基于FPGA的B超成像系统的设计

阐述了基于FPGA的B超成像系统的设计方案.该系统采用FPGA产生脉冲串,经过功率放大电路驱动超声波换能器,超声波经过探测后到达接收换能器,利用时间增益补偿电路对信号进行补偿,再用对数放大器TL441对回波信号进行检波放大,经过A/D转换到FPGA进行动态滤波,最后由FPGA控制信号在显示屏上显示输出.     

Low latency systolic multipliers for finite field GF（2m） based on irreducible polynomials

Systolic implementation of multiplication over GF(2 ^m ) is usually very efficient in area-time complexity, but its latency is usually very large. Thus, two low latency systolic multipliers over GF(2 ^m ) based on general irreducible polynomials and irreducible pentanomials are presented. First, a signal flow graph (SFG) is used to represent the algorithm for multiplication over GF(2 ^m ). Then, the two low latency systolic structures for multiplications over GF(2 ^m ) based on general irreducible polynomials and pentanomials are presented from the SFG by suitable cut-set retiming, respectively. Analysis indicates that the proposed two low latency designs involve at least one-third less area-delay product when compared with the existing designs. To the authors’ knowledge, the time-complexity of the structures is the lowest found in literature for systolic GF(2 ^m ) multipliers based on general irreducible polynomials and pentanomials. The proposed low latency designs are regular and modular, and therefore they are suitable for many time critical applications.     

基于MATLAB的静止图像车牌定位研究

提出了一种基于MATLAB的静止图像车牌定位的崭新方法。介绍了具体操作的原理和方法。通过对图像进行图像读取、图像处理、图像分割、图像定位标示等步骤的处理,最终获得静止图像中车牌的具体位置的标示。并进行验证得出这种方法是可行的。