In this paper, we estimated the sensitivity information received from the image, and examined the possibility of the application of the image retrieval. We analyze the sensitivity information received from the landscape image by the based on Semantic Differential evaluation experiment. As the result, four meaningful factors are obtained. Then, by using the multiple regression and potential interpolation, we estimated the value of sensitivity information factors from image characters which are average value of the CIE L^*a^*b^* color space, color histgram, sensitivity information of color and texture characters. Furthermore, we construct the image retrieval system based on the sensitivity words. This system utilize the sensitivity information as the indexing.
Year by year, diplaying device like LCD display improves its resolution and pixel numbers. But naturally, its display area size is limited. Therefore its dsplaying area is always limited, a displaying method for oversized contents is desired. Usually, a scrolling method is used for such situation, however, it may not the best way because of its machine to man direction design. We proposed a displaying method based on human action and compared it with conventional scrolling method, then we found that the proposed method has big advantages than the scrolling method to display bigger image with small displaying screen. We hope that more efective displaying device could be realized based on the proposed method.
We study how the visual system groups local features extracted by early visual processes in order to determine global attributes of an object, specifically the global orientation of a bar in the presence of another intersecting bar that evokes the tilt illusion. Our psychophysical studies suggest that early visual processes, probably in V1, are involved in the neural grouping, and that the orientation information around the bar junction does not contribute to the apparent tilt. We then investigate computationally the cortical mechanism for the grouping by a V1 network model including long-range horizontal connections evident in superficial layers. The results show that the activities of V1 cells are grouped together excluding the junction region because of colinear synchronization. The model shows good quantitative agreement with human responses to tilt illusions consisting of various bar junctions
In the Poggendorf illusion, a rectangle on a straight line makes the two line segments appear misaligned. We investigated the Poggendorf configuration formed with real image and illusory image stereoscopically; we found that discrepancy perceived is changed according to the depth difference between the rectangle element and the line element. In addition, the misalignment could be perceived without physical interaction between the inducing rectangle and two line segments. Comparing the magnitude of the Poggendorf illusion in different configuration with and without interaction; then, different perceptual mechanism could be expected between them.
To consider the quality of service for stereoscopic image, it is necessary to develop a quality evaluation method for coded stereoscopic color image. We perform the sujective evaluation of the quality degration for the stereoscopic image. By using the MOS derived from this evaluation experiment, we consider the influence of the attentive eye. As the result, the total quality of the stereoscopic image is falling down when the quality of the left image and the right image has some difference.
First, we evaluate the impression of 3D HDTV images using some adjectives, and divide the adjectives into groups according to the correlations among them. We pick up two factors [sense of presence][ease of viewing] representing the groups. Secondly, we apply principal component analysis to the parallax distribution of the stereoscopic images used in the former subjective evaluation tests, in order to extract the features of the parallax distribution. Finally, we examine the correlations between factors and the features of the parallax distribution. As a result, the features of the parallax distribution have a strong correlation with ease of viewing and have no correlation with sense of presence.
To investigate visual fatigue induced by watching stereoscopic TV, we studied the changes in the fusional vergence limits or diplopia threshold and it's hysteresis, after 12 subjects watched stereoscopic high-definition TV for one hour. The key results were as follows: (1) Subjects who could perceive a stereogram by free fusion had a wider fusional vergence limits than those who could not. (2) After watching stereoscopic HDTV, the fusional vergence limits and it's hysteresis showed a significant decrease and recovered after rests. This suggests that the decrease in the fusional vergence limits and it's hysteresis can provide an index of visual fatigue. (3) The ratio of hysteresis in fusional vergence limits showed little change. This suggests the fatigue or the adaptation of the eye movement control system by watching stereoscopic TV.
Recently, problems on motion sickness occurred by high sensation of reality images and a bad influence of that upon the health are pointed out. In order to clear relationship between discomforts in motion sickness occurred by visual wide-field motion images and autonomic responses, ECG, a respiration and a body sway were discussed in presentation of three different motion of images. As a result, rotational, quickly changing and stationary images affected mainly an averaged respiration frequency, an averaged hart rate and distances of a body sway, respectively.