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:
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:
Provided are a network load reducing method and a node structure for a multiprocessor system with a distributed memory. The network load reducing method uses a multiprocessor system including a node having a distributed memory and an auxiliary memory storing a sharer history table. The network load reducing method includes recording the history of a sharer node in the sharer history table of the auxiliary memory, requesting share data with reference to the sharer history table of the auxiliary memory, and deleting share data stored in the distributed memory and updating the sharer history table of the auxiliary memory.
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:
Provided are an apparatus for decoding a minimum memory access-based context adaptive variable length code (CAVLC) of the moving picture compression standard, H.264, and a table search method for decoding a context adaptive variable length code using the same. The apparatus for decoding a context adaptive variable length code may be useful to improve an overall decoding speed since the repeated memory accesses may be reduced to 2 cycles of memory accesses by reconstructing a context adaptive variable length code table of first decoding information (TrailingOnes) and second decoding information (TotalCoefficient) into 2-step tables and storing the reconstructed 2-step tables in advance and performing a table search to decode the first decoding information and the second decoding information, by using the information stored in the 2-step tables, depending on whether the remaining bits except for the number of leading zero are present in the inputted bit stream.