Subband Lossy and Lossless Coding

子带有损和无损编码

• 批准号: 11650393
• 负责人: TAKAHASHI Shinichi
• 金额: $ 1.92万
• 依托单位: Keio University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650393/
• 关键词: Subband; Lossy; Lossless; Coding; サブバンド符号化; ウェーブレット変換; 全域通過回路; 可逆符号化; 非可逆符号化

We proposed two method for lossy and lossless image coding. One is based on wavelet transform which is implemented by two-channel IIR filter banks consisted of the parallel connection of allpass filters. This structure is very simple and less computational complexity, but the parameters for each mode are individual each other to get good performance. Another is based on lapped biorthogonal transform which is consisted of integer DCT and lifting steps to overcome the problem as mentioned above. By this method. Both lossy and lossless codings are implemented by the same structure or software. This is called reversible transform and is based on lossless mode. Lossy mode is realized by cutting bit stream. Taking consideration with the transfer function of lifting step, the length of bases function on each subband is variable. The blocking artifacts of which causes in DCT are reduced by making the length of lowpass filter long in the synthesis bank. Ringing artifacts are also reduced by making the length of bandpass and high pass filters short. Computer simulations show that the proposed method is compatible with the conventiona method in lossy mode and is sometimes much better than the conventional method in lossless mode.

提出了有损和无损两种图像编码方法。一种是基于小波变换，由全通滤波器并联组成的双通道IIR滤波器组实现。该结构结构简单，计算量小，但各模态参数相互独立，从而获得较好的性能。另一种方法是基于由整数DCT和提升步骤组成的叠置双正交变换来克服上述问题。用这种方法。有损编码和无损编码都是由相同的结构或软件实现的。这被称为可逆变换，是基于无损模式的。有损模式是通过切断比特流来实现的。考虑提升阶跃的传递函数，各子带上基函数的长度是可变的。通过在合成库中增加低通滤波器的长度，减少了DCT中产生的阻塞伪影。通过缩短带通和高通滤波器的长度，还可以减少振铃伪影。计算机仿真结果表明，该方法在有损模式下与传统方法兼容，有时甚至比传统方法在无损模式下要好得多。

项目成果

T.Uto, M.Ikehara, S.Takahashi: "Image Coding Using Wavelets Based on Two-channel IIR Filter Banks"IEEE Int.Cont. on Image Processing. (1999)

T.Uto、M.Ikehara、S.Takahashi：“使用基于两通道 IIR 滤波器组的小波进行图像编码”IEEE Int.Cont。

Yutaka Kohno: "Lossless Coding using IIR Filter Banks"ISPACS1999. 37-40 (1999)

Yutaka Kohno：“使用 IIR 滤波器组进行无损编码”ISPACS1999。

Tashiyuki UTO: "Image Coding Using Wavelets Based on Two-channel Linear Phase Orthogonal IIR Filter Banks"IEEE International Conference on Image Processing. Vol2. 265-268 (1999)

Tashiyuki UTO：“基于两通道线性相位正交 IIR 滤波器组的使用小波的图像编码”IEEE 国际图像处理会议。

川田昌宏: "重複直交変換を用いた可逆・非可逆統一画像符号化"電子情報通信学会技術研究報告(DSP). 3月(発表予定). (2001)

Masahiro Kawada：“使用重叠正交变换的可逆和不可逆统一图像编码”IEICE 技术报告（DSP）（2001 年）。

"A Reversible Image Coding using Lapped Biorthogonal Transforms"IEICE Technical Report(DSP). (To be published). (2001)

“使用重叠双正交变换的可逆图像编码”IEICE 技术报告（DSP）。