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人体掌形识别对掌形数据的准确性要求很高,这对数据采集电路的低噪声和准确性提出了更高要求。根据CCD图像传感器需复杂驱动时序和空间采样离散模拟信号输出的特点,采用FPGA做CCD时序驱动电路、用前置电路对CCD输出信号做后级处理。由DSP对CCD数据进行A/D采集后存储到外扩大容量SDRAM存储器中。由实际硬件电路测出的实验结果表明,系统的可靠性、稳定性很好。为掌形识别系统提供了准确的数据保证。
Human palm recognition requires high accuracy of the palm-shaped data, which puts higher demands on the low noise and accuracy of the data acquisition circuit. According to the characteristic that the CCD image sensor needs complex driving timing and spatial sampling discrete analog signal output, the CCD timing driver circuit is adopted as the CCD, and the CCD output signal is post-processed by the pre-circuit. A / D data collected by the DSP after the acquisition to the external memory capacity expansion SDRAM. The experimental results from the actual hardware circuit show that the reliability and stability of the system is very good. Accurate data assurance is provided for the palm recognition system.