Process and system for encoding and playback of stereoscopic video sequences
View Patent ↗A method for decoding a compressed image stream, the image stream having a plurality of frames, each frame consisting of a merged image including pixels from a left image and pixels from a right image. The method involves the steps of receiving each merged image; changing a clock domain from the original input signal to an internal domain; for each merged image, placing at least two adjacent pixels into an input buffer and interpolating an intermediate pixel, for forming a reconstructed left frame and a reconstructed right frame according to provenance of the adjacent pixels; and reconstructing a stereoscopic image stream from the left and right image frames. The invention also teaches a system for decoding a compressed image stream.
1. A method for encoding a stereoscopic image stream comprised of a plurality of right-eye and left-eye image frames into a standard compressed digital stream containing merged video frames each containing spatially compressed subimages, the method comprising:
spatially compressing in a processor said plurality of right-eye and left-eye image frames by keeping complementary mosaics of pixels according to different spatial subsampling patterns to form field subimages so as to have pixels sampled from different spatial coordinates;
concatenating in a processor said subimages to form merged video frames; and
encoding in a processor said merged video frames according to said compressed digital format.
2. The method as claimed in claim 1 , wherein said mosaics are checkerboard mosaics.
3. The method as claimed in claim 2 , wherein said subimages are concatenated side-by-side to contain one left-eye image field and one right-eye image field.
4. The method as claimed in claim 3 , wherein said encoding comprises MPEG encoding of said merged video frames.
5. The method as claimed in claim 4 , wherein said encoding comprises MPEG-2 encoding of said merged video frames.
6. A method for decoding a stereoscopic digital image stream containing merged right-eye and left-eye image frames having a plurality of field subimage areas of pixels subsampled from right-eye and left-eye image frames, the method comprising:
decompressing said digital image stream to obtain said merged image frames;
arranging in a processor pixels from said merged image frames in accordance with a first spatial decoding pattern of pixels to form a portion of the pixels of decoded right-eye image frames;
arranging in a processor pixels from said merged image frames in accordance with a second spatial decoding pattern of pixels to form a portion of the pixels of decoded left-eye image frames, wherein coordinates of the portion of pixels of decoded left-eye image frames are different from coordinates of the portion of pixels of decoded right-eye image frames; and
interpolating in a processor pixels obtained from said merged image frames to complete pixels in said decoded right-eye image frames and to complete pixels in said decoded left-eye image frames.
7. The method as claimed in claim 6 , wherein a first spatial subsampling pattern is a checkerboard mosaic and said first decoding pattern arranges said portion of the pixels of decoded right-eye images into a checkerboard mosaic, and a second spatial subsampling pattern is a checkerboard mosaic opposite said first spatial subsampling pattern and said second decoding pattern arranges said portion of the pixels of decoded left-eye images into a checkerboard mosaic opposite said portion of the pixels of decoded right-eye images.
8. The method as claimed in claim 7 , wherein said merged image frames comprise a pair of side-by-side field areas.
9. The method as claimed in claim 8 , wherein said decompressing comprises MPEG decoding.
10. The method as claimed in claim 9 , wherein said decompressing comprises MPEG-2 decoding.
11. An encoder for processing a stereoscopic image stream comprised of a plurality of right-eye and left-eye image frames into a standard compressed digital stream containing merged video frames each containing spatially compressed subimages, the encoder comprising at least one processor configured to perform:
spatially compressing said plurality of right-eye and left-eye image frames by keeping complementary mosaics of pixels according to different spatial subsampling patterns to form field subimages so as to have pixels sampled from different spatial coordinates;
concatenating said subimages to form merged video frames; and
encoding said merged video frames according to said compressed digital format.
12. The encoder as claimed in claim 11 , wherein said mosaics are checkerboard mosaics.
13. The encoder as claimed in claim 12 , wherein said subimages are concatenated side-by-side to contain one left-eye image field and one right-eye image field.
14. The encoder as claimed in claim 13 , wherein said encoding comprises MPEG encoding of said merged video frames.
15. The encoder as claimed in claim 14 , wherein said encoding comprises MPEG-2 encoding of said merged video frames.