Projection-type image display system, projector, and image projection method for avoiding obstacles in the projection area
View Patent ↗To provide a projection-type image display system, a projector, a program, an information storage medium, and an image projection method that enable simple changing of a projection position, a liquid-crystal projector is provided with: a sensor which senses a projection target area and outputs sensing information; an edge detection section which outputs detection information, based on the sensing information; a projectable area determination section which determines a projectable area which has no obstructions within the projection target area, based on the detection information; a projection area selection section which selects a projection area within the projectable area, based on a user selection or a predetermined reference; a projection-area/pixel-area associating section and a lens adjustment section which performs predetermined adjustments in such a manner that an image is displayed on the projection area; and an image projection section which projects an image towards the projection area, based on the input image information.
1. A projection-type image display system comprising:
an image projection section that, based on calibration image signals, projects a black calibration image and a white calibration image sequentially onto a projection target area, or that projects nothing and the white calibration image sequentially, the white calibration image being projected at a maximum image size;
a sensing section that:
outputs black sensing information by sensing the projection target area when nothing is projected or sensing the black calibration image; and
outputs white sensing information by sensing the white calibration image;
a detection section that performs edge detection based on the black sensing information and outputs detection information that indicates edges in the sensed projection region;
a projectable area determination section that determines a projectable area within the projection target area, based on the detection information;
a projection area selection section that selects a projection area within the projectable area, based on a user selection or a predetermined reference;
an adjustment section that adjusts the image projection section so that the image projection section projects an image onto the projection area.
2. The projection-type image display system as defined by claim 1 , wherein the image projection section has a projection size adjustment section that adjusts a projection size, and
wherein the adjustment section outputs projection size control information to the image projection section so that the image is projected onto the projection area, the projection size control information being used for controlling the projection size adjustment section.
3. The projection-type image display system as defined by claim 2 , wherein the adjustment section determines an association between the projection target area and a pixel area of a spatial light modulator that is part of the image projection section, and adjusts the input image information in such a manner that a size of the image is adjusted.
4. The projection-type image display system as defined by claim 3 , further comprising:
a projection region detection section that detects a projection region, based on a difference between the black sensing information and the white sensing information, and
wherein the adjustment section determines the association between the projection target area and the pixel area of the spatial light modulator, based on the projection region detected by the projection region detection section and the projection area selected by the projection area selection section.
5. The projection-type image display system as defined by claim 1 , wherein the image projection section has a projection direction adjustment section that adjusts a projection direction, and
wherein the adjustment section outputs projection direction control information to the image projection section in such a manner that the image is projected onto the projection area, the projection direction control information controlling the projection direction adjustment section.
6. The projection-type image display system as defined by claim 1 , wherein the sensing section repeats the sensing and outputs the white and black sensing information at a predetermined timing, and
wherein the projectable area determination section determines the projectable area anew, based on a newest detection information.
7. A projection-type image display system comprising:
an image projection section that, based on calibration image signals, projects a black calibration image and a white calibration image sequentially onto a projection target area, or that projects nothing and the white calibration image sequentially, the white calibration image being projected at a maximum image size;
a sensing section that:
outputs black sensing information by sensing the projection target area when nothing is projected or sensing the black calibration image; and
outputs white sensing information by sensing the white calibration image;
a detection section that performs color distribution detection based on the black sensing information and outputs detection information that indicates color distribution in the sensed projection region;
a projectable area determination section that determines a projectable area within the projection target area, based on the detection information;
a projection area selection section that selects a projection area within the projectable area, based on a user selection or a predetermined reference;
an adjustment section that adjusts the image projection section so that the image projection section projects an image onto the projection area.
8. A projector comprising:
an image projection section that, based on calibration image signals, projects a black calibration image and a white calibration image sequentially onto a projection target area, or that projects nothing and the white calibration image sequentially, the white calibration image being projected at a maximum image size;
a sensing section that:
outputs black sensing information by sensing the projection target area when nothing is projected or sensing the black calibration image; and
outputs white sensing information by sensing the white calibration image;
a detection section that performs edge detection based on the black sensing information and outputs detection information that indicates edges in the sensed projection region;
a projectable area determination section that determines a projectable area within the projection target area, based on the detection information;
a projection area selection section that selects a projection area within the projectable area, based on a user selection or a predetermined reference;
an adjustment section that adjusts the image projection section so that the image projection section projects an image onto the projection area.
9. A projector comprising:
an image projection section that, based on calibration image signals, projects a black calibration image and a white calibration image sequentially onto a projection target area, or that projects nothing and the white calibration image sequentially, the white calibration image being projected at a maximum image size;
a sensing section that:
outputs black sensing information by sensing the projection target area when nothing is projected or sensing the black calibration image; and
outputs white sensing information by sensing the white calibration image;
a detection section that performs color distribution detection based on the black sensing information and outputs detection information that indicates color distribution in the sensed projection region;
a projectable area determination section that determines a projectable area within the projection target area, based on the detection information;
a projection area selection section that selects a projection area within the projectable area, based on a user selection or a predetermined reference;
an adjustment section that adjusts the image projection section so that the image projection section projects an image onto the projection area.
10. An image projection method comprising:
projecting, based on calibration image signals, a black calibration image and a white calibration image sequentially onto a projection target area, or projecting nothing and the white calibration image sequentially, the white calibration image being projected at a maximum image size;
outputting black sensing information by sensing the projection target area when nothing is projected or sensing the black calibration image; and
outputting white sensing information by sensing the white calibration image;
performing edge detection based on the black sensing information and outputting detection information that indicates edges in the sensed projection region;
determining a projectable area within the projection target area, based on the detection information;
selecting a projection area within the projectable area, based on a user selection or a predetermined reference;
adjusting an image projection section so that the image projection section projects an image onto the projection area.
11. The image projection method as defined by claim 10 , further comprising:
controlling the image projection section to adjust a projection size so that the image is projected onto the projection area.
12. The image projection method as defined by claim 10 , further comprising:
determining an association between the projection target area and a pixel area of a spatial light modulator that is part of the image projection section, and adjusting a size of the image.
13. The image projection method as defined by claim 10 , further comprising:
controlling the image projection section to control a projection direction in such a manner that the image is projected onto the projection area.
14. The image projection method as defined by claim 10 , further comprising:
repeating the sensing and outputting the black and white sensing information at a predetermined timing; and
determining the projectable area anew, based on the newest detection information.
15. An image projection method comprising:
projecting, based on calibration image signals, a black calibration image and a white calibration image sequentially onto a projection target area, or projecting nothing and the white calibration image sequentially, the white calibration image being projected at a maximum image size;
outputting black sensing information by sensing the projection target area when nothing is projected or sensing the black calibration image and outputting white sensing information by sensing the white calibration image;
performing color-distribution detection based on the sensing information and outputting detection information that indicates color distribution in the sensed projection region;
determining a projectable area within the projection target area, based on the detection information;
selecting a projection area within the projectable area, based on a user selection or a predetermined reference;
adjusting an image projection section so that the image projection section projects an image onto the projection area.