Abstract: Provided is a projection lens assembly method in an oblique projection optical system, which enables efficient manufacture even if a size of an image display element to be mounted varies, and a projection type image display apparatus using the projection lens. The projection lens assembly method in the oblique projection optical system for an oblique type projection image display apparatus including a block of a spherical lens and a block of an aspherical lens includes: preparing in advance the block of the spherical lens having a size that adapts to image display elements having different sizes and incorporated in the projection image display apparatus, and the block of a common aspherical lens; and assembling the block of the spherical lens selected in accordance with the sizes of the incorporated image display elements and the block of the common aspherical lens to assemble the projection lens.

Abstract: A display control apparatus comprises a setting unit that sets a target overlap width with respect to an overlap region, in which at least two of adjacent projection images of a plurality of projection images projected by a plurality of projection devices overlap each other, an image obtaining unit that obtains a captured image obtained by capturing the plurality of projected projection images, a calculation unit that calculates the overlap width of the overlap region of the at least two adjacent projection images on the basis of the captured image, and an indicator generation unit that generates, on the basis of the overlap width, an adjustment indicator that guides a positional adjustment of the projection image such that the at least two adjacent projection images overlap each other by the target overlap width.

Abstract: One variation of method includes: serving setup frames to a projector facing a scene; at a peripheral control module comprising a camera facing the scene, recording a set of images during projection of corresponding setup frames onto the scene by the projector and a baseline image depicting the scene in the field of view of the camera; calculating a pixel correspondence map based on the set of images and the setup frames; transforming the baseline image into a corrected color image—depicting the scene in the field of view of the camera—based on the pixel correspondence map; linking visual assets to discrete regions in the corrected color image; generating augmented reality frames depicting the visual assets aligned with these discrete regions; and serving the augmented reality frames to the projector to cast depictions of the visual assets onto surfaces, in the scene, corresponding to these discrete regions.

Abstract: An image generation device includes an image generator, a stationary unit, and a diffusion heat radiator. The image generator receives light and generate an image. The stationary unit includes a stationary plate and a movable unit. The movable unit includes a movable plate and a diffusion heat radiator. The movable plate is movably supported at a plurality of support portions by the stationary plate. The image generator is mounted on the movable plate. The diffusion heat radiator is connected to the movable plate at a plurality of connection portions of the movable plate. Assuming that one of the support portions constitutes a pair with one of the connection portions closest to the one of the support portions, each of the connection portions constitutes the pair with a corresponding one of the support portions that not share the pair with any other connection portion of the connection portions.

Abstract: A virtual reality headset displays a three-dimensional (3D) virtual scene and includes a varifocal element to dynamically adjust a focal length of an optics block included in the virtual reality headset based on a location in the virtual scene where the user is looking. The headset tracks a user's eyes to approximate gaze lines and determines a plane of focus for a frame of the virtual scene as the intersection of the gaze lines. The varifocal element adjusts the focal length of the optics block so the optics block is focused at the plane of focus, which keeps the user's eyes in a zone of comfort as vergence and accommodation change. Based on the plane of focus, the virtual reality headset may provide depth cues, such as depth of field blur, to planes in the virtual scene deeper in the user's field of view than the plane of focus.

Abstract: To reduce pixel position deviations in a plurality of color component images projected by a projection unit, a projection apparatus obtains, concerning the plurality of color component images projected onto the projection surface, position information concerning a projection position of each of remaining color component images with reference to a projection position of one color component image, and performs image processing for at least one of the plurality of color component images based on the obtained position information.

Abstract: A projection type image display device (100) including a light source (40), an illumination optical system (30) which uniformly radiates light flux emitted from the light source (40) onto a surface (SCR) of an image modulation element which becomes a primary image surface, a projection optical system, capable of being set at a distance very close to a focal distance of a projection image, which magnifies and projects image information of the primary image surface modulated by the image modulation element onto a projection surface which becomes a secondary image surface, and a corner focus control section capable of automatically adjusting a focal distance of at least corner regions of the projection image to a focal distance corresponding to a projection distance of the projection image.

Abstract: An image processing device performs image processing on image data for projection into a projection area. The image processing device comprises a memory and an image processor. The memory at least temporarily stores image data. The image processor specifies a certain area that is part of the projection area and extends from one end of the projection area, and corrects the image data so as to satisfy a certain condition on the basis of the specification of the certain area. The certain condition is that the correction amount A for the brightness of the image data portion to be projected into the certain area and the correction amount B for the brightness of the other image data portion in the projection area satisfy the relation A<B.

