US 7,119,849 B2Granted

Multi-screen synthesis apparatus, method of controlling the apparatus, and program for controlling the apparatus

AssigneeCanon Kabushiki Kaisha

InventorsHideaki Yui, Takashi Tsunoda

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Abstract

There is provided a multi-screen synthesis apparatus that can execute display of video data and update of an OSD image without causing a user to feel a visual sense of incongruity, and reduce system costs. Periodic video source data and a periodic OSD image data are written into a unified memory reserved for planes. The video source data and the OSD image data are read from the unified memory, based on a synthesis layout, for simultaneous display on a single display in a synthesized state. Video data to be written into the unified memory is decimated in units of a frame on an input video source-by-input video source basis. The decimation of the data is controlled based on display priority of the video data determined based on a multi-screen display layout.

Claims8

Dependent claims

A multi-screen synthesis apparatus comprising:

a writing device that writes video data and OSD image data into a memory;
a reading device that reads the video data and the OSD image data from the memory, based on layout information;
a display control device that displays the video data and the OSD image data simultaneously on a common display device;
a frame decimation device that decimates frames of the video data to be written into the memory;
a control device that controls decimation of the frames of the video data to be written into the memory;
an attribute-determining device that determines attributes of the OSD image data, and
a display priority-determining device that determines display priority of the video data based on the layout information, and
wherein said control device controls said frame decimation device to decimate the frames of the input video data determined by said display priority-determining device to be lower in display priority on the basis of the attributes of the OSD image, during periods of the drawing of the OSD image is being carried out, in the case that a number of screens to be displayed on said display device exceeds a predetermined number,
wherein the attributes are determined based on media attributes attached to BML scripts of broadcast data.

6 more elements

A method of controlling a multi-screen synthesis apparatus, comprising:

a writing step of writing video data and OSD image data into a memory;
a reading step of reading the video data and the OSD image data from the memory, based on layout information;
a display control step of displaying the video data and the OSD image data simultaneously on a common display device;
a frame decimation step of decimating frames of the video data to be written into the memory;
a control step of controlling decimation of the frames of the video data to be written into the memory;
an attribute-determining step of determining attributes of mono-media of the OSD image data, and
a display priority-determining step of determining display priority of the video data based on the layout information, and
wherein said control step controls said frame decimation stee to decimate the frames of the inout video data determined by said display priority-determining step to be lower in display priority on the basis of the attributes of the OSD image, during periods of the drawing of the OSD image is being carried out, in the case that a number of screens to be displayed on said display device exceeds a predetermined number,
wherein the attributes are determined based on media attributes attached to BML scripts of broadcast data.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/404,911Filed 1 Apr 2003
Priority: JP 2002-0988341 Apr 2002
Published: US 2003/0231259 A118 Dec 2003
Granted: 10 Oct 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification17 codes

G06F 3/14
Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for…: digital…
G09G 5/14
Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators: display of multiple…
G09G 5/39
Characterised by the display of a graphic pattern, e.g. using an all-points-addressable [APA] memory: control of the bit-mapped memory
G09G 5/393
Control of the bit-mapped memory: arrangements for updating the contents of the bit-mapped memory