Usage of different Chroma Subsampling Modes in Image Compression by BPG Coder

Authors

DOI:

https://doi.org/10.36023/ujrs.2022.9.3.216

Keywords:

color image, lossy image compression, chroma subsampling, BPG coder, visual quality, YCbCr

Abstract

A BPG (better portable graphics) coder is a novel approach that aims to replace common standards of compression such as JPEG, JPEG2000 and so on. That is why, the BPG coder needs a detailed analysis of its basic characteristics from the viewpoint of visual quality and compression ratio. The BPG coder can use different modes of chroma subsampling for color and three-channel images and it is worth analyzing and comparing them. In practice, images to be compressed are often noisy. Then, lossy compression of such images has a specific noise filtering effect. In particular, optimal operation point (OOP) might exist where compressed image quality is closer to the corresponding noise-free (true) image than uncompressed (original, noisy) image quality according to certain criterion (metric). It is also needed to analyze the coder performance from compression ratio point of view. In this paper, we pay attention on impact of different chroma subsampling modes on image quality and compression ratio. Based on simulation results obtained for a set of color images, the best possible ways of compression are recommended.

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Published

2022-09-28

Issue

Vol. 9 No. 3 (2022)

Section

Techniques for Earth observation data acquisition, processing and interpretation

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