Research On Color Perception Of Anomalous Trichromats Based On A Laser Display

Laser display is a new generation of display technology following black and white display,color display and digital display.Because the laser with high monochromaticity and high energy conversion efficiency is used as the display light source,the laser display has the advantages of wide color gamut,high brightness,long life,low power consumption and healthy display.The emergence of laser display has revolutionized the display in terms of brightness,color,clarity,resolution,and screen.Its unique spectral separation characteristics,excellent color expression,and ultra-high brightness output make the screen exhibit excellent expressiveness,which provides a reliable technical approach for the reproduction of full-fidelity images.Our country has included laser display in the "National Program for Medium-to-Long-Term Scientific and Technological Development" and "14th Five-Year Planfor National Economic and Social Development".Since the spectral coordinates of the laser light source are close to the MacAdam limit,laser display is currently the only display technology that can meet the IEC’s REC.2020 standard.Thanks to the advantages of the wide color gamut of the above-mentioned laser display,the laser display can also be used to improve the color perception of anomalous trichromats.Anomalous trichromats belong to a type of people with color vision deficiency.Because the spectral response curves of the redsensitive and green-sensitive cone cells on the retina have a certain degree of crosstalk compared with normal people,they have abnormal color perception.With the support of the National Key Research and Development program of China,combined with the research conditions of the research group,this paper uses a laser projector to study the color perception of anomalous trichromats,and explores color vision solutions for anomalous trichromats,so that laser display is expected to be an auxiliary mean to improve the color vision of anomalous trichromats.The main research contents and results of the dissertation are as follows:1.This study proposes a color discrimination experiment based on a display system,establishes a test platform for human eye color discrimination,tests the observer’s ability to discriminate colors in different color directions,and demonstrated that a laser display with a wide color gamut can significantly improve the color perception of anomalous trichromats.The results show that compared with the small color gamut,the medium color gamut improves the color discrimination ability of the abnormal trichromat by more than 20%on average;and the large color gamut has the highest color discrimination ability compared with the small color gamut.increased by more than 100%.2.The optical pigment sensitivity curve based on the cone cells of anomalous trichromats has a certain degree of offset compared to the normal observer.Combined with the correction of the eye lens and the retinal macular pigment absorption function,the cone response function at the retinal level is obtained.Three cone response functions were derived at the corneal level.By calculating the color gamut boundaries of anomalous trichromats,this study quantitatively describes the perceived color range of anomalous trichromats in stereoscopic color space,and finally gives a spectral selection that maximizes the color gamut volume of anomalous trichromats.3.The color perception model for anomalous trichromats in a large field of view is established,which can provide a reference for large-screen display products for anomalous trichromats,and improve the viewing experience of such people.Based on the photopigment shift of the anomalous trichromats,and considering that the distribution of cone cells has a certain functional relationship with the size of the field of view,this study established a threedimensional color gamut model of the anomalous trichromats.The results show that the model is compatible with the calculation of various light sources,and intuitively describes the color perception of anomalous trichromats in a large field of view.4.The image perception mapping relationship between normal observers and anomalous trichromats is established,and their image perception is improved through certain algorithm optimization.In this study,the photopigmentshifting model is used,and the red,green and blue information in the picture is processed by the human eye color information processing model,and the actual color perception image of anomalous trichromats is obtained.In this study,the method of histogram equalization is used to separately process the RGB information of anomalous trichromats,recolor their perceptual images.Finally,the recolor images are evaluated with contrast and naturalness,and the result shows that the images are well enhanced.Highlights of the dissertation are as follows:1.This paper establishes a test platform for human eye color discrimination,and conducts color discrimination experiments of anomalous trichromats in different display color gamuts,and obtains the color discrimination ability of anomalous trichromats in different color gamuts.The laser display system with a wide color gamut can significantly improve the visual experience of the observer,which can maximize the advantages of the wide color gamut of the laser display.So far,no related research has been found.2.This paper establishes the stereo color gamut model of the anomalous trichromats.Through the evaluation method of the color gamut volume,the color discrimination ability of anomalous trichromats in the stereo color space is obtained,which well explains that the wide color gamut display system contributes to the color perception improvement for anomalous trichromats.To improve the color perception of anomalous trichromats,by optimizing the central wavelength of the laser li ght source,the number of colors perceived by anomalous trichromats has been increased.This takes advantage of the fact that laser displays can be customized for anomalous trichromats.3.This paper establishes the color perception model of anomalous trichromats in a large field of view.Through the optimization of the wavelength of the laser light source,the color gamut volume for different types of anomalous trichromats is maximized.This theory can be applied to the simulation of color perception in the field of view of 1-degree to 10-degree,which provides a reference for the customization of laser display products in different application scenarios.4.This paper studies the image mapping relationship between normal observers and anomalous trichromats.The quantitative relationship between laser light source and the perception images of anomalous trichromats is obtained,which has an important guiding significance for light source optimization of laser display.