解决大幅面CCD相机三色分离的方法

摘要

针对大幅面彩色电荷耦合器件(CCD)相机三通道色彩彼此分离的问题,深入研究了CCD的内部结构,分析了多线阵彩色CCD三色分离的原因,提出了一种将三通道数据分开缓存的修正方法,并制作了国内第一台高速多线阵CCD大幅面扫描仪.该修正方法根据多线阵彩色CCD内部工艺结构,将三通道数据在硬件上进行分开缓存、重组,实现真实色彩的还原.理论分析与实际应用效果表明:经过处理后的图像R、G、B三色分离现象得到极大改善,在1 200 DPI的分辨率下,三通道色彩未见分离.制作的大幅面扫描仪在600 DPI的分辨率下,扫描速度可达5.08 cm/s,扫描处理一张A0的图纸只需30 s的时间,图像拼接处像素误差在±2以内.%To correct the color separation of a large format CCD camera, this paper researches the internal structure of the CCD, analyzes the reasons of three color separation of multi-linear-array CCDs and proposes a new correction method to cache three-channel data separately. Then, it establishes the first high-speed tri-CCD large format scanner domestically. On the basis of the internal process structures of the tri-CCD, this correction method caches and restructures the three-channel data in hardware separately, and restores the true color. The theoretical analysis and practical application results show that three-color separation phenomenon has been greatly reformed after treated, and three-channel color is not separation in 1 200 DPI. In 600 DPI, the scan speed of the scanner produced by our team has been up to 5. 08 cm/s, and it only takes 30 s to scan a A0 size drawing. Furthermore, the splicing error of the image after scanning will be superior to +2 pixels。