JPEG 2000学习笔记(1)

最新推荐文章于 2025-06-28 09:10:21 发布

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最新推荐文章于 2025-06-28 09:10:21 发布 · 751 阅读

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#jpeg图像压缩 #JPEG2000 #编解码

本文是JPEG 2000的学习笔记，介绍了JPEG 2000编码流程，包括组件和瓦片分离、小波变换、量化、分块编码等步骤。与JPEG的主要区别在于使用了小波而非DCT变换，分区在小波域进行，避免了块效应，并采用位平面编码实现码流可截断性，实现了质量与速率的平滑退化。

JPEG 2000学习笔记（1）

本文为学习笔记，内容取自JPEG 2000的相关论文。

Overview of JPEG 2000

The operation flow of a typical JPEG 2000 encoder is shown in Figure 1.
这里写图片描述
Figure 1. Flowchart for JPEG 2000 Encoder

The encoder starts with a component and tile separation module. After this preprocessing, it applies a wavelet transform which yields a sequence of wavelet coefficients. The encoder next quantizes the wavelet coefficients which are regrouped to facilitate localized spatial and resolution access. The degrees off resolution are organized into subbands, which are divided into non-overlapping rectangular blocks. Three spatially co-located rectang