Classifications

• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
  • H04N1/46—Colour picture communication systems
  • H04N1/56—Processing of colour picture signals
  • H04N1/60—Colour correction or control
  • H04N1/603—Colour correction or control controlled by characteristics of the picture signal generator or the picture reproducer
• • H—ELECTRICITY
  • H04—ELECTRIC COMMUNICATION TECHNIQUE
  • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
  • H04N9/00—Details of colour television systems
  • H04N9/64—Circuits for processing colour signals
  • H04N9/73—Colour balance circuits, e.g. white balance circuits or colour temperature control

Definitions

• the present invention relates to an environment-adaptive image display system, a presentation system, an image processing method, and a program.
• One way to adjust the appearance of such images is to use color management, which manages the input and output characteristics of the device to reproduce colors, but the specific method is not clear.
• the present invention has been made in view of the above problems, and its object is to provide a plurality of different locations.
• An object of the present invention is to provide an environment-adaptive image display system, a presentation system, an image processing method, and a program that can reproduce almost the same color in a short time.
• an environment-adaptive image display system provides an image display system based on visual environment information obtained by visual environment grasping means for grasping a visual environment in a display area of an image.
• a predetermined color in the visual environment information is converted into a coordinate value in a predetermined color space, and a coordinate value in the predetermined color space of the predetermined color in a predetermined reference environment; and the converted coordinate value;
• Color light information processing means for calculating coordinate values that are complementary color pairs of the converted coordinate values, based on
• the image input / output characteristic data used by the image display means is corrected based on the coordinate value reflecting the environment information and the coordinate value forming a complementary color pair, so that the image is adapted to the environment at the time of display. Can be displayed. Thereby, the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, almost the same color can be reproduced in a plurality of different places in a short time.
• the visual environment corresponds to, for example, environmental light (illumination light, natural light, etc.), an object to be displayed (display, wall surface, screen, etc.).
• environmental light illumination light, natural light, etc.
• an object to be displayed display, wall surface, screen, etc.
• the predetermined color is preferably white (gray), but is not limited to white.
• color space examples include, for example, L * a * b * (also referred to as L ab; hereinafter, abbreviated as "L ab”).
• L ab L * u * v * space
• L * C * h space L * C * h space
• U * V * W * space xy Y (also called Y xy) space, etc. are applicable.
• a complementary color pair is a color pair that becomes gray when the colors are mixed.
• the visual environment grasping means includes, for example, a brightness sensor for measuring a luminance value of a display area, a color light sensor for measuring an RGB value and an XYZ value of the display area, and a chromaticity value of the display area.
• a brightness sensor for measuring a luminance value of a display area
• a color light sensor for measuring an RGB value and an XYZ value of the display area
• chromaticity value of the display area One of chromaticity sensors for measuring the number of pixels or a combination thereof can be applied.
• the color light information processing means obtains an inverse vector of a binding vector indicating a coordinate position of the converted coordinate value in the color space as a coordinate value to be the complementary color pair.
• the correction means may correct the input / output characteristic data using the obtained inverse vector as a correction value.
• the correction can be performed at high speed.
• color light information for each gradation unit can be uniquely determined using the input / output characteristic data.
• the binding vector is a binding vector at a gray point on a predetermined color plane in the color space.
• the term vector is used to mean a vector that has magnitude and direction.
• the correction unit may perform gamma correction as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair.
• the color light information processing means may obtain coordinate values of a plurality of complementary color pairs for each predetermined gradation unit.
• the visual environment grasping means may include at least a means for measuring environmental light to grasp the visual environment.
• the environment-adaptive presentation system is a presentation system that corrects and displays the color of a presentation image in accordance with a viewing environment
• Visual environment grasping means for grasping a visual environment in a display area of the presentation image and generating visual environment information
• the visual environment information is converted into coordinate values in a predetermined color space, and the conversion is performed based on the coordinate values of the predetermined color in the predetermined color space in a predetermined reference environment and the converted coordinate values.
• Color light information processing means for obtaining a coordinate value that is a complementary color pair of the obtained coordinate value;
• the program according to the present invention is a program for correcting and displaying a color of a presentation image in accordance with a visual environment, and is a program embodied in an information storage medium or a carrier wave.
