自动化学报Issue(3)：480-488,9.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
Non-reference Quality Assessment of Dermoscopy Images with Defocus Blur and Uneven Illumination Distortion
摘要
Abstract
The quality of dermoscopy images will impact the subsequent segmentation and analysis results. An effi-cient 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 illumi-nation 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.关键词
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Key words
Dermoscopy image/image quality assessment/defocus blur/uneven illumination/discrete cosine transform (DCT)引用本文复制引用
卢亚楠,谢凤英,周世新,姜志国,孟如松..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[J].自动化学报,2014,(3):480-488,9.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@@@@Supported by National Natural Science Foundation of China (61027004,61071138), and the Science Foundation of Beihang University (YWF-12-LXGY-013) （61027004,61071138）
