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Surgeons, CCTV & TV football gain from new video technology that banishes shadows and flare

Date:
January 20, 2011
Source:
University of Warwick
Summary:
Researchers have developed the world's first complete High Dynamic Range (HDR) video system, from video capture to image display, that will help a range of users including: surveillance camera operators, surgeons using video to conduct or record surgery, and camera crews following a football being kicked from sunshine into shadow.

Professor Alan Chalmers.
Credit: Image courtesy of University of Warwick

Researchers at the University of Warwick have developed the world's first complete High Dynamic Range (HDR) video system, from video capture to image display, that will help a range of users including: surveillance camera operators, surgeons using video to conduct or record surgery, and camera crews following a football being kicked from sunshine into shadow.

The researchers will be premiering footage of the world's first ever showing of a short film shot using this new HDR technology in the WMG Digital Laboratory at the University of Warwick on January 19.

Professor Alan Chalmers of WMG's Visualisation Research group at the University of Warwick will show the footage and talk about the Engineering and Physical Sciences Research Council (EPSRC) project that has helped fund this research. Huw Bowen, of Entanglement Productions, will also discuss the challenges and advantages of making a film in HDR.

Professor Alan Chalmers said: "We have put together unique compression software with a high performance HDR camera and HDR displays that will revolutionise the use of HDR in a range of applications. The impact will be enormous, for example, the ability to clearly see the football when it is kicked from the shadow of the stadium into sunshine, or surveillance cameras which can detect detail even in extreme lighting conditions."

"We have also recently successfully trialled its use to assist and document surgery together with the thoracic surgery team and the multi-media group at Heartlands Hospital. HDR is able to accurately capture for the first time the wide range of lighting present in an operation from the dark body cavities through to the bright highlights on the shiny medical instruments."

"The natural world presents us with a wide range of colours and intensities. In addition, a scene may be constantly changing with, for example, significant differences in lighting levels going from outside to inside or simply as the sun goes behind some clouds etc. A human eye can cope with those rapid changes and variety but a traditional camera is only capable of capturing a limited range of lighting in any scene. The actual range it can cope with depends on the exposure and f-stop setting of the camera. Anything outside that limited range is either under- or over-exposed."

"HDR imagery offers a more representative description of real world lighting by storing data with a higher bit-depth per pixel than more conventional images. Although HDR imagery for static images has been around for 15 years, it has not been possible to capture HDR video until now. However such HDR images are typically painstakingly created in computer graphics or generated from a number of static images, often merging only 4 exposures at different stops to build an HDR image."

"Our new HDR camera technology and software enables us to capture and display dynamic HDR images, covering at least 20 f-stops, at full high-definition resolution, and at 30 frames-per-second. Furthermore, HDR can complement 3D technology by providing depth perception without the need to wear 3D glasses."

VIDEO: http://www2.warwick.ac.uk/newsandevents/podcasts/upload/?podcastItem=high_dynamic_range_research_at_the_university_of_warwick.m4v


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The above story is based on materials provided by University of Warwick. Note: Materials may be edited for content and length.


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