• Visual environment grasping means for grasping a visual environment in a display area of the presentation image and generating visual environment information
• the visual environment information is converted into coordinate values in a predetermined color space, and the conversion is performed based on the coordinate values of the predetermined color in the predetermined color space in a predetermined reference environment and the converted coordinate values.
• Color light information processing means for obtaining a coordinate value that is a complementary color pair of the obtained coordinate value;
• the information storage medium according to the present invention is an information storage medium usable by a computer
• the image input / output characteristic data used by the image display means is corrected based on the coordinate value reflecting the environment information and the coordinate value forming a complementary color pair, so that the image is adapted to the environment at the time of display. Can be displayed. Thereby, the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, almost the same color can be reproduced in a plurality of different places in a short time.
• the visual environment corresponds to, for example, environmental light (illumination light, natural light, etc.), an object to be displayed (display, wall surface, screen, etc.).
• environmental light illumination light, natural light, etc.
• an object to be displayed display, wall surface, screen, etc.
• the predetermined 3 ⁇ 4 is preferably white (gray), but is not limited to white.
• L * a * b * also called Lab
• L * u * v * space L * C * h space
• U * V * W * space xyY (Yxy This also applies to space.
• a complementary color pair is a color pair that becomes gray when the colors are mixed.
• the correction unit may perform gamma correction as the correction of the input / output characteristic data based on the coordinate value of the complementary color pair.
• the displayed area is an area on a screen
• the display means may include a projection means for projecting the presentation image toward the screen.
• the visual environment of the display area which easily affects the visual environment of the screen, is grasped, and the presentation image is projected and displayed by performing gamma correction, etc., so that almost the same color is obtained regardless of the visual environment.
• the screen may be a reflection type or a transmission type.
• the visual environment grasping means may grasp a visual environment reflecting the type of the screen.
• the visual environment grasping means may include means for grasping a visual environment at least reflecting a type of a screen. According to this, it is possible to absorb the difference in screen type by grasping the visual environment reflecting the screen type and performing gamma correction or the like based on the grasp result. As a result, almost the same color can be reproduced regardless of the screen type.
• the present invention it is possible to generate and display an image appropriately reflecting the visual environment by grasping the visual environment reflecting the type of the screen and correcting the color.
• the visual environment grasping means may include at least a means for measuring ambient light to grasp the visual environment.
• the visual environment grasping means may grasp at least a visual environment reflecting ambient light.
• ambient light has a significant effect on the image appearance.
• ambient light which is a major factor in the appearance of images, the visual environment can be properly grasped.
• the environment-adaptive image processing method according to the present invention is an image processing method for correcting a color of an image according to a viewing environment
• the image input / output characteristic data used by the image display means is corrected based on the coordinate value reflecting the environment information and the coordinate value forming a complementary color pair, so that the image is adapted to the environment at the time of display. Can be displayed. Thereby, the same image can be displayed regardless of the applied environment by absorbing the difference in the display environment. Therefore, almost the same color can be reproduced in a plurality of different places in a short time.
• the visual environment corresponds to, for example, environmental light (illumination light, natural light, etc.), an object to be displayed (display, wall surface, screen, etc.).
• environmental light illumination light, natural light, etc.
• an object to be displayed display, wall surface, screen, etc.
• the predetermined color is preferably white (gray), but is not limited to white.
• the color space includes, for example, a Lab space, an L * u * v * space, an L * C * h space, a U * V * W * space, an xyY (also referred to as Yxy) space, and the like.
• a complementary color pair is a color pair that becomes gray when the colors are mixed.
• the coordinate value calculating step includes a step of obtaining, as coordinate values to be the complementary color pair, an inverse vector of a binding vector indicating a coordinate position of the converted coordinate value in the color space,
• the correction step may include a step of correcting the input / output characteristic data using the obtained inverse vector as a correction value.
• the correction can be performed at high speed.
• the binding vector is a binding vector at a gray point on a predetermined color plane in the color space.
• the term vector is used to mean a vector that has magnitude and direction.
• the coordinate value calculating step may include, as the coordinate values to be the complementary color pair, the color space Determining a coordinate position of an outside point, which is a coordinate position of the coordinate value of the complementary color pair, based on a distance between the coordinate position of the coordinate value converted in the conversion step and a predetermined origin.
