Method and Apparatus to Determine Added Graphics Layers in a Video Image Signal
AssigneeSupponor Oy
InventorsNiko Nevatie, Dmitry Sushko
Life of this patent
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Abstract
An original image layer is mixed with one or more graphics layers to form a composite video signal, such as in a vision mixer. Also, the same graphics layers are mixed identically into another, known background image layer to give a second composite video signal. The currently applied added graphics layers are determined, without directly accessing the added graphics layers themselves, using only the first and second composite video signals, the original image layer, and the known background image, such as in a graphics layer detection device. A triangulation matting algorithm may be used in one example.
Claims15
A graphics detector device to detect one or more graphics layers which have been added into a video signal by a vision mixer, wherein the device comprises a processor and a memory and is configured to:
- receive the video signal from the vision mixer having the graphics layers added therein, and a first original image signal into which the graphics layers were added by the vision mixer to produce the video signal;
- establish a constant background signal which is shared with the vision mixer;
- obtain a second composite image signal having the graphics layers added into the constant background signal likewise to the video signal;
- derive a detected graphics signal from the video signal, the first original image signal, the constant background signal, and the second composite image signal, wherein the detected graphics signal represents the one or more graphics layers which have been added into the video signal;
- and
- output the detected graphics signal onto a tangible non-transient recording medium.
A system for determining added graphics layers in a video image signal, comprising:
- a vision mixer configured to produce at least a first original image signal comprising a first original image layer, a first composite image signal having one or more graphics layers mixed into the first original image layer, and a second composite image signal having the said one or more graphics layers mixed likewise into a second original image layer which is distinct from the first original image layer;
- and
- a graphics detector device coupled by communication links to the vision mixer to receive at least said first original image layer signal, said first composite image signal, and said second composite image signal and configured to output an added graphics layer signal representing said one or more graphics layers, the added graphics layer signal being derived from the first original image layer, the second original image layer, the first composite image signal, and the second composite image signal.
A method for determining added graphics layers in a video image signal, comprising:
- receiving at least a first original image layer, and a first composite image having one or more graphics layers mixed into the first original image layer;
- establishing a second original image layer which is different from the first original image layer;
- obtaining a second composite image having the said one or more graphics layers mixed likewise into the second original image layer;
- deriving a detected graphics signal representing the one or more added graphics layers from the first original image layer, the second original image layer, the first composite image, and the second composite image;
- and
- outputting said detected graphics signal onto a tangible non-transient recording medium.
Dependencies are inferred from the claim text.