SLIM (slit lamp image mosaicing): handling reflection artifacts
SLIM (slit lamp image mosaicing): handling reflection artifacts
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DOI：
10.1007/s11548-017-1555-z
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发表时间：
2017-06-01
影响因子：
3
通讯作者：
Bartoli, Adrien
中科院分区：
文献类型：
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作者：
Prokopetc, Kristina;Bartoli, Adrien
裂隙灯是眼睛护理的重要仪器。它用于导航激光治疗和视网膜镶嵌，以辅助诊断。成像设置的细节引入了令人烦恼的照明伪影。它们不仅降低了马赛克的质量，而且还可能影响诊断。SLIM中的现有解决方案设法处理完全破坏视网膜内容的强烈眩光，同时撇开对非透明镜面高光和透镜眩光的校正。我们提出一种有效的技术来检测和校正SLIM中不同程度的光反射。我们依靠无反射图像的概念来获得无眩光图像，并使用它与上下文驱动的概率图相结合，在图像拼接之前，在每帧中分割视网膜的可见部分。然后，我们在所有空间对齐的帧的子集上执行图像混合。我们检测透镜光斑，并使用概率图将每个像素标记为“光斑”或“非光斑”。然后，我们调用适当的混合方法。我们还介绍了一种新的定量措施，为全球光度quality.We测试了一组视频序列，从裂隙灯检查会议的11个不同的病人提出健康和不健康的视网膜。对眩光和可见视网膜的分割进行了评估，并与最先进的方法进行了比较。实验结果表明，将该方法与SLIM算法相结合，可以显著提高拼接图像的整体光度质量，并优于已有的SLIM算法.
The slit lamp is an essential instrument for eye care. It is used in navigated laser treatment with retina mosaicing to assist diagnosis. Specifics of the imaging setup introduce bothersome illumination artifacts. They not only degrade the quality of the mosaic but may also affect the diagnosis. Existing solutions in SLIM manage to deal with strong glares which corrupt the retinal content entirely while leaving aside the correction of semitransparent specular highlights and lens flare. This introduces ghosting and information loss.We propose an effective technique to detect and correct light reflections of different degrees in SLIM. We rely on the specular-free image concept to obtain glare-free image and use it coupled with a contextually driven probability map to segment the visible part of the retina in every frame before image mosaicing. We then perform the image blending on a subset of all spatially aligned frames. We detect the lens flare and label each pixel as 'flare' or 'non flare' using a probability map. We then invoke an adequate blending method. We also introduce a new quantitative measure for global photometric quality.We tested on a set of video sequences obtained from slit lamp examination sessions of 11 different patients presenting healthy and unhealthy retinas. The segmentation of glare and visible retina was evaluated and compared to state-of-the-art methods. The correction of lens flare and semitransparent highlight with content-aware blending was applied and its performance was evaluated qualitatively and quantitatively.The experiments demonstrated that integrating the proposed method to the mosaicing framework significantly improves the global photometric quality of the mosaics and outperforms existing works in SLIM.