• the correcting step may include a step of correcting the input / output characteristic data using the obtained coordinate position of the external dividing point as a correction value.
• the correction can be performed at high speed.
• gamma correction may be performed as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair.
• a color gamut may be corrected as correction of the input / output characteristic data based on the coordinate values forming the complementary color pair.
• the color reproduction range specifically includes, for example, an RGB color triangle, a CMY color triangle, and a CMY K color square.
• the coordinate value calculating step may include a step of calculating coordinate values of a plurality of complementary color pairs for each predetermined gradation unit.
• FIG. 1 is a schematic explanatory diagram of a presentation system using a laser pointer according to an example of the present embodiment.
• FIG. 2 is a schematic explanatory diagram of a presentation system using a mobile projector.
• FIG. 3 is a functional block diagram of an image processing unit in a conventional projector.
• FIG. 4 is a functional block diagram of an image processing unit in the projector according to an example of the present embodiment. is there.
• FIG. 5 is a flowchart showing the flow of the entire presentation according to an example of the present embodiment.
• FIG. 6 is a flowchart showing the flow of preprocessing according to an example of the present embodiment.
• FIG. 7 is a flowchart showing a flow of calibration according to an example of the present embodiment.
• FIG. 8 is a flowchart showing a presentation flow according to an example of the present embodiment.
• FIG. 9 is a schematic diagram illustrating the concept of the inverse vector in the Lab space.
• FIG. 10A is a diagram showing RGB input / output characteristics relating to ideal light
• FIG. 10B is a diagram after correction of the RGB input / output characteristics shown in FIG. 10A.
• FIG. 11 is a schematic diagram illustrating the concept of an external dividing point in the Lab space.
• FIG. 12 is a schematic diagram showing a state before and after the correction of the RGB input / output characteristics.
• FIG. 13 is an explanatory diagram of a hardware configuration of a projector according to an example of the present embodiment.
• FIG. 1 is a schematic explanatory diagram of a presentation system using a laser pointer 50 according to an example of the present embodiment.
• An image for a predetermined presentation is projected from a projector 20 provided substantially in front of the screen 10.
• the presenter 130 points the desired position of the image in the image display area 12, which is the area to be displayed on the screen 10, with the spot light 70 projected from the laser pointer 50, Give a presentation to the audience.
• the type of screen 10 and the ambient light 80 The appearance of the image in the image display area 12 greatly differs depending on the image display area. For example, even when displaying the same white, depending on the type of the screen 10, it may appear yellowish white or blueish white. Also, even when displaying the same white, if the ambient light 80 is different, it looks bright white or dark white.
• the projector 20 has been reduced in size and has become easier to carry. For this reason, for example, a presentation may be made at the customer's site, but it is difficult to adjust the color in advance according to the customer's environment, and it takes time to manually adjust the color at the customer's site. It takes too much.
• FIG. 2 is a schematic explanatory diagram of a presentation system using a mobile projector.
• a conference room 520 an image is projected from a projector 20 to a dedicated screen 14 in a visual environment where ambient light 82 is generated by a fluorescent lamp.
• the presentation room 530 has fluorescent light and ambient light 84 due to external light, and an image is displayed using a screen 16 made of a different material from the screen 14.
• FIG. 3 is a functional block diagram of an image processing unit in a conventional projector.
• an R 1 signal, a G 1 signal, and a B 1 signal constituting an analog RGB signal sent from a PC or the like are input to an AZD converter 110. Then, the projector image processing unit 100 performs color conversion of the digital R 2, G 2, and B 2 signals converted by the A / D conversion unit 110.
• the DZA converter 180 converts the R3, G3, and B3 signals color-converted by the projector image processor 100 into analog signals.
• the LZV (light valve) drive unit 190 converts the analog, converted R4, G4, and B4 signals from the D / A converter 180 Based on this, the liquid crystal light valve is driven to perform image projection display.
• the projector image processing unit 100 controlled by the CPU 200 includes a projector color conversion unit 120 and a profile management unit 130.
