You can put the walls of the patterns as the projector screen to use optical compensation technology days ago by Japan National Informatics Institute Assistant SATO IMARI and Tokyo University lecturers Sato and the ocean a research team to develop successfully. In a pattern of instrument with a projection on the wall projection image, usually on the walls of the patterns appear in the image, but if you use this new technology, you can eliminate the effects of the pattern, compared with the original method reduces the "bleaching" and "white" brightness of saturation and contrast. The technology applied to the projector, it does not need to prepare a special screen or wall. The research group said that the future can also mix with small portable projector, put the side wall and desktop use as a screen.
Figure 1: a pattern of the screen in Figure 2: no compensation. Screen patterns appear in the projected image in Figure 3: compensation. Into the image on the screen pattern has not noticed. And there is no compensation for the image (Figure 2) compared to almost feel no contrast changes. No picture on the screen, the looming and Figure 2-like water drops pattern Figure 4: combination of screen image after compensation patterns. Enter the image in Figure 5: the projector has a black and white stripes on the screen in Figure 6: no compensation figure 7: compensation. Black and white stripes compensation some difficulties
The trial production of the system can only be compensated to the picture. This system consists of LCD projector and digital cameras. Compensation using personal computers to read screen characteristics of prior calibration will take about 30-40 minutes, a picture of compensation may take several seconds to several tens of seconds. The group that you want to implement playback images per second when 30 image requirements, available through a dedicated image processing circuit.
Typically, you want to eliminate the influence of the pattern on the screen, in order to maintain the projection of the original image RGB values and projected on a screen image of people see the RGB values, you need to enter image projector compensation. For example, when because of the pattern and cause local albedo reduction, will the patterns for the low brightness increased input image brightness or lowered without pattern part of the input image's brightness to compensate. In addition, color, or only to a part of the projected compensation patterns to eliminate the pattern color, or to have no pattern of all parts of the projection and the same color for the pattern.
But with this approach, if the projector's enter the brightness of the image exceeds the limits of available output luminance on the projector, the original image with the gradient in brightness are all part of the white, the "white" phenomenon. Color too, such as when the projector to the input image in red color value exceeds the bounds of the output of the projector, the looks are red, occur "bleaching" phenomenon. In order to lower the picture quality and reduce the brightness of the pattern part other than for compensation, and will face lower the overall contrast of the image.
This method, in order to fix the screen pictorial effects while maintaining the contrast, leverages human vision in the color and brightness on characteristics. Human vision has such characteristics, such as "high-brightness or low luminance component, it is difficult to identify the brightness change," "slow changes is not easy to distinguish the" brightness, "in color, has a difficult to identify the range," and so on. So when the projection of images and the walls of the patterns together, even if there is a brightness differences or the phenomenon of white, and indeed sometimes the user does not feel. In addition, in considering the human vision system, the only part of the screen instead of the whole screen to compensate, you can display the assignment of user feel coordinated image. With the introduction of the above methods, compared to the original method can maintain compensation of high contrast. However, for compensation have black and white stripes on the screen or make a whole dark walls, illuminated, this approach also difficult.
The published results in theses have been adopted as part of the public. The thesis has been selected as June 2006 IEEE International Conference on the projector of the International Workshop on Projector Camera Systems (ProCams2006) of the best papers, was elected in July image recognition International Forum (MIRU2006) excellent paper.
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