Projection system and method for uniformity correction

Abstract

The projection system and calibration method therefore relates to a light source configured to emit light in response to image data; and an optical system configured to project the light emitted by the light source, receiving input related to a plurality of light values ​​corresponding to a plurality of original light fields; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to an image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame; projecting the image using the optical system in the image frame, a second image being corrected by the gain map.

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Provisional Application Nos. 61 / 967,655 and 63 / 125,202, filed January 30, 2020 and December 14, 2020, respectively, each of which is incorporated by reference in its entirety.

[0002] 1. Fields of Disclosure This application relates generally to projection systems and methods for correcting uniformity errors within an image frame. [Background technology]

[0003] 2. Description of Related Art Digital projection systems typically utilize a light source and optical system to project an image onto a surface or screen. The light source acts as a color display, mixing primary colors to create other colors. Displaying or projecting a particular color requires a precise mixture that must be repeated across the entire image frame. For example, when displaying a pure white image, the light source maximizes the red, green, and blue values ​​at each point on the surface or screen. However, if the precise mixture is not the same across the entire image frame, the image will have uniformity errors. Uniformity errors can be caused by physical characteristics of digital projection systems (e.g., manufacturing tolerances, wear of projector parts, thermal effects, bent cables, etc.). Image uniformity errors can be categorized as chromaticity uniformity errors and luminance uniformity errors. For example, chromatic coloration may occur along the edges of a projected image (chromaticity uniformity error), or some sections of a projected image may appear brighter than others (luminance uniformity error). Summary of the Invention [Problem to be solved by the invention]

[0004] Various aspects of the present disclosure relate to apparatus, systems, and methods for uniformity correction of a displayed image. [Means for solving the problem]

[0005] In one exemplary aspect of the present disclosure, there is provided a projection system having a light source configured to emit light in response to image data; an optical system configured to project the light emitted by the light source; and a controller configured to receive input related to a plurality of light values ​​corresponding to a plurality of primary light fields, convert the input related to the plurality of light values ​​to a plurality of projector primary color values, determine a gain map based on the plurality of projector primary color values, apply the gain map to an image to perform chromaticity uniformity correction by adjusting levels of the plurality of primary light fields so that a primary color mixture is the same across an image frame, and project the image in the image frame using the optical system, wherein a second image is corrected by the gain map.

[0006] In another exemplary aspect of the present disclosure, there is provided a method for correcting an image provided by a light source configured to emit light in response to image data and an optical system configured to project the light emitted by the light source, the method including receiving input related to a plurality of light values ​​corresponding to a plurality of original light fields, converting the input related to the plurality of light values ​​to a plurality of projector primary color values, determining a gain map based on the plurality of projector primary color values, applying the gain map to an image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that a primary color mix is ​​the same across an image frame, and projecting the image in the image frame with the optical system, wherein a second image is corrected using the gain map.

[0007] Another exemplary aspect of the present disclosure provides a non-transitory computer-readable medium having stored thereon instructions that, when executed by a processor, cause a projection system including a light source configured to emit light in response to image data and an optical system configured to project the light emitted by the light source to perform operations including receiving input related to a plurality of light values ​​corresponding to a plurality of original light fields, converting the input related to the plurality of light values ​​to a plurality of projector primary color values, determining a gain map based on the plurality of projector primary color values, applying the gain map to an image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that primary color mixing is the same across an image frame, and projecting the image with the optical system in the image frame, wherein a second image is corrected by the gain map.

[0008] In this manner, various aspects of the present disclosure provide for the display of images having high dynamic range and high resolution, leading to improvements in at least the fields of image projection, holography, signal processing, and the like. [Brief explanation of the drawings]

[0009] These and other more detailed and specific features of the various embodiments are more fully disclosed in the following description, taken in conjunction with the accompanying drawings.

[0010] [Figure 1] 1 shows a block diagram of an exemplary projection system in accordance with various aspects of the present disclosure.

[0011] [Figure 2] 1A-B show diagrams of an exemplary spatial light modulator for use with various aspects of the present disclosure.

