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Dive into the research topics where Juergen Wuenschmann is active.

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Featured researches published by Juergen Wuenschmann.


IEEE Journal of Solid-state Circuits | 2009

A CMOS Chip With Active Pixel Array and Specific Test Features for Subretinal Implantation

Albrecht Rothermel; Liu Liu; Naser Pour Aryan; Michael Fischer; Juergen Wuenschmann; Steffen Kibbel; Alex Harscher

This paper presents a CMOS imager chip that is aimed at subretinal implantation for partially restoring human vision. It has low supply voltage (plusmn 2 V) and all DC free terminals for long life wired operation. Stimulation voltage is increased to approximately 4 Vpp by low voltage drop design. 40 x 40 pixel cells including light sensors, amplifiers, control logic and electrode drivers are addressed sequentially to improve power consumption and spatial resolution of perception. Pad count is limited to 6, which requires a specific test procedure. The 3 x 3 mm2 design is fabricated in a 0.35 mum CMOS technology optimized for optical performance.


international conference on consumer electronics berlin | 2012

On quality of object-based video material

Juergen Wuenschmann; Julian Forster; Christian Feller; Albrecht Rothermel

Object-based video coding is a fairly new topic and while quality assessment is a main part of traditional video coding it has not been investigated much for object-based material. Many quality assessment metrics have been published and some are widely used. If they can be used for object-based material as well is evaluated in this paper. The two most used full-reference algorithms and two promising no-reference algorithms have been tested. Only one of the no-reference algorithms correlates with subjective impressions and expected quality results. This algorithm unfortunately is very slow (over 8 min/frame).


international conference on consumer electronics berlin | 2013

Model-based video compression for real world data

Christian Feller; Juergen Wuenschmann; Raimar Wagner; Albrecht Rothermel

This work examines the benefits for displaying video content on a 2D screen that can be gained by incorporating depth information into the encoding process. The creation of a 3D model helps to compensate for redundant encoding of reappearing contents beyond group of picture borders, like needed in hybrid video codecs. Starting with filtering the image data, creating a 3D model and applying a model-based compression via MPEG-IV / Part 25 to the model, finally a 2D video representation is rendered. Subjective quality assessments of first preliminary results show, that the perceived video quality is comparable with H.264/AVC encoded videos for low quality scenarios when working with a static 3D model.


international conference on consumer electronics | 2013

Subjective quality assessment of object-based video material

Juergen Wuenschmann; Albrecht Rothermel

A subjective quality test for the comparison of object-based (modeled, animated) and pixel-based video material has been carried out and the results are summarized in this paper. Tests showed that well known objective quality measures produce arguable results in this test constellation and therefore subjective quality assessment is the only way to reliably judge these test cases. The results show, that observers are very confident with the judgment of video material and can very well distinguish between different quality levels. For 10 out of 12 test cases, the observers could not distinguish the object-based from the original video material.


international conference on consumer electronics berlin | 2012

Video and disparity compression for automotive stereo vision algorithms

Julian Forster; Raimar Wagner; Juergen Wuenschmann; Roland Schweiger; Anestis Terzis; Albrecht Rothermel

This paper introduces a compression system for automotive stereo algorithms. We propose a method to compress video, disparity and occlusion information based on a 12 bit per pixel H.264/AVC encoder. A rate allocation parameter controls the available bit rate between video and disparity. In addition, the occlusion information is lossless encoded into the bit stream. For driver assistance systems that rely on the disparity information, a higher bit rate can be allocated for the disparity to obtain a better accuracy.


IEEE Transactions on Consumer Electronics | 2011

Audio signal processing adapted to mobile reception of DVB-T

Thorsten Roll; Leo Vepa; Juergen Wuenschmann; Albrecht Rothermel

Mobile reception of digital TV (DTV) is becoming popular and signal processing has to be adapted to the new requirements. This is already done for the DTV receivers but the MPEG decoders are still subject to improvement. Since audio errors are perceived as being much more annoying than video errors, this paper focuses on the adaptations of the audio signal processing. An evaluation of the influence of mobile transmission errors on the audio processing is presented and adaptations are proposed. We show that the amount of correctly decoded frames can be increased by up to 5 % whereas the amount of incorrectly decoded frames can be decreased by up to 16 %. Both will result in an improvement of the perceived audio quality1.


international conference on consumer electronics berlin | 2014

Model optimization for model-based compression of real world video data

Christian Feller; Juergen Wuenschmann; Raimar Wagner; Albrecht Rothermel

The availability of affordable cameras with additional depth sensor boosted the advances in the field of Simultaneous Localization and Mapping (SLAM). This area of research addresses creating a 3D representation of unknown environment by fusing sensor information. Whereas a coarse representation suffices for navigational purposes, the resulting 3D models are not accurate enough to allow rendering a visually pleasing video stream based on the gathered information, when applying a model based video compression standard such as MPEG-4 Part 25. This publication focuses on increasing the accuracy of the created 3D models in order to improve the perceived quality when using model-based video coding and aims for performance comparable to hybrid video encoding.


international conference on consumer electronics berlin | 2013

Bézier spline fitting approach for rotational animation encoding in MPEG 4 part 25

Juergen Wuenschmann; Andre Burkard; Christian Feller; Albrecht Rothermel

Object-based video representation and coding promises to keep the largest amount of scene information during video transmission and processing for animated video. We propose a new codec for rotational animation in MPEG 4 Part 25, that is more connected to the input format and can therefore avoid drawbacks of the current implementation. The codec uses Bézier spline fitting to approximate the animation curves. With that approach a mean data-rate saving of over 60% is achieved.


international conference on consumer electronics berlin | 2011

The VP8 video codec - overview and comparison to H.264/AVC

Christian Feller; Juergen Wuenschmann; Thorsten Roll; Albrecht Rothermel


international conference on consumer electronics berlin | 2011

Analysis and improvements to the object based video encoder MPEG 4 part 25

Juergen Wuenschmann; Thorsten Roll; Christian Feller; Albrecht Rothermel

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