CAJ | 학술논문

为了分析光学相干层析成像技术（ OCT）的图像对数变换前后的斑点噪声分布模型，为图像去噪及其它图像处理过程提供参考，采用了先推导斑点噪声理论分布模型，再通过实验数据验证的方法。首先分析了对数变换前斑点噪声的统计特性，利用数学理论推导得到斑点噪声对数变换后的理论分布模型，然后用OCT心血管图像的平滑区域作为噪声的试验数据，得到变换前后斑点噪声的直方图分布数据，最后用理论分布模型对试验数据进行曲线拟合，取得了确定系数、均方根差和卡方检测的评价数据。结果表明，对数变换后斑点噪声分布符合Fisher-Tippett分布。这一结果对OCT图像去噪等处理过程是有帮助的。
위료분석광학상간층석성상기술（ OCT）적도상대수변환전후적반점조성분포모형，위도상거조급기타도상처리과정제공삼고，채용료선추도반점조성이론분포모형，재통과실험수거험증적방법。수선분석료대수변환전반점조성적통계특성，이용수학이론추도득도반점조성대수변환후적이론분포모형，연후용OCT심혈관도상적평활구역작위조성적시험수거，득도변환전후반점조성적직방도분포수거，최후용이론분포모형대시험수거진행곡선의합，취득료학정계수、균방근차화잡방검측적평개수거。결과표명，대수변환후반점조성분포부합Fisher-Tippett분포。저일결과대OCT도상거조등처리과정시유방조적。
In order to analyze the speckle noise distribution model of optical coherence tomography ( OCT ) images before and after logarithm transformation and provide references for image de-noising and other image processing , theoretical distribution model of the speckle noise was deduced firstly and then was verified by experimental results .First of all, the statistical properties of the speckle noise before the logarithm transformation were analyzed .The distribution model of the speckle noise after logarithm transform was derived through the mathematical theory .Then, the smooth regions of cardiovascular OCT images were selected as the experimental data to obtain the histogram distribution of the speckle noise before and after the logarithm transformation .Finally, the experimental data were fitted by the theoretical distribution model and the evaluated data, such as R-square, root mean square error and X-square tests.The results prove that the noise distribution after logarithm transformation presents Fisher-Tippett distribution .The results are helpful for the de-noising on OCT images.