PLAYBACK APPARATUS, PLAYBACK METHOD, AND PROGRAM FOR PERFORMING STEREOSCOPIC PLAYBACK

• US 20100142924A1
• Filed: 11/17/2009
• Published: 06/10/2010
• Est. Priority Date: 11/18/2008
• Status: Active Grant

• Current Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Leichsenring, Germano, Yamashita, Ken
• Granted Patent: US 8,335,425 B2
• Time in Patent Office: Days
• US Class Current: 386/241
• CPC Class Codes: G11B 2220/2541 Blu-ray discs; Blue laser DVR discs
• CPC Class Codes: G11B 27/10 Indexing; Addressing; Timing or synchronising; Measuring tape travel
• CPC Class Codes: H04N 13/139 Format conversion, e.g. of frame-rate or size
• CPC Class Codes: H04N 13/161 Encoding, multiplexing or demultiplexing different image signal components for multi-view video sequence encoding H04N19/597
• CPC Class Codes: H04N 13/178 Metadata, e.g. disparity information
• CPC Class Codes: H04N 13/183 On-screen display [OSD] information, e.g. subtitles or menus
• CPC Class Codes: H04N 13/189 Recording image signals; Reproducing recorded image signals
• CPC Class Codes: H04N 5/84 using optical recording H04N5/80, H04N5/89, H04N5/91 take precedence

Abstract

In performing stereoscopic view, a shift information memory (21) stores, as a number of pixel lengths, an offset indicating how far in a right direction or a left direction to move coordinates of pixels to realize stereoscopic view. When realizing stereoscopic view, a plane shift engine (20) moves the coordinates of image data in a graphics plane in the right direction or the left direction by the number of pixel lengths indicated by the offset. When a scale of video data targeted for stereoscopic view is changed by a basic graphics plane (15), a shift distance of pixel coordinates by the plane shift engine (20) is based on a number of pixel lengths obtained by multiplying the offset by a changed scaling factor in the horizontal direction.

Claims

1. A playback apparatus that realizes stereoscopic playback comprising:

a video decoder operable to obtain video frames by decoding a video stream;

a plane memory that stores therein graphics data having a resolution of a predetermined number of horizontal and vertical pixels;

an offset storage unit that stores therein an offset indicating a number of pixel lengths for the graphics data;

a shift engine operable to shift respective coordinates of the pixels in a left direction by a shift distance based on the offset, and to shift the respective coordinates of the pixels in a right direction by the shift distance, to realize stereoscopic playback; and

a composition unit operable to composite the obtained video frames with the graphics data in which the coordinates of the pixels therein have been shifted in each of the left direction and the right direction respectively, wherein

when a scaling factor of the video frames to be composited is changed to a value other than 1, the shift distance of the shift engine is based on a value obtained by multiplying the offset by the scaling factor.

2. The playback apparatus of claim 1 wherein

when the scaling factor is less than 1,

the shift distance is a number of pixel lengths obtained by multiplying the offset by the scaling factor and rounding up any numerical value after a decimal point thereof.

3. The playback apparatus of claim 1 wherein

the graphics written in the frame memory have been written by an application, and

the scaling factor is specified by the application.

4. The playback apparatus of claim 1 wherein

the graphics written in the plane memory are constituted from a graphical user interface that receives a user operation, and

the scaling factor is specified by the user operation.

5. The playback apparatus of claim 1 wherein

the multiplication to obtain the shift distance is performed even when the playback apparatus sets a keep resolution mode for preserving a resolution of the graphics data in the plane memory.

6. The playback apparatus of claim 1 wherein

the shift engine includes a mapping table showing a plurality of shift distances, each shift distance corresponding to a scaling factor, and

the multiplication to obtain the shift distance is performed with use of a shift distance, read from the mapping table, that corresponds to the scaling factor specified by the application.

