A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna...
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Transcript of A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna...
![Page 1: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/1.jpg)
A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences
Shahram Shirani, Berna Erol, and Faouzi KossentiniIEEE TRANSACTIONS ON MULTIMEDIA, VOL. 2, NO. 3, SEPTEMPER 2000
![Page 2: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/2.jpg)
Outline
introduction MPEG-4: video compression and error
resilience concealment of channel errors in
MPEG-4 coded video proposed method experimental results
![Page 3: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/3.jpg)
Introduction
![Page 4: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/4.jpg)
MPEG-4 : Video Compression and Error Resilience
MPEG-4 offers error resilience tools:– video packetization– data partition– reversible VLC
![Page 5: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/5.jpg)
MPEG-4 : Error Resilience
video packetization– The macroblock data between two resynchronization
markers is referred to as a video packet. data partition I-VOPs P-VOPs
reversible VLC
![Page 6: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/6.jpg)
Concealment of Channel Errors in MPEG-4 Coded Video Data
P-VOPs
I-VOPs
![Page 7: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/7.jpg)
Proposed method
![Page 8: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/8.jpg)
Proposed method
The boundary transform:– if all the four neighboring pixels of a pixel are inside the
shape, then the pixel is declared inside. Otherwise, the pixel is assigned to the border of the shape.
![Page 9: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/9.jpg)
Experimental Results
The similarity of the erroneous and error concealed shape data to the original shape data is measures using the following ratio:
– nd : the number of pixels that are different between the restored shape and the original one
– nt : the total number of pixels in the bounding box
![Page 10: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/10.jpg)
Experimental Results (AKIYO)
272x208 30% missing
88%
99% (Mp-Mm)/M
= 17%
![Page 11: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/11.jpg)
Experimental Results (BREAM)
144x192 29% missing
81%
(Mp-Mm)/M
98% = 22%
![Page 12: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/12.jpg)
Experimental Results (BREAM)
272x192
25% missing
86%
99%
![Page 13: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/13.jpg)
Experimental Results (WEATHER)
160x224
35% missing
87%
99%
![Page 14: A Concealment Method for Shape Information in MPEG-4 Coded Video Sequences Shahram Shirani, Berna Erol, and Faouzi Kossentini IEEE TRANSACTIONS ON MULTIMEDIA,](https://reader030.fdocuments.in/reader030/viewer/2022032523/56649d805503460f94a640bd/html5/thumbnails/14.jpg)
Conclusions
The paper presents an error concealment method for shape information in the MPEG-4 coded video sequences.
The proposed concealment method successfully reconstructs the missing shape data providing about 20% improvement compared to median filtering method.
Reasonable computational complexity of our algorithm makes it suitable for real-time application.