• the projector color conversion section 120 is a projector in which the RGB digital signals (R2 signal, G2 signal, B2 signal) from the AZD conversion section 110 are managed by the profile management section 130. Converts to RGB digital signals (R3 signal, G3 signal, B3 signal) for projector output based on the input / output profile of.
• the profile means characteristic data.
• Color appearance is determined by three factors: light, the reflection or transmission of the target light, and vision.
• an image display system capable of reproducing the same color regardless of the applied environment is realized by grasping the visual environment reflecting the reflection or transmission of light and target light.
• a color light sensor 60 functioning as a visual environment grasping means for grasping the visual environment is provided, and the visual environment information from the color light sensor 60 is input to the projector 20.
• the color light sensor 160 measures the color light information (more specifically, three stimulation values of RGB or XYZ) of the image display area 12 in the screen 10.
• the projector 20 converts the viewing environment information into coordinate values in a predetermined color space, and, based on the coordinate values in a predetermined color space of a predetermined color in a predetermined reference environment and the converted coordinate values, Color light information processing means is provided for obtaining coordinate values that are complementary color pairs of the converted coordinate values.
• the projector 20 is provided with a correction unit that corrects the input / output characteristic data for display used by the unit that displays an image based on the obtained coordinate values that are the complementary color pair.
• a correction unit that corrects the input / output characteristic data for display used by the unit that displays an image based on the obtained coordinate values that are the complementary color pair.
• FIG. 4 is a functional block diagram of an image processing unit in projector 20 according to an example of the present embodiment.
• the projector 20 inputs the R1, G1, and B1 signals constituting the analog RGB signals sent from a PC or the like to the A / D converter 110, and outputs digital R2, G2, and G2 signals.
• the B2 signal is subjected to color conversion using the projector image processing unit 100.
• the projector 20 inputs the color-converted R3 signal, G3 signal, and B3 signal to the DZA conversion unit 180, and converts the analog-converted R4 signal, G4 signal, and B4 signal.
• V Light knob Input to the drive unit 190 to drive the liquid crystal light valve to project and display images.
• the projector image processing unit 100 of the projector 20 includes a color signal conversion unit 160, a color signal inverse conversion unit 170, a color management unit 150, and a projector color conversion unit 12 0 is included.
• the color signal converter 160 converts the RGB digital signals (R2 signal, G2 signal, B2 signal) from the A / D converter 110 into XYZ values (Xl, Yl, ⁇ 1).
• the RGB signal is a device-dependent color that changes depending on the input / output device such as the projector 20, and the XYZ values are device-independent colors that are the same regardless of the device.
• a specific conversion method from the RGB digital signal to the XYZ values for example, a matrix conversion method using a 3 ⁇ 3 matrix (matrix) can be adopted.
• the color signal conversion section 160 outputs the converted XYZ values ( ⁇ 1, ⁇ 1, ⁇ 1) to the color management section 150.
• the color management unit 150 reflects the ⁇ value (X1, Yl, ⁇ 1) input from the color signal conversion unit 160 to the visual environment based on the measurement value of the color light sensor 160 as the visual environment grasping means. Convert to the ⁇ value ( ⁇ 2, ⁇ 2, ⁇ 2).
• the color management unit 150 includes the color light information processing unit 140 and the above-described program. And a profile management unit 130 that manages an input / output profile for the projector 20.
• the color light information processing unit 140 converts the white color reflecting the actual visual environment information into coordinate values in the Lab space, and, based on the coordinate values in the white Lab space in the predetermined reference environment and the converted coordinate values, A coordinate value that is a complementary color pair of the converted coordinate value is obtained. Note that a complementary color pair is a color pair that becomes gray when mixed with each other.
• the color light information processing unit 140 converts the XYZ values (X1, Yl, 1) input from the color signal conversion unit 160 into ⁇ values ( ⁇ 2) reflecting the visual environment based on the measurement values of the color light sensor 160. , ⁇ 2, ⁇ 2).
• the profile management unit 130 functions as the above-described correction means, and creates each input / output profile of the RGB signal of the projector 20. Further, the profile management section 130 manages the RGB input / output characteristics of the projector 20 using the created input / output profiles of the RGB signals.