Abstract: A projection system includes a projection unit, an optical path change unit, a capture unit, and a controller. The projection unit emits projection light for displaying an image. The optical path change unit changes an optical path for the projection light and guides the projection light toward a prescribed projection surface. The capture unit captures a projection image that is projected onto the projection surface from the optical path change unit, based on the image. The controller calculates a first distance that is a length from the projection unit to the optical path change unit along the optical path and a second distance that is a length from the projection unit to the projection surface along a vertical direction, based on the captured image by the capture unit, and controls the projection image based on the first distance and the second distance that are calculated.

Abstract: Disclosed is an interactive display system, comprising a main control unit for processing information, a display unit for generating a display image, one or more remote control units, and a monitoring module assembly; the main control unit has a communication connection with the display unit and the monitoring module assembly; each remote control unit comprises an infrared emission module assembly used to emit infrared light of two different wavelengths to the display image to generate an infrared light spot; the monitoring module assembly comprises a monitoring lens for capturing the infrared light spot within the display image, a first light splitting element, and a first and a second infrared monitoring element with respect to the different wavelength from the remote control. This disclosure provides multiple-point interaction on a single display image. User can easily interact with the display image just like the touch-panel which helps enhance interactive experience.

Abstract: An image displaying system is provided, including an image device, first and second carrying devices. The image device receives an external image message. The first carrying device has an accommodating space. An imaging assembly is disposed at one end of the first carrying device while a virtual-image imaging assembly is disposed at the opposite end. The second carrying device has a storage space. The image device may attach to the accommodating space. When triggered, the image device transforms the external image message into a reversed image message and then projects the reversed image message to the imaging assembly. The virtual-image imaging assembly projects the reversed image message of the imaging assembly to produce a first image. The image device may attach to the storage space such that it projects the external image message to a target to produce a second image.

Abstract: A system, method and computer readable medium for projecting images on a marked surface. The system includes a memory storage unit, a projector, a camera, an input device for receiving input data to align correspondence points in a template image with features on a marked surface, a computing device for calculating a correction model, and a rendering device for generating image data. The method involves projecting a template image to generate a camera image, receiving input data, calculating a correction model based on the input data and generating and projecting image data. The computer readable medium is encoded with codes to direct a processor to carry out the method.

Abstract: Briefly, in accordance with one or more embodiments, a MEMS scanned beam projector includes a light source to emit a light beam, a scanning platform to redirect the light beam impinging on the platform, and a display controller to control the light source and the scanning platform to cause the scanning platform to scan the light beam in a vertical direction and a horizontal direction in a scan pattern to project an image onto a projection surface. The display controller is configured to correct for image distortion in the projected image by providing a compensated drive signal to the scanning platform to compensate for the image distortion.

Abstract: A display processing device includes a focus control unit configured to control a focal length in at least a central area of a projection image in accordance with a user operation, the projection image being enlarged and projected from a projection optical system capable of setting the focal length of the projection image at a short range.

Abstract: A projection assembly comprising at least a first screen (14) and a second screen (10). The first screen (14) is at an angle with the second screen (10). The first screen (14) is adapted to reflect light projected onto it predominantly or exclusively in one or more angular ranges that do not intersect with the second screen (10). The invention also pertains to a method for projecting images with such a projection assembly, comprising projecting a first image with the first projector (16B) on the first screen (14), and projecting a second image with the second projector (16A) on the second screen (10).

Abstract: A light source device includes a plurality of first solid-state light emitting elements configured to emit first beams. a light splitting mirror provided in correspondence to the first solid-state light emitting elements and configured to split the first beams, which are incident from a first direction, by penetration and reflection, and a reflection mirror provided in correspondence to the light splitting mirror and configured to reflect one first beams split at the light splitting mirror in the same direction as the other first beams split at the light splitting mirror.

Abstract: A projection lens and a projection apparatus are provided. The projection lens has a screen side and an image side. The projection lens includes a first lens group, a second lens group, and a third lens group. The first lens group disposed between the screen side and the image side includes a first, a second, and a third lenses arranged sequentially from the screen side to the image side. The second lens group disposed between the first lens group and the image side includes a fourth, a fifth, a sixth, a seventh, an eighth, a ninth, and a tenth lenses arranged sequentially from the screen side to the image side. The third lens group disposed between the second lens group and the image side includes an eleventh and a twelfth lenses, and a distance between the twelfth lens and the light valve is a constant.

