Mamoru Takamatsu

A Study on Approach Speeds of the Hands under Metal Press Machine Operation

The study described herein entailed measuring approach speed of the hands under simulated press machining conditions using two types of safety devices. A total of eight subjects were used in the experiment: four males in their twenties and four males in their fifties. Hand speed was faster for the photoelectric safety device (PSDI) than for safety devices activated using both hands (TWO) for both subject groups, in excess of 1.6 m/sec. The study showed that safety devices capable of automatic detection such as PSDI safety device more effectively ensure safety and work efficiency than the TWO type.

Fundamental Study about the Landscape Estimation and Analysis by CG

In recent years, the color of advertising signboards or vending machines on the streets should be harmonized with the surrounding landscape. In this study, we investigated how the colors (red and white) of the vending machines virtually installed by CG would affect the traditional landscape. 20 subjects estimated landscape samples in Hida-Furukawa by the SD technique. The result of our experiment shows that the vending machines have great influence on the surrounding landscape. On the other hand, we have confirmed that they can harmonize with the circumference landscape by the color to use.

Study on influence of the visibility in store lighting

Human is earned the information of 80% with eye. If the object of appearance is changed, impression felt by human also is changed. The store is illuminated objects with lighting, different types of lighting was gave various impression to consumer. In store, lighting method, equipment and design are devised with human visibility. Visual information is affected to the consumer appetite. This study was focused on store lighting at supermarkets, aimed to digitalize and quantify the effects of the visibility on foods. From this result, it had been clarified that the optimum color temperature for each food were variant. Lighting with the optimum color temperature can make enhance the feature of food. Therefore, improvement of visibility was raised consumer appetite.

Psychophysical evaluation of color rendering effect for landscape lighting in a snowy region

Today, the importance of the landscape lighting of urban nightscapes is increasing with the urban lifestyle for a 24-hour-life. In this study, we tried to quantitatively evaluate the color rendering effect for landscape lighting using visual engineering and psychophysical measurement methods. We selected six kinds of typical urban landscape lighting as samples. We took photographs of these nightscape. We made other samples which landscape lighting color changed to “red”, “orange”, “yellow”, “white” or “sky-blue” using computer, and presented to subjects. We applied SD technique to the evaluation for these samples. From the results, we found that the landscape lighting of “red” and “orange” provided an active impression to the urban nightscape. On the other hand, the landscape lighting of “sky-blue” provided a beautiful impression to the urban nightscape

Evaluating cataractous color sensitivity in HSV color system

Colors used in VDT are sometimes inappropriate for the person with symptoms of cataract. This is partly because RGB (HSV) color system is adopted in computer graphics, while industrial standards are commonly enacted by CIE color system. We conducted the experiment to evaluate the effect of cataract on the sensitivity of color vision by photochromatic threshold method and brightness matching method using cataract experiencing goggles. As a result, sensitivity turned relatively low in the HSV hue region from 210 to 270 degrees in the cataractous vision environment. This result is also proved by the calculation transforming HSV brightness V into CIE lightness L*. Therefore, it becomes clear that, to people with symptoms of cataract, liquid crystal display (LCD) low visibility might occur when blue or blue-region color is used as foreground against a black background.

Psychophysical estimation of 3D virtual depth of united, synthesized and mixed type stereograms by means of simultaneous observation

Recently, many types of computer-generated stereograms (CGSs), i.e. various works of art produced by using computer are published for hobby and entertainment. It is said that activation of brain, improvement of visual eye sight, decrease of mental stress, effect of healing, etc. are expected when properly appreciating a kind of CGS as the stereoscopic view. There is a lot of information on the internet web site concerning all aspects of stereogram history, science, social organization, various types of stereograms, and free software for generating CGS. Generally, the CGS is classified into nine types: (1) stereo pair type, (2) anaglyph type, (3) repeated pattern type, (4) embedded type, (5) random dot stereogram (RDS), (6) single image stereogram (SIS), (7) united stereogram, (8) synthesized stereogram, and (9) mixed or multiple type stereogram. Each stereogram has advantages and disadvantages when viewing directly the stereogram with two eyes by training with a little patience. In this study, the characteristics of united, synthesized and mixed type stereograms, the role and composition of depth map image (DMI) called hidden image or picture, and the effect of irregular shift of texture pattern image called wall paper are discussed from the viewpoint of psychophysical estimation of 3D virtual depth and visual quality of virtual image by means of simultaneous observation in the case of the parallel viewing method.

