RheinMain University of Applied Sciences in Wiesbaden, Germany, recently invested in Ikegami UHK-430 camera technology as the preferred solution for its studies in high dynamic range video imaging. The university's Enhanced Video Imaging (EVI) project involved the development of an automatic process to detect and brighten dark sections of video, while at the same time sensing and enhancing detail in over-exposed sections.
"One of the main issues involved in progressing from standard dynamic range to high dynamic range television is the need to provide good downward compatibility with the huge number of SDR television receivers already installed and in current use," said Mike Christmann, professor - Media Technology, RheinMain University of Applied Sciences.
The new generation of broadcast cameras can provide a much wider scene contrast range than conventional displays and it is obvious that converters are needed to handle the different formats. A highly dynamic sensor with low noise is key to obtaining the best results from EVI. The more image information one can collect from the camera, the better the system will perform.
"Our studies demonstrated beyond question that scene luminance values should not always be reproduced one-to-one on an HDR display," detailed Lucien Lenzen, who managed the project. "Non-uniform scenes can actually look worse in HDR than in SDR due to the effects of glare. Homogenisation techniques, such as using different windows in colour grading, can help to compensate for these effects but are not practical when transmitting live," he added.
The UHK-430 is a 4K-native camera system with simultaneous HDR/SDR processing. Its three 2/3 inch CMOS sensors provide full 3840 x 2160 UHD resolution plus the depth of field needed for studio and outdoor production. The camera is equipped with a B4 bayonet mount compatible with 2/3 inch HD lenses. An optional SE-U430 expander accommodates large studio or OB lenses.