计算机工程与应用 ›› 2007, Vol. 43 ›› Issue (26): 81-83.

• 学术探讨 • 上一篇    下一篇

基于JPEG2000的高动态范围图象压缩

王家亮,顾耀林   

  1. 江南大学 信息工程学院,江苏 无锡 214122
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-09-11 发布日期:2007-09-11
  • 通讯作者: 王家亮

High-dynamic range image compression based on JPEG2000

WANG Jia-liang,GU Yao-lin   

  1. School of Information Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-09-11 Published:2007-09-11
  • Contact: WANG Jia-liang

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。

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

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.

Key words: image compression, JPEG2000, HDR image, wavelet transformation, CSF