Abstract: An image processing device includes a selection section adapted to select a first correction point among a plurality of correction points included in a correcting image, an identification section adapted to identify a second correction point and a third correction point adjacent to the first correction point, and a display control section adapted to emphasize a first line segment connecting the first correction point and the second correction point to each other, and a second line segment connecting the first correction point and the third correction point to each other, and display the correcting image on a display section.

Abstract: There is provided an image processing method including detecting a distorted image before correction projected on a screen by a projection-type image display device, searching for a same shape as an input image having a maximum area inside the distorted image, and correcting the input image in a manner that the distorted image becomes the searched-for shape having the maximum area.

Abstract: A method of automatically focusing a projector in a projection system is provided that includes projecting, by the projector, a binary pattern on a projection surface, capturing an image of the projected binary pattern by a camera synchronized with the projector, computing a depth map from the captured image, and adjusting focus of the projector based on the computed depth map.

Abstract: A system for projecting 2D images, providing a computerized representation of a first, dense, grid of spatial 3D coordinates which respectively correspond to a set of time-points evenly distributed along a time-dimension with constant time-discretization; deriving a dense 2D representation of an image, whose coordinate pairs respectively correspond to said set of time-points; d. Defining a sparse 2D grid of second coordinate pairs, spaced such that distances between any two adjacent coordinate pairs along a row of said sparse 2D grid are constant; and finding, coordinate pairs closest to the second sparser grid to yield a third grid, and a laser controller to control the laser to project a digitally represented image, from said distance, timed to project pixels whose locations respectively correspond to the subset of uniformly distanced positions forming said third grid, thereby to prevent image distortion despite non-uniformity of micro-mirror's angular velocity.

Abstract: An image processing apparatus comprises a specification unit configured to, from a multi-screen display corresponding to multi-screen displays performed by a plurality of projection apparatuses, specify an overlapping region in which first and second projection regions for first and second projection apparatuses overlap; a determination unit configured to, based on the positions of the overlapping regions in the first and second projection regions, determine luminance correction coefficients corresponding to the overlapping region such that the luminance correction coefficient at a coordinate corresponding to a first vertex in the overlapping region and a luminance correction coefficient at a coordinate corresponding to a second vertex located diagonally opposite to the first vertex in the overlapping region are different; and a correction unit configured to correct luminance of image data for the multi-screen display, based on the determined correction coefficients.

Abstract: A projection device includes a projection unit including a display element in which pixel lines each formed by pixels arranged in a first direction are arranged in a second direction and an optical system that projects light emitted from the display element and projecting an image based on input image data, a first correction unit for correcting a scale of each line data of the image data that corresponds to each of the pixel lines, a second correction unit for correcting a second-direction scale of each pixel data of the image data after the correction performed by the first correction unit, and an image cutting-out unit for cutting out image data of an area, which is projected from the projection unit, of the image data after the correction performed by the second correction unit and input the image data of the area to the projection unit.

Abstract: Disclosed herein is a display device, including: a display panel having a display area having a plurality of pixels each composed of one or more sub-pixels, a first image and a second image being alternately displayed adjacent to each other in the sub-pixels, the first image and the second image being displayed in visual directions different from each other so as to be adapted to be discriminated from each other; and a crosstalk correcting portion having a crosstalk correcting table, configured to carry out crosstalk correction for images different from one another by using the crosstalk correcting table; wherein the display area is divided into a plurality of areas, and gamma correction which differs so as to correspond to the plurality of areas obtained through the division, respectively, is carried out for an image as an object of the crosstalk correction.

Abstract: A projector according to an aspect includes a light source device, a light modulation device adapted to modulate light from the light source device to form image light, a projection optical system adapted to perform tilted projection of the image light input from the light modulation device to display an image, and a guide display section adapted to display a guide image used for fitting the image projected by the projection optical system to a screen, the guide image is provided with a focus adjustment pattern forming area disposed in a central portion in a direction perpendicular to a tilt direction in a peripheral zone on the tilt direction side, and a focus adjustment pattern is formed in the focus adjustment pattern forming area.

