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

• Date: 2022
• Main Authors: Kovalenko, Bogdan, Lukin, Volodymyr
• Format: Article
• Language: English
• Published: Scientific Centre for Aerospace Research of the Earth Institute of Geological Science National Academy of Sciences of Ukraine, Kyiv, Ukraine 2022
• Subjects: color image; lossy image compression; chroma subsampling; BPG coder; visual quality; YCbCr
• Online Access: https://ujrs.org.ua/ujrs/article/view/216
• Journal Title: Ukrainian Journal of Remote Sensing of the Earth

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.