[0012] [Figure 3] 2 illustrates an exemplary calibration method for the exemplary optical system of FIG. 1.

[0013] [Figure 4] 2A-2C show diagrams of the uncorrected light field projected by the exemplary optical system of FIG.

[0014] [Figure 5] 3A-3C show diagrams of chromaticity correction applied to an uncorrected light field.

[0015] [Figure 6] 5A to 5C show diagrams of the luminance profile after chromaticity correction. DETAILED DESCRIPTION OF THE INVENTION

[0016] The present disclosure and aspects thereof may be embodied in various forms, including hardware, apparatus, or circuits controlled by computer-implemented methods, computer program products, computer systems and networks, user interfaces, and application programming interfaces; as well as hardware-implemented methods, signal processing circuits, memory arrays, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), etc. The foregoing summary is intended merely to provide a general idea of ​​various aspects of the disclosure and is not intended to limit the scope of the disclosure in any way.

[0017] In the following description, numerous details are set forth, such as the configuration, timing, and operation of optical devices, to provide an understanding of one or more aspects of the present disclosure. It will be readily apparent to those skilled in the art that these specific details are merely exemplary and are not intended to limit the scope of the present application.

[0018] Additionally, while this disclosure primarily focuses on examples in which various circuits are used in digital projection systems, it will be understood that this is merely one example of implementation. Furthermore, it will be understood that the disclosed systems and methods can be used in any device that requires projecting light, such as cinema, consumer, and other commercial projection systems, heads-up displays, virtual reality displays, etc. The disclosed systems and methods can be implemented in additional display devices, such as OLED displays, LCD displays, quantum dot displays, etc.

[0019] Chromaticity and Luminance Uniformity

[0020] As mentioned above, image uniformity can be categorized into chromaticity uniformity and luminance uniformity. Chromaticity uniformity is a measure of the variation in chromaticity across an image frame (i.e., the entire frame of pixels that make up the image), without regard to the absolute chromaticity of the desired color. Chromaticity uniformity can be measured by comparing the chromaticity of the image to the chromaticity of the desired color.

[0021] Luminance uniformity is a measure of how well the luminance across an image frame conforms to a specified luminance profile. The luminance profile may not be flat, but a uniform luminance is smooth and symmetrical around the center of the image, even if it is brighter at the center. Luminance uniformity may consider the luminance profile rather than the absolute luminance of the desired color. Luminance uniformity may be measured by comparing the luminance of the image to the luminance of the desired color. If the luminance profile is not flat, the luminance should match at the image center.

[0022] Variations in luminance uniformity and chromaticity uniformity may not be equally perceived by the eye of an observer of a projected image. Luminance uniformity errors can be very large and may even be ignored without being visibly objectionable. However, chromaticity uniformity errors are easily noticeable. For example, for a white flat-field image, if the chromaticity is uniform and the luminance deviates smoothly from the luminance profile by between 10% and 20%, the observer is unlikely to notice a luminance error. However, if the chromaticity of each primary color differs from the others by between 10% and 20%, the chromaticity error is more easily noticeable.

[0023] These deviations in chromaticity and brightness across an image frame occur because projectors have physical components with non-ideal behavior, which can be caused by manufacturing tolerances, wear of projector components, thermal effects, bent cables, etc. For example, if a flat white image is applied as input without uniformity correction, the screen will show the raw primary light field. To display a flat white image, the primary light fields may be driven at their full power. Thus, uniformity correction of a white image involves reducing the light in regions of the primary light field. Since a high peak level of the primary light field is desirable, uniformity correction should minimize the reduction in brightness.

[0024] Chromaticity uniformity correction adjusts the levels of the original light field itself so that the primary color mix of the original light field is the same across the entire image frame. For example, if the original light field is red, green, and blue (i.e., RGB primaries), white is displayed as (R, G, B) = (1, 1, 1), where 1 is the maximum value for each light field. The original light field should be adjusted so that each point on the image frame is reduced to the minimum of the three original light field values, resulting in chromaticity uniformity with minimal total light loss. Performing this operation on a white screen can correct uniformity errors in all flat-field images other than white for the projection system. However, in situations where the original light field has a very low level and chromaticity correction results in unacceptably low light output, the display may be considered defective.