7. The playback apparatus of claim 1 wherein

the shift engine includes:

a previous information storage unit that stores therein, as previous information, an offset from before scaling,

a subsequent information storage unit that stores, as subsequent information, a shift distance of pixels after scaling has completed, that is a number of pixel lengths obtained by multiplying the offset by the scaling factor, and

a frame counter that indicates a number of frames i indicating how many frames have passed since generation of a scaling instruction, and updates the number of frames i as frame processing progresses, and

letting a shift distance D(N) be a shift distance when N frames have passed after the generation of the scaling instruction,

letting a shift distance D(i) be a shift distance when i frames (i≦

N) have passed after the generation of the scaling instruction,

the shift distance in the graphics data is calculated with use of the shift distance D(i), the shift distance D(N) obtained in accordance with the previous information, the subsequent information, and the multiplication, and the number of frames i updated by the frame counter.

8. The playback apparatus of claim 1 wherein

the frame counter includes a frame update span storage unit that stores therein a frame update span indicating a number of frames over which to perform shifting, and

the closer the updated number of frames i approaches the frame update span, the larger the shift distance D(i) becomes.

9. The playback apparatus of claim 7 wherein

the frame counter includes a frame update span storage unit that stores therein a frame update span indicating a number of frames over which to perform shifting, and

the playback apparatus only outputs the video frames until the number of frames i arrives at the frame update span, and when the updated number of frames i arrives at the frame update span, shifting the coordinates in the pixels by the shift distance D(N) is performed, and the pixels in the plane memory are composited with the pixels in the video frames.

10. The playback apparatus of claim 1 wherein

the shift distance obtained by the multiplication is a shift distance D(N) when N frames have passed since a generation of a scaling instruction, and

a shift distance D(i), that is a shift distance when i frames have passed after the generation of the scaling instruction (i≦

N), is calculated according to the following expression;

shift distance D(i)=(Offset−

(Factor×

Offset))×

(i/N)

Offset;

number of pixel lengths indicated by the offset

Factor;

scaling factor.

11. The playback apparatus of claim 1 wherein

the plane memory is a graphics plane storing therein graphics data,

the playback apparatus further includes a video plane that is a plane memory storing therein the video frames obtained by decoding,

the shift engine, when scaling is performed on the video frames in the video plane, shifts the graphics data stored in the graphics plane and the coordinates of the pixels included in the video frames, and

when the plane shift engine shifts the pixels of the video frames in the video plane, a relative value of the shift distance of the pixels in the video plane and the shift distance of the pixels in the graphics plane is a value based on a number of pixel lengths obtained by multiplying the offset by the changed scaling factor.

12. The playback apparatus of claim 11 wherein

a plane offset V of coordinates of image data in the video plane is calculated according to the following expression:

coordinate plane offset V=D(Factor×

D)

D;

Offset in the graphics plane

Factor;

scaling factor.

13. A playback method for realizing stereoscopic playback on a computer, comprising the steps of:

obtaining video frames by decoding a video stream;

writing graphics data having a resolution of a predetermined number of horizontal and vertical pixels in a plane memory in the computer;

acquiring an offset indicating a number of pixel lengths for the graphics data;

shifting respective coordinates of the pixels in a left direction by a shift distance based on the offset, and shifting the respective coordinates of the pixels in a right direction by the shift distance, to realize stereoscopic playback; and

compositing the obtained video frames with the graphics data in which the coordinates of the pixels therein have been shifted in each of the left direction and the right direction respectively, wherein

when a scaling factor of the video frames to be composited is changed to a value other than 1, the shift distance of the shifting step is based on a value obtained by multiplying the offset by the scaling factor.

14. A program for realizing stereoscopic playback on a computer, comprising the steps of:

obtaining video frames by decoding a video stream;

writing graphics data having a resolution of a predetermined number of horizontal and vertical pixels in a plane memory in the computer;

acquiring an offset indicating a number of pixel lengths for the graphics data;

shifting respective coordinates of the pixels in a left direction by a shift distance based on the offset, and shifting the respective coordinates of the pixels in a right direction by the shift distance, to realize stereoscopic playback; and

compositing the obtained video frames with the graphics data in which the coordinates of the pixels therein have been shifted in each of the left direction and the right direction respectively, wherein

when a scaling factor of the video frames to be composited is changed to a value other than 1, the shift distance of the shifting step is based on a value obtained by multiplying the offset by the scaling factor.