A spatio-chromatic colour appearance model for retargeting high dynamic range image appearance across viewing conditions
Lead Research Organisation:
University of Liverpool
Department Name: Institute of Psychology Health & Society
Abstract
Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.
People |
ORCID iD |
| Sophie Wuerger (Principal Investigator) |
Publications
Ashraf M
(2020)
Spatio-chromatic contrast sensitivity across the lifespan: interactions between age and light level in high dynamic range
in Color and Imaging Conference
Ashraf M
(2020)
Spatio-chromatic contrast sensitivity across the life span: interactions between age and light level in high dynamic range
in Journal of Vision
Kim M
(2020)
Contrast Sensitivity Functions for HDR Displays
in London Imaging Meeting
Kim M
(2020)
Contrast Sensitivity Functions for HDR Displays
Wuerger S
(2020)
Spatio-chromatic contrast sensitivity under mesopic and photopic light levels.
in Journal of vision
Wuerger S
(2019)
Luminance and chromatic contrast sensitivity at high light levels
in Journal of Vision
| Description | Our data demonstrate a previously unknown characteristic of the visual system at high luminance. Using the data, we developed a new, fundamental model of the human visual system (the spatio-chromatic sensitivity function) that can predict the visibility of black-and-white and colour patterns under very dim (0.02 cd/m^2) and very bright (10,000 cd/m^2) viewing conditions. We are currently investigating the application of the model in several problems, including high-dynamic-range video compression and modelling of colour appearance. Updates, data and code are available on https://www.cl.cam.ac.uk/research/rainbow/projects/hdr-csf/ |
| Exploitation Route | Our work has implications for improving future HDR image and video coding standards. Our work can also help to design better colour spaces and metrics for high-dynamic-range content. One of such metrics was presented in a recently published SIGGRAPH paper: http://dx.doi.org/10.1145/3450626.3459831 |
| Sectors | Creative Economy,Digital/Communication/Information Technologies (including Software),Healthcare |
| URL | https://pcwww.liv.ac.uk/~sophiew/spatio.htm |
| Description | Since the publication of our CSF model and the data base, we had plenty of interest from industry and several requests to use our model for evaluation driver safety. We do not keep track of the number of downloads of the model and the software. Our new CSF function and the related research on models of banding have lead to the development of two important quality metrics, now widely used in the industry (video compression, method evaluation, display engineering, AR/VR modeling): * PU21: A novel perceptually uniform encoding for adapting existing quality metrics for HDR - http://dx.doi.org/10.1109/PCS50896.2021.9477471 - https://github.com/gfxdisp/pu21 * FovVideoVDP: A visible difference predictor for wide field-of-view video - http://dx.doi.org/10.1145/3450626.3459831 - https://www.cl.cam.ac.uk/research/rainbow/projects /fovvideovdp/ The work also raised the interest of the industrial partners, which are now funding follow-up research. |
| First Year Of Impact | 2021 |
| Sector | Digital/Communication/Information Technologies (including Software),Electronics |
| Impact Types | Economic |
| Description | Human contrast sensitivity in the chromatic-temporal domain |
| Amount | £45,339 (GBP) |
| Funding ID | JXR30648 |
| Organisation | |
| Sector | Private |
| Country | United States |
| Start | 01/2022 |
| End | 12/2022 |
| Description | Inclusive rendering on additive displays |
| Amount | $75,000 (USD) |
| Organisation | |
| Sector | Private |
| Country | United States |
| Start | 06/2022 |
| Title | Code CIC paper model |
| Description | The model predicts contrast sensitivity for any colour direction and was fitted to 5 independent datasets, as described in the CIC28 paper. |
| Type Of Material | Computer model/algorithm |
| Year Produced | 2020 |
| Provided To Others? | Yes |
| Impact | New Colalboratoins |
| URL | https://github.com/gfxdisp/omni-csf |
| Title | Code for the JoV paper model |
| Description | The model predicts contrast sensitivity for the three colour directions in the DKL colour space and was fitted to the data presented in the JoV paper. |
| Type Of Material | Computer model/algorithm |
| Year Produced | 2020 |
| Provided To Others? | Yes |
| Impact | new collaborations |
| URL | https://github.com/MalihaAshraf/CSF_luminance_model |
| Title | Data base for CSF measurements on an HDR display |
| Description | Contrast sensitivity data may be useful to test current models of human vision. |
| Type Of Material | Database/Collection of data |
| Year Produced | 2020 |
| Provided To Others? | Yes |
