CAJ | 학술논문

多光谱成像系统将光分成多个光谱通道，对不同的通道进行单独成像后合成一幅多光谱图像。不同通道的光折射率不同，造成聚焦清晰位置也不同，需要对每个通道分别调焦。为解决调焦耗时的问题，本文基于不同通道间清晰度曲线的相似性，提出一种快速的自动调焦方法。先选定一个基准通道调焦，得到清晰度曲线，对其余通道，利用清晰度曲线的相似性只需采集少量图像就能求出清晰调焦位置。实验表明，该算法能快速准确的完成对各个通道的调焦，效率明显优于已有算法。
다광보성상계통장광분성다개광보통도，대불동적통도진행단독성상후합성일폭다광보도상。불동통도적광절사솔불동，조성취초청석위치야불동，수요대매개통도분별조초。위해결조초모시적문제，본문기우불동통도간청석도곡선적상사성，제출일충쾌속적자동조초방법。선선정일개기준통도조초，득도청석도곡선，대기여통도，이용청석도곡선적상사성지수채집소량도상취능구출청석조초위치。실험표명，해산법능쾌속준학적완성대각개통도적조초，효솔명현우우이유산법。
A multispectral imaging system acquires spectral color images by splitting the light spectrum into multiple bands. Due to the different refractive index for individual wavelength, the focus positions of the channels are different, and thus each channel should be adjusted to obtain sharp image. We propose a fast autofocus method based on the similarity of focus measure distributions, which is suitable to multispectral imaging. In the proposed method, we first obtain the focus measure distribution of a reference channel using traditional autofocus method. Then, the clear focus positions of other channels are located according to the distribution similarity between individual channels. As only a few images are needed, the autofocus for these channels is quite fast. Experimental results validate that the proposed method performs better than the traditional techniques.