Mechanisms of the artifacts accompanying with image motion on Flat Panel Displays (FPDs), e.g. motion blur, jerky motion, and dynamic false contour, etc deteriorating picture quality, will be explained on the bases of image projected on the retina. The solutions for decreasing the artifacts will be reviewed and other possible artifacts will be discussed.

SUMMARYIn this study, the spatiotemporal characteristics of human speed perception are measured in the spatiotemporal frequency domain through a psychophysical experiment. Based on the experimental results, the mechanism for speed perception is investigated. The existence of a speed-tuned mechanism and the role of the temporal frequency in speed perception are demonstrated. The method of speed comparison by simultaneous presentation is used in the experiment. Two moving gratings are used as the standard and the comparison stimuli, and the "stimulation of subjectively equal speed" (SSES) is determined for the standard stimulus in spatiotemporal frequency coordinates. As experimental results, two different spatiotemporal characteristics are shown. For the speed range lower than 3.2 deg/s, the speed perception depends only on the physical speed of the stimulus, which suggests the existence of a speed-tuned mechanism. In the range higher than that value, the speed perception depends on the physical speed and the temporal frequency of the stimulus, indicating that both a speedtuned mechanism and a temporal frequency-tuned mechanism are involved. Based on these experimental results, the human mechanism in speed perception is described by using a speed-tuned mechanism and a temporal frequencytuned mechanism. A basic framework for a speed perception model is proposed.

SUMMARYAcquisition of accurate colors is important in the modern era of widespread exchange of electronic multimedia. The variety of device-dependent color spaces causes troubles with accurate color reproduction. In this paper we present the outlines of accomplished digital camera system with device-independent output formed from tristimulus XYZ values. The outstanding accuracy and fidelity of acquired color is achieved in our system by employing an embedded color calibration system based on emissive device generating reference calibration colors with user-defined spectral distribution and chromaticity coordinates. The system was tested by calibrating the camera using 24 reference colors spectrally reproduced from 24 color patches of the Macbeth Chart. The average color difference (CIEDE2000) has been found to be ΔE = 0.83, which is an outstanding result compared to commercially available digital cameras.

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