• the color signal inverse conversion unit 170 converts the ⁇ values (X2, Y2, Z2) from the color light information processing unit 140 into RGB digital data using the inverse matrix of the above-described color signal conversion unit 160 matrix. Performs matrix inversion on signals (R5 signal, G5 signal, B5 signal). Further, the projector color conversion unit 120 refers to each of the RGB digital signals (R5 signal, G5 signal, B5 signal) from the color signal inverse conversion unit 170 with reference to the projector profile managed by the profile management unit 130. Then, it converts to RGB digital signals (R3 signal, G3 signal, B3 signal) of the projector output.
• the projector image processing unit 100 controlled by the CPU 200 includes a projector color conversion unit 120 and a profile management unit 130.
• the projector color conversion unit 120 converts each RGB digital signal (R6 signal, G6 signal, B6 signal) from the AZD conversion unit 110 into each input / output profile of the RGB signal managed by the profile management unit 130. Convert to RGB digital signals (R3 signal, G3 signal, B3 signal) for projector output based on.
• the RGB digital signal for projector output output from the projector color converter 120 is converted by the DZA converter 180 into an RGB analog signal (R4 signal, G4 signal, B4 signal), and the L / V drive section 190 drives the liquid crystal light valve based on the RGB analog signal to project and display an image.
• projector 20 projects and displays an image in consideration of the viewing environment.
• the projector 20 adjusts the input / output characteristic data for display used by the image display means based on the coordinate value reflecting the environment information and the coordinate value forming the complementary color pair, thereby adapting to the display environment. Images can be displayed. As a result, the projector 20 can absorb the difference in the display environment and display the same image regardless of the applied environment. Therefore, the projector 20 can reproduce almost the same color in a plurality of different places in a short time.
• FIG. 5 is a flowchart showing the flow of the entire presentation according to an example of the present embodiment.
• the projector 20 When making a presentation using the projector 20, the projector 20 performs preprocessing such as creation of an input / output profile using the profile management unit 130 (step S 2).
• the projector 20 performs calibration by copying the calibration image onto the screen 10 or the like, and performs adjustment corresponding to the viewing environment (step S4).
• the presenter 30 gives a presentation after the calibration is completed (step S6).
• the projector 20 projects a white image toward the screen 10.
• the color light sensor 60 which is a visual environment grasping means, measures color light information (precisely, three stimulus values of RGB or XYZ) of the image display area 12 where a white image is displayed.
• the projector 20 inputs visual environment information indicating the color light information measured by the color light sensor 60, and obtains an arbitrary gamma value and color temperature after arithmetic processing. Create an aisle.
• the ideal gamma value and color temperature may not be measured by the color light sensor 60 but have default values as internal data in advance.
• the projector 20 projects a white image toward the screen 10.
• the color light sensor 60 measures the color light information of the image display area 12 where the white image is displayed.
• Visual environment information indicating the color light information measured by the color light sensor 160 is input to the projector 20, and after the arithmetic processing, the RGB input / output profiles for obtaining an arbitrary gamma value and color temperature are corrected and recreated.
• the projector 20 projects and displays an actual presentation image with the RGB input / output profiles corrected.
• step S2 preprocessing (step S2) to presentation (step S6) will be described in detail in order.
• FIG. 6 is a flowchart illustrating the flow of the pre-processing according to an example of the present embodiment.
• the AZD converter 110 converts the analog signals (R1, G1, and B1 signals) of the reference white image for preprocessing into digital signals (R2, G2, B2 signal) (step S12).
• the color signal conversion unit 160 converts the digital signal into XYZ values (Xl, Y1, Z1) and outputs it to the color management unit 150 (Step S14).
• the color light information processing unit 140 in the color management unit 150 generates a color space (Lab space) based on the XYZ values (X1, Y1, Z1) (step S16). Then, the color light information processing unit 140 calculates and obtains the coordinate value of the reference white in the color space (step S18).
• the color light sensor 60 measures the XYZ values (X3, Y3, ⁇ 3), which are the color light information of the image display area 12 where the white image is displayed, and obtains the visual environment information ( ⁇ 3 , ⁇ 3, ⁇ 3) to the projector 20.
