Using metadata for DC offset correction for an AC-coupled video link

A receiver for processing a video signal received over a video transmission line, the receiver comprising:

• a circuit configured to obtain 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;
• a circuit configured to compute 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;
• a circuit configured to 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
• a circuit configured to correct 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.

A method of operating an analog video transmission system, the method comprising:

• 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;
• computing 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.