摘要
提出了一种彩色逆半调色差预测及可视化评价方法.该方法从HVS特性着手,首先将图像变换到模式-颜色分离的S-CIELab空间,然后运用CIEDE2000色差公式和NBS色差感知参考值建立了彩色逆半调质量评价方案.仿真结果表明:该方法提高了色差计算的精度,拓展了色差表现形式,符合HVS特性,所生成的HVS色差图、色差分布、色差比率和色差均值能够直观、准确地反映半调噪声的抑制情况和重建图像质量.
A novel image quality assessment method for color inverse halftioning is proposed, in which DE2000 formula, the characteristics of HVS （human visual system） and the distribution of halftoning noise have been applied. The images are transformed to the S-CIELab space, and the color difference is calculated with DE2000 formula. Then the HVS threshold is selected from National Bureau of Standards UAS, and the series of consequences on HVS color difference for color inverse halftoning is obtained. The experimental results indicate that the new method has improved the precision, extended the presentation of color difference and accorded with the characteristics of HVS. The results of color diffence map and histogram can reflect the suppressing situation of halftoning noise, and the mean value and ratio over threshold can show the quality of color inverse halftoning directly.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2008年第8期21-23,共3页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家部委预研基金资助项目(51416050205DZ0144)
陕西省自然科学基金资助项目(2004F32)
陕西省教育厅专项科研计划资助项目(04JK244)
关键词
图像处理
半调
彩色逆半调
人眼视觉系统模型
图像质量评价
image processing
halftoning
color inverse halftoning
human visual system （HVS）
image quality assessment
