US Patent No: 5,612,900
Number of patents in Portfolio can not be more than 2000
Video encoding method and system which encodes using a rate-quantizer model
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Mar 18, 1997
Issued date -
Aug 31, 1995
filing date -
08/522,495
serial no -
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Abstract
A system and method for determining quantization level versus bit-rate characteristics of raw video signals in video frames during a pre-encoding phase for video technologies such as MPEG and MPEG-2. During a pre-encoding phase, various quantization levels are assigned to various parts of a frame, and the frame is then pre-encoded to determine a bit-rate for each quantization level used in the pre-encoding phase. Depending on the embodiment, quantization levels are assigned in one of many ways: checkerboard style, block style or any other distribution that avoids statistical anomalies. The method and system repeat the pre-encoding for plural frames, recording all quantization level versus bit-rate statistics on a frame by frame basis. These statistics are then used during encoding or re-encoding of a digital video to control the number of bits allocated to one segment of the digital video as compared to another segment, based on a target quality and target storage size for each segment. The resulting encoded digital video is stored on a digital storage medium, such as a compact disc.
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 5,488,570 Encoding and decoding video signals using adaptive filter switching criteria | 109 | 1994 | |
| 5,535,138 Encoding and decoding video signals using dynamically generated quantization matrices | 18 | 1994 | |
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| 5,028,999 Source encoder for video pictures having a quantizer whose stepsize is controlled in an incremental manner | 9 | 1988 | |
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| 4,517,596 System comprising a preliminary processing device controlled in accordance with an amount of information stored in a buffer | 38 | 1982 | |
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| 5,335,016 Image data compressing/coding apparatus | 97 | 1992 | |
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| 5,283,646 Quantizer control method and apparatus | 193 | 1992 | |
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| 5,381,275 Apparatus and method for recording digital data with a controlled data compression ratio | 38 | 1993 | |
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| 5,016,010 System for controlling a number of bits required to represent coded output data | 18 | 1990 | |
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| 5,400,077 System for generating multiple aspect ratio video signals from motion picture disk recorded in a single aspect ratio | 113 | 1993 | |