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Scalable Direction Representation for Image Compression with Direction-Adaptive Discrete Wavelet Transform

机译:方向自适应离散小波变换的图像压缩可扩展方向表示

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摘要

The direction-adaptive discrete wavelet transform (DA-DWT) locally adapts the filtering direction to the geometric flow in the image. DA-DWT image coders have been shown to achieve a rate-distortion performance superior to non-adaptive wavelet coders. However, since the direction information must always be signalled regardless of total bit-rate, performance at very low bit-rates might be worse. In this paper, we propose two scalable direction representations: the layered scheme which is similar to the scalable motion vector representation in scalable video coding and the level-unit scheme which provides finer granularity upon the layered scheme. Experimental results indicate that we can achieve the desirable performance at both low and high bit rates with our proposed level-unit scheme. Significant improvement in image quality (about 3-5 dB) is observed at very low bit rate, relative to non-scalable coding of the direction information.
机译:方向自适应离散小波变换(DA-DWT)可以使滤波方向局部适应图像中的几何流。已经证明,DA-DWT图像编码器可实现优于非自适应小波编码器的速率失真性能。但是,由于无论总比特率如何,都必须始终用信号发送方向信息,因此在非常低的比特率下的性能可能会更差。在本文中,我们提出了两种可伸缩的方向表示形式:类似于可伸缩视频编码中的可伸缩运动矢量表示的分层方案和为分层方案提供更精细粒度的级别单位方案。实验结果表明,通过我们提出的电平单位方案,我们可以在低比特率和高比特率下都达到理想的性能。相对于方向信息的不可缩放编码,在非常低的比特率下可以观察到图像质量的显着改善(约3-5 dB)。

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