摘要:
Disclosed are motion estimation apparatus and method. The present invention can reduce an external memory access in an area in which a macroblock is large while preventing image quality from deteriorating due to motion estimation according to coding units, by obtaining a minimum motion vector using a prediction method in 64×64 and 32×32 modes for the coding units meeting a high efficiency video coding (HEVC) standard and obtaining a motion vector using a full search method in other modes.
摘要:
Provided is an adaptive motion search range determining apparatus and method for encoding UHD-class high-resolution images. The adaptive motion search range determining apparatus includes an MVD average/standard deviation calculation unit calculating an value average and a standard deviation of MVDs of neighboring macroblocks of a current macroblock, and a motion search range determination unit determining a motion search range of the current macroblock using the value average and the standard deviation. According to the adaptive motion search range determining apparatus, it is possible to enable each macroblock to have an adaptive search range by variably adjusting a motion vector search range of a current macroblock with reference to motion vectors of neighboring macroblocks of the current macroblock.
摘要:
Provided is an adaptive motion search range determining apparatus and method for encoding UHD-class high-resolution images. The adaptive motion search range determining apparatus includes an MVD average/standard deviation calculation unit calculating an value average and a standard deviation of MVDs of neighboring macroblocks of a current macroblock, and a motion search range determination unit determining a motion search range of the current macroblock using the value average and the standard deviation. According to the adaptive motion search range determining apparatus, it is possible to enable each macroblock to have an adaptive search range by variably adjusting a motion vector search range of a current macroblock with reference to motion vectors of neighboring macroblocks of the current macroblock.
摘要:
Disclosed is a motion estimation apparatus and method using a prediction algorithm between macroblocks. In the motion estimation method, an average of a motion vector of a macroblock 1 and a motion vector of a macroblock 3 is determined as a prediction motion vector. A prediction sum of absolute difference (SAD) value of the macroblock 2 is calculated, which is an SAD value based on the prediction motion vector. A reference SAD value for neighboring macroblocks of the macroblock 2 is compared with a value obtained by subtracting a predetermined threshold value from the prediction SAD value. Normal motion vector estimation is performed on the macroblock 2 based on the compared result.
摘要:
A caching apparatus for video motion estimation and compensation includes: an external memory including a plurality of banks and configured to allocate one pixel row to one bank to store the pixel row; a memory controller configured to cause successively-inputted read requests to access different banks of the external memory and transmit a read command for a next read request to the external memory while reference data corresponding to a first-coming read request is outputted; and a data processor configured to successively make read requests for the reference data to the memory controller when reference data read requests are successively inputted, store the reference data inputted from the memory controller, and output the stored reference data.
摘要:
Disclosed is a motion estimation apparatus and method capable of reduce a memory bandwidth by accessing reference image data occupying the largest part of the memory bandwidth based on a result of motion estimation skip determination. The motion estimation apparatus includes a motion estimation skip determination unit, a sum absolute of absolute difference (SAD) processing unit and a multiplexer (MUX) unit. The motion estimation skip determination unit determines the presence of motion estimation skip by reading current image data and skip reference image data, and outputs a motion vector in a skip mode. The SAD processing unit calculates an SAD value by reading the current image data and reference image data and outputs a motion vector in a normal mode. The MUX unit outputs the motion vector in the skip mode or the motion vector in the normal mode as a final motion vector based on a skip flag signal.
摘要:
A video decoding apparatus and method based on a data and function splitting scheme are disclosed. The video decoding apparatus based on a data and function splitting scheme includes a variable length decoding unit performing variable length decoding and parsing on a bit stream to acquire residual data and a decoding parameter, and splitting the residual data and the decoding parameter by row; and N (N is a natural number of 2 or larger) number of clusters splitting dequantization and inverse discrete cosine transform (IDCT), motion vector prediction, intra prediction and motion compensation, video restoration, and deblocking function into M number of functions, acquiring the residual data, the decoding parameter, and macroblock (MB) processing information of an upper cluster by column, and splitting the information acquired by column into M number of functions to process the same.
摘要:
There is provided a method and apparatus for accessing a memory according to a processor instruction. The apparatus includes: a stack offset extractor extracting an offset value from a stack pointer offset indicating a local variable in the processor instruction; a local stack storage including a plurality of items, each of which is formed of an activation bit indicating whether each item is activated, an offset storing an offset value of a stack pointer, and an element storing a local variable value of the stack pointer; an offset comparator comparing the extracted offset value with an offset value of each item and determining whether an item corresponding to the extracted offset value is present in the local stack storage; and a stack access controller controlling a processor to access the local stack storage or a cache memory according to a determining result of the offset comparator.
摘要:
Provided is a motion estimation apparatus for moving picture coding. The apparatus includes a 1-pel buffer for storing 1-pel unit pixels using luminance signals of a reference frame which correspond to macroblocks of a current frame, a 1-pel estimator for calculating 1-pel unit motion vectors and minimum costs in correspondence to the macroblocks of the current frame and the pixels stored in the 1-pel buffer, a ½-pel interpolator for performing ½-pel unit interpolation using the pixels stored in the 1-pel buffer, a ½-pel buffer for storing the ½-pel unit interpolated pixels, a ½-pel estimator for calculating ½-pel unit motion vectors and minimum costs in correspondence to the pixels stored in the ½-pel buffer, the values calculated by the 1-pel estimator, and the macroblocks of the current frame, a ¼-pel interpolator for performing ¼-pel unit interpolation using the pixels stored in the ½-pel and 1-pel buffers, a ¼-pel buffer for storing the ¼-pel unit interpolated pixels, and a ¼-pel estimator for calculating ¼-pel unit motion vectors and minimum costs in correspondence to the pixels stored in the ¼-pel buffer, the values calculated by the ½-pel estimator, and the macroblocks of the current frame.
摘要:
Provided is an H.264 Context Adaptive Variable Length Coding (CAVLC) decoding method based on an Application-Specific Instruction-set Processor (ASIP). The H.264 CAVLC decoding method includes determining a plurality of comparison bit strings on the basis of a table of a decoding coefficient, storing lengths of the comparison bit strings in a first register, storing code values of the comparison bit strings in a second register, comparing an input bit stream with the comparison bit strings based on the lengths and code values of the comparison bit strings, and determining value of the decoding coefficient according to a result of comparison between the input bit stream and the comparison bit strings. The method extracts a decoding coefficient using a register in an ASIP without accessing a memory and prevents a reduction in speed caused by memory access, thereby increasing the decoding speed of an H.264 decoder.