Method and apparatus for video buffer verifier underflow and overflow control
OwnerKwong Huang Goh, Hui Y. W. Lucasinventors
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Abstract
A method and apparatus for Video Buffer Verifier (VBV) underflow and overflow control. A combination of picture and slice level control is used in the method and apparatus. Improved prevention of overflow and panic mode encoding is achieved by means of adjustment of the virtual buffer-fullness which allows the quantization-step to have an improved response to the buffer-fullness at both high and low critical levels. The use of a non-linear quantization scheme and customised quantization matrices also provide improved prevention of panic mode encoding. The slice level control also reduces the computation complexity compared to the macroblock level control.
Claims15
A method for Video Buffer Verifier (VBV) control of a video encoder, whereby picture and/or slice level controls are implemented in the method, said picture and/or slice level controls including:
- virtual buffer fullness control for increasing the sensitivity of a quantization-step;
- and/or
- quantization-step range control for increasing the range of the quantization-step;
- and
- quantization matrices modification for the prevention of panic mode coding.
Apparatus for Video Buffer Verifier (VBV) control of a video encoder, whereby the apparatus contains integrated picture and/or slice level controls, said picture and/or slice level controls including:
- a virtual buffer-fullness control for increasing the sensitivity of a quantization-step;
- and/or a quantization-step range control for increasing the range of the quantization-step;
- and
- quantization matrices modification for the prevention of panic mode coding.
A method for Video Buffer Verifier (VBV) control of a video encoder, substantially according to the method described in the specification with reference to the accompanying figures.
An apparatus for Video Buffer Verifier (VBV) control of a video encoder, substantially according to the embodiment described in the specification with reference to and as illustrated in the accompanying figures.
Dependencies are inferred from the claim text.