遥感图像光照一致性定量评价

Quantitative assessment for illumination homogeneity of remote-sensing images

高分辨率图像比对法是图像质量评价中简单而又行之有效的方法，其前提是两幅用于比较的高低分辨率图像具有良好的一致性，但实际情况往往很难满足这些一致性要求。为了使不能满足光照一致性的图像也能用于卫星在轨参数监测，需要进行光照一致性校正。针对如何定量评价多幅遥感图像的光照一致性问题，提出了一种定量评价方法。该方法根据Retinex原理，将图像分解为光照分量和反射分量，然后比较光照分量直方图的相似度，将这一相似度约束在0～1之间，称为光照一致性系数。实验结果表明，这种方法评价的结果与主观感受相一致，能够量化图像的光照一致性。

Comparison of high resolution images is a simple and effective method for image quality assessment on condition that the two high resolution images to be compared have a good state of homogeneity.However,in reality it is hard to meet the requirements.Thus illumination homogeneity correction is necessary to make the images that do not meet the demands able to satellite parameters.To quantitatively assess the illumination homogeneity of multiple remote-sensing images,the paper presen-ted a new method.According to Retinex theory,the method decomposed images into illumination and reflection.Then it compu-ted the similarity of the illumination histograms and normalized the similarity between 0 and 1 ,which was called as illumination homogeneity parameter.Experimental results demonstrate that the quantitative assessment is consistent with subjective experi-ence and can quantify the illumination homogeneity of images.