Abstract: An image display device is capable of realizing an effective corrected shape of the image. The image display device includes an image input section to which an image is input, an aspect ratio determination section adapted to determine an aspect ratio of the image input to the image input section, a correction section adapted to perform a correction on the image input to the image input section so that the image has an aspect ratio corresponding to an aspect ratio determined by the aspect ratio determination section, and a projection section adapted to project the image on which the correction is performed by the correction section.

Abstract: A second projector projects and displays a measurement pattern on a projection screen while a first projector projects and displays another measurement pattern on the projection screen. The second projector causes an imaging unit to acquire a captured image including projection images of the two measurement patterns are captured, and detects coordinates of measurement points which are represented in the measurement patterns from the captured image. The second projector corrects the projection target image based on the coordinates such that the projection image by the first projector and its own projection image are in a desired relationship.

Abstract: A projector including: an adjustment image generation section which generates an adjustment image which allows adjustments of brightness and color difference; an input section to which operation information is input; an adjustment information generation section which generates brightness adjustment information indicating an adjustment value of the brightness and color difference adjustment information indicating an adjustment value of the color difference based on the operation information; and an adjustment section which adjusts the brightness and color of an image based on the brightness adjustment information and the color difference adjustment information.

Abstract: A correction information calculator in which a plurality of projectors each including an image forming element collaboratively displays one image on a projection surface, wherein based on predetermined correction information which is set in advance as a correspondence between the coordinates of pixels on the image forming element and the coordinates of pixels on a first effective projection region of the projection surface on which the image is presently displayed and a second correspondence which is a correspondence between the coordinates of the pixels on the first effective projection region and the coordinates of pixels on a second effective projection region of the projection surface, which is specified as a region on which the image is to be displayed, correction information representing a correspondence between the coordinates of pixels on the image forming element and the coordinates of pixels on the second effective projection region is calculated.

Abstract: A projector that acquires evaluation values representing how well projection light is brought into focus on a screen, outputs the acquired evaluation values and a maximum value of the acquired evaluation values, and updates the maximum value to a new value at a predetermined timing.

Abstract: A measurement pattern having a predetermined shape and L-shaped black areas are superimposed and output to a liquid crystal panel, and a pattern is detected from a taken pattern image. Lines are detected based on an image of a screen frame in the pattern image, and coordinate conversion factors for conversion of camera coordinates in the taken image into panel coordinates are calculated based on panel coordinate values of the pattern and camera coordinate values of the pattern detected from the pattern image. Then, apexes of the screen frame in the panel coordinates are obtained based on the lines and the conversion coordinate factors detected with respect to each corner, correction values are calculated, and trapezoidal distortion correction is performed.

Abstract: There is provided a gamma curve adjustment device used to adjust the gamma curve indicating the relationship of input tone values to output tone values for use in a gamma correction circuit that performs gamma correction of an image signal. The gamma curve adjustment device includes a user interface module that permits a user to specify desired output tone values for a plurality of pre-established adjustment points on the gamma curve, and an adjustment module that adjusts the gamma curve such that the output tone value at each adjustment point assumes the value specified through the user interface module. The plurality of adjustment points are established such that a differential of input tone values between a first set of two adjustment points situated adjacently on the gamma curve differs from a differential of input tone values between a second set of two adjustment points situated adjacently on the gamma curve.

Abstract: A correction information calculating device includes: a position information acquiring unit that acquires position information representing a position corresponding to a first diagram located inside a first photographed image; a second diagram position detecting unit that detects a position of a second diagram, that is different from the first diagram in at least one of a shape and a size, inside a second photographed image; and a correction information calculating unit that calculates correction information representing a correspondence relationship between a position of a pixel on the projection surface and a position of a pixel of an image forming element of a projector by comparing the position of the second diagram inside the second photographed image that is detected by the second diagram position detecting unit and the position of the second diagram on an original data of the second measurement image.

Abstract: A projection display device includes: a projection section having an optical system; a parameter obtaining section adapted to obtain a first parameter corresponding to the projection angle showing a relative posture of the projection display device to the projection surface; a vanishing point calculation section adapted to calculate a position of a vanishing point based on the first parameter; an actual zoom ratio obtaining section adapted to obtain an actual zoom ratio; a parameter calculating section adapted to correct the first parameter based on a fixed reference zoom ratio and the actual zoom ratio to thereby calculate a second parameter; and a keystone correction section adapted to perform a keystone correction of the image based on the fixed reference zoom ratio and the second parameter.

Abstract: A projector displays an image on a projection surface. The projector has a zoom adjusting module and a keystone correcting module. The zoom adjusting module adjusts zoom level of a zoom lens for enlarged projection of image light. The keystone correcting module corrects trapezoidal distortion of the image displayed on the projection surface by means of forming the effective panel image in a revised image formation area, the revised image formation area being part of the image formation area of the panel surface.

Abstract: A method of measuring a zoom ratio of a projection optical system adapted to project image light representing an original image on a projection screen, the method includes: (a) projecting and displaying a measuring image including a measurement point on the projection screen so that the measurement point is displayed at a position with an offset from an optical axis of the projection optical system; (b) detecting a projected measurement point, which is the measurement point projected and displayed on the projection screen, from a measurement point detection position having a fixed position relative to the projection optical system; and (c) determining the zoom ratio using position information of the detected projected measurement point and correspondence between the position information and the zoom ratio, the correspondence being prepared previously.

