초록 ▼

A projector includes an image projection section which projects a white image and a black image, a sensor which has an exposure adjustment function, generates first sensing information by sensing the white image, and generates second sensing information by sensing the black image, a sensing conditio

A projector includes an image projection section which projects a white image and a black image, a sensor which has an exposure adjustment function, generates first sensing information by sensing the white image, and generates second sensing information by sensing the black image, a sensing condition setting section which controls exposure of the sensor so that the sensor senses the white image at an automatic exposure setting and senses the black image at the exposure setting determined when sensing the white image, a difference information generation section which generates difference information based on the first sensing information and the second sensing information, and an endpoint detection section which detects an endpoint of a projection region in a sensing region based on the difference information.

대표청구항 ▼

What is claimed is: 1. An image processing system comprising: image projection means for projecting first and second calibration images at different timings; sensing means, having an exposure adjustment function, for generating first sensing information and second sensing information by sensing eac

What is claimed is: 1. An image processing system comprising: image projection means for projecting first and second calibration images at different timings; sensing means, having an exposure adjustment function, for generating first sensing information and second sensing information by sensing each of the projected first and second calibration images; difference information generation means for generating difference information which shows a difference in a predetermined image signal value for each pixel in each of the first and second calibration images in a sensing region of the sensing means based on the first sensing information and the second sensing information; and endpoint detection means for searching the difference information as search target and for detecting an endpoint of a projection region in the sensing region, wherein the sensing means senses the first calibration image at an automatic exposure, and the sensing means senses the second calibration image at an exposure state determined when sensing the first calibration image. 2. An image processing system comprising: image projection means for projecting first and second calibration images at different timings; sensing means, having an exposure adjustment function, for generating first sensing information and second sensing information by sensing each of the projected first and second calibration images; difference information generation means for dividing a predetermined pixel region in a sensing region of the sensing means into pixel blocks each of which is formed of a plurality of pixels, for generating first pixel block preprocessing information and second pixel block preprocessing information which show an average value or sum of a predetermined image signal value of each of the pixels or the predetermined image signal value of a representative pixel in each of the pixel blocks based on the first sensing information and the second sensing information, for setting a pixel region which becomes a reference for an endpoint of a projection region in the sensing region based on a difference between the first pixel block preprocessing information and the second pixel block preprocessing information, and for generating difference information which shows a difference in the predetermined image signal value for each of the pixels near the pixel region based on the first sensing information and the second sensing information; and endpoint detection means for searching the difference information as search target and for detecting the endpoint of the projection region in the sensing region, wherein the sensing means senses the first calibration image at an automatic exposure, and the sensing means senses the second calibration image at an exposure state determined when sensing the first calibration image. 3. The image processing system as defined in claim 1, wherein the image projection means projects a single-color white calibration image as the first calibration image, and projects a single-color black calibration image as the second calibration image. 4. The image processing system as defined in claim 1, wherein the difference information generation means generates a differential image between a first sensing image expressed by the first sensing information and a second sensing image expressed by the second sensing information as the difference information, wherein the differential image includes a center block region located near a center of the differential image, a peripheral block region located around the center block region, and a background region other than the center block region and the peripheral block region, and wherein each pixel in the center block region and the peripheral block region has a brightness index value differing from a brightness index value of each pixel in the background region. 5. The image processing system as defined in claim 4, wherein the endpoint detection means includes: center reference position detection means for detecting a plurality of center reference positions of the center block region in the sensing region of the sensing means based on the differential image; peripheral reference position detection means for detecting a plurality of peripheral reference positions of the peripheral block region in the sensing region based on the center reference position; and projection region information generation means for generating projection region information which shows the endpoint of the projection region based on the center reference positions and the peripheral reference positions. 6. The image processing system as defined in claim 5, wherein the projection region information generation means generates the projection region information by determining shape or arrangement of the center block region and the peripheral block region by setting a plurality of approximation lines or approximation curves based on the center reference positions and the peripheral reference positions. 7. The image processing system as defined in claim 6, wherein the projection region and the center block region are rectangular regions, and wherein the projection region information generation means determines positions of four corners of the center block region by detecting intersecting points of the plurality of approximation lines or intersecting points of the plurality of approximation curves, and generates the projection region information which shows positions of four corners of the projection region based on the positions of the four corners of the center block region. 8. An image processing system comprising: an image projection section which projects first and second calibration images at different timings; a sensing section, having an exposure adjustment function, which generates first sensing information and second sensing information by sensing each of the projected first and second calibration images; a difference information generation section which generates difference information which shows a difference in a predetermined image signal value for each pixel in each of the first and second calibration images in a sensing region of the sensing section based on the first sensing information and the second sensing information; and an endpoint detection section which searches the difference information as search target and detects an endpoint of a projection region in the sensing region, wherein the sensing section senses the first calibration image at an automatic exposure, and the sensing section senses the second calibration image at an exposure state determined when sensing the first calibration image. 