Method and device for detecting whether a video signal is frozen
AssigneeVSI Corporation
InventorCharles Jo
Life of this patent
Estimating the term…
Abstract
A device according to the present invention includes: a first detection unit for detecting the start of each video frame and the start of each video line within the video frame in a received video stream, a second detector configured to detect a bit at a target position specified for an arbitrary video frame of the video stream based on the start of each video frame and the start of each video line detected by the first detector, and a decision unit configured to decide that the video stream is frozen if one or more target codes obtained from one or more bits individually detected by the second detector do not correspond to a specific code specified for the arbitrary video frame.
Claims26
A device for transmitting an input video stream to other devices through a communication channel, the device comprising:
- a detector that detects the start of each video frame and the start of each video line within the video frame in the input video stream,
- an inserter configured such that based on the start of each video frame and the start of each video line detected by the detector, in at least one of N (N is two or more) video frames that are temporally contiguous in a video stream, a specific mark consisting of 1 bit or more is inserted by replacing a part of the pixel data of the video stream, and the CRC data added to a video line with respect to a video line into which the bit of the replaced or inserted specific mark is replaced with CRC data that matches the video line including the replaced or inserted bit.
A device for detecting frozen video in a video stream received through a communication channel, the device comprising:
- a first detector that detects the start of each video frame and the start of each video line within the video frame in a received video stream,
- a second detector configured to detect a bit at a target position specified for an arbitrary video frame of the video stream based on the start of each video frame and the start of each video line detected by the first detector, and
- a decision unit configured to decide that the video stream is frozen if one or more target codes obtained from one or more bits individually detected by the second detector do not correspond to a specific code specified for the arbitrary video frame.
A method for transmitting an input video stream to other devices through a communication channel, the method comprising:
- a first step of detecting the start of an arbitrary video line within an arbitrary video frame in an input video stream,
- a second step of replacing or inserting a bit of pixel data written at a position that is specified from the detected starting point of the arbitrary video line with 1 bit of a specific mark to be inserted into the arbitrary video frame, and
- a third step of replacing CRC data added to a video line with respect an arbitrary video line in which at least one bit is replace or inserted, by CRC data that matches the video line containing the replaced or inserted bit.
A method for detecting frozen video in a video stream received through a communication channel, the method comprising:
- a first step of detecting the start of an arbitrary video frame in a received video stream,
- a second step of detecting the start of each video line in the arbitrary video frame whose start has been detected, and detecting a bit at a target position that is specified for the arbitrary video frame based on the detected start of each video line, and
- a third step of obtaining one or more target codes from one or more bits individually detected in the second step, checking whether they correspond to a specific code specified for the arbitrary video frame, and determining that the video stream is frozen if they do not correspond to the specific code.
Dependencies are inferred from the claim text.