Primary selection for uniform display response

Rodríguez-Pardo, Carlos; Sharma, Gaurav; Feng, Xiaobo

doi:10.1117/12.2041157

Cited by 3 publications

(2 citation statements)

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“…[AOYO00] and [YTO * 02] manually use longpass filters and short-pass filters to modify the RGB channels of two projectors differently to synthesize a 6-primary colorreproduction display. However, larger color gamut is only possible via narrow band primaries that produce more saturated primaries [RPSF14]. Hence, aforementioned works use narrow band primaries, sometimes specially engineered to provide other benefits like high brightness, power-savings and resolution [TYN * 12].…”

Section: Related Workmentioning

confidence: 99%

Content‐Independent Multi‐Spectral Display Using Superimposed Projections

Majumder

et al. 2015

Computer Graphics Forum

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Figure 1: (a) Multi-spectral display system setup with three modified conventional 3-primary projectors, a conventional LCD 3-primary projector for comparison and a high spatial and spectral resolution spectroradiometer (SOC-730 hyperspectral camera) for measurements. (b)The candidate set of 30 primaries used for our prototype, (c) the existing r, g and b filters of the projectors, (d) the 9 filters chosen by our algorithm, (e) the 9-primaries generated by multiplying the r, g and b primaries with the 9 chosen filters. (f) and (g) show the results of our 9-primary multi-spectral display (left) when compared with a conventional 3-primary display (right). AbstractMany works focus on multi-spectral capture and analysis, but multi-spectral display still remains a challenge. Most prior works on multi-primary displays use ad-hoc narrow band primaries that assure a larger color gamut, but cannot assure a good spectral reproduction. Content-dependent spectral analysis is the only way to produce good spectral reproduction, but cannot be applied to general data sets. Wide primaries are better suited for assuring good spectral reproduction due to greater coverage of the spectral range, but have not been explored much. In this paper we explore the use of wide band primaries for accurate spectral reproduction for the first time and present the first content-independent multi-spectral display achieved using superimposed projections with modified wide band primaries. We present a content-independent primary selection method that selects a small set of n primaries from a large set of m candidate primaries where m > n. Our primary selection method chooses primaries with complete coverage of the range of visible wavelength (for good spectral reproduction accuracy), low interdependency (to limit the primaries to a small number) and higher light throughput (for higher light efficiency). Once the primaries are selected, the input values of the different primary channels to generate a desired spectrum are computed using an optimization method that minimizes spectral mismatch while maximizing visual quality. We implement a real prototype of multi-spectral display consisting of 9-primaries using three modified conventional 3-primary projectors, and compare it with a conventional display to demonstrate its superior performance. Experiments show our display is capable of providing large gamut assuring a good visual appearance while displaying any multi-spectral images at a high spectral accuracy.

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Section: Related Workmentioning

confidence: 99%

Content‐Independent Multi‐Spectral Display Using Superimposed Projections

Majumder

et al. 2015

Computer Graphics Forum

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“…Multiband displays and projectors have been proposed for overcoming the limitations on chromaticity and spectral characteristics of RGB‐based image reproduction systems . For displaying accurate yellow and cyan colors, five primary liquid crystal displays had been developed by adding yellow and cyan primary to RGB primary colors .…”

Section: Introductionmentioning

confidence: 99%

Multi‐primary image projector using programmable spectral light source

2016

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-This paper presents a practical prototype of a multi-primary image projector system in which light source spectra can be programmable for suiting any purpose. Our multi-primary projection system is mainly configured with a light source component and an image projection component. The programmable light source can reproduce any spectral curve. Spatial images are then generated using a digital mirror device chip that quickly controls the intensity of the light source spectra in 2D image plane. The multi-primary images in our projection system are reproduced by multiplexing the time-sequential images with different primary colors. Our multi-primary image projector realizes not only wide gamut projection but also spectral projection. To achieve this, we also show how light source spectra of four or six primary colors are designed.Keywords -multi-primary image projector, programmable light source, projector system, wide gamut image projection, spectral image projection.

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