高速彩色线阵CCD三色错位修正方法的研究

Correction of high-speed tri-CCD color disorder

为了改善图像采集的质量,通过分析高速彩色线阵CCD三色错位产生的机理,提出了三色错位的几种修正方法:棱镜分光法、异步时钟控制曝光法、通过软件修正法。采用棱镜分光可以实现对红色、绿色和蓝色分量同时感光,避免颜色错位;改变现有CCD外围电路,通过异步时钟控制曝光,即调整CCD曝光的先后次序和延迟时间,实现错位修正;基于数据冗余与数据重新定位技术,通过软件达到实时修正色彩错位的目的。该方法以BASLERL301bc彩色线阵CCD摄像机为例得到验证,图像质量改善显著。

In order to improve the quality of image acquired, the causes of high-speed tri-CCD color disorder were analyzed, and several approaches including prismatic decomposition, exposure controlled by asynchronous trigger clock, and correction by software, are suggested for correction of high-speed tri-CCD color disorder. A prism splitter can be used to enable tri-CCD to receive red, green and blue beams separately so that color disorder can be avoided. An asynchronous clock can be used to control the exposures so that the sequence and delay of tri-CCD exposures can be adjusted to avoid color disorder. Real-time correction of color disorder can be achieved through software modification using data redundancy and data relocation technology. Substantiations made with a BASLER L301bc tri-CCD showed that the quality of images was significantly improved.