Abstract: A projector includes: capturing section that images an object on which an image is projected to produce a captured image; a projection distance information generating section that generates projection distance information representing a projection distance, which is the distance to the object on which an image is projected; a judging section that judges based on the projection distance information whether the projection distance exceeds a reference value; and a correcting section that performs trapezoidal distortion correction based on boundary lines of the object on which an image is projected contained in the captured image when the projection distance exceeds the reference value, whereas performing trapezoidal distortion correction based on at least coordinate information representing three-dimensional coordinates of the object on which an image is projected when the projection distance does not exceed the reference value.

Abstract: A projection-type display apparatus that projects an image toward a projection surface and displays the image thereon, the apparatus includes: a projecting section that includes a focal length adjusting mechanism and projects an image; an adjustment image controlling section that uses the projecting section to project a guide display image suggesting how to adjust the position where the projection-type display apparatus is installed and uses the projecting section to project a calibration image having a predetermined shape when the guide display image is projected; a projection distance measuring section that measures a projection distance that is the distance to the projection surface based on a captured image obtained by capturing the calibration image; and a focus adjusting section that operates the focal length adjusting mechanism based on the projection distance to perform focus adjustment so that the displayed guide display image is brought into focus.

Abstract: A projection display apparatus for displaying an image on a projection plane by projection, includes: an image capturing unit capturing an image; an angle calculator calculating an angle of the projection plane relative to the projection display apparatus; a straight line detector detecting a straight line in the captured image corresponding to a line perpendicular to a predetermined reference plane and a straight line in the captured image corresponding to a line parallel to the predetermined reference plane on the basis of the calculated angle; and a keystone corrector correcting a keystone distortion of an image to be displayed on the projection plane on the basis of the detection result in the straight line detector.

Abstract: A projection display apparatus for displaying an image on a projection plane by projection, includes: an image capturing unit capturing an image; an angle calculator calculating an angle of the projection plane relative to the projection display apparatus; a straight line detector detecting at least one reference line segment in the captured image; a line segment complementing section setting at least one complementary line segment in the captured image on the basis of the calculated angle so that an area on the projection plane corresponding to an area defined by the reference line segment and the complementary line segment is rectangular; and a keystone corrector correcting a keystone distortion of an image displayed on the projection plane on the basis of the reference line segment and the complementary line segment.

Abstract: A method of measuring a zoom ratio of a projection optical system adapted to project image light representing an original image on a projection screen, the method includes: (a) projecting and displaying a measuring image including a measurement point on the projection screen so that the measurement point is displayed at a position with an offset from an optical axis of the projection optical system; (b) detecting a projected measurement point, which is the measurement point projected and displayed on the projection screen, from a measurement point detection position having a fixed position relative to the projection optical system; and (c) determining the zoom ratio using position information of the detected projected measurement point and correspondence between the position information and the zoom ratio, the correspondence being prepared previously.

Abstract: A projector displays an image on a projection surface. The projector has a zoom adjusting module and a keystone correcting module. The zoom adjusting module adjusts zoom level of a zoom lens for enlarged projection of image light. The keystone correcting module corrects trapezoidal distortion of the image displayed on the projection surface by means of forming the effective panel image in a revised image formation area, the revised image formation area being part of the image formation area of the panel surface.

Abstract: A method of measuring a zoom ratio of a projection optical system adapted to project image light representing an original image on a projection screen, the method includes: (a) projecting and displaying a measuring image including a measurement point on the projection screen so that the measurement point is displayed at a position with an offset from an optical axis of the projection optical system; (b) detecting a projected measurement point, which is the measurement point projected and displayed on the projection screen, from a measurement point detection position having a fixed position relative to the projection optical system; and (c) determining the zoom ratio using position information of the detected projected measurement point and correspondence between the position information and the zoom ratio, the correspondence being prepared previously.

Abstract: A projector includes a projection section which projects a calibration image onto a projection target through a projection panel, a shape determination section which determines a shape of the projection target, a correction target area setting section which sets a correction target area, an aspect ratio calculation section which calculates an aspect ratio of the correction target area, a determination section which determines whether or not a value which indicates a difference between the aspect ratio of the correction target area and a reference aspect ratio satisfies a set condition, and an image generation section which generates an image having the shape of the correction target area on the projection panel when the set condition is satisfied, and generates an image having the reference aspect ratio on the projection panel when the set condition is not satisfied.

Abstract: The projector comprises an image forming panel that forms an effective panel image for modulating the light into an image light in an image forming area of a panel surface, and an image capturing unit for capturing a specific projection area wherein the image light corresponding to a specific area in the image forming area is projected. The projector calculates one or more edges of the outside perimeter lines of the screen and of the specific projection area by detecting plural points in a captured image. Based on the detection results, a post-correction image forming area is calculated, and trapezoidal distortion is corrected by forming the effective panel image within the post-correction image forming area. When only three or less of the four edges of the outside perimeter lines of the screen are detected, the projector calculates the post-correction image forming area based on the position and slope of the detected edge within the captured image.