Rendering images containing video

A method of creating a video node, said video node being created according to a compositing tree, said compositing tree comprising a plurality of nodes each representing a graphical primitive or an operation for combining said graphical primitives, said method comprising the steps of:

• representing at least one video frame of a video sequence by a first image node;
• representing at least one video frame of the video sequence by a second image node;
• compositing the video frame represented by the first image node with a corresponding path graphical primitive for extracting a predetermined shape of an image, represented by a first primitive node of said compositing tree, according to at least one of an in compositing operation and an out compositing operation represented by a first composite node of said compositing tree, in order to generate a first composite image;
• compositing the video frame represented by the second image node with a further corresponding path graphical primitive represented by a second primitive node of said compositing tree, according to the at least one compositing operation represented by a second composite node of said compositing tree, in order to generate a second composite image;
• compositing the first and second composite images represented by the first and second composite nodes together, according to at least one of a plus compositing operation and an over compositing operation represented by said video node, in order to create said video node representing the video frames, wherein one or more attributes of said video frames are changeable by changing an attribute of said video node;
• and
• displaying one or more of the video frames on a display device using said video node.

An apparatus for rendering an image, said image being formed by compositing one or more graphical primitives according to a compositing tree, said compositing tree comprising a plurality of nodes each representing a graphical primitive of said image or an operation for combining said graphical primitives, said apparatus comprising:

• representation means for representing at least one video frame of a video sequence by a first image node and representing at least one video frame of a second video sequence by a second image node;
• first compositing means for compositing the video frame represented by the first node with a corresponding path graphical primitive for extracting a predetermined shape of an image, represented by a primitive node of said compositing tree, according to at least one of an in compositing operation and an out compositing operation represented by a first composite node of said compositing tree, in order to generate a second composite image;
• second compositing means for compositing the video frame represented by the second image node with a further path graphical primitive represented by a second primitive node of said compositing tree, according to the at least one compositing operation represented by a second composite node of said compositing tree, in order to generate a second composite image;
• third compositing means for compositing the first and second composite images represented by the first and second composite nodes together, according to at least one of a plus compositing operation and an over compositing operation represented by a third composite node of said compositing tree, in order to render said image, wherein one or more attributes of said video frames are changeable by changing an attribute of the third composite node;
• and
• displaying means for displaying said image on a display device.

An apparatus for creating a video node, said video node being created according to a compositing tree, said compositing tree comprising a plurality of nodes each representing a graphical primitive or an operation for combining said graphical primitives, said apparatus comprising:

• representation means for representing at least one video frame of a video sequence by a first image node and representing at least one video frame of the video sequence by a second image node;
• first compositing means for compositing the video frame represented by the first image node with a corresponding path graphical primitive for extending a predetermined shape of an image, represented by a first primitive node of said compositing tree, according to at least one of an in compositing operation and an out compositing operation each represented by a first composite node of said compositing tree, in order to generate a first composite image;
• second compositing means for compositing the video frame represented by the second image node with a further path graphical primitive represented by a second primitive node of said compositing tree, according to the at least one compositing operation represented by a second composite node of said compositing tree, in order to generate a second composite image;
• third compositing means for compositing the first and second composite images represented by the first and second composite node together, according to at least one of a plus compositing operation and an over compositing operation represented by said video node, in order to create said video node representing the video frames, wherein one or more attributes of the video frames are changeable by changing an attribute of said video node;
• and
• displaying means for displaying one or more of the video frames on a display device using said video node.

A computer readable storage medium encoded with a computer program for rendering an image, said image being formed by compositing one or more graphical primitives according to a compositing tree, said compositing tree comprising a plurality of nodes each representing a graphical primitive of said image or an operation for combining said graphical primitives, said computer readable storage medium comprising:

• means for representing at least one video frame of a video sequence by a first node;
• means for representing at least one video frame of the video sequence by a second image node;
• means for compositing the video frame represented by the first image node with a corresponding path graphical primitive for extracting a predetermined shape of an image, represented by a first primitive node of said compositing tree, according to at least one of an in compositing operation and an out compositing operation represented by a first composite node of said compositing tree, in order to generate a first composite image;
• means for compositing the video frame represented by the second image node with a further path graphical primitive represented by a second primitive node of said compositing tree, according to the at least one compositing operation represented by a second composite node of said compositing tree, in order to generate a second composite image;
• means for compositing the first and second composite images represented by the first and second composite nodes together, according to at least one of a plus compositing operation and an over compositing operation represented by a third composite node of said compositing tree, in order to render said image, wherein one or more attributes of said video frames are changeable by changing an attribute of the third composite node;
• and
• means for displaying said image on a display device.

A computer readable storage medium encoded with a computer program for creating a video node, said video node being created according to a compositing tree, said compositing tree comprising a plurality of nodes each representing a graphical primitive or an operation for combining said graphical primitives, said computer readable storage medium comprising:

• means for representing at least one video frame of a video sequence by a first image node;
• means for representing at least one video frame of the video sequence by a second image node;
• means for compositing the video frame represented by the first image node, with a corresponding path graphical primitive for extracting a predetermined shape of an image, represented by a first primitive node of said compositing tree, according to at least one of an in compositing operation and an out compositing operation represented by a first composite node of said compositing tree, in order to generate a first composite image;
• means for compositing the video frame represented by the second image node with a further path graphical primitive represented by a second primitive node of said compositing tree, according to the at least one compositing operation represented by a second composite node of said compositing tree, in order to generate a second composite image;
• means for compositing the first and second composite images represented by the first and second composite nodes together, according to at least one of a plus compositing operation and an over compositing operation represented by said video node, in order to create said video node representing the video frames, wherein one or more attributes of the video frames are changeable by changing an attribute of said video node;
• and
• means for displaying one or more of the video frames on a display device using said video node.