WO2008044438A1 - Procédé d'affichage d'image, programme d'affichage d'image et système d'affichage d'image - Google Patents

Procédé d'affichage d'image, programme d'affichage d'image et système d'affichage d'image Download PDF

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Publication number
WO2008044438A1
WO2008044438A1 PCT/JP2007/068145 JP2007068145W WO2008044438A1 WO 2008044438 A1 WO2008044438 A1 WO 2008044438A1 JP 2007068145 W JP2007068145 W JP 2007068145W WO 2008044438 A1 WO2008044438 A1 WO 2008044438A1
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WIPO (PCT)
Prior art keywords
candidate
image data
association
display
color
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PCT/JP2007/068145
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English (en)
Japanese (ja)
Inventor
Akira Yamano
Original Assignee
Konica Minolta Medical & Graphic, Inc.
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Priority to JP2008538612A priority Critical patent/JPWO2008044438A1/ja
Publication of WO2008044438A1 publication Critical patent/WO2008044438A1/fr

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Classifications

    • 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
    • G09G3/2003—Display of colours
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/43—Conversion of monochrome picture signals to colour picture signals for colour picture display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/06—Colour space transformation
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Definitions

  • Image display method image display program, and image display system
  • the present invention relates to an image display method, an image display program, and an image display system, and particularly displays a monochrome image having a number of gradations larger than the number of drive gradations of an image display unit on a color display.
  • the present invention relates to an image display method, an image display program, and an image display system.
  • Diagnostic images taken with medical diagnostic devices such as X-ray diagnostic devices, MRI (Magnetic Resonance Imaging) diagnostic devices, and various CT (Computed Tomography) devices are usually It is recorded on a light-transmitting image recording film such as an X-ray film or other film-sensitive material and reproduced as a light-transmitting image.
  • the film on which the diagnostic image is reproduced is set in an observation device called shear caster, and is observed in a state of being irradiated with light from the back, and the presence or absence of a lesion is diagnosed.
  • color displays such as CRT (Cathode Ray Tube) display and LCD (Liquid Crystal Display) are used as monitors for observing captured and measured images.
  • a display is connected, and the images output on these display screens are used to check, adjust, and process diagnostic images before diagnosis or film output!
  • a color display is used to display a color image of an endoscope or a fundus camera.
  • 3D such as ultrasonic diagnostic equipment, CT equipment, MRI equipment, etc.
  • a color display has been used to display images.
  • a 4096-level monochrome image signal value is converted into a preset LUT (Look Up Table). Based on this, it is converted to RGB values of 256 gradations.
  • the RGB values are equal to each other, and the RGB image data cannot display an image with more than 256 gradations.
  • FRC display refers to high gradation resolution (number of bits) !, and when image data is displayed as image data with low gradation resolution (number of bits), By generating image data with a low bit number corresponding to the difference between the two bit numbers and displaying the image data sequentially, the image corresponding to the high bit number is displayed in the image display with the low bit number. Key It is an expression.
  • R, G, B values are monotonically non-decreasing, and the total of RGB values is 1 as shown in Table 1 of Patent Document 2 where RGB is not only equal.
  • Patent Document 3 there is known an image display device that performs multi-tone expression using an LUT in which the signal value of a sub-pixel is increased or decreased within an arbitrary range. According to such an image display, it is theoretically possible to display an image with 4096 gradations or more.
  • Patent Document 1 JP 2000-330530 A
  • Patent Document 2 JP 2001-033422 A
  • Patent Document 3 Japanese Patent Laid-Open No. 2003-050566
  • the maximum value of the input monochrome image signal value is converted to the maximum value + the maximum value of G + the maximum value of B, and the RGB signal value Since there are strict restrictions on the combination of RGB values, only 766 gradations can be expressed without time-division display, which is not sufficient for simple image diagnosis. there were.
  • the present invention has been made in view of the above problems, and can display an image having an appropriate color tone as a monochrome image regardless of the number of bits of a monochrome image, and can further divide RGB pixels into sub-pixels. It is intended to provide an image display method, an image display program, and an image display system that can express with a gradation number that is four times more than the drive gradation number of the display without performing FRC display. .
