海洋颜色八通道多光谱成像测量研究

Measuring sea color with eight-channel spectral imaging

海洋颜色等光学数据随空间变化很大,为了解决卫星遥测海洋光谱成像数据校正和光谱分析仪无法进行海洋表观特征成像测量的问题,依据窄带光学成像原理研制的海洋多光谱成像仪具有8个窄带光学通道,可同步成像测量.同时结合利用光谱比较测色法和三次样条插值光谱重建等技术研制的多光谱图像数据采集、处理和分析软件,对东海南部典型海域进行了实景测量,取得的数据填补了我国该领域的空白.该设备体积小、重量轻,便于进行海洋表面大范围、多视角表观颜色、光谱特征成像测量.海上实测数据表明,位于我国东海南部的各测量海域,不同测量海域之间的海水最大色差达到了14.89,表观颜色差异明显;其海水光谱反射率曲线和变化趋势相差也较大.

The sea＇s color and optical properties often vary hugely with changing sea zones. Remote spectral sea images captured by satellites need to be analyzed by hand because current optical analysis instruments cant accurately evaluate features of the sea from the image＇s appearance. To resolve this, an eight-channel spectral imaging instrument was made, based on the narrow band multiehannel imaging principle. It has eight optical channels, each capturing a spectral slice of each image. Multispectral imaging software to collect, manipulate and analyse data was then developed to complement the hardware. The software used the comparative color measurement method and the cubic spline spectral reconstruction method. In the southern part of the East China Sea, the sea color and spectral reflectivity were measured with this instrument and software. The measurement results fill a void in optical ocean research. While physically small and light weight, the instrument accurately measures the sea＇s color, spectral reflectivity and other image features, and can do so for large areas, and with a wide angle of view. The results showed maximum chromatic aberration of 14.89 between measured sea zones. Although these sea zones lie in one area, differences in sea color and spectral reflectivity between zones were significant.