基于多区间映射评价优选的光谱数据融合显示算法

Fusion and vision algorithm of spectral data based on mappingevaluating-optimizing methods within multi-section

研究降维、去冗后光谱数据色彩显示问题。传统的光谱数据色彩显示时,常采用截取或压缩至0~1范围进行映射,容易丢失图像细节,提出一种基于多区间平移映射评价优选方法的光谱数据色彩融合显示算法。首先对光谱数据立方体进行主成份变换,将前三成分分别赋值给对色空间的黑白通道、红绿通道和黄蓝通道,然后经过空间变换到sRGB空间,将数据分段平移到0~1范围,映射至8位RGB空间,并对每次平移映射图像进行标准差、熵、平均梯度的单项评价,全部平移结束后,对所有的评价值进行综合评价,选取综合评价值最高的区间输出映射。实验结果表明,融合图像能最大限度地保证图像的能量、信息和清晰度,有利于人眼的快速识别判断。

Color vision of spectral data after reducing dimension and redundancy was researched.The traditional mapping method,cutting or compressing data into the range between 0and 1,can always lead to loss of the fusion image details.A novel fusion and vision algorithm of spectral data was presented,based on the shifting-mapping-evaluating-optimizing way within multisection.The first 3principal component values were achieved by principal component transform(PCT)of the spectral data cube,and assigned respectively to white-black,red-green and yellow-blue channels of opponent color space.The values of standard red-green-blue(sRGB)color space were transformed from opponent color space,and the sRGB values were divided into several sections,moved to the range of 0to 1and mapped to 8-bit RGB digital code values.The single item evaluations of standard deviation,entropy,average gradient were calculated from 8-bit RGB.The comprehensive evaluation values were got from all of the single item evaluation after finishing the process of moving,mapping and single item evaluation.The fusion image was mapped at the section with maximum comprehensive evaluation.The results show that the fusion image can ensure the image's energy,information and definition,which is useful for manual distinguish and judge rapidly.