System and method for detection of transitions in an image stream of the gastrointestinal tract
First Claim
1. A computer-implemented method for detecting a transition in a stream of in-vivo images of a gastrointestinal (GI) tract, the method comprising:
- receiving an in-vivo image stream from an in vivo imaging device;
selecting a subset of images from the image stream for analysis;
calculating a segment score for each selected image, the segment score indicating in which anatomic segment of the GI tract the image was captured;
applying a smoothing function on the segment scores of the selected images to obtain a smoothed segment score signal;
detecting a global step in the smoothed segment score signal, said global step indicating a substantial change in a parameter calculated based on the segment score signal values;
detecting a local step in the smoothed segment score signal, said local step indicating a substantial change in a parameter calculated based on segment score signal values of a predetermined interval of the selected images from the image stream;
combining the local step and the global step to obtain a combined step; and
determining a point of transition in the image stream from one anatomical segment to another, the point of transition correlating to the combined step.
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Abstract
A system and method for detecting a transition in a stream of images of a gastrointestinal (GI) tract may include selecting images from an in-vivo image stream; calculating a segment score for each selected image indicating in which segment of the GI tract the image was captured; applying a smoothing function on the scores; detecting a global step in the smoothed segment score signal indicating a substantial change in a parameter calculated based on segment score signal values of the segment score signal values; detecting a local step indicating a substantial change in a parameter calculated based on segment score signal values of a predetermined interval of the of the segment score signal values; combining the local step and the global step; and determining a point of transition in the stream from one anatomical segment to another, the point of transition correlating to the combined step.
238 Citations
20 Claims
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1. A computer-implemented method for detecting a transition in a stream of in-vivo images of a gastrointestinal (GI) tract, the method comprising:
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receiving an in-vivo image stream from an in vivo imaging device; selecting a subset of images from the image stream for analysis; calculating a segment score for each selected image, the segment score indicating in which anatomic segment of the GI tract the image was captured; applying a smoothing function on the segment scores of the selected images to obtain a smoothed segment score signal; detecting a global step in the smoothed segment score signal, said global step indicating a substantial change in a parameter calculated based on the segment score signal values; detecting a local step in the smoothed segment score signal, said local step indicating a substantial change in a parameter calculated based on segment score signal values of a predetermined interval of the selected images from the image stream; combining the local step and the global step to obtain a combined step; and determining a point of transition in the image stream from one anatomical segment to another, the point of transition correlating to the combined step. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for detecting a transition in a stream of in-vivo images of a gastrointestinal (GI) tract, the system comprising:
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a storage unit to store an in-vivo image stream received from an in vivo imaging device; a processor to; select a subset of images from the image stream for analysis; calculate a segment score for each selected image, the segment score indicating in which anatomic segment of the GI tract the image was captured; apply a smoothing function to the segment scores of the selected images to obtain a smoothed segment score signal; detect a global step in the smoothed segment score signal, said global step indicating an abrupt change in a parameter calculated based on the segment score signal values; detect a local step in the smoothed segment score signal, said local step indicating an abrupt change in a parameter calculated based on segment score signal values of a predetermined interval of the selected images from the image stream; combine the local step and the global step to obtain a combined step; and determine a transition in the image stream from one anatomical segment to another, the point of transition correlating to the combined step. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for detecting a transition in a stream of in-vivo images of a gastrointestinal (GI) tract, the method comprising:
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selecting images from an in-vivo image stream; calculating a rating for each selected image, the rating indicating a probability that the image was captured in a predetermined anatomic segment of the GI tract; applying a smoothing function on the ratings of the selected images to obtain a rating function; detecting a global increment in the smoothed segment score signal indicating a maximal change in a parameter calculated based on the segment score signal values; detecting a local increment in the smoothed segment score signal indicating a maximal change in a parameter calculated based on a predetermined window of the of the segment score signal values; determining a point of transition in the image stream from one anatomical segment based on a combination of the local increment and the global increment. - View Dependent Claims (19, 20)
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Specification