CAJ | 학술논문

色调映射是一种适用于亮度和对比度变化的快速图像匹配方法。由于异源图像间存在复杂的灰度变换关系，直接采用色调映射方法进行匹配的成功率通常难以满足应用需求。为了提高匹配成功率，本文提出基于子区弱切片变换的局部色调映射异源图像匹配方法。首先将实时图划分为不重叠的子区，对每个子区进行直方图均衡化和弱切片变换，通过局部色调映射计算子区与基准图的距离系数图。融合全部距离系数图得到图像匹配结果。实验结果表明，该方法匹配成功率高于现有的色调映射方法，且计算时间仅略高于现有方法，优于异源图像匹配中常用的互信息方法。
색조영사시일충괄용우량도화대비도변화적쾌속도상필배방법。유우이원도상간존재복잡적회도변환관계，직접채용색조영사방법진행필배적성공솔통상난이만족응용수구。위료제고필배성공솔，본문제출기우자구약절편변환적국부색조영사이원도상필배방법。수선장실시도화분위불중첩적자구，대매개자구진행직방도균형화화약절편변환，통과국부색조영사계산자구여기준도적거리계수도。융합전부거리계수도득도도상필배결과。실험결과표명，해방법필배성공솔고우현유적색조영사방법，차계산시간부략고우현유방법，우우이원도상필배중상용적호신식방법。
Tone mapping is an efficient image matching algorithm adaptive to brightness and contrast variation.Due to the complex and nonconforming relation between multi-sensor images,tone mapping can hardly be directly used on multi-sensor images to achieve satisfactory results.To improve the matching rate,the local tone mapping algorithm is proposed,which includes the following steps:Firstly,the template map is divided into nonoverlapping blocks.,Then,each block is processed through histogram equalization and weak slice transform.Next,the distance maps are calculated for every block by local tone mapping.Finally,the matching result is obtained by fusion all these distance maps.Experimental results show that,the matching rate of local tone mapping significantly outperforms tone mapping and mutual information,while its computation time is slightly longer than that of the tone mapping and less than that of the mutual information.