[0025] If chromaticity uniformity correction has already been applied, luminance uniformity correction adjusts all original light fields by the same amount because each original light field has the same level map or shape. However, this shape may not match a specified luminance profile, and attempting to match the specified luminance profile involves reducing the light levels of each of the original light fields. Thus, luminance uniformity may only be applied when non-uniformities are visible to a viewer or when the display must meet a standard specification for uniformity.

[0026] Chromaticity correction benefits from a target luminance profile that all original light fields conform to. If any one or the raw original light fields are non-smooth, the target luminance profile, which is the smallest of the three light fields, may also be non-smooth. Chromaticity uniformity correction targeting a non-smooth luminance profile will create luminance non-uniformities that may be visible. To prevent this, the smallest, smooth lower bound of the original light fields is used as the target luminance profile. The same smoothness constraint may be used if luminance uniformity correction is included in the target luminance profile. The various correction operations described herein may be implemented by the projector, as described in more detail below.

[0027] Projector System

[0028] 1 illustrates an exemplary high-contrast projection system 100 according to various aspects of the present disclosure. Specifically, FIG. 1 illustrates projection system 100 including a light source 101 configured to emit first light 102; illumination optics 103 (an example of an illumination optics system according to the present disclosure) configured to receive and redirect, steer, or otherwise modify first light 102, thereby generating second light 104 (i.e., steered light); a DMD 105 configured to receive and selectively redirect and / or modulate second light 104 as third light 106 (i.e., modulated light); first projection optics 107 configured to receive third light 106 and project it as fourth light 108; a filter 109 configured to filter fourth light 108, thereby generating fifth light 110; and second projection optics 111 configured to receive fifth light 110 and project it as sixth light 112 onto a screen 113.

[0029] In practical implementations, projection system 100 may include fewer optical components or may include additional optical components, such as mirrors, lenses, waveguides, optical fibers, beam splitters, and diffusers. With the exception of screen 113, the components shown in FIG. 1 may be integrated into a housing to provide a projection apparatus in some implementations. In other implementations, projection system 100 may include multiple housings. For example, light source 101, illumination optics 103, and DMD 105 may be provided in a first housing, and first projection optics 107, filter 109, and second projection optics 111 may be provided in a second housing that can be mated with the first housing. In some further implementations, one or more of the housings may themselves include subassemblies. The one or more housings of such a projection apparatus may include additional components, such as memory, input / output ports, communication circuitry, and power supplies.

[0030] The light source 101 may be, for example, a laser light source, an LED, or the like. Generally, the light source 101 is any light emitter that emits light. In some implementations, the light is coherent light. In some aspects of the present disclosure, the light source 101 may include multiple individual light emitters, each corresponding to a different wavelength or wavelength band. The light source 101 emits light in response to an image signal provided by a controller 114, e.g., one or more processors such as a central processing unit (CPU) of the projection system 100. The image signal includes image data corresponding to multiple frames to be displayed in succession. Individual elements within the projection system 100, including the DMD 105, may be controlled by the controller 114. Although not specifically shown in FIG. 1 , the controller 114 may additionally or alternatively control the illumination optics 103, the first projection optics 107, and the second projection optics 111. The image signal may originate from an external source in a streaming or cloud-based manner, may originate from internal memory of the projection system 100 such as a hard disk, may originate from removable media operably connected to the projection system 100, or a combination thereof.

[0031] 1 shows a generally linear light path, in reality the light path is generally more complex. For example, in projection system 100, secondary light 104 from illumination optics 103 is steered at an oblique angle to DMD chip 105 (or multiple chips).