  • n + m (n is an integer of 8 or more, m is an integer of 2 or more) bits of 1 channel monochrome image data based on a preset association, 3 bits or more of n bits
  • An image display method characterized by comprising: [0024] 2.
  • the number of gradations of each of the plurality of candidate associations is 2'k gradations ( n ⁇ k ⁇ n + m), and at least one gradation (n + 2 ⁇ k ' ⁇ 2.
  • C '2' ⁇ (2' (m + l) ⁇ C ⁇ 2 '(m + 4)) is selected as the candidate color display image data from all combinations of displayable color display image data and selected 3.
  • n + m (n is an integer of 8 or more, m is an integer of 2 or more) bits of 1-channel monochrome image data based on preset correspondence, 3 bits of n bits or more
  • a candidate association generating unit that generates a plurality of candidate associations having different numbers of gradations according to the number of bits as the association candidates;
  • An association selection unit that selects one candidate association based on the number of bits of the monochrome image data from among a plurality of candidate associations having different numbers of gradations generated by the candidate association generation unit; ,
  • An association setting unit that sets one candidate association selected by the association selection unit as the preset association
  • An image display system comprising:
  • a plurality of candidate associations having different numbers of gradations according to the number of bits are prepared in advance, and an appropriate candidate association is selected according to the number of bits of monochrome image data.
  • FIG. 1 is a schematic configuration diagram of an image display system in a first embodiment.
  • FIG. 2 is a block diagram showing a schematic configuration of the image display system in the first embodiment.
  • FIG. 3 is an explanatory diagram showing a range of candidate colors in the first embodiment.
  • FIG. 4 is a flowchart showing a conversion rule generation process in the first embodiment.
  • FIG. 5 is an explanatory diagram showing a screen displayed in the color tone selection process in the first embodiment.
  • FIG. 6 is a flowchart showing a conversion rule derivation process in the first embodiment.
  • FIG. 7 is an explanatory diagram showing a relationship between a test pattern and display characteristics in the first embodiment.
  • FIG. 8 is an explanatory diagram of generation of a standard display function in the first embodiment.
  • FIG. 9 is an explanatory diagram of generation of a standard display function in the first embodiment.
  • FIG. 10 is an explanatory diagram of generation of a standard display function in the first embodiment.
  • FIG. 11 is a flowchart showing selection of RGB values in the first embodiment.
  • FIG. 12 is an explanatory diagram showing selection of a selection color based on luminance in the first embodiment.
  • FIG. 13 is a flowchart showing an image display method according to the first embodiment.
  • FIG. 14 is an explanatory diagram showing the correspondence between the number of gradations of input image data and the LUT in the first embodiment.
  • FIG. 15 is a flowchart showing selection of RGB values in the second embodiment.
  • FIG. 16 is an explanatory diagram showing selection of a selection color based on chromaticity in the second embodiment.
  • FIG. 17 is an explanatory diagram showing selection of a selection color based on chromaticity in the second embodiment. Explanation of symbols
  • FIG. 1 is a schematic configuration diagram of an image display system 1 according to the present embodiment.
  • the FIG. 2 is a block diagram showing a schematic configuration of the image display system 1 according to the present embodiment.
  • the image display system 1 includes a display unit 2, a control unit 6, an input unit 5, and the like.
  • the display unit 2 is, for example, a monitor of a medical diagnostic apparatus.
  • the image display system 1 includes a liquid crystal panel (LCD (Liquid Crystal Display)) 210 that displays a color image based on internal signal values, and a liquid crystal drive unit 3 that drives the liquid crystal panel 210. Is provided.
  • LCD Liquid Crystal Display
  • the type of the liquid crystal panel 220 applicable to the present embodiment is not particularly limited, and a method in which the liquid crystal driving unit 3 drives the liquid crystal panel 210 is also a TN (Twisted Nematic) method, Si'N ( ⁇ iuper Twisted Nematic type, MVA (Multi-domain Vertical Alignement) type, IPS (In Plane Switching) type, etc.) can be applied.
  • liquid crystal type The Nenore 210 can reproduce 8 bits (256 levels) of each of red (R), green (G), and blue (B) using a color filter (not shown).
