-
公开(公告)号：DE69813911D1
公开(公告)日：2003-05-28
申请号：DE69813911
申请日：1998-10-13
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI , OH LYE , BARD JEAN-MICHEL
IPC: H04N7/26
-
公开(公告)号：DE69816875T2
公开(公告)日：2004-04-22
申请号：DE69816875
申请日：1998-05-30
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI
Abstract: A method and apparatus for encoding pictures of a moving pictures sequence according to an overall target bit-rate, such as in a MPEG video encoder. Each picture has an assigned picture coding type for which a quality factor is adaptively determined according to past bit usages, so that bits can be adaptively allocated amongst picture types for optimizing visual quality of the encoded pictures.
-
公开(公告)号：DE69813911T2
公开(公告)日：2004-02-05
申请号：DE69813911
申请日：1998-10-13
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI , OH LYE , BARD JEAN-MICHEL
IPC: H04N7/26
-
-
公开(公告)号：DE69736440D1
公开(公告)日：2006-09-14
申请号：DE69736440
申请日：1997-09-26
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI
IPC: H04H20/88
Abstract: A method and apparatus for decoding a multi-channel audio bitstream in which adaptive frequency domain downmixer (3) is used to downmix, according to long and shorter transform block length information (17), the decoded frequency coefficients of the multi-channel audio (12,13,14,15) such that the long and shorter transform block information is maintained separately within the mixed down left and right channels. In this way, the long and shorter transform block coefficients of the mixed down let and right channels can be inverse transformed adaptively (4,5,6,7) according to the long and shorter transform block information, and the results of the inverse transform of the long and short block of each the left and right channel added together (8,9) to form the total mixed down output of the left and right channel.
-
Patent Agency Ranking
公开(公告)号：DE69734782D1
公开(公告)日：2006-01-05
申请号：DE69734782
申请日：1997-09-26
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI , GEORGE SAPNA
IPC: H04H20/88
Abstract: A method and apparatus for decoding a bitstream (100) of transform coded multi-channel audio data. The bitstream is subjected to a block decoding process (101) to obtain for each input audio channel within the multi-channel audio data a corresponding block of frequency coefficients (102). Each block of frequency coefficients (102) is assigned a higher precision inverse transform or a lower precision inverse transform according to predetermined characteristics of the audio data represented by the block. The blocks of frequency coefficients are subsequently subjected to the assigned transform (105, 106) and an output audio signal (108) is generated in response to each of the higher and lower precision inverse transform processes.
-
公开(公告)号：DE69813632T2
公开(公告)日：2004-01-29
申请号：DE69813632
申请日：1998-05-12
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI
IPC: H04N7/50
Abstract: This method and apparatus described herein imposes masking factors to the determined quantization step sizes of macroblocks of a video sequence such that encoding efficiency is increased. A conditional masking method can be used to take advantage of the fact that P-pictures are more important than B-pictures in terms of motion and scene updates as coding noise in such updates are likely propagated by P-pictures. The masking can be applied conditionally to motion/scene update regions of a picture such that coding noise is reduced and therefore bits are saved from less propagation of this noise. Before encoding each macroblock of a picture from an input video sequence, a video encoder with conditional masking determines if the macroblock type belongs to a significant motion or scene update region. A conditional masking factor is then determined for the macroblock based on the determined macroblock type and the picture coding type.The conditional masking factor is combined with a macroblock reference quantization step-size which may be calculated using conventional methods based on bit allocation and bit utilization, and an optional activity masking factor based on activity level of the macroblock and/or its surrounding region to form the final quantization step-size for coding of the macroblock.
-
公开(公告)号：DE69816875D1
公开(公告)日：2003-09-04
申请号：DE69816875
申请日：1998-05-30
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI
Abstract: A method and apparatus for encoding pictures of a moving pictures sequence according to an overall target bit-rate, such as in a MPEG video encoder. Each picture has an assigned picture coding type for which a quality factor is adaptively determined according to past bit usages, so that bits can be adaptively allocated amongst picture types for optimizing visual quality of the encoded pictures.
-
-
公开(公告)号：DE69813632D1
公开(公告)日：2003-05-22
申请号：DE69813632
申请日：1998-05-12
Applicant: ST MICROELECTRONICS ASIA
Inventor： HUI WAI
IPC: H04N7/50
Abstract: This method and apparatus described herein imposes masking factors to the determined quantization step sizes of macroblocks of a video sequence such that encoding efficiency is increased. A conditional masking method can be used to take advantage of the fact that P-pictures are more important than B-pictures in terms of motion and scene updates as coding noise in such updates are likely propagated by P-pictures. The masking can be applied conditionally to motion/scene update regions of a picture such that coding noise is reduced and therefore bits are saved from less propagation of this noise. Before encoding each macroblock of a picture from an input video sequence, a video encoder with conditional masking determines if the macroblock type belongs to a significant motion or scene update region. A conditional masking factor is then determined for the macroblock based on the determined macroblock type and the picture coding type.The conditional masking factor is combined with a macroblock reference quantization step-size which may be calculated using conventional methods based on bit allocation and bit utilization, and an optional activity masking factor based on activity level of the macroblock and/or its surrounding region to form the final quantization step-size for coding of the macroblock.
-
-
-
-
-
-
-
-
-
Search Results
10
records
(took 0.025 seconds)