9. An image processing system comprising: an image projection section which projects first and second calibration images at different timings; a sensing section, having an exposure adjustment function, which generates first sensing information and second sensing information by sensing each of the projected first and second calibration images; a difference information generation section which divides a predetermined pixel region in a sensing region of the sensing section into pixel blocks each of which is formed of a plurality of pixels, generates first pixel block preprocessing information and second pixel block preprocessing information which show an average value or sum of a predetermined image signal value of each of the pixels or the predetermined image signal value of a representative pixel in each of the pixel blocks based on the first sensing information and the second sensing information, sets a pixel region which becomes a reference for an endpoint of a projection region in the sensing region based on a difference between the first pixel block preprocessing information and the second pixel block preprocessing information, and generates difference information which shows a difference in the predetermined image signal value for each of the pixels near the pixel region based on the first sensing information and the second sensing information; and an endpoint detection section which searches the difference information as search target and detects the endpoint of the projection region in the sensing region, wherein the sensing section senses the first calibration image at an automatic exposure, and the sensing section senses the second calibration image at an exposure state determined when sensing the first calibration image. 10. A projector comprising: image projection means for projecting first and second calibration images at different timings; sensing means, having an exposure adjustment function, for generating first sensing information and second sensing information by sensing each of the projected first and second calibration images; difference information generation means for generating difference information which shows a difference in a predetermined image signal value for each pixel in each of the first and second calibration images in a sensing region of the sensing means based on the first sensing information and the second sensing information; and endpoint detection means for searching the difference information as search target and for detecting an endpoint of a projection region in the sensing region, wherein the sensing means senses the first calibration image at an automatic exposure, and the sensing means senses the second calibration image at an exposure state determined when sensing the first calibration image. 11. A projector comprising: image projection means for projecting first and second calibration images at different timings; sensing means, having an exposure adjustment function, for generating first sensing information and second sensing information by sensing each of the projected first and second calibration images; difference information generation means for dividing a predetermined pixel region in a sensing region of the sensing means into pixel blocks each of which is formed of a plurality of pixels, for generating first pixel block preprocessing information and second pixel block preprocessing information which show an average value or sum of a predetermined image signal value of each of the pixels or the predetermined image signal value of a representative pixel in each of the pixel blocks based on the first sensing information and the second sensing information, for setting a pixel region which becomes a reference for an endpoint of a projection region in the sensing region based on a difference between the first pixel block preprocessing information and the second pixel block preprocessing information, and for generating difference information which shows a difference in the predetermined image signal value for each of the pixels near the pixel region based on the first sensing information and the second sensing information; and endpoint detection means for searching the difference information as search target and for detecting the endpoint of the projection region in the sensing region, wherein the sensing means senses the first calibration image at an automatic exposure, and the sensing means senses the second calibration image at an exposure state determined when sensing the first calibration image. 12. A projector comprising: an image projection section which projects first and second calibration images at different timings; a sensing section, having an exposure adjustment function, which generates first sensing information and second sensing information by sensing each of the projected first and second calibration images; a difference information generation section which generates difference information which shows a difference in a predetermined image signal value for each pixel in each of the first and second calibration images in a sensing region of the sensing section based on the first sensing information and the second sensing information; and an endpoint detection section which searches the difference information as search target and detects an endpoint of a projection region in the sensing region, wherein the sensing section senses the first calibration image at an automatic exposure, and the sensing section senses the second calibration image at an exposure state determined when sensing the first calibration image. 13. A projector comprising: an image projection section which projects first and second calibration images at different timings; a sensing section, having an exposure adjustment function, which generates first sensing information and second sensing information by sensing each of the projected first and second calibration images; a difference information generation section which divides a predetermined pixel region in a sensing region of the sensing section into pixel blocks each of which is formed of a plurality of pixels, generates first pixel block preprocessing information and second pixel block preprocessing information which show an average value or sum of a predetermined image signal value of each of the pixels or the predetermined image signal value of a representative pixel in each of the pixel blocks based on the first sensing information and the second sensing information, sets a pixel region which becomes a reference for an endpoint of a projection region in the sensing region based on a difference between the first pixel block preprocessing information and the second pixel block preprocessing information, and generates difference information which shows a difference in the predetermined image signal value for each of the pixels near the pixel region based on the first sensing information and the second sensing information; and an endpoint detection section which searches the difference information as search target and detects the endpoint of the projection region in the sensing region, wherein the sensing section senses the first calibration image at an automatic exposure, and the sensing section senses the second calibration image at an exposure state determined when sensing the first calibration image. 