Bit Distribution Study and Implementation of Spatial Quality Map in the JPEG-AI Standardization

• URL: http://arxiv.org/abs/2402.17470v1
• Date: Tue, 27 Feb 2024 12:52:44 GMT
• Title: Bit Distribution Study and Implementation of Spatial Quality Map in the JPEG-AI Standardization
• Authors: Panqi Jia, Jue Mao, Esin Koyuncu, A. Burakhan Koyuncu, Timofey Solovyev, Alexander Karabutov, Yin Zhao, Elena Alshina, Andre Kaup
• Abstract summary: The JPEG-AI verification model has been released and is currently under development for standardization. We propose a spatial bit allocation method to optimize the JPEG-AI verification model's bit distribution and enhance the visual quality.
• Score: 39.71764233394706
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Currently, there is a high demand for neural network-based image compression codecs. These codecs employ non-linear transforms to create compact bit representations and facilitate faster coding speeds on devices compared to the hand-crafted transforms used in classical frameworks. The scientific and industrial communities are highly interested in these properties, leading to the standardization effort of JPEG-AI. The JPEG-AI verification model has been released and is currently under development for standardization. Utilizing neural networks, it can outperform the classic codec VVC intra by over 10% BD-rate operating at base operation point. Researchers attribute this success to the flexible bit distribution in the spatial domain, in contrast to VVC intra's anchor that is generated with a constant quality point. However, our study reveals that VVC intra displays a more adaptable bit distribution structure through the implementation of various block sizes. As a result of our observations, we have proposed a spatial bit allocation method to optimize the JPEG-AI verification model's bit distribution and enhance the visual quality. Furthermore, by applying the VVC bit distribution strategy, the objective performance of JPEG-AI verification mode can be further improved, resulting in a maximum gain of 0.45 dB in PSNR-Y.

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