彩色图像实时采集的硬件设计

本文分析了不同图像信号源的特点，提出了彩色图像数据采集的硬件设计方案。论述了数字化参数的选择原则。较详细地分析了所设计的两种锁相环电路：以彩色同步为基准的单片锁相环和以行频ｆＨ 为基准的锁相环。两种锁相环产生的时钟信号分别适合于标准信号和非标准信号。最后简述了帧存贮体和接口设计。本文提出的实时采集方案具有硬件少、软件简单、调试容易等优点

Hardware design of the real-time acquisition for a color image

The characteristic of various image signal source is analysed. A hardware design scheme of color image acquisition is proposed. The parameter selection for color image digitalization is discussed. we have disigned two PLL circuit: clock generation from color subcarrier signal (PLL 1) and clock generation from horizontal synchronized signal (PLL 2). The PLL 1 is used for processing of standard color TV signal, PLL 2 is for non standard image signal. Finally the disign of a frame memory and an interface are discussed simply. The real time acquisition scheme is characterized by simplified hardware, only a few software, easy adjust and test, and low cost.