Abstract: A projector includes a liquid crystal panel, an optical path shifting element which is capable of changing the optical path of light emitted from the liquid crystal panel, and an image processing unit. The optical path shifting element performs pixel shift such that light reaches different positions of a display screen in respective first to fourth unit periods acquired by dividing one frame into four parts. The image processing unit includes a conversion unit which converts a high resolution image signal into a low resolution image signal, and generates an output image signal by performing an overdrive process on the low resolution image signal according to a pixel shift state.

Abstract: An approach for re-identifying an object in a first test image is presented. Brightness transfer functions (BTFs) between respective pairs of training images are determined. Respective similarity measures are determined between the first test image and each of the training images captured by the first camera (first training images). A weighted brightness transfer function (WBTF) is determined by combining the BTFs weighted by weights of the first training images. The weights are based on the similarity measures. The first test image is transformed by the WBTF to better match one of the training images captured by the second camera. Another test image, captured by the second camera, is identified because it is closer in appearance to the transformed test image than other test images captured by the second camera. An object in the identified test image is a re-identification of the object in the first test image.

Abstract: A novel method of using optical flow algorithm that maximizes the benefit of optical flow synthetic frames while minimizing the associated computation cost is provided. When using optical flow to produce synthetic frames between two actual/recorded frames, the method computes a set of estimates of optical flows (or a flow estimate) between the two frames. These flow estimates are then used to compute all synthetic frames that are needed between the two actual frames by interpolation, which creates each synthetic frame based on its temporal distances from the pair of actual frames.

Abstract: The present disclosure proposes an image displaying method applied in an electronic device. The electronic device comprises a display unit and a projection unit. The display unit is placed on a first surface of the electronic device. The method comprises: determining data to be displayed when the projection unit is placed on a second surface of the electronic device opposite to the first surface; projecting, by the projection unit, the data to be displayed onto a carrier to present a first display image on the carrier, the first display image corresponds to a first part of the data to be displayed; displaying, by the display unit, a second part of the data to be displayed to display a second display image corresponding to the second part on the display unit. The present disclosure further proposes an electronic device.

Abstract: The projector includes alight source, a liquid crystal light valve that modulates first color component light based on a signal, a liquid crystal light valve that modulates second color component light from the light source based on a signal, a projection lens that projects a first image formed by the first color component light and a second image formed by the second color component light, an alignment image display control section that superimposes the first image and the second image on each other and projects the superimposed image to show position misregistration of the second image relative to the first image, an instruction input screen for shifting the second image as a whole, and an alignment adjustment section that determines correction information for correcting the position misregistration based on the shift instruction and corrects the signal based on the determined correction information.

Abstract: A method of displaying an image using at least a first projector and a second projector includes projecting a calibration pattern using the first projector, the calibration pattern being embedded in a first portion of an image projected by the first projector. The method determines a contribution of the second projector to projecting a second portion of the image to an overlap area, the overlap area having a contribution from the first and second projectors, wherein the contribution is an intensity of a color channel. The determined contribution of the second projector to the overlap area is modified to allow the calibration pattern of the first projector to be detectable to a capture device, the modification having a pattern corresponding to the calibration pattern. The image is then displayed using the first projector and the modified contribution of the second projector.

Abstract: Technologies for projecting a noncontinuous image onto at least a portion of a projection region using a projector of a projection device. The projection device is configured to determine one or more cut-out areas of the projection region. Each cut-out area defines an area within the projection region on which a corresponding portion of the image is not to be projected by the projector of the projection device. The projection device is further configured to update the projection region based on the cut-out area(s) and project, via the projector, the image onto the updated projection region, wherein no portion of the image is projected on cut-out area(s). Other embodiments are described and claimed.

Abstract: A multi-projector system includes two or more projection devices including a first projection device and a second projection device, an image output device configured to output an image to each of the two or more projection devices, and an adjustment device configured to adjust projection positions of projection images on a medium to be projected, the projection images being projected by the two or more projection devices, and a first projection image emitted by the first projection device, and a second projection image emitted by the second projection device being projected on the medium to be projected to have an overlapped region.

Abstract: A projector includes a projecting unit configured to project an image on a projection surface, a projection control unit configured to cause the projecting unit to project a correction pattern including a first pattern and a second pattern, and a correction control unit configured to detect the first pattern and the second pattern included in the projected correction pattern and correct distortion of the projected image. The correction control unit detects the second pattern projected on a screen and detects the position of the first pattern on the basis of the position of the detected second pattern.

