Abstract:
An exemplary decoding method of an input video bitstream including a first bitstream and a second bitstream includes: decoding a first picture in the first bitstream; after a required decoded data derived from decoding the first picture is ready for a first decoding operation of a second picture in the first bitstream, performing the first decoding operation; and after a required decoded data derived from decoding the first picture is ready for a second decoding operation of a picture in the second bitstream, performing the second decoding operation, wherein The first bitstream contains pictures of a first view for a 3D video presentation, the second bitstream contains pictures of a second view for the 3D video presentation, and a time period of decoding the second picture in the first bitstream and a time period of decoding the picture in the second bitstream are overlapped in time.
Abstract:
A structure outputting a decoded video stream includes a processing block and a range modification circuit. The processing block decodes an input stream to generate and store a decoded stream in a decoded picture buffer, wherein the decoded stream comprises a luminance component and a chrominance component a decoded stream. The range modification circuit receives the decoded stream, and modifies, if required, a luminance range of the luminance component and a chrominance range of the chrominance component. The range modification circuit further outputs a video stream. The video stream comprises the modified luminance component when the luminance modification signal is true, and the video stream comprises the luminance component when the luminance modification is false. Similarly, the video stream comprises the modified chrominance component when the chrominance modification signal is true, and the video stream comprises the chrominance component when the chrominance modification signal is false.
Abstract:
A video decoding method for decoding a bit stream to a plurality of frames, includes: determining whether a size of a current picture is equal to that of a next picture according to the bit stream; scaling a corresponding reference frame for the next picture to generate a scaled frame when the size of the current picture is not equal to that of the next picture; and storing the scaled frame in a first frame buffer of a storage unit, wherein at least a portion of a first frame originally stored in the first frame buffer is displayed.
Abstract:
A video encoding system for encoding at least one frame, which includes a plurality of data units, to a bit stream. The system includes: a scaling unit, for scaling a data unit of a current frame to generate a scaled data unit in a first mode; and a video encoder, coupled to the scaling unit, for directly retrieving the scaled data unit from the scaling unit and encoding the scaled data unit to generate a coded data unit in the first mode.
Abstract:
For processing, e.g. encoding or decoding, a video stream, a type of a current macroblock unit is determined. The type indicates portions of corresponding macroblock parameter sets necessary for processing the current macroblock unit. The corresponding macroblock parameters are mapping to a dependent set of macroblock units of the current macroblock unit. The current macroblock unit is processed if a local buffer already stores the portions of the corresponding macroblock parameter sets. If data of the portions of the corresponding macroblock parameter sets that are not available in the local buffer, the data are copied from a memory circuit into the local buffer for processing the macroblock unit.
Abstract:
A progressively encoded image file, e.g. a JPEG bit stream, is decoded in multiple rounds. In first round, variable length encoded data in multiple scan segments of a first region are decoded. Meanwhile, position indicators for locating the next region are stored. In next round, the second region is decoded by reference to the position indicators for locating where the variable length encoded data of the second region are stored. The procedures are repeated until all regions are decoded to save memory usage during decoding.
Abstract:
A method for decoding a digital video sequence includes decoding a first picture in the sequence; reducing a data size of the decoded first picture by vector quantizing at least one component of the first picture, the quantized component selected from the luminance and chrominance components of the first picture; storing a reduced data size representation of the decoded first picture to a memory; reading a region of interest of the reduced data size representation of the decoded first picture; and decoding a region of interest of a second picture in the sequence according to the region of interest of the reduced data size representation of the decoded first picture.
Abstract:
A method for decoding pictures from a digital video bit-stream includes providing a first buffer and a second buffer being overlapped with the first buffer by an overlap region; decoding a first encoded picture from the bit-stream and storing a corresponding first picture into the first buffer; and decoding a second encoded picture from the bit-stream according to the first picture being stored in the first buffer, and storing a corresponding second picture into the second buffer. By overlapping the first buffer and the second buffer, overall buffer memory requirements when decoding the pictures are moderated.
Abstract:
An interpolation unit receives an incoming video bit stream comprising a plurality of frames including first macroblocks encoded using block-matching motion compensation and second macroblocks encoded using global motion compensation. A translation unit converts global motion parameters included in a current frame of the incoming video bit stream into a global motion vector. The interpolation unit performs luminance and chrominance interpolation operations on each macroblock contained in each frame of the incoming video bit stream. When processing a current macroblock, if the current macroblock is encoded using global motion compensation, the interpolation unit performs the luminance interpolation operations according to the global motion vector at half-pel resolution, and performs the chrominance interpolation operations at quarter-pel resolution. If the current macroblock is encoded using block-matching motion compensation, the interpolation unit performs the luminance and chrominance interpolation operations according to the macroblock motion vector contained in the current macroblock at half-pel resolution.
Abstract:
A video predictive decoding method and apparatus for predicting a current block of a picture. The method includes storing at least one previous product in a memory. The previous product corresponds to a block of a plurality of blocks of the picture. The previous product is the product of a quantized AC coefficient and a quantization scale of the block that the previous product corresponds to. The method further includes determining which block to use as a prediction block from the plurality of blocks, reading from the memory at least one previous product corresponding to the prediction block, and calculating at least one quantized AC coefficient of the current block using the at least one previous product read from the memory.