14. An information storage medium storing a computer-readable program which causes a computer to function as: image projection means for projecting first and second calibration images at different timings; sensing means, having an exposure adjustment function, for generating first sensing information and second sensing information by sensing each of the projected first and second calibration images; difference information generation means for generating difference information which shows a difference in a predetermined image signal value for each pixel in each of the first and second calibration images in a sensing region of the sensing means based on the first sensing information and the second sensing information; and endpoint detection means for searching the difference information as search target and for detecting an endpoint of a projection region in the sensing region, wherein the sensing means senses the first calibration image at an automatic exposure, and the sensing means senses the second calibration image at an exposure state determined when sensing the first calibration image. 15. An information storage medium storing a computer-readable program which causes a computer to function as: image projection means for projecting first and second calibration images at different timings; sensing means, having an exposure adjustment function, for generating first sensing information and second sensing information by sensing each of the projected first and second calibration images; difference information generation means for dividing a predetermined pixel region in a sensing region of the sensing means into pixel blocks each of which is formed of a plurality of pixels, for generating first pixel block preprocessing information and second pixel block preprocessing information which show an average value or sum of a predetermined image signal value of each of the pixels or the predetermined image signal value of a representative pixel in each of the pixel blocks based on the first sensing information and the second sensing information, for setting a pixel region which becomes a reference for an endpoint of a projection region in the sensing region based on a difference between the first pixel block preprocessing information and the second pixel block preprocessing information, and for generating difference information which shows a difference in the predetermined image signal value for each of the pixels near the pixel region based on the first sensing information and the second sensing information; and endpoint detection means for searching the difference information as search target and for detecting the endpoint of the projection region in the sensing region, wherein the sensing means senses the first calibration image at an automatic exposure, and the sensing means senses the second calibration image at an exposure state determined when sensing the first calibration image. 16. An image processing method comprising: projecting a first calibration image; generating first sensing information by sensing the projected first calibration image at an automatic exposure setting; projecting a second calibration image; generating second sensing information by sensing the projected second calibration image at an exposure determined when sensing the first calibration image; generating difference information which shows a difference in a predetermined image signal value for each pixel in a sensing region based on the first sensing information and the second sensing information; and searching the difference information as a search target and detecting an endpoint of a projection region in the sensing region. 17. An image processing method comprising: projecting a first calibration image; generating first sensing information by sensing the projected first calibration image at an automatic exposure setting; projecting a second calibration image; generating second sensing information by sensing the projected second calibration image at an exposure determined when sensing the first calibration image; dividing a predetermined pixel region in a sensing region into pixel blocks each of which is formed of a plurality of pixels based on the first sensing information and the second sensing information; generating first pixel block preprocessing information and second pixel block preprocessing information which show an average value or sum of a predetermined image signal value of each of the pixels or the predetermined image signal value of the representative pixel in each of the pixel blocks; setting a pixel region which becomes a reference for an endpoint of a projection region in the sensing region based on a difference between the first pixel block preprocessing information and the second pixel block preprocessing information; generating difference information which shows a difference in the predetermined image signal value for each of the pixels near the pixel region based on the first sensing information and the second sensing information; and searching the difference information as a search target and detecting the endpoint of the projection region in the sensing region. 18. The image processing method as defined in claim 16, wherein the first calibration image is a single-color white calibration image, and the second calibration image is a single-color black calibration image. 19. The image processing method as defined in claim 16, wherein a differential image between a first sensing image expressed by the first sensing information and a second sensing image expressed by the second sensing information is generated as the difference information, wherein the differential image includes a center block region located near a center of the differential image, a peripheral block region located around the center block region, and a background region other than the center block region and the peripheral block region, and wherein each pixel in the center block region and the peripheral block region has a brightness index value differing from a brightness index value of each pixel in the background region. 20. The image processing method as defined in claim 19, comprising: detecting a plurality of center reference positions of the center block region in the sensing region based on the differential image; detecting a plurality of peripheral reference positions of the peripheral block region in the sensing region based on the center reference position; and generating projection region information which shows the endpoint of the projection region based on the center reference positions and the peripheral reference positions. 21. The image processing method as defined in claim 20, comprising: generating the projection region information by determining shape or arrangement of the center block region and the peripheral block region by setting a plurality of approximation lines or approximation curves based on the center reference positions and the peripheral reference positions. 22. The image processing method as defined in claim 21, wherein the projection region and the center block region are rectangular regions, and wherein the method includes determining positions of four corners of the center block region by detecting intersecting points of the plurality of approximation lines or intersecting points of the plurality of approximation curves, and generating the projection region information which shows positions of four corners of the projection region based on the positions of the four corners of the center block region.