[0032] To illustrate the effect of incidence angles and DMD mirrors, FIGS. 2A-B show an example DMD 200 according to various aspects of the present disclosure. In particular, FIG. 2A shows a plan view of the DMD 200, and FIG. 2B shows a partial cross-sectional view of the DMD 200 along line II-B shown in FIG. 2A. The DMD 200 includes a plurality of square micromirrors 202 arranged in a two-dimensional rectangular array on a substrate 204. In some examples, the DMD 200 may be a Texas Instruments Digital Light Processor (DLP). Each micromirror 202 may correspond to one pixel of the final projected image and may be configured to tilt about an axis of rotation 208 (shown for one particular subset of the micromirrors 202) by electrostatic or other actuation. The individual micromirrors 202 have a width 212 and are arranged with gaps of width 210 between them. The micromirrors 202 may be formed of or coated with any highly reflective material, such as aluminum or silver, to specularly reflect light. The gaps between the micromirrors 202 may be absorptive, such that input light that enters the gaps is absorbed by the substrate 204.

[0033] While FIG. 2A explicitly shows only a few representative micromirrors 202, in practice, DMD 200 may include many more individual micromirrors, with the number equal to the resolution of projection system 100. In some examples, the resolution may be 2K (2048×1080), 4K (4096×2160), 1080p (1920×1080), consumer 4K (3840×2160), etc. Furthermore, in some examples, micromirrors 202 may be rectangular and arranged in a rectangular array, hexagonal and arranged in a hexagonal array, etc. Furthermore, while FIG. 2A shows rotation axis 208 extending diagonally, in some implementations, rotation axis 208 may extend vertically or horizontally.

[0034] As seen in FIG. 2B , each micromirror 202 may be connected to a substrate 204 by a yoke 214 that is rotatably connected to the micromirror 202. The substrate 204 includes a plurality of electrodes 216. While only two electrodes 216 per micromirror 202 are visible in the cross-sectional view of FIG. 2B , each micromirror 202 may actually include additional electrodes. Although not specifically shown in FIG. 2B , the DMD 200 may further include spacer layers, support layers, hinge components that control the height or orientation of the micromirrors 202, and the like. The substrate 204 may include electronic circuitry associated with the DMD 200, such as CMOS transistors, memory elements, and the like.

[0035] Depending on the specific operation and control of the electrodes 216, individual micromirrors 202 may be switched between an “on” position, an “off” position, and an unactuated or neutral position. When a micromirror 202 is in the on position, it is actuated to an angle of (for example) −12° (i.e., rotated 12° counterclockwise from the neutral position) to specularly reflect input light 206 into on-state light 218. When a micromirror 202 is in the off position, it is actuated to an angle of (for example) +12° (i.e., rotated 12° clockwise from the neutral position) to specularly reflect input light 206 into off-state light 220. The off-state light 220 may be directed to a light dump that absorbs the off-state light 220. In some cases, the micromirror 202 may be unactuated and parallel to the substrate 204. The specific angles shown in Figures 2A-B and described herein are merely exemplary and not limiting. In some implementations, the angles for the on and off positions may each be between ±11 degrees and ±13 degrees inclusive.

[0036] 1 , if the DMD mirrors use a tilt angle of 12° to reflect or discard light, the second light 104 is steered to the DMD chip 105 at a fixed angle of 24°. When an individual mirror is tilted to a first predetermined angle (e.g., −12°), the mirror is considered to be in an on state and redirects the light to the first projection optics 107, the filter 109, and the second projection optics 111 (e.g., at a predetermined position). When an individual mirror is tilted to a second predetermined angle (e.g., +12°), the mirror is considered to be in an off state and redirects the light to a light dump located outside the active image area.

[0037] To ensure that the image on the screen 113 has acceptable clarity and has chromaticity and uniformity corrections across the entire image frame, the controller 114 may be calibrated and / or configured to provide uniformity corrections to the image data provided to the light source 101.

[0038] Uniformity Correction Method

[0039] Figure 3 illustrates an exemplary uniformity correction method that may be performed during calibration of projection system 100 shown in Figure 1. The correction method of Figure 3 may be performed in an automated manner, for example, through a computer program as described in more detail below.

