USING METADATA FOR DC OFFSET CORRECTION FOR AN AC-COUPLED VIDEO LINK
First Claim
1. A system for transmitting a video signal over a video link, the system comprising:
- a transmitter configured to;
compute a statistical characteristic for a group of pixels of the video signal acquired by a camera,provide to the receiver the video signal over the video link, andprovide to the receiver metadata indicative of the computed statistical characteristic; and
a receiver configured to;
compute the statistical characteristic for the group of pixels of the video signal received from the transmitter,obtain the statistical characteristic computed by the transmitter from the metadata provided by the transmitter,compute a value indicative of a difference between the statistical characteristic computed by the receiver and the statistical characteristic computed by the transmitter, andcorrect one or more values of the video signal received from the transmitter by generating, for each original value of the one or more values, a corrected value, wherein the corrected value is equal to the original value modified by a value that is based on the computed value indicative of the difference.
1 Assignment
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Accused Products
Abstract
Disclosed herein are systems and methods for performing DC offset correction of a video signal received over an AC-coupled video link. In one aspect, a transmitter is configured to compute, and provide to a receiver, metadata indicative of a statistical characteristic (e.g., an average or a sum of values) for a group of active pixels of a video signal acquired by a camera. The receiver is configured to compute an analogous statistical characteristic on the video signal received over an AC-coupled video link, and to perform DC offset correction by modifying one or more values of the received video signal based on a comparison of the statistical characteristic computed by the receiver and the one computed by the transmitter and indicated by the received metadata.
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Citations
20 Claims
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1. A system for transmitting a video signal over a video link, the system comprising:
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a transmitter configured to; compute a statistical characteristic for a group of pixels of the video signal acquired by a camera, provide to the receiver the video signal over the video link, and provide to the receiver metadata indicative of the computed statistical characteristic; and a receiver configured to; compute the statistical characteristic for the group of pixels of the video signal received from the transmitter, obtain the statistical characteristic computed by the transmitter from the metadata provided by the transmitter, compute a value indicative of a difference between the statistical characteristic computed by the receiver and the statistical characteristic computed by the transmitter, and correct one or more values of the video signal received from the transmitter by generating, for each original value of the one or more values, a corrected value, wherein the corrected value is equal to the original value modified by a value that is based on the computed value indicative of the difference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A receiver for processing a video signal received over a video transmission line, the receiver comprising:
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means for obtaining a statistical characteristic computed by a transmitter using values of a group of pixels of the video signal before the video signal was transmitted to the receiver; means for computing the statistical characteristic for the group of pixels of the video signal using values of the group of pixels after the video signal has been transmitted over the video transmission line; compute a value indicative of a difference between the statistical characteristic computed using the values of the group of pixels before the video signal was transmitted to the receiver and the statistical characteristic computed using the values of the group of pixels after the video signal has been transmitted over the video transmission line; and means for correcting one or more values of the video signal after the video signal has been transmitted over the video transmission line by generating, for each original value of the one or more values, a corrected value, wherein the corrected value is based on the original value shifted by the computed value indicative of the difference. - View Dependent Claims (14, 15, 16, 17)
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18. A method of operating an analog video transmission system, the method comprising:
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computing a statistical characteristic for a first group of values, the first group of values including values of a group of pixels of a video signal before the video signal has been transmitted over a video link; computing the statistical characteristic for a second group of values, the second group of values including values of the group of pixels of the video signal after the video signal has been transmitted over the video link; compute a value indicative of a difference between the statistical characteristic computed for the first group of values and the statistical characteristic computed for the second group of values; and correcting one or more pixel values of the video signal that has been transmitted over the video link by generating, for each of the one or more pixel values, a corrected value, wherein the corrected value is based on the each of the one or more pixel values changed by the computed value indicative of the difference. - View Dependent Claims (19, 20)
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Specification