• the color light information processing unit 140 reflects the XY ⁇ value (X1, Yl, ⁇ 1) input from the color signal conversion unit 160 on the basis of the measurement value of the color light sensor 60 and reflects the visual environment. Convert to values (X2, Y2, Z2).
• the projector 20 projects and displays the white image for each predetermined gradation unit, and the color light sensor 60 outputs the XYZ values (X3, Y3, The color light information processing section 140 generates a color space (Lab space) based on the XYZ values (X1, Yl, Z1) of the white image for each gradation.
• the color signal inverse conversion unit 170 converts the XYZ values (X2, Y2, ⁇ 2) from the color light information processing unit 140 into each of the RGB digital signals ( Perform matrix inverse transformation on R5 signal, G5 signal and B5 signal (step S20).
• the profile management unit 130 creates each input / output profile of the RGB signal of the projector 20 based on the measurement value of the color light sensor 160 (step S22). As a result, each input / output profile in the reference environment is created.
• the projector color conversion section 120 outputs the RGB digital signals (R5 signal, G5 signal, B5 signal) from the color signal inverse conversion section 170 to the projector output.
• RGB digital signals R3, G3, B3
• the DZA converter 180 converts the RGB digital signal for projector output output from the projector color converter 120 into an RGB analog signal (R4 signal, G4 signal, B4 signal) (step S26).
• the L / V drive section 190 drives the liquid crystal light valve based on the RGB analog signal (step S28), and projects and displays a white image (step S30).
• the projector 20 creates the color space, the coordinate values in the color space in the reference environment, the input / output profiles of the RGB signals of the projector 20, and the like.
• step S4 the calibration (step S4) will be described.
• FIG. 7 is a flowchart showing a flow of calibration according to an example of the present embodiment.
• Presenter One 30 is the place where the actual presentation takes place. Calibration is performed before execution.
• step S4 first, the projector 20 projects and displays the white image used in the reference environment on the screen 10 in order to grasp the visual environment of the place where the actual presentation is performed. Then, the color light sensor 160 measures the color light information of the image display area 12 where the white image is displayed (step S32).
• the color light information processing unit 140 converts the XYZ value into a Lab value (Lab space) using a commonly used arithmetic expression (step S34). .
• the color light information processing unit 140 calculates and obtains coordinate values in the color space (Lab space) based on the measurement values of the color light sensor 160 (step S36).
• the color light information processing section 140 calculates and obtains a coordinate value as a complementary color pair based on the coordinate value in the reference environment obtained in step S18 and the coordinate value in the actual visual environment (step S 38).
• a method of calculating the coordinate value that is a complementary color pair for example, a method of obtaining an inverse vector of a binding vector indicating a coordinate position of a coordinate value of a white value in an actual presentation environment in a color space is employed. it can.
• FIG. 9 is a schematic diagram illustrating the concept of the inverse vector in the Lab space.
• the Lab space has a vertical axis of L (brightness), and a plurality of a * b * planes exist along the L axis.
• the coordinates of the white value in the actual presentation-presentation environment are (a 1 *, b 1 *) in a predetermined a * b * plane.
• the coordinate values (a 1 *, b 1 *) can be regarded as the origin of the a * b * plane, that is, the binding vector at the point where the a * b * plane intersects the L axis.
• the term vector is used to mean a vector having a magnitude and a direction.
• the coordinate value (a l *, bl *) and the coordinate value (one a 1 *, -b 1 *) that is a complementary color pair can be obtained.
• the white color is a point on the L axis, but in the actual environment, it is shifted from the origin on the L axis by (a 1 *, b 1 *). Therefore, the profile management unit 130 corrects the color by the inverse vector, so that the white coordinate value measured in the actual environment is located on the L-axis. Can reproduce the color in the reference environment.
• the color light information processing unit 140 corrects the XYZ values (X1, Y1, Z1) based on the coordinate values forming the complementary color pair; and outputs the YZ values (X2, Y2, ⁇ 2). I do.
• the color signal inverse conversion unit 170 performs matrix inverse conversion of the XY ⁇ values (X2, ⁇ 2, ⁇ 2) from the color light information processing unit 140 into RGB digital signals (R5 signal, G5 signal, B5 signal). Is performed (step S40).
