Method and device for coding/decoding information for defining a window in a video image
OwnerChristine Masson, Gerard Bret +2inventors
InventorsChristine Masson, Gerard Bret, Frederic Tupin, Olivier Le Briz
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Abstract
For the coding of information for defining a determined window in a video image, a coding pulse is transmitted in a first of the R,G,B video signals sent to a cathode ray tube monitor. The coding pulse is transmitted within at least one time window associated with a determined frame line, and has a temporal width which corresponds to the width of the window in the video image.
Claims87
Method for coding information for defining a determined window (14) in a video image (13) to be displayed in a monitor having a cathode ray tube, comprising the step of transmitting a coding pulse in synchronism with a horizontal synchronization signal of said cathode ray tube, in a first one of R,G,B video signals sent to said monitor
- wherein said coding pulse is transmitted in at least one frame determined within at least one time window associated with a determined frame line, and
- wherein said coding pulse has a temporal width which corresponds to the width of said window in said video image.
Device for coding information for defining a determined window in a video image to be displayed in a monitor having a cathode ray tube, comprising means for transmitting, in a first one of R,G,B video signals sent to the monitor, and, in at least one frame determined within at least one time window associated with a determined frame line, a coding pulse synchronized with a horizontal synchronization signal of said cathode ray tube, said coding pulse having a temporal width which corresponds to the width of the said window in the said video image.
Method for decoding information for defining a determined window in a video image to be displayed in a monitor having a cathode ray tube, said information being coded in some at least of R,G,B video signals sent to the monitor, comprising the steps of
- receiving a coding pulse synchronized with a horizontal synchronization signal of the cathode ray tube in a first one of said R,V,B signals, said coding pulse being received in at least one determined frame within at least one time window associated with a determined frame line,
- counting time units onwards of the start of said frame line,
- storing a first horizontal count value on receipt of a start edge of the coding pulse, and
- storing a second horizontal count value on receipt of an end edge of the coding pulse,
- wherein said first horizontal count value and said second horizontal count value determine the left limit and the right limit respectively, of said window in said video image.
Device for decoding information for defining a determined window in a video image to be displayed in a monitor having a cathode ray tube, said information being coded in some at least of R,G,B video signals sent to the monitor, comprising:
- means for receiving in a first one of said R,V,B signals a coding pulse synchronized with a horizontal synchronization signal of the cathode ray tube, said coding pulse being received in at least one determined frame within at least one time window associated with a determined frame line,
- means for counting time units onwards of the start of said frame line,
- means for storing a first horizontal count value on receipt of a start edge of the coding pulse, and
- means for storing a second horizontal count value on receipt of an end edge of the coding pulse,
- wherein said first horizontal count value and said second horizontal count value determine the left limit and the right limit respectively of said window in said video image.
Video signal comprising R,G,B signals for coding a video image (13) to be displayed in a monitor having a cathode ray tube, and further comprising a horizontal synchronization signal of said cathode ray tube,
- wherein a first one of said R,G,B video signals comprises a coding pulse in synchronism with said synchronization signal, for coding information for defining a determined window (14) in said video image;
- wherein said coding pulse is present in at least one frame determined within at least one time window associated with a determined frame line, and
- wherein said coding pulse has a temporal width which corresponds to the width of said window in said video image.
74 The video signal of claim 69, wherein n2 is equal to 3, and wherein the identification code of the code words present in those of the second time windows which are associated respectively with the first one and with the third one of the lines of the second group has a first determined value whereas the code word present in that of the second time windows which is associated with the second one of the lines of the second group has a second determined value which is the logical complement of the said first determined value.
Dependencies are inferred from the claim text.