[0040] In operation 301, the correction method receives input associated with a plurality of light values. The plurality of light values ​​may correspond to or be associated with a plurality of original light fields. For example, the plurality of light values ​​may include a value of a red light field at each point (e.g., each pixel) of the image frame, a value of a green light field at each point of the image frame, and a value of a blue light field at each point of the image frame.

[0041] In some implementations, the input related to the plurality of light values ​​of the first image is a picture of the first image captured by a camera. For example, the first image is projected using an optical system in an image frame. The first image may be a white image composed of a plurality of original light fields, such as red, green, and blue. The first image may include chromaticity errors, such as chroma tinting, along the edges of the image frame. Figures 4A-4C provide exemplary light fields of the first image. Figure 4A provides an uncorrected red light field of the white image, Figure 4B provides an uncorrected green light field of the white image, and Figure 4C provides an uncorrected blue light field of the white image.

[0042] As can be seen in FIG. 4A, the contour of the uncorrected red light field at one corner, designated as (0,40), is lower than the corresponding contour corners of the uncorrected green light field in FIG. 4B and the uncorrected blue light field in FIG. 4C. This means that the red uncorrected light field has a lower luminance value at (0,40) than the green uncorrected light and blue uncorrected light fields at (0,40). Similarly, the contour of the uncorrected red light field at (40,40) is higher than the corresponding contours of the uncorrected green light and uncorrected blue light fields. This means that the red uncorrected light field has a higher luminance value at (40,40) than the green uncorrected light and blue uncorrected light fields at (40,40).

[0043] Because the camera image (e.g., input associated with multiple light values) provides measured R, G, and B values ​​at each point in the image frame, the camera acts as a colorimeter measuring the R, G, and B values ​​of the first image projected by projection system 100. However, these values ​​may be linearly transformed from the actual values ​​projected by projection system 100. In operation 302, the correction method converts the input to multiple projector primary color values. This conversion provides the actual light values ​​of the multiple light fields contained in the first image projected by projector 100.

[0044] In operation 303, the correction method determines a gain map based on multiple projector primary color values. For example, if the first image projected by projection system 100 is a white image, the R, G, and B values ​​are each set to their maximum values. However, the maximum values ​​for each value may differ slightly due to imperfections in manufacturing and / or calibration, or non-ideal behavior in physical components. These may result in chroma coloration or other chromaticity and brightness errors in the first image. The projector primary color values ​​provide the actual values ​​(including errors) that projection system 100 will output for the first image.

[0045] When each of the multiple original light fields is at its maximum, uniformity can be achieved by reducing each R, G, and B value to its minimum. Thus, the level of the red original light field, the level of the green original light field, and the level of the blue original light field are each adjusted for each point in the image frame so that each level is reduced to its minimum level for each point. The gain map provides a map indicating how much adjustment should be made at each point in the image frame to achieve uniformity. For example, FIG. 5A provides redness correction for the uncorrected red light field of FIG. 4A. FIG. 5B provides greenness correction for the uncorrected green light field of FIG. 4B. FIG. 5C provides blueness correction for the uncorrected blue light field of FIG. 4C.

[0046] As seen in Figure 5B, the level of the green light field (e.g., light value) at (0,40) is multiplied by 0.9 to reduce the level. This reduction brings the level of the green light field down to the level of the red light field at (0,40). In Figure 5C, a similar amount of reduction is applied to the blue light field to reduce its level to the level of the red light field at (0,40). Similarly, as shown in Figure 5A, the level of the red light field at (40,40) is multiplied by 0.94 to reduce the level of the red light field at (40,40).

[0047] In operation 304, the correction method applies the gain map to the image to perform chromaticity uniformity correction. For example, the gain maps A, B, and C in FIG. 5 are applied to the uncorrected light fields A, B, and C in FIG. 4, respectively. The gain map may be applied to image data by controller 200 before the image data is provided to light source 101. For example, controller 200 modifies the image data provided to light source 101, thereby modifying the image projected by light source 101. The image may be a second image different from the first image. In operation 305, the correction method projects an image using an optical system in the image frame. For example, an image defined by the corrected image data is displayed to an observer. The second image may have a corrected light field such as that shown in FIG. 6. The second image may be visually uniform across the image frame. In addition, the second image may have a luminance profile that is a smooth lower bound of the multiple original light fields due to the application of the gain map and the adjustment of the levels of the multiple original light fields. By using a smooth lower bound, a smooth luminance profile is achieved.

