摘要:
An area of on-chip memory is allocated to store one or more tables of commonly-used opcodes. The normal opcode in the instruction is replaced with a shorter code identifying an index into the table. As a result, the instruction is compressed. For a VLIW architecture, in which an instruction includes multiple subinstructions (multiple opcodes), the instruction loading bandwidth is substantially reduced. Preferably, an opcode table is dynamically loaded. Different tasks are programmed with a respective table of opcodes to be stored in the opcode table. The respective table is loaded when task switching. A smaller, dynamic opcode table provides an effective selection and a low table loading overhead
摘要:
Intraoperative ultrasound (US) is integrated with stereotactic systems, where a system interactively registers two-dimensional (2D) US and three-dimensional (3D) magnetic resonance (MR) images. The registration is based on tracking a US probe with a bC magnetic position sensor. A transformation algorithm is performed to transform coordinates of points between two different spaces, where MR and US image spaces are independently registered with the position sensor space and where coordinate points can be registered between the MR and US spaces. A calibration procedure can be performed, and a phantom can be used to determine and analyze registration errors. The registered MR images can reconstructed using either zero-order or first-order interpolation.
摘要:
A template is analyzed to determine step sizes for searching within a search area. The template is analyzed by first padding the template with data points to increase its size. Cross-correlation between the padded template and the original template leads to identification of an effective step size along multiple axes. Step sizes for each of a horizontal, vertical and a third axis are derived. Third axis step sizes may correspond to rotation, scaling factor, subsampling factor, linear distance, time or frequency. Windows of the search area, selected based on the step sizes, then are tested in a fast search by correlating the template to selected windows to derive correlation coefficients. Any tested window which has a correlation coefficient exceeding a given value is a potential match for the template and is subject to a refined stage of comparison.
摘要:
An ultrasound system automatically measures fetal head size from ultrasound images. An ultrasound image of the fetal head is detected. A radial maxima point is identified on each of a plurality of radii extending from a substantially common vertex point within the fetal head image. Each radial maxima point corresponds to an ultrasound sample along its corresponding radius, and has a maximum ultrasound echo strength. Outlier points are removed and the curve filtered to derive an initial fetal head boundary. An inner fetal head boundary and outer fetal head boundary are derived from the initial fetal head boundary and a predetermined fetal skull thickness, and fetal head size is computed from the inner fetal head boundary and the outer fetal head boundary. Processing is allocated among multiprocessors and performed in pipeline fashion to enable real-time interactive imaging and measuring.
摘要:
A method and apparatus for defining, in a computing system, the bit size of an instruction to be executed by a processing unit. Instructions are realized in the form of a plurality of memory location devices. At least one of said memory location devices, in a predetermined position, is established as a MODE bit. The MODE bit assumes a first value indicative of parallel instruction execution and assumes a second value indicative of non-parallel instruction execution.
摘要:
An ultrasound system automatically measures fetal head size from ultrasound images. An ultrasound image of the fetal head is detected. A radial maxima point is identified on each of a plurality of radii extending from a substantially common vertex point within the fetal head image. Each radial maxima point corresponds to an ultrasound sample along its corresponding radius, and has a maximum ultrasound echo strength. A first curve is defined from the radial maxima points. The remaining unfiltered radial maxima points are fit to a second curve, and the second curve is the detected curved boundary. The detected curve boundary is modified to define an initial fetal head boundary. An inner fetal head boundary and outer fetal head boundary are derived from the initial fetal head boundary and a predetermined fetal skull thickness, and fetal head size is computed from the inner fetal head boundary and the outer fetal head boundary.
摘要:
A medical device is configured to diagnose whether a nodule of a bodily organ is malignant or benign using ultrasound elastography to determine a nodule stiffness index. Using either an external compression source or an in vivo pulsation source, the stiffness of the nodule of the bodily organ can be quantified by either its static properties or dynamic properties. The nodule can be classified as Type I, which is benign requiring further observation, or Type II, which is malignant requiring invasive procedures.
摘要:
A deep-pipeline system substantially reduces the overhead of setup delays and pipeline delays by dynamically controlling access of a plurality of configuration register sets by both a host central processing unit (CPU) and the stages of the pipelines. A master configuration register set is loaded with configuration parameters by the host CPU in response to an index count provided by a setup-index counter. A plurality of other counters are employed to track timing events in the system. In one embodiment, a run-index counter provides a run-index count to the first stage of the pipeline that is propagated along the stages, enabling configuration register sets to transfer configuration parameters to the stages of the pipeline when required to enable processing of a task. In an alternative embodiment, a plurality of D flip-flops sequentially propagates a state for successive registers, so that the setup-index counter is not required.
摘要:
A boundary macroblock of a video object is padded without significant synchronization overhead between a host processor and an existing coprocessor. The host processor determines horizontal and vertical graphics primitives as a function of shape data stored in a host memory. The shape data determine whether a dot, a line, or a rectangle primitive should be used to pad transparent pixels in the macroblock. The host processor communicates the primitives to a coprocessor, which renders the primitives in an interleaved pipeline fashion to pad transparent pixels of the macroblock based on texture data stored in video memory. The flow of primitives is in one direction from the host processor to the graphics coprocessor, and the texture data is not transferred back and forth between the host processor and coprocessor. This technique is especially useful for enabling acceleration of MPEG-4 video decoding utilizing existing coprocessors capable of accelerating MPEG-1/2 video decoding.
摘要:
A programmable graphics pipeline and method for processing multiple partitioned multimedia data, such as graphics data, image data, video data, or audio data. A preferred embodiment of the programmable graphics pipeline includes an instruction cache, a register file, and a vector functional unit that perform partitioned instructions. In addition, an enhanced rasterization unit is used to generate inverse-mapped source coordinates in addition to destination output coordinates for graphics and other media processing. An enhanced texture address unit generates corresponding memory addresses of source texture data for graphics processing and source media data for media processing. Data retrieved from memory are stored in an enhanced texture cache for use by the vector functional unit. A vector output unit includes a blending unit for graphics data and an output buffer for wide media data.