| 摘要: |
| 针对不同加网类型和参数的彩色印刷图像,提出了一种基于加网参数和类型不确定的小波变换逆半调算法。 首先在 RGB 颜色空间中分离了颜色通道,选择了 B 样条小波作为小波变换基函数;然后对图像实施了二层小波分解,利用小波阈值去噪策略,去除了半色调网点噪声;最后对图像进行了小波重构,得到了逆半调图像。 实验结果表明,该逆半调算法适用于调频加网和调幅加网图像,同时逆半调图像具有很好的视觉效果。 |
| 关键词: 小波变换 逆半调 B 样条 小波阈值去噪 调频-调幅加网 |
| DOI： |
| 分类号:TS801. 3; TS807 |
| 基金项目:2011 年度湖南省大学生研究性学习和创新性实验计划项目(湘教通[2011]272 号);2011 年度湖南工业大学大学生研究性学习 和 创 新 性 实 验 计 划 项 目 ( 湖 工 大 教 字 [ 2011 ] 12 号); 2011 年 度 湖 南 工 业 大 学 自 然 科 学 研 究 项 目(2011HZX03);湖南省自然科学省市联合基金项目(12JJ9043) |
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| Research of Inverse Halftoning Based on Wavelet Transform for Indeterminacy Screening Parameters and Types |
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ZHOU Tao1, ZHONG Yun-fei1, FU Lu-jing2
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1.Hunan University of Technology, Zhuzhou 412007, China;2.Jiangnan University, Wuxi 214122, China
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| Abstract: |
| An inverse halftoning algorithm based on wavelet transform for indeterminacy screening parameters and types was proposed for color printing image of different types and parameters in screening. First, the color channels in RGB color space were separated and B-spline wavelet was selected as basis function in wavelet transform. Then, 2 layers wavelet decomposition was carried out on the images and the halftone noise was removed through wavelet threshold denoising strategy. Finally, the inverse halftoning image was obtained after wavelet reconstruction. The experimental results showed that the inverse halftoning algorithm is proper to frequency modulation ( FM) screening and amplitude modulation (AM) screening; meanwhile, it has better visual effect for inverse halftoning image. |
| Key words: wavelet transform inverse halftoning B-spline wavelet threshold denoising FM-AM screening |
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