The Journal of the Institute of Television Engineers of Japan

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Changes of impressions and degree of fatigue and performance were investigated to determine the optimal color presentation of the VDT. In these experiments green and white letters in the negative presentation mode and four kinds of white background colors in the positive presentation mode were used. These colors were evaluated by five male observers. They engaged in VDT work an hour a day for six weeks. CFF was measured before an after the work, and questionnaire surveys of impressions for the presented colors were also carried out. The following results were obtained. Although the preference impression grew worse after the work with both presentation modes, the degree of preference before the work with negative modes was higher and more stable than with positive modes. However, the degree of fatigue after the work with the positive modes was less than that of the negative modes. Performances in the positive modes were slightly higher than in the negative modes.

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To obtain basic data about the psychological effect of a wide-display, a head and eye-movement analyzer was developed and Eye-Head coordination during saccadic tracking of movements was analyzed. The experiments were done in two ways, using boards with large and small viewing angles as targets. With a large viewing angle, when the target was moved consistently, the angular head displacement increased by more than five degrees, and 65% more than ten degrees. On the other hand, when the target was moved at random, it increased to sixty degrees and reached 65%. With a small viewing angle, when the target moved consistently, the proportion of angular head displacement increased with the movement of the angle of the target. But when the target was moved at random, it showed a minimum value. This suggest that there is a difference in the viewing attitude for large and small viewing angles.

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In conventional television systems, such as NTSC, gamma correction takes places at the transmitter, with the result that some of the luminance of a subject is conveyed by the chrominance channels as well as by the luminance channel. The band-limitation of the chrominance channels affects reproduction of detail and saturated color pictures less detailed. In this paper, pre-compensation methods are proposed and their characteristics are analyzed. These methods have been tested by hardware, showing some amount of improvement for in-door programs or athletic programs. These methods have been proposed by the BTA (Broadcasting Technology Association) and by the Telecommunications Technology Council as the technologies of EDTV systems of Japan.

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