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Wei-Chung Cheng; Evaluating chromatic contrast sensitivity functions during saccades. Journal of Vision 2007;7(9):674. doi: 10.1167/7.9.674.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: The Color Breakup phenomenon is the most challenging problem for today's field sequential liquid crystal displays, in which the temporally synthesized white appears as separated red, green, and blue in different regions of retina during saccades. Since only the M-pathway is selectively suppressed, the color breakup phenomenon remains perceivable during saccades. For the display industry, measuring, modeling, and predicting color breakup is essential to derive any feasible solution. Although Daly and Kelly have offered models of spatio-velocity contrast sensitivity functions during smooth pursuit, they are not sufficient to predict high-speed saccade-induced color breakup.
The color breakup of a white patch can be considered as a series of red, green, and blue flashes across retina. Therefore, degree of color breakup depends on the temporal frequency (field rate), spatial frequency (Gabor), retinal velocity (saccade length), luminance (Block law), size (Franit-Harper law), duty cycle (Broca-Sulzer law), wavelength (Hecht-Shlaer law), eccentric position (Hecht-Verrijp), and so on. Our goals are to measure the threshold of detecting color breakup by using behavioral approaches and to derive prediction models.
Method: We have built a display platform which was capable of producing arbitrary color sequences to synthesize white. Two-interval forced choice experiments were used to induce saccades and to determine the color breakup threshold. In the mean time, a head-mount eye-tracker was used to record the saccade trajectories. The experiments swept different contrasts and Gabor patterns as independent variables.
Results: The resulting data and models resemble the previous ones for smooth pursuit with minor modification. Since the detectability varies with wavelength, it is possible to derive the optimal mix of red, green, and blue that generates the least color breakup with given luminance. It also suggests the possibility of novel interactive display systems that minimize color breakup by substituting chromaticity dynamically when saccades initiate.
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