Method and system for video processing to determine digital pulse recognition tones
First Claim
1. A method for isolating a broadcast digital pulse recognition tone of a beacon light source in a digital video sequence, the method comprising:
- electronically receiving, by an image sensor of a mobile device, a digital video sequence of a scene, wherein the digital video sequence comprises a sequence of frames and the scene comprises both modulated illumination broadcast by a beacon light source and un-modulated illumination;
calculating a background value of the digital video sequence, wherein the background value comprises a portion of the digital video sequence corresponding to the un-modulated illumination of the scene;
subtracting the background value of the digital video sequence from the digital video sequence to obtain an isolated digital video sequence of the modulated illumination of the scene;
calculating a frequency content of a frame of the isolated digital video sequence; and
determining a particular symbol broadcast by the beacon light source based on the frequency content;
wherein each frame of the sequence of frames comprises a plurality of pixel values, each of the plurality of pixel values having a given point in the frame, and calculating the background value comprises analyzing the plurality of pixel values of each given point of a subset of the sequence of frames.
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Abstract
In one aspect, the present disclosure relates to a method for isolating a broadcast digital pulse recognition tone of a beacon light source in a digital video sequence. In some embodiments, the method includes receiving a digital video sequence of a scene, the digital video sequence including a sequence of frames and the scene including both modulated illumination broadcast by a beacon light source and un-modulated illumination, calculating a background value of the digital video sequence, the background value including a portion of the digital video sequence corresponding to the un-modulated illumination of the scene, subtracting the background value of the digital video sequence to obtain an isolated digital video sequence of the modulated illumination of the scene, calculating a frequency content of a frame of the isolated digital video sequence, and determining a particular tone broadcast by the beacon light source based on the frequency content.
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Citations
12 Claims
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1. A method for isolating a broadcast digital pulse recognition tone of a beacon light source in a digital video sequence, the method comprising:
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electronically receiving, by an image sensor of a mobile device, a digital video sequence of a scene, wherein the digital video sequence comprises a sequence of frames and the scene comprises both modulated illumination broadcast by a beacon light source and un-modulated illumination; calculating a background value of the digital video sequence, wherein the background value comprises a portion of the digital video sequence corresponding to the un-modulated illumination of the scene; subtracting the background value of the digital video sequence from the digital video sequence to obtain an isolated digital video sequence of the modulated illumination of the scene; calculating a frequency content of a frame of the isolated digital video sequence; and determining a particular symbol broadcast by the beacon light source based on the frequency content;
wherein each frame of the sequence of frames comprises a plurality of pixel values, each of the plurality of pixel values having a given point in the frame, and calculating the background value comprises analyzing the plurality of pixel values of each given point of a subset of the sequence of frames. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An image detection apparatus for isolating a broadcast digital pulse recognition tone of a beacon light source in a digital video sequence comprising:
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an imaging sensor; and a processor in communication with the imaging sensor configured to receive a digital video sequence comprising a sequence of frames of a scene comprising both modulated illumination broadcast by the beacon light source and un-modulated illumination, calculate a background value comprising a portion of the digital video sequence corresponding to the un-modulated illumination of the scene of the digital video sequence, subtract the background value of the digital video sequence from the digital video sequence to obtain an isolated digital video sequence of the modulated illumination of the scene, calculate a frequency content of a frame of the isolated digital video sequence, and determine a particular symbol broadcast by the beacon light source based on the frequency content;
wherein each frame of the sequence of frames comprises a plurality of pixel values, each of the plurality of pixel values having a given point in the frame and the processor is configured to calculate the background value by analyzing the plurality of pixel values of each given point of a subset of the sequence of frames. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification