WO2018092467A1 - Dispositif et procédé d'affichage, et dispositif de traitement d'image - Google Patents

Dispositif et procédé d'affichage, et dispositif de traitement d'image Download PDF

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Publication number
WO2018092467A1
WO2018092467A1 PCT/JP2017/036610 JP2017036610W WO2018092467A1 WO 2018092467 A1 WO2018092467 A1 WO 2018092467A1 JP 2017036610 W JP2017036610 W JP 2017036610W WO 2018092467 A1 WO2018092467 A1 WO 2018092467A1
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Prior art keywords
brightness
image
gradation value
pixels
pixel
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PCT/JP2017/036610
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English (en)
Japanese (ja)
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塩見　誠
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シャープ株式会社
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information

Definitions

  • the following disclosure relates to a display device that displays an image.
  • Patent Document 1 discloses a technique for generating an HDR (High Dynamic Range) image by combining data of a plurality of images having different exposures and emphasizing a luminance component in the combined image.
  • HDR High Dynamic Range
  • JP 2012-044639 A published March 1, 2012
  • the bi-directional reflectance distribution function is said to be able to express realistic reflection characteristics at a specific point, but it takes time to measure and is highly dependent on a fine surface shape. Just by shifting, the reflection characteristics are completely different. Therefore, it is difficult to specify the reflection characteristics of an actual object in the entire observation area using the bidirectional reflectance distribution function.
  • the reflection characteristics of an object are approximated by a spheroid model centered on regular reflection, and the reflection characteristics on the model are defined from statistical processing of actual measurement data. Since this method provides a reasonable rendering, the object can be viewed as a practical 3D model.
  • Patent Document 1 makes the entire image vivid, and according to the study of the inventor of the present application, it is difficult to obtain the effect of increasing the shine. That is, in this method, since the contrast feeling is uniformly improved even in an area where there is originally no shine, the surface of the object with the shine is sometimes obstructed by the user.
  • An object of one embodiment of the present disclosure is to provide a display device that can enhance a sense of brightness in an image.
  • a display device provides a gray level of the partial pixel so that the luminance of at least some of the plurality of pixels constituting the image fluctuates over time.
  • a fluctuation generation unit that determines a change in the value with time, and a display control unit that displays an image having a gradation value determined by the fluctuation generation unit.
  • a display method provides a gray level of the partial pixel so that the luminance of at least some of the plurality of pixels constituting the image fluctuates with time.
  • a fluctuation generating step for determining the value is included.
  • an image processing device configured so that the luminance of at least some of the plurality of pixels constituting the original image fluctuates with time.
  • a fluctuation generating unit that determines a change over time in the gradation value
  • an image generation unit that generates a plurality of images expressing the change over time in the gradation value determined by the fluctuation generation unit using the original image With.
  • FIG. 1 is a block diagram illustrating a main configuration of a liquid crystal display device according to Embodiment 1.
  • FIG. It is a functional block diagram which shows the structure of the display control circuit with which the said liquid crystal display device is provided.
  • (A) is a figure which shows the specific example of F (L) applied with the said liquid crystal display device
  • (b) is a figure which shows the specific example of Fa (L) applied with the said liquid crystal display device.
  • It is a flowchart which shows an example of the flow of a process in the said liquid crystal display device.
  • 6 is a functional block diagram illustrating a configuration of a display control circuit included in a liquid crystal display device according to Embodiment 2.
  • FIG. 10 is a functional block diagram illustrating a configuration of a display control circuit included in a liquid crystal display device according to Embodiment 3.
  • FIG. 6 is a functional block diagram illustrating a configuration of a display control circuit included in a liquid crystal display device according to a fourth embodiment.
  • (A)-(f) is a figure which shows an example of the noise pattern applied with the said liquid crystal display device.
  • FIG. 10 is a functional block diagram illustrating a configuration of an image display system including a liquid crystal display device and an image processing device according to a fifth embodiment.
  • Embodiment 1 An embodiment of the present disclosure will be described in detail based on FIGS. 1 to 4.
  • One embodiment of the present disclosure can be realized as an image processing device or a display device that can enhance the shine in an image.
  • an image processing device or a display device that can enhance the shine in an image.
  • a display device that generates an image with higher brightness and displays the image will be described.
  • FIG. 1 is a block diagram showing a main configuration of a liquid crystal display device 1 (display device).
  • the liquid crystal display device 1 includes a liquid crystal panel 10, a gate driver 20 and a source driver 30 that drive the liquid crystal panel 10, a backlight 40 that irradiates light to the liquid crystal panel 10, and a display control circuit 50.
  • the display control circuit 50 controls the display of the liquid crystal display device 1 by controlling the gate driver 20, the source driver 30, and the backlight 40.
  • a plurality of picture elements 11 are arranged in a matrix, for example.
  • a display device to which one embodiment of the present disclosure is applied is not limited to a liquid crystal display device, and may be another type of display device such as an organic EL (ElectroLuminescence) display device, a projection device, or a plasma display device. Good.
  • organic EL ElectroLuminescence
  • the image (display target image) displayed by the liquid crystal display device 1 may be a still image or a moving image.
  • the display target image is composed of a plurality of pixels.
  • image data indicating a display target image (referred to as input image data)
  • each pixel is represented by a combination of three gradation values corresponding to the three primary colors (R, G, B) of light as color components.
  • the input image data includes a red gradation value that defines a red gradation, a green gradation value that defines a green gradation, and a blue gradation value that defines a blue gradation for each pixel. Is shown in
  • FIG. 2 is a functional block diagram illustrating functions of the display control circuit 50.
  • the display control circuit 50 includes a main control unit 51 and a memory 52 that function as an image processing apparatus.
  • the main control unit 51 includes an object specifying unit 61 (specifying unit), a lightness emphasizing unit 62 (tone value increasing unit), and a display control unit 63.
  • the object specifying unit 61 includes an object (an object image) including a high brightness pixel having a gradation value equal to or higher than a gradation value indicated by a predetermined reference among pixels constituting the display target image (hereinafter referred to as a high brightness object). ).
  • This high-brightness object is an object having a relatively higher brightness than the surrounding brightness in the display target image, and an object having a relatively higher brightness than the surrounding brightness when the display target image is displayed. .
  • the object specifying unit 61 specifies a high brightness object as follows, for example.
  • the object specifying unit 61 performs edge detection processing or edge tracking processing on the display target image, and extracts a lightness boundary or a boundary having a contrast equal to or higher than a predetermined value in the display target image.
  • the object specifying unit 61 extracts a closed section formed by the specified boundary as an object included in the display target image.
  • the object specifying unit 61 may extract a boundary having a hue difference equal to or greater than a predetermined value.
  • the object specifying unit 61 calculates the brightness for all the pixels constituting the display target image, and calculates the average brightness at the plurality of pixels constituting the object and the average brightness at the plurality of pixels constituting the entire display target image. To do. When the object specifying unit 61 determines that the calculated average brightness of the object is larger than the calculated average brightness of the entire display target image, the object specifying unit 61 specifies the object as a high brightness object.
  • the object specifying unit 61 is, for example, the following formula: (Average brightness of object) ⁇ (Average brightness of entire display target image + Maximum brightness of entire display target image) / 2 (2) If the condition is satisfied, the object of interest may be specified as a high brightness object.
  • the object specifying unit 61 specifies the maximum brightness from the brightness of the plurality of pixels constituting the display target image, and calculates the average brightness of the plurality of pixels. In addition, the object specifying unit 61 specifies the maximum brightness from the brightness of the plurality of pixels constituting the extracted object, and calculates the average brightness of the plurality of pixels.
  • the object specifying unit 61 specifies the object as a high brightness object when it is determined that the calculated average brightness of the object is equal to or greater than the calculated maximum brightness and average brightness of the entire display target image.
  • the target to be compared with the average brightness of the object of interest may not be the entire display target image.
  • the object specifying unit 61 calculates an average brightness of an area including the object and its surrounding area (hereinafter referred to as an inclusion area), and compares the calculated average brightness of the inclusion area with the average brightness of the object of interest.
  • the high brightness object may be specified by.
  • the inclusion area is an area whose area is, for example, twice the area of the object, and the inclusion area is preferably specified so that the object is substantially at the center of the inclusion area.
  • the object specifying unit 61 may specify the high brightness object by calculating the average value of the maximum brightness and the average brightness of the inclusion area, and comparing the calculated average value with the average brightness of each object.
  • the area of the inclusion region only needs to be set so that an object having relatively high brightness can be specified in the display target image, and may be an area several times larger than the object (a value larger than 1). .
  • the object specifying unit 61 is not necessarily required to calculate the average brightness of a plurality of pixels constituting the object. For example, the object specifying unit 61 compares the brightness of each pixel constituting the object with the average brightness of the entire display target image, and 2/3 or more of all the pixels constituting the object are based on the average brightness of the entire display target image. May be specified as a high brightness object.
  • the threshold value of the number of pixels of the object serving as a reference for comparison does not have to be 2/3 of all the pixels of the object, and is set so that an object with relatively high brightness can be specified in the display target image. Just do it.
  • the object specifying unit 61 may calculate a standard deviation of lightness instead of the average lightness, and the minimum lightness or maximum lightness of the object is a value based on the average lightness and the maximum lightness of the entire display target image (for example: You may compare with the said average brightness and the average value of maximum brightness.
  • the comparison when specifying a high-brightness object is to compare the average brightness of the object and the display target image, or to compare the average brightness of the object with the value based on the average brightness and the maximum brightness of the display target image.
  • the method for specifying the high brightness object can be limited.
  • the object specifying unit 61 may reduce the display target image.
  • the object specifying unit 61 specifies a high brightness object in the reduced display target image.
  • the object specifying unit 61 may not be able to specify the image as a high brightness object. However, it can be said that such an image is inconspicuous in luminance as compared with the entire display target image or a peripheral region of the image. Therefore, further increasing the brightness of such an image is not important for display from the viewpoint of enhancing the shine. Further, when the entire display target image is a blue sky, a gold leaf, a salt lake, or the like, there is a possibility that the object specifying unit 61 cannot extract an object because the brightness is high over the entire display target image.
  • the display control circuit 50 simply displays the display target image as “bright” as in a general liquid crystal display device. What is necessary is just to process as an image.
  • the object specifying unit 61 may calculate the brightness when each pixel is displayed, and specify the high brightness object using the calculated brightness as an index.
  • the method for specifying the high brightness object when the luminance is used as the index may be the same as the method for specifying the high brightness object when the brightness is used as the index.
  • the method for identifying a high-lightness object is not limited to the method for determining whether or not the object of interest is a high-lightness object on the basis of lightness. It may be a technique for determining whether or not.
  • the brightness enhancement unit 62 increases the brightness of the pixels included in the high brightness object specified by the object specifying unit 61. By increasing the brightness of the pixel, the luminance when the pixel is displayed can be increased.
  • a high brightness pixel for which the brightness enhancement unit 62 increases the brightness may be referred to as a target pixel, and a pixel that is not targeted for increasing the brightness may be referred to as a non-target pixel.
  • the brightness enhancement processing of the brightness enhancement unit 62 that emphasizes the brightness of the pixels included in the high brightness object, for example, the following processing may be mentioned.
  • the brightness enhancement unit 62 may increase the brightness of all the pixels of the high brightness object.
  • the brightness emphasis unit 62 may increase the brightness of pixels of the high brightness object that have a brightness greater than the average brightness of the entire display target image.
  • the brightness enhancement unit 62 identifies pixels that are larger than the average brightness of the entire display target image as target pixels, and specifies pixels that are equal to or lower than the average brightness as non-target pixels.
  • the brightness enhancement unit 62 may increase the brightness of the pixels included in the enhancement region defined based on the position of the high brightness pixel included in the high brightness object.
  • the brightness enhancement unit 62 is a pixel located within a predetermined distance from the position of an arbitrary high brightness pixel constituting the high brightness object, and the pixel located inside the high brightness object is set as the target pixel. Increase the brightness.
  • the brightness enhancement unit 62 may increase the brightness of pixels of a region having a predetermined width from the boundary of the high brightness object together with the pixels of the high brightness object specified by the object specification unit 61. . In this process, the brightness enhancement unit 62 may use an appropriate low-pass filter.
  • the above width depends on the use or performance of the liquid crystal panel 10, but is preferably a certain width for human sense, and is preferably about 8 pixels to 16 pixels, for example. When the display target image is displayed, this width is a width of about 6 minutes to 10 minutes as a viewing angle.
  • the outer edge of the region having the predetermined width may be defined such that the distance from the center of gravity of the high brightness object is constant, or the distance from the edge (boundary) of the extracted high brightness object is constant. May be defined.
  • the position of the outer edge may be defined as the number of pixels in the vertical direction and the number of pixels in the horizontal direction from the boundary.
  • the brightness enhancement unit 62 uses pixels in a region (outer edge region) having a predetermined width from the boundary of the high brightness object among the pixels of the high brightness object specified by the object specification unit 61 as non-target pixels. Good.
  • the brightness emphasizing unit 62 sets the pixel in the area inside the outer edge area in the high brightness object as the target pixel, and increases the brightness of the pixel.
  • the setting of the width is as described above.
  • the brightness enhancement unit 62 may uniformly increase the brightness of the pixels included in the high brightness object, or may add a gradation so as to weaken how to increase the brightness as the distance from the high brightness pixel increases.
  • the brightness enhancement unit 62 increases the brightness of at least some of the pixels including the high brightness pixel among the plurality of pixels constituting the high brightness object.
  • the display control unit 63 controls the gate driver 20, the source driver 30, and the backlight 40 so that each pixel constituting the image is displayed with the brightness determined by the brightness enhancement unit 62.
  • the memory 52 is a non-volatile storage device that stores various formulas and various set values applied by the brightness enhancement unit 62.
  • the brightness enhancement unit 62 increases the brightness of the target pixel as follows, for example. The following processing may be performed for each of R, G, and B gradation values of each pixel.
  • Example 1 Simple brightness adjustment
  • L (P) the brightness of the target pixel
  • L ′ (P) the brightness of the target pixel after increasing the brightness
  • F the adjustment parameter for increasing the brightness
  • L ′ (P) (1 + F) ⁇ L (P) (3)
  • F the adjustment parameter for increasing the brightness
  • F is a factor that determines the degree of lightness enhancement.
  • F is a typical factor derived from the signal level (contrast, brightness of each pixel, etc.) of the display target image, the dynamic range, or the display performance of the liquid crystal display device 1. The value of F varies greatly depending on these values.
  • the method of increasing the brightness using the above formula (3) is applicable to all of the above-described brightness enhancement processing examples 1 to 5.
  • Example 2 Brightness adjustment in consideration of surrounding pixels
  • the brightness enhancement unit 62 identifies pixels within a predetermined distance (predetermined number of pixels) from the target pixel as the peripheral pixels, and calculates the average brightness of the peripheral pixels.
  • the brightness enhancement unit 62 applies the above formula (4), thereby increasing the brightness of the target pixel so that the target pixel becomes brighter as the brightness difference between the target pixel and the surrounding pixels increases. Therefore, the brightness of the target pixel can be enhanced as compared with the case where the above formula (3) is applied.
  • This technique can be realized with relatively low resources, and is excellent as a process for a pixel in which whiteout does not occur.
  • the method of increasing the brightness using the above formula (4) is applicable to all of the above-described brightness enhancement processing examples 1 to 5.
  • the brightness enhancement unit 62 may decrease the brightness of the non-target pixels when the non-target pixels are included in the plurality of pixels constituting the high brightness object.
  • the brightness enhancement unit 62 sets the brightness of the non-target pixel to L (Q), the brightness of the non-target pixel after the brightness is lowered to L ′ (Q), and the average brightness around the non-target pixel.
  • L (B) an adjustment parameter for reducing the brightness
  • F ′ L (Q) + F ′ ⁇ (L (Q) ⁇ L (B)) (5)
  • the brightness of the non-target pixel is reduced. In this case, it is possible to enhance the brightness of the target pixel while suppressing a decrease in the overall saturation of the high brightness object.
  • the method of increasing the brightness using the above formula (5) is applicable to the above-described brightness enhancement processing examples 2, 3, and 5. That is, the present invention can be applied to a process for increasing the brightness of some of the plurality of pixels constituting the high brightness object (a process when a non-target pixel is included in a part of the plurality of pixels).
  • F is a fixed value. Therefore, depending on the combination of the R, G, and B gradation values, gradation collapse (blackening or whiteout) may occur. In particular, when whiteout occurs, the image quality often deteriorates. In addition, it may be difficult to set an appropriate value of F so that whiteout does not occur in consideration of the brightness setting of the liquid crystal panel 10 and the like. By making F an environment-adaptive parameter that can be adjusted as appropriate, the occurrence of gradation collapse can be suppressed relatively easily. The same applies to F ′.
  • the brightness enhancement unit 62 sets the parameter (fixed value) for adjusting the brightness as f and F as a function F (L) of the brightness (L) of the pixel.
  • the following formula, L ′ (P) f ⁇ F (L (P)) ⁇ F (L (A)) ⁇ (L (P) ⁇ L (A)) (6)
  • F (L) can be set as shown in FIG.
  • FIG. 3A shows a specific example of F (L).
  • the horizontal axis represents the gradation value of each pixel of the display target image, and the vertical axis represents the F value.
  • F (L) takes the maximum value (1 in this example) when the target pixel is halftone (the gradation value of the target pixel is 512).
  • the value of F is the minimum value (0 in this example). That is, F (L) functions to change the lightness of the target pixel so that the lightness fluctuation is greatest in the case of halftone and the lightness fluctuation becomes smaller as the distance from the halftone is increased.
  • F (L) is applied to the average brightness L (A) around the target pixel as well as the brightness L (P) of the target pixel.
  • the brightness of the target pixel and the average brightness of the surroundings are changed according to the magnitude of the gradation value as described above, and the brightness of the target pixel and the average brightness of the surroundings are calculated.
  • the brightness enhancement unit 62 reduces the brightness of the pixel of interest when L (P) ⁇ L (A) ⁇ 0.
  • F 0 may be set when L (P) ⁇ L (A) ⁇ 0.
  • the value of f is 1/32 or more 1 / It is preferably about 8 or less.
  • the value of F is preferably about 1/64 or more and 1/16 or less.
  • the method of increasing the brightness using the above formula (6) can be applied to the above-described brightness enhancement processing examples 1 to 5.
  • F in the above equation (3) may be a brightness function Fa (L).
  • Fa (L) can be set as shown in FIG. 3B, for example.
  • FIG. 3B is a diagram illustrating a specific example of Fa (L). The horizontal axis represents the gradation value of each pixel of the display target image, and the vertical axis represents the F value.
  • Fa (L) takes the maximum value (1 in this example) when the gradation value of the target pixel is 0, and the gradation value of the target pixel is 1024.
  • the value of F is the minimum value (0 in this example). That is, the brightness of the target pixel is changed by Fa (L) so that the brightness variation is largest when the gradation value of the target pixel is near 0, and the brightness variation becomes smaller as the gradation value is away from 0. To do.
  • the brightness of the target pixel can be changed according to the magnitude of the gradation value, and the occurrence of overexposure can be suppressed more than in the above equation (3).
  • the full gradation of the display target image is 10 bits (1024 gradations), but the number of full gradations is not limited to this (example: 12).
  • F (L) has a maximum value (eg, 1) when F is halftone (50%), and has a gradation value of 0 (0%) and full gradation (100%). Any graph may be used as long as the value of F takes a minimum value (for example, 0) and monotonously decreases from the halftone toward the gradation value 0 and the full gradation.
  • the F value when the gradation value is 0 (0%) takes the maximum value (example: 1), and the F value when the gradation value is full (100%) is the minimum value (example: 0) and a graph that monotonously decreases from a gradation value 0 toward a full gradation.
  • the method of increasing the brightness using the above formula (7) is applicable to all of the above-described brightness enhancement processing examples 1 to 5.
  • the brightness enhancement unit 62 specifies the maximum brightness and the minimum brightness in the high brightness object, and calculates the average brightness in the high brightness object.
  • F1 and F2 are high brightness adjustment parameters.
  • the average brightness may be used instead of the maximum or minimum brightness of the denominator.
  • F1 is the same factor as F described above, and F2 is a fine adjustment factor for constructing a temporal fluctuation or a pseudo space.
  • F1 ⁇ F2 is a factor for adjusting the balance between the factor determined by the restriction derived from the liquid crystal display device 1 and the factor determined by the image effect set for the display target image.
  • the method of increasing the brightness using the above formula (8) is applicable to all of the above-described brightness enhancement processing examples 1 to 5.
  • FIG. 4 is a flowchart illustrating an example of a processing flow in the liquid crystal display device 1.
  • the object specifying unit 61 When receiving the input image data indicating the display target image (S1), the object specifying unit 61 extracts an object included in the display target image, for example, by performing an edge detection process (S2). The object specifying unit 61 specifies a high brightness object including a high brightness pixel from the extracted objects, and transmits information specifying the high brightness pixel included in the specified high brightness object to the brightness enhancement unit 62 ( S3: specific process).
  • the brightness emphasizing unit 62 increases the brightness of at least some of the pixels (target pixels) among the high brightness pixels of the high brightness object specified by the object specifying unit 61 (S4: gradation value increasing step).
  • the brightness enhancement unit 62 transmits output image data indicating a display target image in which the brightness of the target pixel is increased to the display control unit 63.
  • the display control unit 63 transmits the output image data received from the brightness enhancement unit 62 and a timing signal indicating the timing for displaying the output image data on the liquid crystal panel 10 to the source driver 30.
  • the source driver 30 applies a voltage corresponding to the gradation value of each pixel indicated by the output image data to the pixel electrode of each pixel 11 at a timing based on the timing signal.
  • the display control unit 63 controls the gate driver 20 and the backlight 40 together with the control of the source driver 30.
  • the display target image whose brightness is adjusted by the brightness enhancement unit 62 is displayed on the liquid crystal panel 10 by applying the voltage to each pixel electrode and turning on the backlight 40 at an appropriate timing. (S5).
  • An image processing device having the same functions as the object specifying unit 61 and the brightness enhancement unit 62 in the main control unit 51 may be realized as a device independent of the display device.
  • an image processing program that causes the CPU to function as the object specifying unit 61 and the brightness enhancement unit 62 may be installed in a CPU included in a digital device for image reproduction / recording, and the digital device may function as an image processing device.
  • Metadata may be attached to the display target image.
  • the metadata includes, for example, data related to the brightness of the display target image (brightness range, maximum brightness, minimum brightness, average brightness, etc.).
  • the object specifying unit 61 and the lightness emphasizing unit 62 may perform the above-described processing based on the data relating to the lightness.
  • the data included in the metadata may be data relating to luminance instead of brightness.
  • the metadata includes object information indicating what kind of object the display target image indicates, and the object specifying unit 61 may specify the object based on the information.
  • the object information is, for example, information indicating that a shining sun or a sparkling jewel is displayed.
  • the brightness enhancement unit 62 increases the brightness of high brightness pixels (specifically, target pixels) included in the high brightness object specified by the object specification unit 61. Therefore, the liquid crystal display device 1 can make the glossy object included in the display target image brighter than the original image.
  • the liquid crystal display device 1 is an HDR-compatible display device, it is possible to display a display target image with higher brightness than in the case of an SDR-compatible display device. Therefore, it is possible to make an object having gloss more shine.
  • FIG. 5 is a functional block diagram showing functions of the display control circuit 50a provided in the liquid crystal display device 1a (display device) of the present embodiment.
  • the display control circuit 50 a includes a main control unit 51 a (image processing device) instead of the main control unit 51.
  • the main control unit 51a includes a region specifying unit 64 (specifying unit), a lightness emphasizing unit 62a (tone value increasing unit), and a display control unit 63.
  • the area specifying unit 64 includes a divided area (hereinafter referred to as a high brightness area) including a high brightness pixel having a brightness equal to or higher than a brightness indicated by a predetermined reference among a plurality of divided areas defined by dividing the display target image. ).
  • the region specifying unit 64 divides the display target image into regions having a predetermined size (for example, 16 pixels ⁇ 16 pixels or 64 pixels ⁇ 64 pixels).
  • the identification of the divided area can be realized only by calculation based on the address of each pixel of the display target image.
  • processing such as edge detection processing, which is a relatively advanced processing, executed when specifying a high brightness object is unnecessary. For this reason, it is possible to specify a region to be targeted for enhancing brightness with low resources.
  • the process of specifying the high brightness area from the plurality of divided areas by the area specifying unit 64 may be the same as the process of the object specifying unit 61 for specifying the high brightness object from the extracted objects in the first embodiment.
  • the lightness enhancement unit 62a increases the lightness of at least some of the pixels including the high lightness pixel among the plurality of pixels constituting the high lightness region (divided region) specified by the region specifying unit 64.
  • the process for increasing the brightness by the brightness enhancement unit 62a may be the same as the process of the brightness enhancement unit 62 for increasing the brightness of the pixels constituting the high brightness object in the first embodiment.
  • the lightness enhancement unit 62a may reduce the lightness of some pixels (non-target pixels) among a plurality of pixels constituting the high lightness region.
  • FIG. 6 is a flowchart illustrating an example of a processing flow in the liquid crystal display device 1a.
  • the region specifying unit 64 When receiving the input image data indicating the display target image (S1), the region specifying unit 64 specifies a divided region set for the display target image (S11).
  • the area specifying unit 64 specifies a high brightness area including high brightness pixels from the plurality of divided areas, and transmits information specifying the specified high brightness area to the brightness enhancement section 62a. (S12: specific process).
  • the brightness enhancement unit 62a increases the brightness of at least some of the pixels (target pixels) among the high brightness pixels in the high brightness region specified by the region specifying unit 64, and outputs an output image indicating the display target image after adjusting the brightness.
  • Data is transmitted to the display control unit 63 (S4: gradation value increasing step).
  • the display control unit 63 controls the source driver 30 and the gate driver 20 and the backlight 40 based on the output image data received from the brightness enhancement unit 62a. Thereby, the display control unit 63 displays the display target image whose brightness is adjusted by the brightness enhancement unit 62a on the liquid crystal panel 10 (S5).
  • the area specifying unit 64 may determine whether each area is a high brightness area while shifting a brightness determination area (for example, 64 pixels ⁇ 64 pixels) having a predetermined size by a predetermined distance (for example, 32 pixels). Good. In this case, if the area is a high brightness area before shifting 32 pixels vertically and horizontally and is not a high brightness area after shifting, the brightness emphasis unit 62a reduces the brightness emphasis level in the overlapping portion.
  • a brightness determination area for example, 64 pixels ⁇ 64 pixels
  • a predetermined distance for example, 32 pixels.
  • the brightness of the high brightness area may be enhanced by the following method. For example, reduced images having different sizes in stages such as 1/2, 1/4, 1/8, 1/16, 1/32... Are prepared with respect to the original image.
  • the brightness enhancement unit 62a compares the brightness of the target pixel with the brightness of the surrounding pixels for each target pixel (the pixel in the region that included the target pixel in the case of a reduced image), and compares the brightness of the target pixel with the surroundings. As the difference from the brightness of the pixel is larger, the degree of brightness enhancement of the brightness of the target pixel having a higher brightness is increased.
  • the brightness enhancement unit 62a increases the brightness of high brightness pixels (specifically, target pixels) included in the high brightness region specified by the region specifying unit 64. Therefore, the liquid crystal display device 1a can make the glossy area included in the display target image brighter than the original image. Since high-level processing does not occur in the division of a plurality of regions from which high-lightness regions are extracted, the liquid crystal display device 1a emphasizes the lightness of the target pixel with low resources compared to the processing of the first embodiment. be able to.
  • FIG. 7 is a functional block diagram showing functions of the display control circuit 50b provided in the liquid crystal display device 1b (display device) of the present embodiment.
  • the display control circuit 50 b includes a main control unit 51 b (image processing device) instead of the main control unit 51.
  • the main control unit 51 b includes a high brightness pixel specifying unit 65 (specifying unit), a brightness emphasizing unit 62 b (tone value increasing unit), and a display control unit 63.
  • the high-lightness pixel specifying unit 65 specifies a high-lightness pixel having a gradation value equal to or higher than the gradation value indicated by a predetermined standard among the pixels constituting the display target image.
  • the predetermined standard is, for example, that the upper 25% pixels on the high brightness side among all the pixels constituting the display target image are extracted pixels.
  • the high brightness pixel specifying unit 65 calculates the brightness of the pixels constituting the display target image, and specifies the upper 25% pixels as the high brightness pixels.
  • the predetermined standard may be changed according to the metadata of the display target image or the display mode of the liquid crystal display device 1b.
  • the metadata is data relating to the brightness of the display target image (eg, brightness range), for example, as in the first embodiment, and the predetermined reference may be set based on the brightness range.
  • Examples of the display mode include a photo mode and a cinema mode.
  • the display mode can be changed by the user of the liquid crystal display device 1b, and the user can set the predetermined reference according to his / her preference.
  • the high brightness pixel specifying unit 65 calculates the brightness of the pixels constituting the display target image, specifies the maximum brightness of the display target image, and calculates the average brightness.
  • the high brightness pixel specifying unit 65 is, for example, the following equation: (Brightness of target pixel)> (Average brightness of entire display target image + Maximum brightness of entire display target image) / 2 If the condition is satisfied, the target pixel is specified as a high brightness pixel.
  • the predetermined standard eg, upper 25%
  • the high brightness pixel specifying unit 65 may determine that the target pixel is a high brightness pixel when the difference between the minimum brightness of the entire display target image and the brightness of the target pixel is equal to or greater than a predetermined value.
  • the high brightness pixel specifying unit 65 may reduce the display target image in order to reduce the amount of calculation in the above processing of the high brightness pixel specifying unit 65.
  • the high brightness pixel specifying unit 65 specifies a high brightness pixel in the reduced display target image.
  • the brightness enhancement unit 62b increases the brightness of each of the plurality of high brightness pixels using a value obtained by statistically processing (for example, averaging) the brightness (gradation value) of the high brightness pixels. More specifically, the lightness enhancement unit 62b increases the lightness of the high lightness pixels so that the color information obtained by statistical processing (for example, averaging) the color information indicated by the plurality of high lightness pixels is reflected.
  • the brightness enhancement unit 62b first averages the R, G, and B tone values of the high brightness pixels, thereby having the average value of each of the tone values as the R, G, and B tone values. Generate lighting information. Then, the brightness enhancement unit 62b adds a value corresponding to the brightness of the illumination information to each gradation value of the high brightness pixel so that the illumination component is added.
  • L ′ (P) is the brightness of the target pixel after increasing the brightness
  • L (P) is the brightness of the target pixel.
  • Fb is an adjustment parameter for increasing the brightness, and is F or F1 ⁇ F2 in the first embodiment.
  • H is a parameter indicating the brightness of illumination, and corresponds to the “lightness of illumination information” in Expression (9).
  • the chromaticity indicated by the illumination information is represented by (R, G, B) (that is, the average value of each gradation value of the high brightness pixel)
  • H (R / (R + G + B), G / (R + G + B), B / (R + G + B)) It becomes. It is difficult for the display control circuit 50b to specify how much the brightness of the illumination (the brightness of the illumination) is actually based on the display target image.
  • the brightness enhancement unit 62b increases the brightness of the high brightness pixel in consideration of the brightness of the illumination, it is only necessary to identify a relatively bright part (a part with a high brightness) in the display target image. The value is not so important. Therefore, in the above formula (10), a normalized ratio such as H may be used.
  • Fb (L) in the above formula (10) corresponds to Fb in the above formula (9).
  • Fb (L) represents Fb not as a fixed value but as a function of brightness.
  • Fb and Fb (L) are prepared for each of R, G, and B.
  • L (P) ⁇ L (A) in the above equation (10) is a term newly added to the above equation (9), and the brightness of the target pixel and the average brightness of pixels around the target pixel are Represents the brightness difference.
  • the brightness emphasizing unit 62b can apply the above formula (10) to change the value of Fb according to the brightness, and to increase the brightness in consideration of the influence of pixels around the target pixel. Therefore, the occurrence of whiteout can be suppressed relatively easily.
  • FIG. 8 is a flowchart illustrating an example of a processing flow in the liquid crystal display device 1b.
  • the high brightness pixel specifying unit 65 When receiving the input image data indicating the display target image (S1), the high brightness pixel specifying unit 65 specifies the high brightness pixel from the pixels constituting the display target image, and sets the pixel data indicating the high brightness pixel as the brightness. It transmits to the emphasis part 62b (S21: specific process).
  • the brightness enhancement unit 62b increases the brightness of the high brightness pixel specified by the high brightness pixel specifying unit 65 so that the color information is reflected, and outputs output image data indicating the display target image after adjusting the brightness.
  • 63 (S22: gradation value increasing step).
  • the display control unit 63 controls the source driver 30 and the gate driver 20 and the backlight 40 based on the output image data received from the brightness enhancement unit 62b. Thereby, the display control unit 63 displays the display target image whose brightness is adjusted by the brightness enhancement unit 62b on the liquid crystal panel 10 (S5).
  • the RGB information may be used as the information of (Y, R, G, B) after YUV conversion and further gamma correction.
  • Y means luminance.
  • calculation of a factor, identification of a pixel for which luminance is to be increased, and selection of a method for increasing luminance are performed using a Y value, and the increased luminance is applied to R, G, and B as they are in terms of maintaining the hue. And it is desirable to simplify the total calculation process.
  • the high brightness pixel specifying unit 65 and the brightness enhancement unit 62b when the display target image is a moving image, it is not necessary for the high brightness pixel specifying unit 65 and the brightness enhancement unit 62b to perform processing for all frames.
  • the high lightness pixel specifying unit 65 specifies high lightness pixels in an arbitrary frame, for example, the processing result of one frame before may be used. This is because it is difficult to improve the shine in the above process when the luminance (brightness) of the pixel fluctuates greatly in one frame before and after.
  • the variation in brightness (lightness) is small, it can be handled in the same manner as a still image. By simply performing the above processing, it is possible to reduce resources.
  • the object image in the display target image is obtained by combining specular reflection and diffuse reflection.
  • specular reflection In general, it is said that an object with higher gloss is more greatly affected by specular reflection, and an object with lower gloss is more affected by diffuse reflection.
  • the inventors of the present application have determined that the intensity of specular reflection light in a portion where the gloss of an object is strong is larger than the intensity of diffuse reflection light. Further, it has been specified that a portion of the display target image where the intensity of the specular reflection light is high can be specified based on the luminance (lightness) of the pixels constituting the display target image. Then, it is specified that a value obtained by statistically processing (for example, averaging) the gradation values of the high brightness pixels can be used as illumination light in the surrounding environment.
  • the display target image is displayed in two dimensions, it only represents a single picture viewed from an arbitrary direction. Therefore, even if reflection in a specific direction due to specular reflection is expressed in a display target image, there is a limit in generating a display target image that accurately reflects the reflection in the specific direction.
  • the inventor of the present application has a light source that can uniformly illuminate the object from any direction (uniformly) in the surrounding environment of the object in order to express specular reflection in the display target image without considering reflection in a specific direction. Assuming that the lighting is located. In this case, the light source can uniformly illuminate the entire area of the surrounding environment, and can generate scattered light in the surrounding environment. Therefore, assuming the above, the object is irradiated with scattered light in the surrounding environment as illumination light, and reflection based on the scattered light can be regarded as specular reflection.
  • the color or brightness of the illumination light applied to the portion is reflected in the portion (object or region) having relatively high brightness in the display target image.
  • the inventor of the present application captures the specular reflection in the display target image in a simplified manner based on the above assumption, and the average color of the portion with relatively high brightness reflects the color of the illumination light. As a result, the present inventors have found a technique for increasing the brightness of a portion with a strong gloss in a display target image.
  • the high brightness pixel specifying unit 65 specifies the high brightness pixel in the display target image, and the brightness enhancement unit 62b, for example, By applying 10), the brightness of the high brightness pixels is increased so that the color of the illumination light is reflected in the brightness of the high brightness object.
  • the liquid crystal display device 1b can increase the brightness and brightness by adding the color of the illumination light that is considered to affect the glossiness of the high brightness pixel that is estimated to have a strong glossiness. Therefore, the liquid crystal display device 1b can enhance the shine of the portion with a strong gloss in the display target image by the simple processing as described above.
  • FIG. 9 is a functional block diagram showing functions of the display control circuit 50c provided in the liquid crystal display device 1c (display device) of the present embodiment.
  • the display control circuit 50 c includes a main control unit 51 c (image processing device) instead of the main control unit 51.
  • the main control unit 51 c includes a high brightness pixel specifying unit 65, a fluctuation generating unit 66, and a display control unit 63.
  • the fluctuation generating unit 66 determines the lightness (gradation value) of each pixel so that the lightness of a plurality of pixels included in a specific region including the high lightness pixel specified by the high lightness pixel specifying unit 65 fluctuates over time. . As the brightness of the pixel fluctuates with time, the luminance when the pixel is displayed fluctuates with time.
  • the above specific area is an area to which the brightness of the pixel is changed over time.
  • the fluctuation generating unit 66 determines, for example, a region including a plurality of pixels existing within a predetermined range from the high brightness pixel specified by the high brightness pixel specifying unit 65 as a specific region.
  • the fluctuation generating unit 66 applies, for example, a plurality of types of predetermined patterns of 4 ⁇ 4 dots (blocks) to the original image, and sets the brightness of pixels within the 4 ⁇ 4 dot range within one second (for example, 100 ms intervals). Change with.
  • the predetermined pattern includes a plurality of types of blocks having different gradation levels, and the gradation value of the pixel to which the block is applied increases depending on which block is applied. The degree to do is different.
  • the plurality of types of predetermined patterns are different from each other in the arrangement of the plurality of types of blocks in the pattern.
  • the type of the predetermined pattern is not particularly limited and may be two or more types.
  • the fluctuation generating unit 66 applies the first predetermined pattern to the specific area of the original image, and sets the gradation value of each pixel included in the original image to the first predetermined pattern. By increasing the value indicated by, the gradation value after the fluctuation is applied to each pixel is calculated.
  • the fluctuation generating unit 66 generates an image (first image) after the fluctuation is applied, which reflects the gradation value after the fluctuation is applied.
  • the fluctuation generating unit 66 sequentially changes the predetermined pattern to be applied to the second and third predetermined patterns at the above time interval, and reflects the gradation value after the fluctuation is applied to each pixel for each predetermined pattern.
  • a plurality of images (second and third images) are generated. In this way, the fluctuation generating unit 66 generates a plurality of types of images in which the brightness of the pixels in the specific region has changed over time.
  • the display control unit 63 displays a plurality of types of generated images after the fluctuation is applied. In this way, by changing the brightness of a pixel over time, the luminance when the pixel is displayed can be changed over time.
  • the fluctuation generating unit 66 applies, for example, a noise pattern as shown in FIGS. 10A to 10F to the original image as the predetermined pattern for changing the brightness within the above range.
  • FIGS. 10A to 10F are diagrams showing examples of noise patterns.
  • Noise pattern is also used in general multi-gradation processing (dithering). However, in the multi-gradation processing, the value of each dot of the noise pattern (16 values in the case of 4 ⁇ 4 dots) is set to have irregularity (that is, randomly). If the display target image is a moving image, a plurality of types of noise patterns are prepared in order to prevent a specific pattern from appearing over a plurality of frames, and the noise pattern is switched for each frame.
  • the noise pattern of this embodiment has regularity (bias).
  • the upper left value of 4 ⁇ 4 dots is the smallest (0 in this example), and the lower right value is the largest (15 in this example). The value is set so as to increase from the upper left to the lower right.
  • the fluctuation generation unit 66 moves from the pixel corresponding to the upper left area toward the pixel corresponding to the lower right area as compared with the original image.
  • the rate at which the brightness increases is increased.
  • the fluctuation generating unit 66 switches the applied noise pattern among the plurality of noise patterns at the time interval (for example, 100 ms interval).
  • the time interval is sufficiently longer than the time interval for switching every frame in the multi-gradation processing.
  • the fluctuation generating unit 66 sequentially selects, for example, noise patterns having a close relationship with the shaded portion at the above time interval.
  • the user does not perceive the bright part (the center of gravity of the luminance) as a movement that can be consciously recognized, but can perceive the part as a fluctuation. . That is, the occurrence of brightness fluctuations in the specific area by the fluctuation generating unit 66 can make the user feel the temporal and spatial extent of the specific area.
  • a noise pattern as shown in FIG. 10 (f) may be prepared.
  • this noise pattern all values of dots are set to zero.
  • the fluctuation generating unit 66 may select the noise pattern shown in (f) of FIG. 10 at an appropriate timing.
  • the display target image that directly reflects the brightness of the pixels included in the original image can be displayed on the liquid crystal panel 10 at an appropriate timing, so that the brightness fluctuation partially reflecting the brightness of the original image is realized. can do.
  • FIG. 11 is a flowchart illustrating an example of a processing flow in the liquid crystal display device 1c.
  • the high brightness pixel specifying unit 65 When the high brightness pixel specifying unit 65 receives the input image data indicating the display target image (S1), the high brightness pixel specifying unit 65 specifies the high brightness pixel from the pixels constituting the display target image, and stores information indicating the specified high brightness pixel. It transmits to the fluctuation generation part 66 (S21: specific process).
  • the fluctuation generating unit 66 selects a predetermined pattern to be applied to a specific region including the high brightness pixel specified by the high brightness pixel specifying unit 65 from the plurality of predetermined patterns, and applies the predetermined pattern. This increases the brightness of the high brightness pixels.
  • the fluctuation generating unit 66 changes the lightness of each pixel in the specific area with time so as to generate a lightness fluctuation in the specific area by changing a predetermined pattern to be applied at the time interval ( S31: Fluctuation generating step).
  • the fluctuation generating unit 66 transmits to the display control unit 63 a plurality of output image data (image data group after the fluctuation is applied) reflecting the brightness of the high brightness pixels determined every time the predetermined pattern is changed.
  • the display control unit 63 controls the source driver 30 and the gate driver 20 and the backlight 40 based on the image data group after the fluctuation is received received from the fluctuation generation unit 66. Thereby, the display control unit 63 displays the display target image reflecting the brightness fluctuation generated by the fluctuation generation unit 66 on the liquid crystal panel 10 (S32).
  • the display target image is not limited to a still image and may be a moving image.
  • the high lightness pixel specifying unit 65 specifies the high lightness pixel
  • the fluctuation generating unit 66 causes the lightness of pixels in a specific region including the high lightness pixel to fluctuate with time. The brightness of the pixel is determined.
  • the fluctuation generating unit 66 detects a motion vector from a moving image in which high brightness pixels are specified, and determines whether or not the interference occurs. When it is determined that the interference occurs, the fluctuation generating unit 66 stops the above-described processing for changing the brightness of the pixels in the specific area. Further, the fluctuation generating unit 66 may switch to a predetermined pattern different from the predetermined pattern in which the interference has occurred, apply the predetermined pattern after switching, and determine whether the interference occurs again. . In this case, if interference does not occur, a predetermined pattern after switching is applied to determine the brightness of the pixels in the specific area. If the interference occurs even when the predetermined pattern is switched a predetermined number of times, the switching process may be stopped.
  • the inventor of the present application shows that a moving object (including a relative moving object by moving the eyes or head) is more glossy than a stationary object by the user through video shooting of many real objects.
  • the fluctuation generating unit 66 performs the same processing as that for a still image on a moving image (that is, processing that gives a change in brightness to pixels in a specific region and gives a pseudo effect of eye movement). Apply. Therefore, it can be said that the effect of the processing on the glossiness is small compared to the movement of the object in the moving image. Therefore, when the above-described interference occurs in the moving image, even if the processing of the fluctuation generating unit 66 is stopped, there is no problem that the glossiness is impaired as compared with the original image.
  • the present inventor has actually confirmed that the situation in which the interference occurs is extremely limited.
  • the present inventor for example, as the situation, for example, the area of the object to be shaken (the specific region) is large to some extent, and the moving speed of the object is the time interval for switching the predetermined pattern (for example, 100 ms interval). ) (N (integer) + 1/2) x (predetermined pattern block size) It is confirmed that the effect of fluctuation is difficult to obtain because the above interference occurs.
  • the fluctuation generating unit 66 stops the process when it is determined that the moving speed of the object is an integral multiple of 1/2 the block size, for example.
  • the fluctuation generating unit 66 stops the process when it is determined that the moving speed of the object has exceeded a predetermined value.
  • the predetermined value is a maximum value that does not cause uncertain interference, and can be set as appropriate from actual measurement.
  • the inventor of the present application has also confirmed that in most cases, the glossiness of the object is not impaired even if the fluctuation generating unit 66 is processed when the interference occurs.
  • the fluctuation generating unit 66 may use a pattern larger than a predetermined pattern (for example, 4 ⁇ 4 dots) prepared. In this case, the fluctuation generating unit 66 generates the large pattern by spatially interpolating from a predetermined pattern, for example.
  • the predetermined pattern may include a block in which the gradation value of the pixel included in the specific area is smaller than the gradation value in consideration of the continuity of the gradation of the display target image.
  • the fluctuation generating unit 66 When the fluctuation generating unit 66 applies a plurality of predetermined patterns at the same timing, it is not necessary to apply the same predetermined pattern, and a different predetermined pattern is applied to each of a plurality of specific areas included in the display target image. May be. Further, the fluctuation generating unit 66 may periodically change the prepared predetermined pattern at the above time interval or may randomly change it.
  • the time interval is not limited to the 100 ms interval, and may be set to a time interval such that the user who sees the display target image feels the brightness fluctuation in the specific area, that is, the brightness of the specific area.
  • the time interval is set to about 100 ms to 500 ms, for example.
  • Fluctuation generator 66 and display controller 63 In this configuration, luminance fluctuation is generated over the entire display target image. Therefore, in this configuration, the high brightness pixel specifying unit 65 is not necessary.
  • the fluctuation generating unit 66 changes the brightness (luminance) of a plurality of pixels included in the high brightness object specified by the object specifying unit 61 (or the high brightness region specified by the region specifying unit 64) over time.
  • High brightness pixel specifying unit 65 (or object specifying unit 61 or region specifying unit 64), brightness enhancing unit 62b (or brightness enhancing unit 62 or 62a), fluctuation generating unit 66, and display control unit 63
  • the fluctuation generating unit 66 changes the brightness (luminance) of a plurality of pixels whose brightness has been increased by the brightness enhancement unit 62b (or the brightness enhancement unit 62 or 62a) over time.
  • Any functional block of the high brightness pixel specifying unit 65, the object specifying unit 61, and the region specifying unit 64 may specify the pixel for which the brightness enhancing unit 62 b (or the brightness enhancing unit 62 or 62 a) increases the brightness. .
  • the inventors of the present application have confirmed that glossiness tends to be impaired particularly in still images. Further, the inventor of the present application has found the idea that the appearance (brightness) of an object is changed by the movement of the line of sight (fluctuation) without moving the head, and the glossiness can be strongly felt. The inventor of the present application has found that it is possible to approximately reinforce glossiness by generating fluctuations in lightness for pixels having high lightness from this confirmation and idea. That is, it has been found that the glossiness can be reinforced by changing the brightness of the high brightness pixels over time.
  • the fluctuation generating unit 66 fluctuates the brightness of a plurality of pixels included in a specific region including high brightness pixels over time. Therefore, the liquid crystal display device 1c can fluctuate the luminance with time in a specific region when the display target image is displayed. Thereby, the liquid crystal display device 1c reflects the change in the appearance of the object due to the movement of the line of sight on the image of the object (a specific strong reflection point) that is greatly affected by the specular reflection in the display target image. Therefore, the user can feel the glossiness of the object more strongly.
  • FIG. 12 is a functional block diagram showing a configuration of an image display system including the liquid crystal display device 1d and the image processing device 2 according to the present embodiment.
  • the image display system of the present embodiment includes a liquid crystal display device 1d and an image processing device 2, and is connected to be communicable with each other.
  • the image processing device 2 is a device that performs processing on an image (display target image) to be displayed on the liquid crystal display device 1d that is input from the outside, and includes a main control unit 101 and a memory 102.
  • the main control unit 101 includes a high brightness pixel specifying unit 65 and a fluctuation generating unit 66.
  • the memory 102 is a non-volatile storage device that stores data necessary for processing of the image processing apparatus 2.
  • the image processing apparatus 2 has the functions of the high brightness pixel specifying unit 65 and the fluctuation generating unit 66 included in the liquid crystal display device 1c of the fourth embodiment.
  • the image processing device 2 generates an image after the above-described fluctuation is applied from the original image, and transmits the generated image to the liquid crystal display device 1d.
  • the fluctuation generating unit 66 of the present embodiment is (1) a function of determining a change over time in gradation values of some of the pixels so that the luminance of at least some of the pixels constituting the original image fluctuates over time; (2) a function (image generation unit) that generates, using the original image, a plurality of images that express changes over time in the gradation values determined in (1) above;
  • control blocks (particularly the main control units 51 and 51a to 51c and the main control unit 101) of the liquid crystal display devices 1 and 1a to 1c and the image processing device 2 are logic circuits formed in an integrated circuit (IC chip) or the like. (Hardware) or software using a CPU (Central Processing Unit).
  • the liquid crystal display devices 1, 1 a to 1 c and the image processing device 2 can be read by a computer (or CPU) that executes a program command that is software that implements each function, and the program and various data. It includes a recorded ROM (Read Only Memory) or a storage device (these are referred to as “recording media”), a RAM (Random Access Memory) for expanding the program, and the like. And the objective of 1 aspect of this indication is achieved when a computer (or CPU) reads and runs the said program from the said recording medium.
  • a “non-temporary tangible medium” such as a tape, a disk, a card, a semiconductor memory, a programmable logic circuit, or the like can be used.
  • the program may be supplied to the computer via any transmission medium (such as a communication network or a broadcast wave) that can transmit the program.
  • any transmission medium such as a communication network or a broadcast wave
  • one aspect of the present disclosure can also be realized in the form of a data signal embedded in a carrier wave in which the program is embodied by electronic transmission.
  • the luminance of at least some of the plurality of pixels constituting the image (display target image) fluctuates with time.
  • a fluctuation generation unit (66) that determines a change in gradation value with time, and a display control unit (63) that displays an image having the gradation value determined by the fluctuation generation unit.
  • the display device can fluctuate the luminance of at least some of the plurality of pixels constituting the image over time, so that the brightness of the image can be enhanced.
  • a high gradation value pixel (high brightness pixel, target pixel) having a gradation value equal to or higher than a gradation value indicated by a predetermined reference among the pixels constituting the image.
  • Specifying unit object specifying unit 61, region specifying unit 64, high brightness pixel specifying unit 65
  • the fluctuation generating unit determines the gradation value of the high gradation value pixel specified by the specifying unit over time. May be changed.
  • the display device can change the gradation value of the specified high gradation value pixel over time.
  • the high gradation value pixel is highly likely to be a pixel that forms a portion having a relatively strong glossiness in the image. Therefore, the display device can particularly emphasize the feeling of brightness of the above portion.
  • the display device further includes, in aspect 2, a gradation value increasing unit (brightness emphasizing units 62, 62a, and 62b) that increases the gradation value of the high gradation value pixel specified by the specifying unit.
  • the fluctuation generating unit may change the gradation value of the pixel having the gradation value increased by the gradation value increasing unit over time.
  • the display device can increase the gradation value of the specified high gradation value pixel and change the gradation value of the pixel with time. Therefore, the display device can further enhance the feeling of brightness in the image.
  • the specifying unit (object specifying unit 61) specifies an image (high brightness object) of an object including the high gradation value pixel in the image.
  • the fluctuation generating unit may change the gradation values of at least some of the pixels including the high gradation value pixel over time among a plurality of pixels constituting the object image specified by the specifying unit. .
  • the display device can change the gradation values of at least some of the pixels including the high gradation value pixels over time among the plurality of pixels constituting the image of the object. Therefore, the display device can enhance the feeling of brightness of the image of the object.
  • the specifying unit (area specifying unit 64) specifies an area (high brightness area) including the high gradation value pixel in the image
  • the fluctuation generation unit may change the gradation values of at least some of the pixels including the high gradation value pixel over time among a plurality of pixels constituting the region specified by the specifying unit.
  • the display device can change the gradation values of at least some of the pixels including the high gradation value pixels over time among the plurality of pixels constituting the region. Therefore, the display device can enhance the feeling of brightness of the image of the object.
  • the gradation value increasing unit (lightness emphasizing unit 62b). May increase each gradation value of the plurality of high gradation value pixels using a value obtained by statistically processing the gradation values of the plurality of high gradation value pixels.
  • the display device can increase the gradation value of the high gradation value pixel by reflecting the statistically processed value.
  • the gradation value increasing unit reflects color information obtained by statistically processing color information indicated by the plurality of high gradation value pixels.
  • the gradation value of the high gradation value pixel may be increased.
  • the display device can increase the gradation value of the specified high gradation value pixel by adding the color of the illumination light that is considered to affect the gloss. For this reason, the display device can enhance the brightness of the portion with a strong gloss in the image.
  • the image processing device (2) is configured so that the luminance of at least some of the plurality of pixels constituting the original image (display target image) fluctuates with time.
  • a fluctuation generating unit (66) that determines a change with time of the tone value, and an image that generates a plurality of images that express a change with time of the gradation value determined by the fluctuation generating unit using the original image
  • a generating unit (fluctuation generating unit 66) that determines a change with time of the tone value, and an image that generates a plurality of images that express a change with time of the gradation value determined by the fluctuation generating unit using the original image.
  • the image processing apparatus can fluctuate the luminance of at least some of the plurality of pixels constituting the original image over time, so that the brightness of the image can be enhanced.

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Abstract

La présente invention concerne l'amélioration de la sensation de la luminosité d'une image. Ce dispositif d'affichage à cristaux liquides (1C) comprend : une unité de génération de fluctuation (66) qui détermine le changement au cours du temps dans les valeurs de gradation d'au moins quelques pixels parmi une pluralité de pixels qui forment une image, de sorte que la luminosité desdits quelques pixels fluctue au cours du temps ; et une unité de commande d'affichage (63) qui affiche une image à afficher ayant les valeurs de gradation déterminées par l'unité de génération de fluctuation (66).
PCT/JP2017/036610 2016-11-15 2017-10-10 Dispositif et procédé d'affichage, et dispositif de traitement d'image WO2018092467A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10285459A (ja) * 1997-04-04 1998-10-23 Sony Corp 画像変換装置及び画像変換方法
US20080056605A1 (en) * 2006-09-01 2008-03-06 Texas Instruments Incorporated Video processing
JP2013047935A (ja) * 2011-07-22 2013-03-07 Hitachi Consumer Electronics Co Ltd 映像処理装置、映像表示装置、及び映像処理方法
JP2013258684A (ja) * 2012-05-16 2013-12-26 Sharp Corp 表示装置、表示装置の制御方法、テレビジョン受像機、制御プログラム、および記録媒体
JP2015126254A (ja) * 2013-12-25 2015-07-06 株式会社ニコン 画像再生装置および撮像装置
JP2016092576A (ja) * 2014-11-04 2016-05-23 キヤノン株式会社 画像処理装置、画像処理方法、及び、プログラム

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10285459A (ja) * 1997-04-04 1998-10-23 Sony Corp 画像変換装置及び画像変換方法
US20080056605A1 (en) * 2006-09-01 2008-03-06 Texas Instruments Incorporated Video processing
JP2013047935A (ja) * 2011-07-22 2013-03-07 Hitachi Consumer Electronics Co Ltd 映像処理装置、映像表示装置、及び映像処理方法
JP2013258684A (ja) * 2012-05-16 2013-12-26 Sharp Corp 表示装置、表示装置の制御方法、テレビジョン受像機、制御プログラム、および記録媒体
JP2015126254A (ja) * 2013-12-25 2015-07-06 株式会社ニコン 画像再生装置および撮像装置
JP2016092576A (ja) * 2014-11-04 2016-05-23 キヤノン株式会社 画像処理装置、画像処理方法、及び、プログラム

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