基于人工靶标的多光谱遥感图像真彩色合成

Multi-spectral remote sensing image true color synthesis technique based on artificial target

多光谱真彩色合成图像在遥感图像解译判读、目标识别和信息处理等领域具有广阔的应用前景。真彩色合成技术取决于获得准确的X、Y、Z三刺激值,以建立相机RGB三基色体系与人眼视觉颜色体系之间的关系。为此,提出了基于彩色目标光谱信息的多光谱图像真彩色合成方法,通过在卫星过顶时铺设人工靶标,利用实测的靶标反射率光谱,计算相机三基色体系RGB与人眼视觉颜色体系CIEXYZ之间的转换矩阵,构建适用于一定大气条件下的真彩色校正模型。利用高分一号卫星多光谱图像进行真彩色校正实验的结果表明,该方法对色彩丰富度不同的图像均具有较好的颜色校正效果。

Multi-spectral true color synthesized images have the prospects of broad application in the interpretation of remote sensing image, target recognition and information processing etc. The technique of true color synthesis depends on the accuracy of the obtained tristimulus values CIE-XYZ, which is used to establish the right relationship between the system of camera＇s RGB and human being＇s visual color. So, a method of true color image synthesis based on the information of artificial target was proposed by laying the man-made targets when the satellite passes. And, the transformation matrix between camera＇s RGB trichromatic system and human being＇s visual color system was estimated from the reflectance spectrum of man-made targets. Eventually, the suitable true color correction model was established in the certain atmospheric conditions. Experiment of true color correction was conducted on the multi-spectral images of GF-1 satellite, and the results show that good color correction effects has been exhibited on even every image with different degrees of color＇s richness.