合肥工业大学学报（自然科学版）
閤肥工業大學學報（自然科學版）
합비공업대학학보（자연과학판）
JOURNAL OF HEFEI UNIVERSITY OF TECHNOLOGY(NATURAL SCIENCE)
2014年
10期
1204-1209
,共6页
清晰度评价%非下采样Contourlet变换(NSCT)%显微图像%自动对焦
清晰度評價%非下採樣Contourlet變換(NSCT)%顯微圖像%自動對焦
청석도평개%비하채양Contourlet변환(NSCT)%현미도상%자동대초
image definition evaluation%non-subsampled contourlet transform (NSCT )%micro-image%auto-focus
针对显微图像噪声多、光照不均匀的特点，文章提出了一种基于NSCT 的显微图像清晰度评价算法。算法首先通过NSCT对图像进行分解，然后基于改进的拉普拉斯能量获取子带系数的能量，最终由低、高频子带系数能量的比值得到评价结果。实验结果表明，与拉普拉斯、方差及小波变换评价算法相比，该算法在保持高灵敏度的同时具有较好的抗噪性能，评价结果更为准确、稳定、可靠。
針對顯微圖像譟聲多、光照不均勻的特點，文章提齣瞭一種基于NSCT 的顯微圖像清晰度評價算法。算法首先通過NSCT對圖像進行分解，然後基于改進的拉普拉斯能量穫取子帶繫數的能量，最終由低、高頻子帶繫數能量的比值得到評價結果。實驗結果錶明，與拉普拉斯、方差及小波變換評價算法相比，該算法在保持高靈敏度的同時具有較好的抗譟性能，評價結果更為準確、穩定、可靠。
침대현미도상조성다、광조불균균적특점，문장제출료일충기우NSCT 적현미도상청석도평개산법。산법수선통과NSCT대도상진행분해，연후기우개진적랍보랍사능량획취자대계수적능량，최종유저、고빈자대계수능량적비치득도평개결과。실험결과표명，여랍보랍사、방차급소파변환평개산법상비，해산법재보지고령민도적동시구유교호적항조성능，평개결과경위준학、은정、가고。
According to the characteristics of image noise and uneven illumination in micro-image ,a new algorithm based on the non-subsampled contourlet transform(NSCT) is proposed for micro-image definition evaluation .Firstly ,the images are decomposed by NSCT .Then the energy of low-frequen-cy coefficients and high-frequency coefficients is obtained by sum-modified Laplacian method .Finally , the evaluation function is defined by the ratio of the energy of low-frequency coefficients and high-fre-quency coefficients .Ten sets of experimental results show that the new algorithm has better perform-ance of non-deflection , single peak value , sensitivity and anti-noise than variance , Laplacian and wavelet methods .The evaluation results obtained by the new algorithm are more accurate ,stable and reliable .
