TY - JOUR
T1 - Two-layer coding for videotelephone
AU - Sankur, B.
AU - van Schijndel, R. A.
AU - van der Lubbe, J. C.A.
PY - 1993/1/1
Y1 - 1993/1/1
N2 - Design of a two-layer coding scheme is considered under the constraint that the first layer running at 64 kbit/s is to perform the normal H.261 functions. The second layer is recruited optionally to enhanced the image quality and/or to increase the frame rate. In the chosen scheme, the second laeyr processes the difference between the original signal and the reconstruction of the first layer, by a combination of DCT and pixel correction techniques. While SNR improvements achieved were of the order of 1 dB, subjective tests indicated a much stronger preference for the two-layer codec.
AB - Design of a two-layer coding scheme is considered under the constraint that the first layer running at 64 kbit/s is to perform the normal H.261 functions. The second layer is recruited optionally to enhanced the image quality and/or to increase the frame rate. In the chosen scheme, the second laeyr processes the difference between the original signal and the reconstruction of the first layer, by a combination of DCT and pixel correction techniques. While SNR improvements achieved were of the order of 1 dB, subjective tests indicated a much stronger preference for the two-layer codec.
KW - Two-layer coding
KW - videophone
UR - http://www.scopus.com/inward/record.url?scp=0027680110&partnerID=8YFLogxK
U2 - 10.1016/0923-5965(93)90052-U
DO - 10.1016/0923-5965(93)90052-U
M3 - Article
AN - SCOPUS:0027680110
VL - 5
SP - 295
EP - 303
JO - Signal Processing: Image Communication
JF - Signal Processing: Image Communication
SN - 0923-5965
IS - 4
ER -