| Impact | testing current models of human vision; designing better displays. |
| URL | https://pcwww.liv.ac.uk/~sophiew/spatio.htm |
| Title | Measurements of spatio-chromatic contrast sensitivity up to 7000 cd/m^2 |
| Description | Measurements of spatio-chromatic contrast sensitivity up to 7000 cd/m^2 |
| Type Of Material | Database/Collection of data |
| Year Produced | 2020 |
| Provided To Others? | Yes |
| Impact | Our published CSF data have been used in numerious image quality application. |
| URL | https://www.repository.cam.ac.uk/handle/1810/30422 |
| Description | New Collaboration with Prof Luo |
| Organisation | Zhejiang University |
| Department | Department of Optical Engineering |
| Country | China |
| Sector | Academic/University |
| PI Contribution | We have helped with modelling the data. Conference Proceedings: Luo, R., Westland, S, Wuerger, S, Mantiuk, R. (2020). Spatial Chromatic Contrast Sensitivity Band-pass or low-pass functions? Color and Imaging Conference, Chiba, Japan. Full paper in OSA is under review. |
| Collaborator Contribution | Provided experimental data. |
| Impact | Conference Proceedings: Luo, R., Westland, S, Wuerger, S, Mantiuk, R. (2020). Spatial Chromatic Contrast Sensitivity Band-pass or low-pass functions? Color and Imaging Conference, Chiba, Japan. Full paper in OSA is under review. |
| Start Year | 2020 |
| Description | New collaboration with Facebok, USA |
| Organisation | |
| Country | United States |
| Sector | Private |
| PI Contribution | The research attracted interes from Facebook, USA, which then made a donation to further fund the current RA, Maliha Ashraf. A second donation was made, also to Prof Sophie Wuerger, to further investigate inclusive rendering on additivie displays. |
| Collaborator Contribution | The research attracted interes from Facebook, USA, which then made a donation to further fund the current RA, Maliha Ashraf. A second donation was made, also to Prof Sophie Wuerger, to further investigate inclusive rendering on additivie displays. |
| Impact | no outcomes yet. |
| Start Year | 2022 |
| Description | AVA 2020 Virtual Christmas Meeting |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Other audiences |
| Results and Impact | "Effect of ageing of optical elements of the human visual system on its contrast sensitivity" Ashraf, M., Mantiuk, R. K., Martinovic, J. & Wuerger, S. Published abstract: AVA 2020 Virtual Christmas Meeting December 21, 2020. Perception. 2021;50(6):573-592. doi10.1177/03010066211008:143 |
| Year(s) Of Engagement Activity | 2021 |
| Description | Colour Group GB January Vision Meeting |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | International |
| Primary Audience | Postgraduate students |
| Results and Impact | Effect of ageing of optical elements of the human visual system on its contrast sensitivity Ashraf, M., Wuerger, S., Mantiuk, R. K. & Martinovic, J. |
| Year(s) Of Engagement Activity | 2021 |
| Description | Focus Group for elderly display users |
| Form Of Engagement Activity | A formal working group, expert panel or dialogue |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Other audiences |
| Results and Impact | This focus group was held in Aberdeen and was run by Dr. Martinovic. Elderly users were asked to evaluate various displays with content that was enhanced using specialised software adapted to the elderly visual system. Participants could provide feedback on quality and usability of displays. |
| Year(s) Of Engagement Activity | 2018 |
| Description | Invited talk |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Other audiences |
| Results and Impact | Invited talk at the Applied Vision Association Meeting, held at Qinetic, Farnborough. Received the Geoffrey-Burton-Lecturer for significant contributions to vision science; |
| Year(s) Of Engagement Activity | 2019 |
| URL | http://www.theava.net/meetings.php?s=spring-meeting-2019-and-agm-at-farnborough |
| Description | Invited talk |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Professional Practitioners |
| Results and Impact | Talk at the Colour Group Meeting, London, UK on "Luminance and chromatic sensitivity at high light levels". The audience consists of scientists, artists, professionals from film and photography. |
| Year(s) Of Engagement Activity | 2019 |
| URL | https://www.colour.org.uk/about/ |
| Description | Scottish Vision Group Meeting |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Geographic Reach | National |
| Primary Audience | Postgraduate students |
| Results and Impact | Takl on the "Effect of ageing of human visual system on suprathreshold contrast vision" Ashraf, M., Wuerger, S., Martinovic, J. & Mantiuk, R. K. |
| Year(s) Of Engagement Activity | 2021 |