CAJ | 학술논문

由于增益水平的不同，电子倍增电荷耦合器件图像所显现的图像内容不同，且图像动态范围极窄、对比度低、图像整体偏暗或模糊发白。为了提高微光图像动态范围及对比度，采用将不同增益水平的微光图像进行融合的算法，即先获取两组同场景但增益不同的微光图像，再对小波分解后的微光图像选择不同的融合规则，最后通过小波变换实现图像融合，得到了高质量的融合图像，并取得了融合图像的信息熵、标准差、平均梯度等性能指标数据。结果表明，该融合算法能使得融合后的图像同时包含低亮度景物和高亮度景物，达到了增大微光图像的动态范围及对比度的目的，有效改善了微光图像的质量。
유우증익수평적불동，전자배증전하우합기건도상소현현적도상내용불동，차도상동태범위겁착、대비도저、도상정체편암혹모호발백。위료제고미광도상동태범위급대비도，채용장불동증익수평적미광도상진행융합적산법，즉선획취량조동장경단증익불동적미광도상，재대소파분해후적미광도상선택불동적융합규칙，최후통과소파변환실현도상융합，득도료고질량적융합도상，병취득료융합도상적신식적、표준차、평균제도등성능지표수거。결과표명，해융합산법능사득융합후적도상동시포함저량도경물화고량도경물，체도료증대미광도상적동태범위급대비도적목적，유효개선료미광도상적질량。
Because of different gain , the image content displayed by the electron multiplying charge coupled device (EMCCD) was different and the image had low contrast and narrow dynamic range .Meanwhile, the overall image was dark, fuzzy and whitish .An image fusion algorithm based on wavelet transform was put forward to apply into low-light-level images with different gain levels .Firstly, two groups of low-light-level images were acquired in the same scene with different gain level.Secondly, proper fusion rules were chosen based on low-light-level image’s characteristics after wavelet transform.Finally, the images were fused by wavelet transform , high quality fusion image and the performance data of fusion image , such as entropy , standard deviation , average gradient were obtained .Results show that the fusion algorithm based on wavelet transform can make the fusion image with both low and high brightness scenery and enlarge the image ’ s dynamic range and contrast .The image quality is effectively improved .