[0048] As an example of the operation of FIG. 3, the following pseudocode is presented using a MATLAB®-like format. [Table 1]

[0049] In the pseudocode above, imgIn is the input image represented in display native levels and may exhibit uniformity errors. imgGain is the gain image used to apply uniformity correction. imgShow is the image used to drive the display device. imgCapture is the image to be displayed, captured by the camera and converted to display native levels. imgTarget is the level image that the R, G, B image will conform to after correction. TakeAndConvertPicture() is a function that takes a picture of the display image and converts it to display native levels. minRGB() is a function that takes an RGB image and returns a monochrome image where each pixel is the minimum of the R, G, and B at that pixel. Smooth() is a function that smooths the image enough to remove unwanted higher spatial variations in luminance.

[0050] The operations described herein may be implemented as instructions or code stored on a non-transitory computer-readable medium, such as a hard disk or other storage medium contained in or associated with projection system 100 (e.g., memory of controller 114).

[0051] The projection systems and methods described above may provide for correcting uniformity errors within an image frame. The systems, methods, and apparatus according to the present disclosure may take any one or more of the following configurations:

[0052] (1) A projection system having a light source configured to emit light in response to image data; an optical system configured to project the light emitted by the light source; and a controller, wherein the controller: receives input related to a plurality of light values ​​corresponding to a plurality of original light fields; converts the input related to the plurality of light values ​​into a plurality of projector primary color values; determines a gain map based on the plurality of projector primary color values; applies the gain map to an image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that primary color mixing is the same across an image frame; and is configured to project the image using the optical system in the image frame, wherein the second image is corrected by the gain map.

[0053] (2) The projection system of (1), wherein the optical system includes: an illumination optical system configured to steer light emitted by the light source into steered light; a digital micromirror device configured to receive the steered light from the illumination optical system and convert the steered light into modulated light; and a projection optical system configured to project the modulated light onto a screen.

[0054] (3) The projection system described in (1) or (2), wherein the controller is further configured to project a first image using the optical system in an image frame, the first image including the plurality of original light fields.

[0055] (4) A projection system described in any one of (1) to (3), wherein the input related to the plurality of light values ​​of the first image is a picture of the first image taken by a camera.

[0056] (5) A projection system as described in any one of (1) to (4), wherein applying the gain map to the image includes modifying an image signal provided by the light source.

[0057] (6) A projection system according to any one of (1) to (5), wherein the plurality of original light fields include red, green, and blue original light fields.

[0058] (7) The projection system of (6), wherein the levels of the red original light field, the green original light field, and the blue original light field are adjusted so that, for a plurality of individual points on the image frame, each level is reduced to the minimum value among the levels for the plurality of individual points.

[0059] (8) A projection system as described in any one of (1) to (7), wherein the first image includes chroma coloring at at least one location on at least one edge of the image frame.

[0060] (9) A projection system as described in any one of (1) to (8), wherein the second image is visually uniform across the image frame.

[0061] (10) A projection system according to any one of (1) to (9), wherein a smooth lower bound of the plurality of original light fields is the brightness profile of the second image.

[0062] (11) A method for correcting a projected image provided by a light source configured to emit light in response to image data and an optical system configured to project the light emitted by the light source, the method including: receiving input related to a plurality of light values ​​corresponding to a plurality of original light fields; converting the input related to the plurality of light values ​​to a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to an image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that primary color mix is ​​the same across an image frame; and projecting the image using the optical system in the image frame, wherein a second image is corrected by the gain map.

