Video encoding method and system which encodes using a rate-quantizer model
First Claim
1. A method for processing video signals included in video frames to determine characteristics of the video frames, comprising the steps of:
- a) obtaining video signals included in plural video frames;
b) assigning plural quantization levels to one of said plural video frames;
c) pre-encoding said one of said plural video frames using said plural quantization levels to obtain plural bit-rates corresponding to each of said plural quantization levels;
d) determining bit-rates for each of said plural quantization levels resulting from said pre-encoding step;
e) repeating steps b-d sequentially for plural succeeding video frames; and
f) encoding a plurality of said plural video frames after determining the bit-rates for each of said plural video frames.
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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.
132 Citations
35 Claims
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1. A method for processing video signals included in video frames to determine characteristics of the video frames, comprising the steps of:
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a) obtaining video signals included in plural video frames; b) assigning plural quantization levels to one of said plural video frames; c) pre-encoding said one of said plural video frames using said plural quantization levels to obtain plural bit-rates corresponding to each of said plural quantization levels; d) determining bit-rates for each of said plural quantization levels resulting from said pre-encoding step;
e) repeating steps b-d sequentially for plural succeeding video frames; andf) encoding a plurality of said plural video frames after determining the bit-rates for each of said plural video frames. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A system for processing video signals included in video frames to determine characteristics of video frames, comprising:
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means for obtaining video signals included in plural video frames; means for assigning plural quantization levels to a first plurality of said plural frames of the video signals; means for pre-encoding each video frame in said first plurality of said plural video frames using said quantization levels to obtain plural bit-rates corresponding to each of said plural quantization levels; means for determining said plural bit-rates for each of said plural quantization levels for each video frame in said first plurality of said plural video frames generated by said means for pre-encoding; and means for encoding a second plurality of said plural video frames after determining said plural bit-rates for each video frame in said first plurality of said plural frames. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification