1. 暨南大学计算机科学系,广东,广州,510632
2. 暨南大学天体测量、动力学和空间科学研究中法联合实验室,广东,广州,510632
3. 暨南大学计算机科学系,广东,广州,510632
4. 暨南大学天体测量、动力学和空间科学研究中法联合实验室,广东,广州,510632
纸质出版:2015
移动端阅览
李展, 陈清亮, 彭青玉, 等. 基于MAP的单帧字符图像超分辨率重建[J]. 电子学报, 2015,43(1):191-197.
LI Zhan, CHEN Qing-liang, PENG Qing-yu, et al. MAP-Based Single-Frame Super-Resolution Reconstruction for Character Image[J]. Acta Electronica Sinica, 2015, 43(1): 191-197.
李展, 陈清亮, 彭青玉, 等. 基于MAP的单帧字符图像超分辨率重建[J]. 电子学报, 2015,43(1):191-197. DOI: 10.3969/j.issn.0372-2112.2015.01.030.
LI Zhan, CHEN Qing-liang, PENG Qing-yu, et al. MAP-Based Single-Frame Super-Resolution Reconstruction for Character Image[J]. Acta Electronica Sinica, 2015, 43(1): 191-197. DOI: 10.3969/j.issn.0372-2112.2015.01.030.
字符是很多图像处理应用关注的区域
增强字符图像分辨率往往能提高字符识别率.针对字符图像纵横和对角线方向纹理特征
提出了一种提取不同方向纹理及图像平滑度度量的新方法
并在最大后验概率框架下
实现了单帧图像超分辨率重建算法.算法利用自适应可调模板作为卷积核
将纹理信息引入图像先验模型
最终将超分辨率重建转化为一个目标函数最优化问题.实验表明
该算法能有效提高字符图像的识别率
且对噪声具有较好的鲁棒性.
Characters are concerned in many image processing applications.Enhance resolutions of character images frequently lead to higher recognition rate.Considering vertical
horizontal and diagonal texture features of character images
a new image smoothness measurement as well as a new method for extracting image texture in different directions is proposed
and a single-frame super-resolution (SR) reconstruction method is implemented under the maximum a posteriori (MAP) framework.Using a self-adaptive flexible template as a convolution kernel
texture information is introduced into the image prior model.Therefore
SR reconstruction is finally converted into an objective function optimization problem.Experimental results show that the proposed algorithm effectively increases the recognition rate for character images and has preferable robustness to noise.
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