从结构设计和方法优化入手, 提出了基于双SRAM缓存结构并采用乒乓读写原理的CMOS图像传感器逐行转隔行数据缓存方法。该方法采用两组SRAM作为缓存, 并利用乒乓读写原理, 抽取逐行数据中奇数帧周期的奇数行作为隔行数据的奇数场, 抽取逐行数据中偶数帧周期的偶数行作为隔行数据的偶数场, 最终实现CMOS图像传感器逐行数据到奇偶隔行数据的转换。相比传统的采用片外帧存储处理方式, 极大地减小了存储面积, 便于实现与CMOS图像传感器的单芯片集成, 降低了成本, 同时也极大地降低了电路工作时的存储读写功耗。

Starting with structure design and method optimization, a data caching method integrated in CMOS image sensor for progressive to interlace conversion based on dual SRAM cache structure and principles of ping-pong read-write was proposed. In this method, two sets of SRAM were adopted as buffer, and ping-pong read-write method was used for data operation. In data processing, the odd lines from odd frames of progressive data are extracted as the odd field of interlace data, and the even lines from even frames of progressive data are extracted as the even field of interlace data, thus ultimately the data conversion from progressive to parity interlace is completed. Compared to the traditional data cache approach based on frame-memory outside chip, the proposed method makes it easier to integrate all parts within a single CMOS image sensor chip, while greatly reducing not only the storage area and costs, but also the circuit power of memory read-write.