  • a liquid crystal panel having three colors of red (R), green (G), and blue (B) is used.
  • red (R), green (G), and blue are used.
  • three colors of yellow (Y), magenta (M), and cyan (C) may be used.
  • 6 colors of R, G, B, Y, M, and C which can be 4 colors or more, and 6 of red (Rl, R2), green (Gl, G2), and blue (B1, B2) with different color tones. Color may be used.
  • the image processing described below is not limited to the three colors red (R), green (G), and blue (B).
  • the present invention is not limited to the case where multicolor display is performed using a color filter, but can also be applied to an image display apparatus that performs multicolor display by switching light sources of multiple colors.
  • the image display system 1 includes a backlight 220 that irradiates light to the liquid crystal panel 210 from the non-observation side.
  • the backlight 220 only needs to provide light sufficient to illuminate the liquid crystal panel 210.
  • an LED, a cold cathode fluorescent tube, a hot cathode fluorescent tube, and other light emitting elements can be applied. It is preferable that display with a maximum luminance of 500 to 5000 cd / m 2 is possible so that it can be suitably used for a monitor for medical purposes.
  • the image display system 1 is provided with measuring means 4 for measuring display characteristics of an image displayed on a specific target region T of the liquid crystal panel 210.
  • Measuring means 4 is a liquid crystal Depending on the type of the channel 210, a known color sensor such as a luminance meter or a chromaticity meter can be used.
  • the measuring means 4 shown in the figure is a contact type sensor, any means that can be used for the measurement can be used.
  • the device configuration of the measuring means 4 can be applied to the image display system 1 either internally or externally.
  • the measuring means 4 is connected to an LUT generation unit 630, which will be described later. Each time the LUT generation unit 630 switches the test pattern to be displayed on the liquid crystal panel 210, the display characteristic is measured, and the measurement result is sent to the LUT generation unit 630. It is designed to output.
  • the display characteristics of the liquid crystal panel 210 are information regarding the RGB value input to the liquid crystal panel 210 and the luminance and / or chromaticity of the display light corresponding thereto.
  • color index can be used for information on luminance and / or chromaticity.
  • XYZ color system X10Y10Z10 color system
  • xyz chromaticity coordinate xlOylOzlO chromaticity coordinate
  • UCS chromaticity L * aV color system
  • L * C * h * color system L * There are uV color system, but it is not limited to it.
  • Information on luminance and / or chromaticity may be measured at a predetermined timing using the measuring means 4 by displaying a test pattern on the target region T of the liquid crystal panel 210, or at the time of factory shipment.
  • the test pattern may be displayed in 210 and the measurement result stored in memory.
  • the correspondence relationship of information on luminance and / or chromaticity with respect to RGB values may be stored as a predetermined conversion formula without using the measurement results for individual display devices.
  • the measuring means 4 measures the display characteristics, but in this embodiment, about 10% in the center of the display screen of the liquid crystal panel 210.
  • the area of the area of The measuring means 4 measures the display characteristics using the force S connected online to the image display system 1, for example, the measuring means not connected online with the image display system 1, and the measurement result is input to a keyboard or the like. It is good also as inputting into the image display system 1 via.
  • the image display system 1 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory) that stores various control programs, and a RAM (Random Access Memory) that temporarily stores image data and the like. (Neither shown) etc.
  • the control unit 6 configured to control the liquid crystal drive unit 3, the interface (I / F) 7 that connects the control unit 6 and an external device, the input unit 5, and the like are provided.
  • the interface 7 is connected to an image generation device 10 as an external device.
  • the image generation device 10 supplies, for example, 12-bit monochrome image data, and an input signal value of monochrome image data (hereinafter referred to as “P value”) is input to the interface 7.
  • P value an input signal value of monochrome image data
  • the image generation apparatus 10 is not particularly limited.
  • image processing apparatuses for various medical diagnosis apparatuses such as an X-ray diagnosis apparatus, an MRKM magnetoresonance imaging (DMR) diagnosis apparatus, and a multiple CT (Computed Tomograpny) apparatus. Painting
  • the image generation apparatus 10 supplies monochrome image data having a different number of bits depending on the type.
  • the basic operation of the image display system 1 will be described below assuming that the number of bits is 12 bits, for example.
  • the control unit 6 includes a frame memory (“FM” in FIG. 2) 610, a data processing unit 620, an LUT generation unit 630, an LUT storage unit 640, an LUT selection unit 650, and an LUT setting. Part 660 etc. are provided!
  • the frame memory 610 stores monochrome image data to which the image generation apparatus 10 is also input via the interface 7.
  • the data processing unit 620 distributes the n + m-bit 1-channel monochrome image data input from the frame memory 610 to the three RGB channels and converts them into n-bit RGB display image data.
  • the data processing unit 620 of the control unit 6 monochrome image data of n + m (n is a positive integer of 8 or more, m is a positive integer of 2 or more) bits is set in advance. Based on the mapping, it is converted to n-bit RGB display image data.
  • the data processing unit 620 distributes the input n + m-bit monochrome image data into RGB values based on the LUT as an association preset in the LUT setting unit 660. It is designed to convert to bit RGB display image data.
  • the LUT storage unit 640 a plurality of candidate LUTs having different numbers of gradations are stored in advance as LUT candidates, and stored in the LUT storage unit 640! /, Based on one candidate LUT selected by the LUT selection unit 650 and set in the LUT setting unit 660 from a plurality of candidate LUTs having different gradation numbers, the data processing unit 620 N + m-bit monochrome image data is distributed to RGB values and converted to n-bit RGB image data.
  • the liquid crystal panel 220 displays an image in three colors of R, G, and B, it is converted into RGB display image data as RGB three-channel color display image data.
  • the display device displays an image with four or more colors, it can be converted into image data with the number of channels corresponding to the number of display colors.
  • the LUT generation unit 630 corresponds to a candidate association generation unit in the present invention, and a candidate selection unit 631, a target chromaticity determination unit 632, a target luminance setting unit 633, a chromaticity calculation unit 634, and a luminance calculation unit 6 35 , A signal value determination unit 636, a test pattern holding unit 637, and the like, and generates an LUT as a correspondence based on the display characteristics of the liquid crystal panel 210.
  • the LUT generation unit 630 is connected to the LUT storage unit 640, and stores the 171 generated by the LUT generation unit 630 in the 171 storage unit 640.
  • the LUT generation unit 630 generates a plurality of candidate LUTs with different gradation levels based on the display characteristics of the liquid crystal panel 210, and stores the generated plurality of candidate LUTs with different gradation levels as LUTs. Part 640 is stored.
  • the LUT generation unit 630 generates a LUT by measuring the display characteristics of the liquid crystal panel 210, which will be described later, at the time of shipment of the image display system 1 or every certain period of time.
  • the target chromaticity determination unit 632 determines a target chromaticity corresponding to each signal of monochrome image data
  • the target luminance setting unit 633 determines a target luminance corresponding to each signal value of monochrome image data.
  • the test pattern holding unit 637 holds a plurality of uniform image data (RGB values) to be displayed as test patterns on the liquid crystal panel 210.
  • RGB values uniform image data
  • There are no particular restrictions on the number or type of test patterns to be retained. All combinations of RGB values are preferred as test patterns, which enables accurate display characteristics measurement. However, all combinations of RGB values are approximately 16.77 million colors ( 256 It is difficult to realize because there is' 3). Therefore, it is preferable to limit the combinations of RGB values to be displayed and measured in advance under predetermined conditions.
  • the LUT generation unit 630 is configured to measure the color stimulus value XYZ when the test pattern is displayed by the measuring means 4 and to input the measurement result.
  • the value represented by ⁇ ⁇ ⁇ among the color stimulus values represents luminance.
  • the chromaticity calculation unit 634 calculates chromaticity for each of the candidate RGB display image data selected by the candidate selection unit 631, and the luminance calculation unit 635 calculates the candidate selected by the candidate selection unit 631.
  • the brightness is calculated for each of the RGB display image data.
  • “candidate RGB display image data” is a candidate color because it can be selected from all combinations of displayable power display image data when RGB values are associated with each P value.
  • the chromaticity calculation unit 634 and the luminance calculation unit 635 are configured to calculate chromaticity information and luminance information corresponding to each candidate RGB display image data based on the above (Equation 1).
  • the candidate selection unit 631 selects C'2' ⁇ (2 '(m + l) ⁇ C ⁇ 2) from the RGB value combinations (2 56' 3) that become 8-bit RGB display image data. '(m + 4)) candidate RGB display image It will be selected as data (candidate colors).
  • the candidate selection unit 631 selects the reference color provisionally determined as the target gradation characteristic and its neighboring colors.
  • the method for selecting neighboring colors is to select candidate colors within the range obtained by adding an offset value within the soil ⁇ of the RGB value ( ⁇ is a natural number) for each reference color (see Fig. 3). ). Note that RGB data that falls within the range of values that cannot be displayed as a result of offset addition (signal value is less than 0 or 2 ⁇ or more) is excluded from the candidate colors. If candidate colors overlap as a result of the offset addition, the number of candidate colors selected is counted after removing the overlapping part.
  • the range of candidate colors is determined according to the number of bits (tone number) of monochrome image data (C
  • an LUT suitable for the number of gradation levels of monochrome image data can be generated.
  • the range of candidate colors is narrow, and when the number of gradations is large (the value of m is large), the range of candidate colors is wide. Since the range of candidate colors is set according to the number of gradations of monochrome image data, a LUT suitable for the number of gradations of monochrome image data can be generated.
  • the RGB value of the reference color is, for example, as shown in the following (Formula 2).
  • the RGB value of the reference color is not limited to an equal value.
  • a blue color tone it is as shown in (Equation 3) below.
  • the candidate selection unit 631 determines the value of ⁇ in consideration of the balance between the number of display gradations of the liquid crystal panel 210 and the chromaticity.
  • ⁇ may be a positive integer, but is preferably 3 or less so that the number of candidate colors does not increase excessively.
  • a is 4 or more, would be too spread selection as candidate colors, there fear force s the calculation time becomes long thereby to select a color display image data of undesirable chromaticity simultaneously.
  • the candidate selection unit 631 determines a reference color for selecting a candidate color according to the color tone selected according to the user's preference.
  • the candidate selection unit 631 may store the reference color or candidate color data corresponding to each color tone in advance using (Expression 2) or (Expression 3).
  • the candidate selection unit 631 selects only RGB display image data within the range of the soil ⁇ from the reference color and in the monochrome area as a candidate color.
  • the monochrome area is conventionally referred to as coordinates (0. 174, 0), (0.4, 0.4), ( ⁇ ', 0.4) on the CIE chromaticity coordinates. )
  • ⁇ ' is the area surrounded by the X-coordinate of the intersection of the spectral path and the straight line with a coordinate force of 0.4 in the direction of the vehicle y.
  • This is the color tone when displaying images of various blue-based monochromatic film with shear casten! /, And the actual chromaticity of each film, each light source, and each density in the film. When the measured values are taken, the measured chromaticity values are concentrated in a fairly narrow area.
  • both X and y have a margin of about ⁇ 0.01 -0.02.
  • the monochrome area is represented by coordinates (0 ⁇ 2, 0.275), (0.275, 0.225), (0.325, 0.4) on the CIE chromaticity coordinates. ), (0. 4, 0. 35).
  • the candidate selection unit 631 preferably has a tristimulus direct Y, CI of the display color of the RGB display image data.
  • 0 r and / 3 g indicate a smaller value as the luminance at the time of display, that is, the target luminance Y for each P value, is smaller in at least some luminance ranges. Can be realized.
  • the number of candidate colors selected by the candidate selection unit 631 is determined by a trade-off between the reduction of the calculation time and the number required for multi-gradation display. In general, displaying a monochrome image requires only about 1.6 million colors as candidates for candidate colors, and the computation time is increased.
  • the candidate selection unit 631 may select a candidate color for each P value of the monochrome image data every time a candidate selection process described later, and adds an offset to the reference value as described above. Not only can you select candidate colors mechanically, but you can also select and save candidate color groups in advance.
  • the signal value determination unit 636 determines the RGB value of the RGB display image data corresponding to each P value of the monochrome image data. Specifically, the signal value determination unit 636 determines one selected color from the candidate RGB display image data based on the luminance information from the target luminance setting unit 633 and the luminance calculation unit 635, and converts the RGB value to RGB. The display image data is set in association with each other.
  • the LUT storage unit 640 stores the LUT generated by the LUT generation unit 630. Specifically, a plurality of candidate LUTs having different numbers of gradations generated by the LUT generation unit 630 are stored.
  • the LUT selection unit 650 corresponds to an association selection unit in the present invention, and monochrome image data is selected from a plurality of candidate LUTs having different numbers of gradations stored in the LUT storage unit 640. Select one candidate LUT according to the number of gradations.
  • the LUT setting unit 660 corresponds to the association setting unit in the present invention, and sets one candidate LUT selected by the LUT selection unit 650 as an LUT.
  • the LUT generation process is a process for generating or correcting an LUT so that a monochrome image display having an appropriate color tone is performed in the image display system 1. For example, when the image display system 1 is shipped, the input unit 15 The process is started by the operation.
  • a conversion rule generation process as a candidate association generation process in the present invention is executed (see FIG. 4).
  • the candidate association generation process a plurality of candidate LUTs with different numbers of gradations are generated.
  • the conversion rule generation process includes a process for selecting the color tone of the display image desired by the user (step S1), a process for obtaining the display characteristics of the liquid crystal panel 2 (step S2), and a process for deriving the conversion rule. (Step S3), the candidate mapping storage process (Step S4)
  • step S1 for example, a plurality of screens having different color tones as shown in FIG. 5 are displayed on the liquid crystal panel 210, and the display unit color tone desired by the user is displayed on the input unit 5 (Fig. 5). 2) and select and store the information.
  • Fig. 5 X-ray transparent images are displayed in a total of four colors, a neutral gray color tone and three different shades of bluish tone, and the mouse pointer is displayed on the image of the color tone desired by the user.
  • a force color that is configured to select a color tone by clicking is not limited to this.
  • the candidate selection unit 631 sets the reference color using the association determined by performing the low gradation association step.
  • step S2 a correspondence relationship between the RGB value input to the liquid crystal panel 210 and information on the luminance and / or chromaticity of the display light from the liquid crystal panel 210 is acquired.
  • the image display system 1 measures the display characteristics of the liquid crystal panel 210 by the LUT generation unit 630. That is The LUT generation unit 630 sequentially displays the test patterns held in the test pattern holding unit 637 on the liquid crystal panel 210, and uses the measurement means 4 to change the color stimulus value XYZ of the CIE XYZ color system every time the test pattern display is switched. To measure.
  • the chromaticity calculation unit 634 and the luminance calculation unit 635 generate an RGB-XYZ estimation formula expressed by the above (formula 1) based on the RGB value of the test pattern and the measured color stimulus direct XYZ. .
  • the LUT generation unit 630 displays a color obtained by increasing or decreasing the RGB value of the test pattern within a predetermined range as a test pattern, and the color of the liquid crystal panel 210 It is good also as measuring a stimulus value.
  • the range of increase / decrease of the RGB value of the test pattern it is preferable to match the range of candidate colors in order to create a more accurate estimation formula.
  • step S3 the lch monochrome image signal value (m + n bits) is converted to 3ch based on the correspondence with the luminance and / or chromaticity information for the RGB value of the test pattern.
  • a candidate LUT is derived as a conversion rule to convert to the RGB value (n bits) of the.
  • the candidate LUT is generated as a conversion rule, but a conversion formula may be used. Also, a single conversion equation or LUT may be used, or a combination of multi-step conversion rules may be used.
  • step S4 the conversion rule derived in the conversion rule derivation process (step S3) is stored in the LUT storage unit 640 as a candidate LUT.
  • step S3 the details of the conversion rule derivation process (step S3) will be described with reference to FIG.
  • one-channel intermediate data that is “internal signal value” is defined. Specifically, (1) “DICOM calibration LUT” for associating P value (1 channel signal value) and internal signal value (1 channel signal value); (2) Internal signal value (1 channel signal) Value) and RGB values (3-channel signal values) to generate a “monochrome multi-gradation LUT”, and by combining these two LUTs, Are associated.
  • the LUT generation unit 630 generates a DICOM calibration conversion rule that associates the internal signal value with the P value based on the display characteristics of the liquid crystal panel 210 (step S31).
  • the DICOM calibration conversion rule is preferably generated as an LUT.
  • the display brightness for the P value corresponds to the GSDF (Grayscale Standard Display Function) defined in DICOM PS 3.14. This can be generated using a standard display function.
  • the measurement result by the measuring means 4 is output to the control unit 6, and the LUT generation unit 630 associates the RGB value with the luminance of the test pattern.
  • the LUT generation unit 630 applies 256th order to the internal signal value of 16 steps at 273 intervals among the internal signal values (0 to 4095) of 4096 gradations.
  • RGB the RGB test pattern signal values
  • 16 levels of RGB values are assigned at 17 intervals, and the measured luminance for each RGB value is associated.
  • the LUT generation unit 630 associates each internal signal value with the RGB value by proportional distribution.
  • the RGB value is not necessarily an integer.
  • the estimated measured brightness corresponding to each RGB value is calculated using, for example, the above (Equation 1) to estimate the estimated measured brightness (see Fig. 7 (b) and Fig. 8) for the internal signal value of 4096 gradations. To do. Subsequently, the LUT generation unit 630 obtains the lowest luminance and the highest luminance of the estimated actually measured luminance, and allocates the lowest luminance from the highest luminance to the P value of 4096 gradations based on the GSDF (see FIG. 9).
  • a calibration LUT that associates the internal signal value with the P value is generated.
  • the internal signal value and the P value are equivalent, and the generated calibration LUT is a proportional straight line with a slope of 1.
  • the calibration LUT is a curve corresponding to the characteristics of the liquid crystal panel 210.
  • the candidate selection unit 631 uses n (2 '(m) of RGB display image data having 256'3 signal values for each internal signal value of the monochrome image data. + 1) ⁇ C ⁇ 2 '(m + 4))
  • Candidate RGB display image data is selected (step S32). By limiting the candidate colors to the monochrome area, This is preferable because it can shorten the computation time and does not select RGB display image data outside the monochrome area.
  • an RGB value is selected based on the medium luminance of the selected candidate color (step S33). In this way, by selecting RGB values based on luminance, it is possible to achieve both image tone and number of gradations.
  • the target luminance setting unit 633 determines the target luminance Y (k) for the internal signal value k.
  • the target luminance Y (k) is the luminance of an image that will be displayed on the liquid crystal panel 210 when the P value that is the internal signal value k is input to the image display system 1. More specifically, the estimated measured brightness shown in Fig. 7 (b) is used as the target brightness Y (k).
  • the luminance calculation unit 635 calculates the luminance Y of each candidate color using the above (Equation 1) (luminance calculation step). Then, as shown in FIG. 12, the signal value determining unit 636 selects one candidate color closest to the target luminance Y (k) as a selected color (step S332).
  • the LUT generation unit 630 uses the RGB value of the selected color selected in this way as the RGB value corresponding to the internal signal value k. Subsequently, the RGB value is similarly selected for the internal signal value (k + 1) (Step S333, Step S334; No). RGB values are selected for all internal signal values of 4096 gradations, and the candidate LUT is selected. Generation ends (step S 334; Yes)
  • monochrome image data is input to the image display system 1 from the image generation device 10.
  • Step S5 The input monochrome image data is input to the control unit 6 via the interface 7.
  • the monochrome image data input to the control unit 6 is input to the LUT selection unit 650.
  • the LUT selection unit 650 is set with a table indicating the correspondence of candidate LUTs according to the bits of the monochrome image data.
  • the LUT selection unit 650 detects the number of bits of monochrome image data and selects one candidate LUT from the table based on the detection result. In the association setting step, one candidate LUT selected in the association selection step is set as the LUT (step S6). Here, it is assumed that the number of bits of the input monochrome image data is 12 bits, for example, and 12-bit candidates 171 (and 171) are selected.
