岩石薄片图像拼接中的色差校正算法-《计算机技术与发展》

文章信息/Info

Title:: Chromatic Aberration Correction Algorithm for Splicing of Rock Slice

作者:: 袁媛1 ; 滕奇志1 ; 何小海1 ; 张余强2; 1. 四川大学电子信息学院图像信息研究所,四川成都 610065;
2. 成都西图科技有限公司,四川成都 610065

Author(s):: YUAN Yuan 1 ; TENG Qi-zhi 1 ; HE Xiao-hai 1 ; ZHANG Yu-qiang 2; 1. Institute of Image Information,School of Electronics and Information Engineering,Sichuan University,Chengdu 610065,China;
2. Chengdu Xitu Technology Company Limited,Chengdu 610065,China

Keywords:: image color difference; Wallis filter; image registration; image stitching

摘要:: 在岩石薄片序列图像连续采集过程中,由于相机成像环境条件、岩石薄片自身性能等因素的限制,常常会出现序列图像间色彩亮度不一致的情况。此时,采用原始图像直接进行拼接后会出现许多含有色差的拼接“块”。针对这一问题,提出了对两幅图像重叠区域利用 Wallis 滤波器进行色差校正,使两幅图像的色彩亮度趋于一致,而对于多行多列的序列图像,采用类“王”字型调整顺序逐个利用 Wallis 滤波器进行校正,使其序列图像两两之间色彩亮度趋于一致。拼接后全薄片图像无明显色差,达到消除拼接结果图“块”效应的目的。实验结果表明,该算法能明显改善由于相机成像环境限
制等导致岩石序列图像色差不一致的问题,全薄片拼接结果图视觉效果佳,有利于岩石薄片的研究与保存。

Abstract:: In the process of continuous collection of rock flakes,the color difference between sequence images is often inconsistent due to the limitations of factors such as camera imaging environment and rock sheet’s own performance. At this time,a lot of stitching " block"will be appeared after splicing of original image directly. In order to solve this problem,we propose a color correction using Wallis filter for two overlapping regions,so that the color difference of the two images tends to be uniform. For the multi-sequence images,we adjust the order by using the " Wang" (Chinese character) and the color of the sequence images tends to be consistent. After splicing,the whole sheet image has no obvious color difference,to achieve the purpose of eliminating the stitching " block" . The experiment shows that the proposed algorithm can improve the color inconsistent of the rock sequence image due to the limitation of the camera imaging environment. The results of the whole sheet stitching are perfect for the research and preservation of the rock flakes.