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US 8,798,137 B2Granted
Bit rate estimation in data or video compression
AssigneeCity University of Hong Kong
InventorsLai-Man Po, Mohammed Golam Sarwer
Life of this patent
Estimating the term…
Abstract
To reduce the complexity of rate-distortion cost computation in AVC (MPEG4 Part2/H.264), a bit rate estimation method is used to avoid entropy coding during Intra and Inter mode decision. The bit rate estimation method predicts the number of entropy coded bits based on the quantized transform coefficients, thus avoiding the need to entropy code the quantized transform coefficients at each decision iteration.
Claims14
A method of transmitting compressed data at a minimized bit rate over a network, the method comprising:
- estimating a minimized bit rate required for compressing the data using an encoding scheme comprising
- predicting bit rates of each of a plurality of symbols of the encoding scheme, without compressing the data to be compressed, based on characteristics of the data and codes of the encoding scheme, and
- computing a computed bit rate required for compressing the data by summing the bit rates predicted for each of the symbols;
- compressing the data using the computed bit rate to produce compressed data;
- and
- transmitting the compressed data to a network.
3 more elements
A method of transmitting compressed video data over a network, the method comprising:
- determining an optimum mode for compressing video data comprising
- finding difference image data of a selected block of a video frame using a predictive mode,
- transforming and quantizing the difference image data to produce quantized data,
- estimating a minimized bit rate required for compressing the quantized data using an encoding scheme, wherein estimating the minimized bit rate includes
- predicting bit rates of each of a plurality of symbols of the encoding scheme, without compressing the quantized data to be compressed, based on characteristics of the quantized data and codes of the encoding scheme, and
- computing a computed bit rate by summing the bit rates predicted for each of the symbols;
- iteratively repeating the foregoing steps, using different predictive modes, until an optimum mode for compressing the video data is found;
- compressing the video data using the optimized mode to produce compressed video data;
- and
- transmitting the compressed video data to a network.
7 more elements
Dependencies are inferred from the claim text.