Abstract: A projector system includes an image generator and at least one projector for receiving an image from the image generator and projecting the image onto a screen to provide a final projected image. A computer generates correction data based on a calibration process that includes comparing an uncorrected image projected by the at least one projectors with a geometrically correct image. Wherein the at least one projector maps incoming pixel locations from the image generator to corrected pixel locations in the final projected image based on the correction data.

Abstract: A projection apparatus and an image calibration method thereof are provided. The image calibration method of the projection apparatus includes: transmitting N optical pulse signals to N calibration reference points on a projection plane respectively, wherein N is greater than or equal to 2; receiving N reflected optical pulse signals that are generated by reflecting the optical pulse signals; and respectively calculating time intervals between pulse waves of the optical pulse signals and the corresponding reflected optical pulse signals to obtain N time differences, thereby performing an image calibration.

Abstract: An auto-focusing projection system includes a projection module, an infrared monitoring module (300), an infrared source (400) provided on the projection module, and a focusing device for driving the first lens group (201) moving forward and backward. An IR light spot emitted from the infrared source falls within the monitoring scope of the infrared monitoring module, preferably inside the projected picture of the projection module or on the edge thereof, and after reflected back, it also can travel through the first lens group, and the splitting element in turn, and then be transmitted to the infrared monitoring module. Analyzing the IR light spot picture emitted from the infrared source which is collected by the infrared monitoring module, a control signal can be sent to a focusing motor to adjust the first lens group to an appropriate position, so as to realize auto-focusing.

Abstract: A method, system, and/or computer program product enables the sharing of an overlapping area on a shared projection. A system detects an overlapping area on a shared projection, which presents content from a first projection and a second projection. A computing device identifies any redundant resources, which perform the same function as one another, in the first projection and the second projection. A consolidated resource, which provides the same function as the redundant resources, is defined and/or created, and then displayed in the overlapping area.

Abstract: The invention provides a system and method that reduces the tediousness of the manual alignment process. Users select correspondences between projectors or components of a projector, to form a common coordinate. Using models of the display system, and projectors, the common coordinate system can be mapped quickly to the entire display. The process avoids a need to measure screen points, and allows the user to move significantly fewer points. Alternatively, the invention allows introduction of machine-vision style algorithms into manual calibration techniques to improve performance. This overcomes the tediousness of prior systems by introducing models of the display into the manual alignment process, allowing selection of a small number of points on each projector, and avoiding selection of precisely measured screen points. The system conversely finds correspondences between projectors, allowing mapping of the projectors into a common coordinate system, and quick warping of the coordinate system to the screen.

Abstract: A pico projection fixing module includes a bracket main body, at least two collimator lenses, and at least two color light sources. The bracket main body includes an upper part, a lower part, a connecting part and at least two assembling seats. The upper part and the lower part are located at bilateral sides of the connecting part. Each of the assembling seats includes an opening and a clamping part. The opening is formed on the connecting part. The clamping part is disposed on the upper part and the lower part. The at least two collimator lenses are installed on the connecting part and corresponded to the corresponding openings. The at least two color light sources are installed on the corresponding clamping parts and aligned with the corresponding collimator lenses. The clamping parts corresponding to the assembling seats are separated from each other.

Abstract: Systems and methods for calibrating a 3D display system. In one embodiment, a system includes a display screen, 2D image projectors that project 2D projection images onto the screen and a camera that captures calibration images of the screen. A computer generates the 2D projection images, which include calibration patterns, and processes the captured calibration images. The computer uses the calibration images to calculate corrections based upon the calibration images. The computer can then generate corrected 2D projection images that are projected by the 2D image projectors onto the screen to produce a substantially visually correct 3D image with continuous viewing, true horizontal parallax, and a different view for each eye within a valid viewing zone. The corrections to the images may include corrections to the geometry (including distortion, alignment, etc.) color (including intensity and related parameters).

Abstract: The present invention provides a method whereby the spatial relationship and orientations of one or more three-dimensional objects being illuminated by an optical projector, and the optical projector itself, can be very accurately defined both quickly and easily. The present invention also provides a novel computerized optical projection system whereby three-dimensional data when viewed by the human eye projected onto three-dimensional objects is not deformed as a result of the non-planar projection surface. In one embodiment, the invention provides computerized optical assembly or manufacturing guidance systems, and related methods, that provide step-by-step assembly or manufacturing instructions for instructing technicians how to assemble or manufacture three-dimensional objects or systems.

