摘要:
A StatMux system and method are provided for efficiently allocating time slots on the transmission channel between bit streams representing video and bit streams representing data. By providing such a system and method, when a decreased number of data bits need to be transmitted, a decreased number of time slots may be allocated for transmitting the data bits and an increased number of time slots may be allocated for transmitting video bits. When a decreased number of video bits needs to be transmitted, a decreased number of time slots may be allocated for transmitting video bits and an increased number of time slots may be allocated for transmitting data bits.
摘要:
The present invention discloses a system and method for providing a rate control to an encoder, e.g., a H.264/MPEG-4 AVC compliant encoder. For example, the rate control method computes a target group of pictures (GOP) rate for a GOP of the input image sequence. The rate control method then computes a target rate per picture from the target GOP rate. In one embodiment, the target rate comprises at least one of: a frame picture target rate and a field picture target rate, wherein the field picture target rate is computed in accordance with two complexity measures for two predicted (P) fields, one complexity measure for one intra (I) field and one complexity measure for one bi-predicted (B) field.
摘要:
A method and apparatus for selecting a coding mode are described. For example, the method receives at least one block of a signal to be encoded. The method determines a frame vertical pixel difference in the at least one block and determines a field vertical pixel difference in the at least one block. The method then compares the frame vertical pixel difference with the field vertical pixel difference to determine a first coding mode for the at least one block.
摘要:
A method and apparatus for selecting a coding mode are described. For example, the method receives at least one block of a signal to be encoded. The method determines a frame vertical pixel difference in the at least one block and determines a field vertical pixel difference in the at least one block. The method then compares the frame vertical pixel difference with the field vertical pixel difference to determine a first coding mode for the at least one block.
摘要:
A method and apparatus for providing multi-panel rate control of real-time video digital encoders such as an MPEG or H series including the steps of bit allocation, rate control and adaptive quantization. Bit allocation assigns a target number of bits per group of pictures, and per picture of each type. Rate control adjusts the quantization parameter at the MB level to achieve that target number of bits per picture. Adaptive quantization further modulates the parameter per MB using local activity measure. Bit allocation and rate control can be implemented through a central control unit, or a central digital signal processor (DSP) while adaptive quantization can be implemented at the local panel.
摘要:
A StatMux system and method are provided for efficiently allocating time slots on the transmission channel between bit streams representing video and bit streams representing data. By providing such a system and method, when a decreased number of data bits need to be transmitted, a decreased number of time slots may be allocated for transmitting the data bits and an increased number of time slots may be allocated for transmitting video bits. When a decreased number of video bits needs to be transmitted, a decreased number of time slots may be allocated for transmitting video bits and an increased number of time slots may be allocated for transmitting data bits.
摘要:
A method and apparatus for selecting a coding mode for a block of a current picture are disclosed. For example, the method selects a coding mode in accordance with a cost function, for coding the block, wherein the cost function comprises a coding distortion parameter and a number of coding bits parameter, wherein said coding distortion parameter is measured in accordance with at least one of: between a prediction residual and a reconstructed prediction residual, or between a transformed prediction residual and a dequantized transformed prediction residual, wherein the number of coding bits parameter is computed in accordance with at least one of: from a true number of compressed bits resulting from coding said block, directly from a plurality of bins, or directly from a plurality of quantized transform coefficients.
摘要:
A method and apparatus for providing multi-panel rate control of real-time video digital encoders such as an MPEG or H series including the steps of bit allocation, rate control and adaptive quantization. Bit allocation assigns a target number of bits per group of pictures, and per picture of each type. Rate control adjusts the quantization parameter at the MB level to achieve that target number of bits per picture. Adaptive quantization further modulates the parameter per MB using local activity measure. Bit allocation and rate control can be implemented through a central control unit, or a central digital signal processor (DSP) while adaptive quantization can be implemented at the local panel.
摘要:
A method and apparatus for selecting a coding mode for a block of a current picture are disclosed. For example, the method selects a coding mode in accordance with a cost function, for coding the block, wherein the cost function comprises a coding distortion parameter and a number of coding bits parameter, wherein said coding distortion parameter is measured in accordance with at least one of: between a prediction residual and a reconstructed prediction residual, or between a transformed prediction residual and a dequantized transformed prediction residual, wherein the number of coding bits parameter is computed in accordance with at least one of: from a true number of compressed bits resulting from coding said block, directly from a plurality of bins, or directly from a plurality of quantized transform coefficients.
摘要:
A method is provided for determining cellular electrical potentials using a state estimator. The state estimator is generated using at least an electrical source model and an electrical conduction model. One or more parameters or states of the state estimator are adjusted based on a measured electrocardiographic and/or a measured body-surface-potential signal. The electrical potential of one or more cells is determined based on the one or more adjusted parameters or states. In one aspect of the present technique, one or more representations of an organ comprising the one or more cells is generated such that the electrical potential or its deriving characteristic of the one or more cells is visually indicated.