Image and Video Quality Assessment
Building a Large-Scale Natural Image Quality Database
Image Quality Assessment (IQA) has attracted increasing attention due to a number of potential image processing applications. The project objective is to build a large-scale natural image quality database. We intend to collect 10,000 images to make up the database, and all the images will be extracted from the YFCC100M dataset, which provides almost 100 million images and 800,000 videos. Some attributes will be considered to guarantee its diversity, including blur, sharpness, brightness, content, etc. To conduct subjective quality assessment on the large-scale image dataset, crowdsourcing will be adopted.Show more
Saliency-guided Bit Allocation for Image Compression
An image has a foreground and a background region. In image compression standards like JPEG, JPEG2000 it is possible to adaptively allocate coding bits. For example, one may use more bits per pixel in the foreground as compared with pixels in the background. This may potentially increase the perceived image quality, even when the total bitrate for an image is kept the same. So-called saliency maps generalize the binary foreground/background to continuous level and may serve as a more appropriate guide for allocating bits, e.g., per JPEG 8x8 image block. The aim of this project is to design different strategies for this approach and to evaluate the effectiveness by practical user studies.Show more
Influence of Cadence on Optimal Pacing Strategies
In the Powerbike project we develop methods for data acquisition, analysis, modelling, optimisation and visualisation of performance parameters in endurance sports with emphasis on competitive cycling. Currently, one of our main research topics is the optimization of pacing strategies based on mathematical models for the cycling dynamics and the riders physiological parameters. In the starting phase and in very slow/fast segments the cadence will have an influence on these strategies due to the limited gear ratio. Therefore the restrictions due to cadence should be included in our optimization framework.Show more
Pedal Rotation Angle and Velocity Measurement Using an Arduino Microcontroller
In the Powerbike project we develop methods for data acquisition, analysis, modelling, optimisation and visualisation of performance parameters in endurance sports with emphasis on competitive cycling. Essential part of the project is a bicycle simulator based on a Cyclus2 ergometer and our own PC-based control software. The simulator enables to collect high-precision data and simulate real-world tracks in our lab. To improve the simulation we plan the integration of an arduino microcontroller with additional sensors e.g. optical or magnetic ones in order to better measure the rotation angle and velocity of pedals.Show more
The Role of Cadence on Oxygen Uptake Kinetics in Cycling
Respiratory gas exchange measurements are a common method to assess physical fitness and endurance capabilities of athletes. We develop models for predicting oxygen uptake kinetics with respect to a persons power output on a cycle ergometer. These models have successfully been validated with ergometer cycling exercises at a constant cadence.
However cycling exercise in the field is not restricted to constant cadences. Therefore some open questions remain. For example:
- Has a varying cadence an influence on the oxygen uptake and if so, to what extent?
- Does the maximal oxygen uptake change for different cadences?
- Finally, if there is an influence, how can we adjust our models appropriately?
Measuring and Modeling Wind during Road Cycling
During road cycling, one of the bigger uncertainties is wind. Wind direction and force both affect cycling performance.
One goal of the powerbike project, the optimization of pacing strategies for road cycling relies on a mathematical model for road cycling (Martin et al., 1998). The current state-of-the-art omits the possibility of having different wind forces and directions during a ride.
Therefore, we are looking forward for wind measurement solutions and an extended road cycling model.Show more
Between-day Variablity of VO2, VCO2 and Heart Rate for Variable Work Rate
Measurements of VO2, VCO2 and heart rate are central to methods for assessment of physical fitness and endurance capabilities in athletes. The aim of this study is to quantify the between-day variablity of VO2, VCO2 and heart rate measurements during ergometer tests with variable work rate.Show more