Psychophysical effect of retouched and modified digital stereograms for binocular vision on depth perception

A stereogram differs from the 3D picture often called stereo pair in appearance. There is no need of special viewer or glasses for stereopsis when viewing the sterograms. It is possible to intuitively carry out the intuitive estimation of depth perception by simultaneously viewing two pairs of stereograms which are arranged the upper and lower sides, or the right and left sides. In this study, modified digital color stereograms are directly viewed on the LCD screen or hard copy images by means of (a) crossing view method or (b) parallel view method. The apparent depth perception of stereograms can be effectively demonstrated by an adjustment of the viewing distance between the eye position of an observer and the plane of a stereogram rather than by altering the size and its arrangement of basic patterns which construct the plane images for steropsis. The visual effect of depth perception in the modified digital stereogram using sharpening filtering operation are discussed in connection with the modified various stereograms under the specified conditions: the number of pixel resolution and color bit levels.

Consideration of Quality Evaluation Model for Stereoscopic Pictures of Disparate Quality in Object and Background Area( Human Information)

The influence that picture quality differences give to the perceived overall quality of the picture is examined when a stereoscopic picture is of a disparate quality in object and background area, . A subjective assessment test used pictures for evaluation made by encoding several parameters. These pictures showed differences in stereoscopic objects and other background areas. The picture quality of the objects and the background areas was defined based on a the subjective assessment score, and an estimation method for assessing the overall picture quality was examined using the assessment scores. An objective picture quality evaluation model, constructed without using the original picture was also examined.

Visual appearance effect on modified reconstruction color images of optical Fourier transform hologram by means of digital image processing

A blue white He-Cd laser composed of three R/G/B component beams in place of He-Ne laser is directly applied to fabricate the optical Fourier transform hologram (OFTH) using the red sensitive silver halide material (SO-253 film) for holography. As a result, the red beams play an important role as the coherent beams in the fabrication of OFTH. A green solid state laser is applied to fabricate the OFTH using the same film for holography. The visual appearance of reconstruted color images caused by He-Cd laser is discussed in contrast to that of an ordinary OFTH which can be made using the He-Ne laser and solid state laser. The visual color effect using the He-Cd laser is checked from the viewpoint of the relative real size and its place in the OFTH, and the visual depth sensation of overlapped ghost images called cross-talk in the Fresnel hologram. The purpose using a commercially available software such as HSL color model is to carry out the intuitive modification of overlapped and deteriorated color images in the digital reconstruction of OFTH and Fresnel hologram.

Evaluation and Analysis of Traditional Town Landscape by Computer Graphics: Influence on Surrounding Landscape by Vending Machines@@@自動販売機による景観への影響について

In recent years, it has been viewed that the color of advertising signboards or vending machines on streets should be harmonized with the surrounding landscape. In this study, we investigated how (red and white) vending machines virtually installed into a scene by using CG would affect a traditional landscape. In addition, we investigated the harmony of the vending machine with the surrounding landscape and compared different cases in which there was advertisements or nothing. Landscape Cc;s with without vending machines of Hida-Takayama and Hida-Furukawa were evaluated by 20 subjects by using SD techniques. The results of our experiments show that the vending machines have a great influence on the surrounding landscape. On the other hand, we confirmed that they could be harmonized with the landscape if the right colors were used for their paint scheme.