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Wei-Chung Cheng, Chih-Nan Wu, Chih-Lei Wu; An EOG-assisted saccade-contingent color breakup-free display. Journal of Vision 2008;8(6):581. doi: 10.1167/8.6.581.
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This paper presents a contingent field sequential display that inhibits color breakup on-the-fly when saccadic eye movement is detected. On field sequential displays, which synthesize colors in the time domain, the color breakup phenomenon occurs when the three primary components of the same object project onto different locations of retina upon saccadic eye movement. While saccadic suppression inhibits the luminance channel, the rainbow-like chromatic signals are not suppressed and become the major artifacts of field sequential displays. The project goal is to build a saccade-contingent display that switches between two modes. The display functions normally when the viewer gaze is in fixation or smooth pursue. Once a saccade is detected, the display immediately reduces the image chroma to the threshold that color breakup is not perceivable until the saccade finishes. The saccadic eye movement is detected by a remote battery-powered electrooculogram (EOG) sensing circuit, which includes operational amplifiers, low-/high-pass filters, notch filters, and infrared LEDs. The saccade event is conveyed via the infrared beams and received by a local infrared sensor. An FPGA board was used to drive the infrared sensor and modify the image. The chroma is reduced by adjusting the red, green, and blue primaries from LED backlights. Each primary can be mixed with the other two primaries such that the chroma is reduced while the luminance is increased. To find the threshold of perceiving color breakup, we designed a saccadic display, which is a 32×1 linear red-green LED array driven by FPGA. Each row of the given image is displayed by the linear LED array sequentially. The whole image will be perceived only on a synchronized saccade. We used the EOG circuit to trigger the display when a saccade is detected.
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