresponding pixel in the first difference image and a corresponding pixel in the second difference image and constructing a model of the object based on the identified pixels, the model including a position and a shape of the object.
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Abstract
Enhanced contrast between an object of interest and background surfaces visible in an image is provided using controlled lighting directed at the object. Exploiting the falloff of light intensity with distance, a light source (or multiple light sources), such as an infrared light source, can be positioned near one or more cameras to shine light onto the object while the camera(s) capture images. The captured images can be analyzed to distinguish object pixels from background pixels.
319 Citations
20 Claims
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1. A method for analyzing captured images, the method comprising:
- capturing a first plurality of digital images of a field of view using a camera and at least one light source to illuminate the field of view at one or more illumination powers, the capturing of the first plurality of digital images including;
capturing a first digital image when the at least one light source is at a first illumination power;
capturing a second digital image when the at least one light source is at a second illumination power; and
capturing a third digital image when the at least one light source is at the first illumination power;
identifying pixels of the first plurality of digital images that correspond to an object rather than to a background, wherein the pixels corresponding to the object are identified based on a difference between the second digital image and the first digital image and a difference between the second digital image and the third digital image; and
wherein the identifying of the pixels of the first plurality of digital images further comprises;
forming a first difference image based upon the difference between the second digital image and the first digital image;
forming a second difference image based upon the difference between the second digital image and the third digital image; and
determining a third difference image, wherein each pixel of the third difference image comprises a pixel of a smaller pixel value between a corresponding pixel in the first difference image and a corresponding pixel in the second difference image and constructing a model of the object based on the identified pixels, the model including a position and a shape of the object. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- capturing a first plurality of digital images of a field of view using a camera and at least one light source to illuminate the field of view at one or more illumination powers, the capturing of the first plurality of digital images including;
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17. A wearable goggle, comprising:
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at least one camera oriented toward a field of view; at least one light source disposed on a same side of the field of view as the at least one camera and oriented to illuminate the field of view; and a processor coupled to the at least one camera and the at least one light source and configured to; capture a first plurality of digital images of the field of view using the at least one camera and the at least one light source to illuminate the field of view at one or more illumination powers, the capturing of the first plurality of digital images including; capturing a first digital image when the at least one light source is at a first illumination power; capturing a second digital image when the at least one light source is at a second illumination power; and capturing a third digital image when the at least one light source is at the first illumination power; identify pixels of the first plurality of digital images that correspond to an object rather than to a background, wherein the pixels corresponding to the object are identified based on a difference between the second digital image and the first digital image and a difference between the second digital image and the third digital image; construct a model of the object based on the identified pixels, the model including a position and a shape of the object; capture a second plurality of digital images; identify pixels of the second plurality of digital images that correspond to the object rather than to the background; detect a motion of the object based at least in part upon the identified pixels of the first plurality of digital images and the identified pixels of the second plurality of digital images; and interpret the detected motion as gestures indicating user interaction with a virtual or augmented environment. - View Dependent Claims (18)
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19. A computer system comprising:
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at least one camera oriented toward a field of view; at least one light source disposed on a same side of the field of view as the at least one camera and oriented to illuminate the field of view; and a processor coupled to the at least one camera and the at least one light source and configured to; capture a first plurality of digital images of the field of view using the at least one camera and the at least one light source to illuminate the field of view at one or more illumination powers, the capturing of the firs plurality of digital images including; capturing a first digital image when the at least one light source is at a first illumination power; capturing a second digital image when the at least one light source is at a second illumination power; and capturing a third digital image when the at least one light source is at the first illumination power; identify pixels of the first plurality of digital images that correspond to an object rather than to a background, wherein the pixels corresponding to the object are identified based on a difference between the second digital image and the first digital image and a difference between the second digital image and the third digital image; construct a model of the object based on the identified pixels, the model including a position and a shape of the object; capture a second plurality of digital images; identify pixels of the second plurality of digital images that correspond to the object rather than to the background; detect a motion of the object based at least in part upon the identified pixels of the first plurality of digital images and the identified pixels of the second plurality of digital images; and use the detected motion a user input to the computer system.
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20. A tablet computer system comprising:
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at least one camera having a field of view and oriented toward a front surface so as to capture a motion of a user; at least one light source disposed on a same side of the field of view as the at least one camera and oriented to illuminate the field of view; and a processor coupled to the at least one camera and the at least one light source and configured to; capture a first plurality of digital images of the field of view using the at least one camera and the at least one light source to illuminate the field of view at one or more illumination powers, the capturing of the first plurality of digital images including; capturing a first digital image when the at least one light source is at a first illumination power; capturing a second digital image when the at least one light source is at a second illumination power; and capturing a third digital image when the at least one light source is at the first illumination power; identify pixels of the first plurality of digital images that correspond to an object rather than to a background, wherein the pixels corresponding to the object are identified based on a difference between the second digital image and the first digital and a difference between the second digital image and third digital image; construct a model of the object based on the identified pixels, the model including a position and a shape of the object; capture a second plurality of images; identify pixels of the second plurality of digital images that correspond to the object rather than to the background; detect a motion of the object based at least in part upon the identified pixels of the first plurality of digital images and the identified pixels of the second plurality of digital images; and use the detected motion as a user input to the tablet computer system.
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Specification