Abstract: An image projection apparatus for generating a projection image based on image data input to the image projection apparatus and projecting the projection image onto a projection face includes a correction unit to correct the projection image, a synthesis image projection unit to superimpose a superimposition image on the projection image corrected by the correction unit to generate a synthesis image and project the synthesis image onto the projection face, and an image capturing unit to capture the synthesis image projected on the projection face. The synthesis image projection unit changes a display position of the superimposition image to fit the superimposition image within a display area of the synthesis image by referring an image of the synthesis image captured by the image capturing unit, and projects the synthesis image after changing the display position of the superimposition image.

Abstract: A drive assistance device has an imaging device (1) mounted on a vehicle body and imaging a region surrounding the vehicle body, lens distortion correction means (2) for performing lens distortion correction for an inputted image taken by the imaging device (1), and a display (3) for displaying the image obtained by the lens distortion correcting means (2). The lens distortion correction means (2) divides the inputted image into multiple regions and performs lens distortion correction for each of the regions with different distortion correction level.

Abstract: A projection-type display apparatus includes a setting unit configured to set a vertical keystone correction value used to correct a vertical distortion of a projection image and a horizontal keystone correction value used to correct a horizontal distortion of the projection image, and an image generator configured to generate an image representing a current vertical keystone correction value and a current horizontal keystone correction value that are set by the setting unit, and a settable range of each of the vertical keystone correction value and the horizontal keystone correction value from the current vertical keystone correction value and the current horizontal keystone correction value.

Abstract: An image display apparatus includes an OSD processing section that displays a test pattern, which includes a plurality of index lines arranged in one of horizontal and vertical directions with respect to a pixel area of a liquid crystal light valve at regular intervals, in the pixel area, an input operation section that sets at least one of the plurality of index lines as a reference index line, and adjusts the intervals of the index lines of the test pattern so as to increase or decrease as a distance from the reference index line increases with respect to the direction of the arrangement of the index lines taking the reference index line as a reference, and an image correction section that corrects linearity of the image based on the intervals of the index lines adjusted by the input operation section.

Abstract: In a general aspect, a method can include receiving a first projection pattern, where the first projection pattern is configured to violate a first parameter of a safety system of a laser projection system. The method can also include displaying the first projection pattern with the laser projection system and verifying proper implementation of the first parameter by the safety system based on visual appearance of the displayed first projection pattern. The method can further include receiving a second projection pattern, where the second projection pattern is configured to violate a second parameter of the safety system of the laser projection system and the second parameter is different than the first parameter. The method can further include displaying the second projection pattern with the laser projection system and verifying proper implementation of the second parameter by the safety system based on visual appearance of the displayed second projection pattern.

Abstract: This invention provides a calibration system and method for multi-unit display systems without a need for switching the system input resolution/configuration of the display system while calibrating. This serves to avoid carrying out a re-synchronization step. As such, this system and method allows for increases speed and reduced likelihood of failure. This system and method also corrects the display system by providing an arrangement that employs a minimum of required changes so as to avoid any changes that can consequently affect the output image of the display system. Calibration of the system of display units occurs free of any changes to the input resolution and this resolution is maintained in a manner that resists change unless specifically required. Moreover, this system and method enables a resolution for the overall system that differs from the sum of the input resolutions of the discrete, individual display units in the collection.

Abstract: A method for registering multiple projectors on a vertically extruded three dimensional display surface with a known aspect ratio includes recovering both the camera parameters and the three dimensional shape of the surface from a single image of the display surface from an uncalibrated camera, capturing images from the projectors to relate the projector coordinates with the display surface points, and segmenting parts of the image for each projector to register the projectors to create a seamlessly wall-paper projection on the display surface using a representation between the projector coordinates with display surface points using a rational Bezier patch. A method for performing a deterministic geometric auto-calibration to find intrinsic and extrinsic parameters of each projector is included.

Abstract: The invention provides an optical mask (1) for use in blending overlapping tiled images, the optical mask comprising a base (2); an array of elongate sliding elements (10) arranged side by side on the support, each sliding element being independently slidable along an axis and being constrained against lateral translational movement; the mask having a transmission-modifying edge (22) for positioning in a beam of light to modify transmission of the light, the transmission-modifying edge (22) having a profile which is adjustable by moving one or more of the sliding elements (10) along their axes.