[0063] (12) The method of (11), wherein the optical system includes: an illumination optical system configured to steer light emitted by the light source into steered light; a digital micromirror device configured to receive the steered light from the illumination optical system and convert the steered light into modulated light; and a projection optical system configured to project the modulated light onto a screen.

[0064] (13) The method of (11) or (12), further comprising projecting a first image using the optical system in an image frame, the first image comprising the plurality of original light fields.

[0065] (14) A method according to any one of (11) to (13), wherein the input relating to the plurality of light values ​​of the first image is a picture of the first image taken by a camera.

[0066] (15) A method according to any one of (11) to (14), wherein applying the gain map to the image includes modifying an image signal provided by the light source.

[0067] (16) A method according to any one of (11) to (15), wherein the plurality of original light fields include red, green, and blue original light fields.

[0068] (17) The method described in (16), wherein the levels of the red original light field, the green original light field, and the blue original light field are adjusted for a plurality of individual points on the image frame so that each level is reduced to the minimum value of the levels for the plurality of individual points.

[0069] (18) A method according to any one of (11) to (17), wherein the second image is visually uniform across the image frame.

[0070] (19) A method according to any one of (11) to (18), wherein a smooth lower bound of the plurality of original light fields is the intensity profile of the second image.

[0071] (20) A non-transitory computer-readable medium storing instructions that, when executed by a processor of a projection system, cause the projection system to perform operations including the method described in any one of (11) to (19).

[0072] With respect to processes, systems, methods, heuristics, etc. described herein, although steps of such processes, etc. are described as occurring according to a certain ordered sequence, it should be understood that such processes can be performed with the described steps performed in an order other than the order described herein. Furthermore, it should be understood that certain steps can be performed simultaneously, other steps can be added, or certain steps described herein can be omitted. In other words, the process descriptions herein are provided for the purpose of illustrating certain embodiments and should not be construed as limiting the claims in any way.

[0073] Thus, it should be understood that the foregoing description is intended to be illustrative, not restrictive. Many embodiments and applications other than the examples provided will become apparent from reading the above description. The scope should be determined not with reference to the above description, but with reference to the appended claims, along with the full scope of equivalents to which such claims are entitled. It is anticipated and intended that there will be future developments in the technology discussed herein, and that the disclosed systems and methods will be incorporated into such future embodiments. In short, it should be understood that this application is capable of modification and variation.

[0074] All terms used in the claims are intended to be given their broadest reasonable interpretation and their ordinary meaning as understood by one skilled in the art described herein, unless expressly stated to the contrary in the specification. In particular, the use of singular articles such as "a," "the," "said," etc., should be read as describing one or more of the indicated elements unless the claim states an express limitation to the contrary.

[0075] The Abstract of the present disclosure is provided to allow the reader to quickly ascertain the nature of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Moreover, in the foregoing Detailed Description, it can be seen that various features are grouped together in various embodiments for the purpose of improving the flow of the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the claimed embodiments include more features than are expressly recited in each claim. Rather, as the claims reflect, inventive subject matter lies in less than all features of a single disclosed embodiment. Accordingly, the following claims are hereby incorporated into the Detailed Description, with each claim standing on its own as separately claimed subject matter.

Claims

1. a light source configured to emit light in response to image data; an optical system configured to project light emitted by the light source; a projection system having a projection lens and a controller, The controller: receiving an input related to a plurality of light values ​​corresponding to a plurality of original light fields for a first image; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to the first image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame, thereby generating a second image; configured to project the second image using the optical system, the second image being corrected by the gain map; the plurality of original light fields include red, green, and blue original light fields; levels of the red original light field, the green original light field, and the blue original light field are adjusted for a plurality of individual points on the image frame such that each level is reduced to a minimum value among the levels for the plurality of individual points; Projection system.

2. The optical system comprises: illumination optics configured to steer light emitted by the light source into steered light; a digital micromirror device configured to receive the steered light from the illumination optics and convert the steered light into modulated light; a projection optical system configured to project the modulated light onto a screen.

10. The projection system of claim 1.

3. The controller further configured to project the first image using the optical system, the first image including the plurality of original light fields.

