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Developing Better HDR Displays - Expanding Dynamic Range

Case Study: Expanding the dynamic range of HDR displays

The second of two projects with BrightSide, now part of the Dolby group, this project supported the development of better HDR displays by using non-linear algorithms to expand the dynamic range of images with low contrast.

Aim

To establish the best method for expanding the range of low dynamic images so as to make full use of novel HDR displays.

Client

BrightSide Technologies (now part of the DOLBY group)

Funding

EPSRC (Engineering and Physical Sciences Research Council) grant.

Project

Combining image processing algorithms with our understanding of device technology and visual perception we established a new inverse tone mapper and using psychophysical techniques and compared its performance with other methods developed for range expansion.

Results

Our experiments have shown that simple single or multiple linear scales do not perform well in comparison with a reference HDR image. More complicated algorithms present better performance compared to simpler ones. For image-based lighting applications, while differences are not that absolute, a distinction can still be made between non-linear algorithms and purely linear expansions.

Publications