| 基于JPEG2000的高动态范围图象压缩 |
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| 引用本文： | 王家亮,顾耀林.基于JPEG2000的高动态范围图象压缩[J].计算机工程与应用,2007,43(26):81-83. |
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| 作者姓名： | 王家亮 顾耀林 |
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| 作者单位： | 江南大学,信息工程学院,江苏,无锡,214122 |
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| 摘 要： | 高动态范围图象对真实场景的色阶和动态范围进行编码,如辐射度图。通过对JPEG2000编码器进行扩展,提出了一个高动态范围静态图象的压缩方法。该方法基于应用于高动态范围图象显示的色调映射技术,通过可变基底的对数映射函数对图象像素的32位浮点格式的辐射度值进行变换,然后将数据输入到JPEG2000编码器,并依据HVS模型的对比灵敏度特性对小波系数进行加权处理。实验显示,该方法对图象有较大压缩率的同时还保持较好的主观质量。
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| 关 键 词： | 图象压缩 JPEG2000 高动态范围图象 小波变换 对比灵敏度函数 |
| 文章编号： | 1002-8331（2007）26-0081-03 |
| 修稿时间： | 2007-01 |
High-dynamic range image compression based on JPEG2000 |
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| WANG Jia-liang,GU Yao-lin.High-dynamic range image compression based on JPEG2000[J].Computer Engineering and Applications,2007,43(26):81-83. |
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| Authors: | WANG Jia-liang GU Yao-lin |
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| Affiliation: | School of Information Engineering, Jiangnan University, Wuxi, Jiangsu 214122, China |
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| Abstract: | High-dynamic image files encode the color gamut and dynamic range of the original scene.A compression method is proposed for high-dynamic still images by extending JPEG2000 encoder.Based on tone mapping,a logarithmic mapping transformed three 32-float pixels to three 16-bit integer data,then the data is fed to JPEG2000 encoder.And it weights the wavelet coefficients by CSF masks.The result shows that the scheme has a high coding efficiency,while improving subjective quality. |
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| Keywords: | image compression JPEG2000 HDR image wavelet transformation CSF |
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