Search Results for author: Kristian Fischer

Found 14 papers, 3 papers with code

On Versatile Video Coding at UHD with Machine-Learning-Based Super-Resolution

no code implementations12 Aug 2023 Kristian Fischer, Christian Herglotz, André Kaup

Coding 4K data has become of vital interest in recent years, since the amount of 4K data is significantly increasing.

4k Image Super-Resolution

Spatially-Adaptive Learning-Based Image Compression with Hierarchical Multi-Scale Latent Spaces

no code implementations12 Jul 2023 Fabian Brand, Alexander Kopte, Kristian Fischer, André Kaup

Current state-of-the-art neural-network-based image compression systems however use only one scale to transmit the latent space.

Image Compression Video Compression

The Bjøntegaard Bible -- Why your Way of Comparing Video Codecs May Be Wrong

1 code implementation25 Apr 2023 Christian Herglotz, Hannah Och, Anna Meyer, Geetha Ramasubbu, Lena Eichermüller, Matthias Kränzler, Fabian Brand, Kristian Fischer, Dat Thanh Nguyen, Andy Regensky, André Kaup

Using additional supporting points inbetween standard points defined by parameters such as the quantization parameter, we assess the interpolation error of the Bj{\o}ntegaard-Delta (BD) calculus and its impact on the final BD value.

Quantization SSIM +1

Saliency-Driven Hierarchical Learned Image Coding for Machines

no code implementations27 Feb 2023 Kristian Fischer, Fabian Brand, Christian Blum, André Kaup

Areas without saliency are transmitted in latent spaces of lower spatial resolution in order to reduce the bitrate.

Image Compression object-detection +1

Learning Frequency-Specific Quantization Scaling in VVC for Standard-Compliant Task-driven Image Coding

1 code implementation20 Jan 2023 Kristian Fischer, Fabian Brand, Christian Herglotz, André Kaup

This is a well-known method for the human visual system, where scaling lists are derived from psycho-visual models.

Quantization

Evaluation of Video Coding for Machines without Ground Truth

no code implementations13 May 2022 Kristian Fischer, Markus Hofbauer, Christopher Kuhn, Eckehard Steinbach, André Kaup

To mitigate this problem, we propose an evaluation method based on pseudo ground-truth data from the field of semantic segmentation to the evaluation of video coding for machines.

Instance Segmentation object-detection +3

Analysis of Neural Image Compression Networks for Machine-to-Machine Communication

no code implementations13 May 2022 Kristian Fischer, Christian Forsch, Christian Herglotz, André Kaup

Video and image coding for machines (VCM) is an emerging field that aims to develop compression methods resulting in optimal bitstreams when the decoded frames are analyzed by a neural network.

Image Compression SSIM

On Intra Video Coding and In-loop Filtering for Neural Object Detection Networks

no code implementations11 Mar 2022 Kristian Fischer, Christian Herglotz, André Kaup

Classical video coding for satisfying humans as the final user is a widely investigated field of studies for visual content, and common video codecs are all optimized for the human visual system (HVS).

Autonomous Driving object-detection +2

Video Coding for Machines with Feature-Based Rate-Distortion Optimization

no code implementations11 Mar 2022 Kristian Fischer, Fabian Brand, Christian Herglotz, André Kaup

In this paper, we propose a standard-compliant feature-based RDO (FRDO) that is designed to increase the coding performance, when the decoded frame is analyzed by a neural network in a video coding for machine scenario.

Quantization

Learning True Rate-Distortion-Optimization for End-To-End Image Compression

no code implementations5 Jan 2022 Fabian Brand, Kristian Fischer, Alexander Kopte, André Kaup

Even though rate-distortion optimization is a crucial part of traditional image and video compression, not many approaches exist which transfer this concept to end-to-end-trained image compression.

Image Compression MS-SSIM +2

Boosting Neural Image Compression for Machines Using Latent Space Masking

1 code implementation15 Dec 2021 Kristian Fischer, Fabian Brand, André Kaup

Compared to the standard VVC, 41. 4% of bitrate are saved by this method for Mask R-CNN as analysis network on the uncompressed Cityscapes dataset.

Benchmarking Image Compression

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