摘要:
In one embodiment, a method for encoding content includes receiving source content and encoding the source content into a plurality of content streams. The encoding includes aligning the plurality of content streams at Group of Pictures (GOP) boundaries. The encoding further includes embedding, in each content stream, metadata identifying segmentation points within the content stream, where the segmentation points correspond to one or more of the GOP boundaries.
摘要:
In one embodiment, a method for encoding content includes receiving source content and encoding the source content into a plurality of content streams. The encoding includes aligning the plurality of content streams at Group of Pictures (GOP) boundaries. The encoding further includes embedding, in each content stream, metadata identifying segmentation points within the content stream, where the segmentation points correspond to one or more of the GOP boundaries.
摘要:
A detector for determining an audio data bit rate of a pre-compressed audio elementary stream (AES), in which the pre-compressed AES includes a plurality of preamble length fields is provided. The detector includes an analyzer module configured to determine one or more candidate audio data bit rates of the AES from the plurality of preamble length fields, a detector module configured to determine whether one or more of the candidate audio data bit rates are correct, and a selector module configured to select one of the one or more candidate audio data bit rates determined to be correct as the audio data bit rate of the pre-compressed AES.
摘要:
A method (50) and apparatus (40) for reducing noise in a video signal calculates (53) a discrimination value of a filter based on a magnitude difference between a current frame and a prior frame of a sequence of frames and modifies (54) the current frame using the modified discrimination value. The output of the filter is calculated as follows: g(i, j, k)=f(i, j, k)±β wherein: f (i, j, k) is the current frame input to the filter; g(i, j, k) is the current frame output from the filter; and β is the discrimination value of the filter, which is calculated as follows: β = { κδ ′ + χ , δ ′ = max { δ , δ 0 } , δ
摘要:
The present invention discloses a system and method for adaptive adjustment of bit budget that favors the allocation of bits to intra coding frames (I frames). Namely, an encoder is able to dynamically adjust the bit budget for each picture type in an image sequence, thereby effecting proper usage of the available transmission bandwidth and improving the picture quality. In one embodiment, the present invention will allocate more encoding bandwidth to a current Intra coding frame when the average quantization level of inter coding frames (e.g., P and B frames) of a previous group of pictures is relatively high.
摘要:
A statistical multiplexer for coding and multiplexing multiple channels of digital television data, or multiple panels of HDTV digital television data. A bit rate need parameter is determined for each encoder in a stat mux group by scaling the complexities of previous pictures of the same and different picture types. Scaling factors based on an activity level, motion estimation score, and number of pictures of a certain type in a GOP, may be used. Moreover, the scaling factors may be bounded based on a linear or non-linear operator to prevent large variations in the factors. An encoding bit rate is allocated to each channel based on its need parameter.
摘要:
A detector for determining an audio data bit rate of a pre-compressed audio elementary stream (AES), in which the pre-compressed AES includes a plurality of preamble length fields is provided. The detector includes an analyzer module configured to determine one or more candidate audio data bit rates of the AES from the plurality of preamble length fields, a detector module configured to determine whether one or more of the candidate audio data bit rates are correct, and a selector module configured to select one of the one or more candidate audio data bit rates determined to be correct as the audio data bit rate of the pre-compressed AES.
摘要:
A method (50) and apparatus (40) for reducing noise in a video signal calculates (53) a discrimination value of a filter based on a magnitude difference between a current frame and a prior frame of a sequence of frames and modifies (54) the current frame using the modified discrimination value. The output of the filter is calculated as follows: g(i, j, k)=f(i, j, k)±β wherein: f(i, j, k) is the current frame input to the filter; g(i, j, k) is the current frame output from the filter; and β is the discrimination value of the filter, which is calculated as follows: β = { κδ ′ + χ , δ ′ = max { δ , δ 0 } , δ
摘要:
Noise is reduced in a video system by applying motion compensated temporal filtering using previously generated motion vectors and adaptive spatial filtering at scene change frames. Various types of noise can be introduced into video prior to compression and transmission. Artifacts arise from recording and signal manipulation, terrestrial or orbital communications, or during decoding. Noise introduced prior to image compression interferes with performance and subsequently impairs system performance. While filtering generally reduces noise in a video image, it can also reduce edge definition leading to loss of focus. Filtering can also tax system throughput, since increased computational complexity often results from filtering schemes. Furthermore, the movement of objects within frames, as defined by groups of pixels, complicates the noise reduction process by adding additional complexity. In addition to improvements made to FIR spatial filtering, the present invention improves on previous filtering techniques by using Infinite Impulse Response (IR) temporal filtering to reduce noise while maintaining edge definition. It also uses motion vectors previously calculated as part of the first-pass image encoding or alternatively by transcoding to reduce computational complexity for P-frame and B-frame image preprocessing. Single stage P-frame temporal noise filtering and double stage B-frame temporal noise filtering are presented.
摘要:
A method for managing delivery of encoded bits to a decoder is disclosed. In the method, a number of bits associated with a variable system delay is determined. The variable system delay is a time interval between each of a plurality of frames being encoded and decoded and is measured with respect to a current time for each of the plurality of frames. A number of bits in an encoder buffer for an encoder is determined. A number of bits in a decoder buffer for a decoder configured to receive encoded bits from the encoder is determined based on the bits associated with the variable system delay and the bits in the encoder buffer. Delivery of the encoded bits to the decoder is managed based on the number of bits determined to be in the decoder buffer.