Method for superimposing pictures
AssigneeInfineon Technologies AG
InventorsMaik Brett, Matthias Burkert, Dirk Wendel
Life of this patent
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Abstract
In the case of picture insertions, such as picture-in-picture, for example, fluctuations in the line duration are manifested in position displacements relative to the desired position of the inserted pictures. In order to prevent position displacements in the horizontal direction, it is provided that the insertion position is corrected in a manner dependent on a determined line duration. The method according to the invention is suitable in particular for picture-in-picture insertions in television receivers.
Claims10
A method for inserting an inset picture (EB) into a main picture (HB) constructed from a plurality of lines, which is transmitted with a video signal (HVS) and in the case of which the construction of a new line of the main picture (HB) from pixels is begun when a start pulse (IP) is detected in the video signal (HVS), comprising:
- determining the time duration between two successive horizontal start pulses (IP) to determine an actual line duration of a line of the main picture, and
- after a specific number—dependent on the actual line duration determined and on a desired vertical position (WP) of the inset picture (EB) within the main picture (HB)—of pixels from the beginning of a line of the main picture (HB) that is provided for the insertion, a line of the inset picture (EB) is inserted within this provided line of the main picture (HB),
- wherein the specific number of pixels after which the insertion is effected is described by:
- b
- actual
- =
- b
- desired
- ·
- T
- actual
- T
- nom
- where the following holds true:
- Tactual is the actual line duration between the two successive horizontal start pulses,
- Tnom is a nominal line duration (NZD) of a complete line of the main picture (HB), and
- bdesired is the number of pixels from the beginning of a line of the main picture (HB) in the case of which the line of the inset picture (EB) would have to be inserted at the desired horizontal position (WP) in event of the time duration between the two successive horizontal start pulses being Tactual=Tnom.
A method for inserting an inset picture (EB) into a main picture (HB) constructed from a plurality of lines, which is transmitted with a video signal (HVS) and in the case of which the construction of a new line of the main picture (HB) from pixels is begun when a start pulse (IP) is detected in the video signal (HVS), comprising:
- determining the time duration between two successive horizontal start pulses (IP) to determine an actual line duration of a line of the main picture, and
- after a specific number—dependent on the actual line duration determined and on a desired vertical position (WP) of the inset picture (EB) within the main picture (HB)—of pixels from the beginning of a line of the main picture (HB) that is provided for the insertion, a line of the inset picture (EB) is inserted within this provided line of the main picture (HB),
- wherein the specific number of pixels (bactual) after which a first line of the inset picture (EB) is inserted within the provided line of the main picture (HB) is also used for at least one line following the first line if the deviation of the number of pixels which is calculated for the following line lies below a predetermined threshold.
Dependencies are inferred from the claim text.