• the profile management unit 130 re-creates each input / output profile of the created RGB signal based on the coordinate values of the complementary color pair (step S42).
• the projector 20 performs color correction for each of a plurality of a * b * planes existing on the L axis, that is, for each predetermined gradation unit such as 16 gradations or 32 gradations. I do.
• Each input / output profile is actually used for gamma correction.
• the brightness that is, the output (cdZm 2 ) of each RGB signal increases as the voltage, that is, the value of the input (V) increases.
• Figure 1OA shows the RGB input / output characteristics for ideal light. Accordingly, the projector 20 can obtain an ideal white color by an RGB input / output characteristic having no black spots in an ideal environment where there is no influence of ambient light or the screen 10 by the color light information by the color light sensor 60. it can.
• the color light information of the projector 20 is often affected by the ambient light, the screen 10 and the like.
• the color reproduction on the screen 10 is strongly influenced by R and G.
• the ideal white light output from the projector 20 is reproduced on the screen 10 with the white color still yellow. Therefore, in order to correct the influence of the ambient light and the screen 10 included in the color light information of the projector 20, the R and G input / output signals of the three RGB input / output signals are indicated by black point positions, By lowering the output according to the correction amount, the yellowish white The output can be corrected to ideal white light.
• Fig. 10B shows the R and G curves re-created by shifting the black point of Fig. 1 OA to the axis of the maximum input value (the rightmost dotted line in Fig. 1 OA).
• the R curve, G curve, and B curve of the corrected input / output signal characteristics for each gradation of RGB in Fig. 10B are obtained by the following equations (1) to (3).
• the correction coefficients KR, KG, and KB are obtained by equations (4) to (6).
• R signal (bit) input signal before KRX correction (1)
• KR R maximum input value after correction // 255 (4)
• FIG. 12 is a schematic diagram showing a state before and after correction of RGB input / output characteristics.
• the point where K (0, 0, 0), the axis of brightness passing through black and the color triangle r gb intersect, is W (1, 1, 1), that is, It is white.
• the color triangle r gb becomes, for example, a color triangle r, g ′ b ′.
• the white point which is the point where the brightness axis L passing through black intersects with the color triangle r 'g, b, is represented by W, (0.9, 0.9, 1 ), which is slightly closer to K (0, 0, 0) with respect to the color triangle rgb.
• the input / output profile in the actual application environment is created by the calibration (step S4), and the appropriate gamma correction is performed.
• step S6 the actual presentation (step S6) after the calibration is performed in this manner will be described.
• FIG. 8 is a flowchart showing the flow of a presentation according to an example of the present embodiment. .
• step S6 first, the AZD converter 110 converts the analog signals (R1, G1, and B1 signals) of the presentation image into digital signals (R6, G6, and B6 signals). ) (Step S52).
• the projector color converter 120 converts the digital signals (R6 signal, G6 signal, B6 signal) into digital RGB signals (R3 signal, G3 signal) for the projector 20 based on the adjusted RGB input / output profiles.
• Signal (B3 signal) (step S54).
• the DZA converter 180 converts the RGB digital signal for projector output output from the projector color converter 120 into an RGB analog signal (R4 signal, G4 signal, B4 signal) (step S58).
• the L / V drive section 190 drives the liquid crystal light valve based on the RGB analog signal (step S60), and projects and displays the presentation image (step S62).
• projector 20 corrects the input / output profile to reflect the viewing environment. Thereby, almost the same image can be reproduced regardless of the environment to which the projector 20 is applied.
• the correction can be performed easily and quickly.
• the correction can be performed easily and quickly.
• by correcting the input / output characteristic data for each gradation based on the coordinate values forming a complementary color pair it is possible to remove the influence of environmental light that affects ideal color light and obtain an ideal white balance. it can.
• FIG. 13 is an explanatory diagram of a hardware configuration of projector 20 according to an example of the present embodiment.
• the CPU 1000, ROM 1002, RAMI 004, information storage medium 1006, image generation IC 1010, I / O (input / output port) 1020-1 and 1020-2 are interconnected by the system bus 1016. Is connected to send and receive data You. Then, they are connected to the color light sensor 160, PC and other devices via 1 / 01020-1 and 1020-2.
• the information storage medium 1006 stores programs, image data, and the like.
