皮肤镜图像散焦模糊与光照不均混叠时的无参考质量评价

卢亚楠; 谢凤英; 周世新; 姜志国; 孟如松

doi:10.3724/SP.J.1004.2014.00480

皮肤镜图像散焦模糊与光照不均混叠时的无参考质量评价

doi: 10.3724/SP.J.1004.2014.00480

1.
北京航空航天大学宇航学院图像处理中心北京 100191;
2.
内蒙古兴安职业技术学院乌兰浩特 137400;
3.
中国人民解放军空军总医院皮肤科北京 100142

基金项目:

国家自然科学基金（61027004，61071138），北航重点培育基金（YWF-12-LXGY-013）资助

详细信息

作者简介:
卢亚楠北京航空航天大学宇航学院博士研究生. 2011 年获得北京航空航天大学宇航学院学士学位. 主要研究方向为图像质量评价.E-mail：yn_lu@sa.buaa.edu.cn

通讯作者:
谢凤英

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出版历程
- 收稿日期: 2012-10-25
- 修回日期: 2013-08-19
- 刊出日期: 2014-03-20

Non-reference Quality Assessment of Dermoscopy Images with Defocus Blur and Uneven Illumination Distortion

1.
Image Processing Center of Beihang University, Beijing 100191;
2.
Xing An Vocational and Technical College, Ulan Hot 137400;
3.
General Hospital of the Air Force, PLA, Beijing 100142

Funds:

Supported by National Natural Science Foundation of China (61027004, 61071138), and the Science Foundation of Beihang University (YWF-12-LXGY-013)

摘要

摘要: 皮肤镜图像的采集质量直接影响后续的分析诊断结果.针对皮肤镜图像在采集过程中可能出现的散焦模糊和光照不均两种类型的失真，提出了一种有效的无参考图像质量评价算法. 通过频率特性分析我们发现，散焦模糊主要影响离散余弦变换（Discrete cosine transform，DCT）后的直流分量，而光照不均则主要影响第一交流分量.针对该特性，论文在频率域设计质量评价模型，首先将散焦模糊与光照不均两种失真成功分离，进而分别计算失真程度，给出评价指标.实验结果表明，本文提出的算法既可以对散焦模糊或光照不均单一失真类型的皮肤镜图像进行质量评价，也可以对两种失真类型同时存在的复杂皮肤图像进行评价，给出的评价结果稳定客观、互相独立，且与主观评价结果相一致.
- 皮肤镜图像 /
- 图像质量评价 /
- 散焦模糊 /
- 光照不均 /
- 离散余弦变换
Abstract: The quality of dermoscopy images will impact the subsequent segmentation and analysis results. An efficient non-reference image quality assessment algorithm is proposed when defocus blur exists in an image with uneven illumination. The discrete cosine transform (DCT) is carried out and the frequency characteristic is deeply analyzed for dermoscopy images. It is found that defocus blur mainly affects the direct current (DC) component while uneven illumination mainly affects the first alternating current (AC) component. According to this finding, a quality assessment model is proposed in the frequency domain. Defocus blur signal is successfully separated from uneven illumination signal firstly, and then two metrics respectively for defocus blur and uneven illumination signals are calculated. Experiment results show that the proposed metrics can not only evaluate dermoscopy images with the single type of distortion caused by either defocus blur or uneven illumination, but also evaluate the ones with both of them at the same time. The evaluation results are stable, objective, independent, and consistent with the subjective evaluation results.
- Dermoscopy image /
- image quality assessment /
- defocus blur /
- uneven illumination /
- discrete cosine transform (DCT)

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参考文献(15)

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皮肤镜图像散焦模糊与光照不均混叠时的无参考质量评价

doi: 10.3724/SP.J.1004.2014.00480

作者简介:
卢亚楠北京航空航天大学宇航学院博士研究生. 2011 年获得北京航空航天大学宇航学院学士学位. 主要研究方向为图像质量评价.E-mail：yn_lu@sa.buaa.edu.cn

通讯作者:
谢凤英

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Non-reference Quality Assessment of Dermoscopy Images with Defocus Blur and Uneven Illumination Distortion

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留言板

皮肤镜图像散焦模糊与光照不均混叠时的无参考质量评价

doi: 10.3724/SP.J.1004.2014.00480

作者简介: 卢亚楠 北京航空航天大学宇航学院博士研究生. 2011 年获得北京航空航天大学宇航学院学士学位. 主要研究方向为图像质量评价.E-mail：yn_lu@sa.buaa.edu.cn

通讯作者: 谢凤英

计量

出版历程

Non-reference Quality Assessment of Dermoscopy Images with Defocus Blur and Uneven Illumination Distortion

计量

出版历程

目录

作者简介:
卢亚楠北京航空航天大学宇航学院博士研究生. 2011 年获得北京航空航天大学宇航学院学士学位. 主要研究方向为图像质量评价.E-mail：yn_lu@sa.buaa.edu.cn

通讯作者:
谢凤英