摘要
为了提高推扫式航天遥感相机的动态范围,对TDI-CCD(Time Delay Integration-Charge Coupled Device)的全色谱段和多光谱谱段积分级数的特殊设置方法、相应图像的插值与融合方法进行研究。首先,介绍了常见的TDI-CCD的像元尺寸和谱段构成等参数,以及现有高分辨率多谱段融合图像的获取方法,分析了常规的积分级数设置规律。接着,提出在提高全色谱段的积分级数,降低多光谱谱段积分级数的情形下,分别获取各个谱段的灰度数据,为提高相机的动态范围提供原始数据。最后,针对性地提出了图像的融合、插值算法,可以得到高动态范围、高分辨率的全色图像。实验和计算结果表明:该方法能够有效提高相机的动态范围,当P谱段积分级数提高2倍,全色谱段降低为原来的1/4时,最终获取的融合图像动态范围可以提高18.06 dB。基本满足应用单排TDI CCD提高推扫式航天遥感相机动态范围的要求。
In order to increase the dynamic range of push-broom remote sensing cameras,we investigate the special setup of TDI stages of panchromatic and multispectral bands and study the interpolation method and the image fusion method of according images.Firstly,parameters,including common pixel size and bands of TDI CCD image sensors,and the present methods for obtaining high-resolution fused images are introduced.The traditional strategies for TDI stages′setup are analyzed.Secondly,raw data for high dynamic range(HDR)images are obtained by increasing the value of the panchromatic band′s TDI stages and decreasing the value of multispectral band′s TDI stages.Finally,the unique fusion and interpolation algorithm is proposed and high-dynamic-range and high-resolution gray images can be obtained.The calculation and experimental results indicate that this method can effectively improve the dynamic range of push-broom cameras.Meanwhile,the dynamic range of final fusion images can be improved by 18.06 dB when the TDI stages of the panchromatic band are multiplied by 2 and the TDI stages of multispectral bands are decreased by 1/4.The method proposed in this paper can successfully extend the dynamic range of push-broom remote sensing cameras.
作者
孙武
韩诚山
吕恒毅
薛旭成
胡长虹
SUN Wu;HAN Cheng-shan;LV Heng-yi;XUE Xu-cheng;HU Chang-hong(Changchun Institute of Optics,Fine Mechanics and Physics,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《中国光学》
EI
CAS
CSCD
北大核心
2019年第4期905-912,共8页
Chinese Optics
基金
吉林省自然科学基金资助项目(No.20150520059JH)~~
