PIC: Revisiting INR for Image Coding with Fast Encoding and Sub-Millisecond Decoding

• URL: http://arxiv.org/abs/2609.09020v1
• Date: Tue, 08 Sep 2026 16:52:00 GMT
• Title: PIC: Revisiting INR for Image Coding with Fast Encoding and Sub-Millisecond Decoding
• Abstract summary: Implicit neural representation (INR) has achieved remarkable progress in novel view synthesis and image/video coding in recent years.<n>In this work, we propose a feedforward INR image coding architecture, Practical INR Image Codec (PIC), that computes all the necessary information for INR network in a single forward pass.
• Score: 74.2282307661978
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Implicit neural representation (INR) has achieved remarkable progress in novel view synthesis and image/video coding in recent years.Compared to conventional end-to-end image codecs, INR-based compressors demonstrate significant advantages in decoding complexity. However, their practical application has been hindered by the inferior encoding speed and underutilized decoding efficiency.In this work, we propose a feedforward INR image coding architecture, Practical INR Image Codec (PIC), that computes all the necessary information for INR network in a single forward pass, achieving an encoding speed of 20 FPS. Additionally, we implement a highly optimized decoder that reaches 2000 FPS decoding speed, significantly surpassing JPEG's performance at comparable rate-distortion (RD) performance. To the best of our knowledge, this work presents the first learning-based image codec that simultaneously outperforms or is comparable with JPEG in both RD performance and decoding speed while maintaining practical encoding speed. Code is available at https://github.com/actcwlf/PIC.

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