3. A projection system according to claim 1 or 2.

4. 4. The projection system of claim 1, wherein the input relating to the plurality of light values ​​of the first image is a picture of the first image taken by a camera.

5. 5. The projection system of claim 1, wherein applying the gain map to the first image comprises modifying an image signal provided by the light source.

6. A light source configured to emit light in response to image data; an optical system configured to project light emitted by the light source; a projection system having a projection lens and a controller, The controller: receiving an input related to a plurality of light values ​​corresponding to a plurality of original light fields for a first image; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to the first image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame, thereby generating a second image; configured to project the second image using the optical system, the second image being corrected by the gain map; the first image includes chroma coloration at at least one location on at least one edge of the image frame; Projection system.

7. A light source configured to emit light in response to image data; an optical system configured to project light emitted by the light source; a projection system having a projection lens and a controller, The controller: receiving an input related to a plurality of light values ​​corresponding to a plurality of original light fields for a first image; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to the first image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame, thereby generating a second image; configured to project the second image using the optical system, the second image being corrected by the gain map; the second image is visually uniform across the image frame; Projection system.

8. A light source configured to emit light in response to image data; an optical system configured to project light emitted by the light source; a projection system having a projection lens and a controller, The controller: receiving an input related to a plurality of light values ​​corresponding to a plurality of original light fields for a first image; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to the first image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame, thereby generating a second image; configured to project the second image using the optical system, the second image being corrected by the gain map; a smooth lower bound of the plurality of original light fields is the intensity profile of the second image; Projection system.

9. 1. A method of correcting a projected image that includes a light source configured to emit light in response to image data and an optical system configured to project the light emitted by the light source, the method comprising: receiving an input related to a plurality of light values ​​corresponding to a plurality of original light fields of a first image; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to the first image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame, thereby generating a second image; projecting the image in the image frame using the optical system, the second image being corrected by the gain map; the plurality of original light fields include red, green, and blue original light fields; levels of the red original light field, the green original light field, and the blue original light field are adjusted for a plurality of individual points on the image frame such that each level is reduced to a minimum value among the levels for the plurality of individual points; method.

10. The optical system comprises: illumination optics configured to steer light emitted by the light source into steered light; a digital micromirror device configured to receive the steered light from the illumination optics and convert the steered light into modulated light; a projection optical system configured to project the modulated light onto a screen.

10. The method of claim 9.

11. and projecting a first image using the optical system in an image frame, the first image including the plurality of original light fields.

11. The method according to claim 9 or 10.

12. 12. The method of claim 9, wherein the input related to the plurality of light values ​​of the first image is a picture of the first image taken by a camera.

13. 13. The method of claim 9, wherein applying the gain map to the first image comprises modifying an image signal provided by the light source.

14. A method of correcting a projected image comprising a light source configured to emit light in response to image data and an optical system configured to project the light emitted by the light source, the method comprising: receiving an input related to a plurality of light values ​​corresponding to a plurality of original light fields of a first image; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to the first image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame, thereby generating a second image; projecting the image in the image frame using the optical system, the second image being corrected by the gain map; the second image is visually uniform across the image frame; method.

15. A method of correcting a projected image comprising: a light source configured to emit light in response to image data; and an optical system configured to project the light emitted by the light source, the method comprising: receiving an input related to a plurality of light values ​​corresponding to a plurality of original light fields of a first image; converting the input related to the plurality of light values ​​into a plurality of projector primary color values; determining a gain map based on the plurality of projector primary color values; applying the gain map to the first image to perform chromaticity uniformity correction by adjusting levels of the plurality of original light fields so that the primary color mix is ​​the same across an image frame, thereby generating a second image; projecting the image in the image frame using the optical system, the second image being corrected by the gain map; a smooth lower bound of the plurality of original light fields is the intensity profile of the second image; method.

16. 10. A non-transitory computer readable medium storing instructions that, when executed by a processor of a projection system, cause the projection system to perform operations including the method of claim 9.

Images