TY - JOUR
T1 - Global brightness-fluctuation compensation in video coding
AU - Kamikura, Kazuto
AU - Jozawa, Hirohisa
AU - Watanabe, Hiroshi
AU - Kotera, Hiroshi
PY - 1997/12/1
Y1 - 1997/12/1
N2 - A global brightness-fluctuation compensation (GBC) scheme is proposed to improve coding efficiency for video scenes that contain global brightness fluctuations caused by fade- in/out, camera-iris adjustment, and so on. In this scheme, a set of two brightness-fluctuation parameters, which represent contrast and offset components of the brightness fluctuation in the whole frame, is first estimated. The brightness fluctuation is then compensated using the parameters. Furthermore, a block-by-clock ON/OFF control method for GBC is introduced to improve coding performance even for scenes including local fluctuations in brightness caused by camera flashed, spotlights, and the like. In this method, GBC is performed only on the blocks where the sum of the squared error produced using GBC is less than that produced without GBC. Simulation results show that the proposed GBC scheme with the ON/OFF control method greatly improves coding efficiency, especially for sequences with considerable global brightness fluctuation.
AB - A global brightness-fluctuation compensation (GBC) scheme is proposed to improve coding efficiency for video scenes that contain global brightness fluctuations caused by fade- in/out, camera-iris adjustment, and so on. In this scheme, a set of two brightness-fluctuation parameters, which represent contrast and offset components of the brightness fluctuation in the whole frame, is first estimated. The brightness fluctuation is then compensated using the parameters. Furthermore, a block-by-clock ON/OFF control method for GBC is introduced to improve coding performance even for scenes including local fluctuations in brightness caused by camera flashed, spotlights, and the like. In this method, GBC is performed only on the blocks where the sum of the squared error produced using GBC is less than that produced without GBC. Simulation results show that the proposed GBC scheme with the ON/OFF control method greatly improves coding efficiency, especially for sequences with considerable global brightness fluctuation.
KW - Brightness-fluctuation compensation
KW - Fade-in/out
KW - Low bitrate coding
KW - Video compression
UR - http://www.scopus.com/inward/record.url?scp=0346534272&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0346534272&partnerID=8YFLogxK
U2 - 10.1117/12.263208
DO - 10.1117/12.263208
M3 - Conference article
AN - SCOPUS:0346534272
SN - 0277-786X
VL - 3024
SP - 1285
EP - 1293
JO - Proceedings of SPIE - The International Society for Optical Engineering
JF - Proceedings of SPIE - The International Society for Optical Engineering
T2 - Visual Communications and Image Processing '97
Y2 - 12 February 1997 through 12 February 1997
ER -