• the CPU 1000 controls the entire apparatus and performs various data processing according to a program stored in the information storage medium 1006, a program stored in the ROM 1002, and the like.
• the RAM 004 is a storage means used as a work area or the like of the CPU 1000, and stores given contents of the information storage medium 1006 and the ROM 1002 and operation results S of the CPU 1000. Further, a data structure having a logical configuration for realizing the present embodiment is built on the RAMI 004 or the information storage medium 1006.
• FIGS. 1 to 12 The various processes described with reference to FIGS. 1 to 12 are realized by an information storage medium 1006 storing programs for performing these processes, a CPU 1000 operating according to the programs, an image generation IC 1010, and the like. Is done. Note that the processing performed by the image generation IC 1010 or the like may be performed by hardware using a circuit or the like, or may be performed by software by the CPU 1000 or a general-purpose DSP.
• the information storage medium 1006 for example, a CD_ROM, a DVD-ROM, a ROM, a RAM, or the like can be applied, and a method of reading the information may be a contact method or a non-contact method.
• the above-described functions can be realized by downloading a program or the like for realizing the above-described functions from a host device or the like via a transmission path. That is, the information for implementing the above-described functions may be embodied in a carrier wave.
• FIG. 11 is a schematic diagram illustrating the concept of an external dividing point in the Lab space.
• the coordinate value of the white value in the actual presentation environment is A 1 (a 1, b 1)
• the corresponding a * b * Assume that the coordinate value of the intersection with the L axis on the plane is B 1 (a 2, b 2), and the coordinate value of the complementary color pair to be obtained is P 1 (a 3, b 3).
• a coordinate value can be a complementary color pair using the external dividing point.
• the present invention can be applied to a case where a presentation or the like is performed by displaying an image using a display unit other than the projection unit such as the projector described above.
• display means include a liquid crystal projector, a projector using a DMD (Digital Micromirror Device), a CRT (Catho de Ray Tube), a PDP (Pl Display devices such as asma diisl apanel), FED (field emulsification on display), EL (Electro Luminescence), and direct-view type liquid crystal display devices are applicable.
• DMD Digital Micromirror Device
• CRT Catho de Ray Tube
• PDP Pl Display devices such as asma diisl apanel
• FED field emulsification on display
• EL Electro Luminescence
• direct-view type liquid crystal display devices are applicable.
• DMD is a trademark of Texas Instruments, USA.
• the function of the projector image processing unit 100 described above may be realized by a single image display device (for example, the projector 20) or may be distributed by a plurality of processing devices (for example, by the projector 20 and a PC). (Distributed processing).
• the means for grasping the visual environment is not limited to the color light sensor 60 for measuring the XYZ values, and various visual environment grasping means can be applied.
• a visual environment grasping means for example, a luminance sensor for measuring the luminance value of the display area, a color light sensor for measuring the RGB value of the display area, a chromaticity sensor for measuring the chromaticity value of the display area, etc.
• a visual environment grasping means for example, a luminance sensor for measuring the luminance value of the display area, a color light sensor for measuring the RGB value of the display area, a chromaticity sensor for measuring the chromaticity value of the display area, etc.
• the visual environment grasped by the visual environment grasping means corresponds to, for example, environmental light (illumination light, natural light, etc.), an object to be displayed (display, wall surface, screen, etc.).
• environmental light illumination light, natural light, etc.
• an object to be displayed display, wall surface, screen, etc.
• the above-described screen 10 is of a reflective type, it may be of a transmissive type.
• the screen is a transmission type, it is preferable to use a sensor that directly scans the screen as the color light sensor.

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• Engineering & Computer Science (AREA)
• Multimedia (AREA)
• Signal Processing (AREA)
• Controls And Circuits For Display Device (AREA)
• Image Processing (AREA)
• Video Image Reproduction Devices For Color Tv Systems (AREA)
• Testing, Inspecting, Measuring Of Stereoscopic Televisions And Televisions (AREA)
• Processing Of Color Television Signals (AREA)
• Color Image Communication Systems (AREA)

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• 2000
  • 2000-05-08 JP JP2000134893A patent/JP3707350B2/ja not_active Expired - Fee Related
• 2001
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