  • the monochrome image data input to the control unit 6 is stored in the frame memory 610.
  • the monochrome image data stored in the frame memory 610 is sequentially output to the data processing unit 620.
  • the data processing unit 620 first converts the monochrome image data into internal signal values of 4096 gradations, and distributes the data to RGB values based on the 12-bit signal 171 selected by the LUT selection unit 650. Convert to 8-bit RGB image data (step S7).
  • step S7 the "DICOM calibration LUT" process is performed on the P value to convert it to the internal signal value k, and the internal signal value k is converted to an RGB value using! / Tune LUT ”processing.
  • the LUT processing does not need to be performed in the above-described two stages.
  • the calibration LUT and the conversion LUT from the internal signal value to the RGB value are combined, and the obtained combined LUT can be used as a one-step process. good.
  • the RGB image data converted in step S7 is output to the liquid crystal drive unit 3 (step S8), and the liquid crystal drive unit 3 displays an image based on the RGB image data to express a 12-bit monochrome image (step S8). S9).
  • the processing in the case where frame display is not performed has been described.
  • frame display can also be performed.
  • the RGB image data converted in step S7 is divided into four frame data, each frame data is stored in a second frame memory (not shown), and the stored frame data is sequentially switched. While outputting to the liquid crystal drive unit 3. By doing this, it is also possible to represent monochrome images of 12 bits or more.
  • the plurality of candidate associations having different numbers of gradations include at least one candidate association of 2 'gradations (n + 2 ⁇ k' ⁇ n + m). Therefore, even if an inexpensive color display means with a small number of drive gradations is used, the gradation reproducibility and color tone sufficient to perform medical image diagnosis for input of monochrome image data with a gradation number of four or more. It is possible to display an image having.
  • the appropriate candidate color display image data as a monochrome image is narrowed down in advance from all the combinations of innumerable displayable color display image data, the calculation time required for the signal value determination process can be reduced. This makes it possible to simplify the setting of appropriate correspondence.
  • the risk of selecting color display image data with an undesirable tone can be eliminated, and appropriate A color correspondence is obtained.
  • the LUT is generated or corrected by measuring the characteristics of the liquid crystal panel 2, it is possible to accurately reproduce a monochrome image without being affected by fluctuations in the display characteristics of the liquid crystal panel 2.
  • the candidate color is selected within the range of ⁇ from the reference color and the chromaticity is within the monochrome area, there is no possibility of selecting RGB display image data outside the monochrome area. Since the luminance value can be calculated for such RGB display image data and the signal value determination process can be performed, the calculation time can be shortened. In addition, by selecting the selected color within the monochrome area, it is possible to ensure that the selected color is within the monochrome area even if a single selected color is selected by a simple algorithm process in the signal value determination process.
  • the RGB values of the candidate colors are not limited to being equal, but are offset within the range of the soil ⁇ , so that the number of choices as candidate colors can be increased, and multi-gradation display exceeding the gradation characteristics of the display unit It is possible to display an image with high gradation resolution on the display unit.
  • the target luminance and chromaticity can be estimated from the internal signal value, and the liquid crystal panel 2 can be estimated from the RGB value. It is possible to estimate the displayed chromaticity. Then, the brightness is calculated for a plurality of candidate colors using the estimation formula, and one selected color is selected. Therefore, it is not necessary to estimate the brightness for all candidate colors. The time required for LUT correction processing can be shortened and simplified. Is possible
  • the function of the force control unit 6 provided with the control unit 6 in the image display system 1 may be assigned to a personal computer or the like.
  • a second embodiment of selecting RGB values in step S33 in FIG. 6 will be described using the flowchart in FIG. As shown in FIG. 15, the present embodiment is different from the first embodiment in that secondary selection based on chromaticity is performed after primary selection based on luminance in the signal value determination step.
  • processing different from the first embodiment will be described.
  • the candidate selection unit 631 selects C'2' ⁇ (2 '(m + l) from the combination of RGB values (256'3) that is 8-bit RGB display image data. ) ⁇ C ⁇ 2 ⁇ (m + 3)) is selected as the candidate RGB display image data (candidate color).
  • the candidate selection unit 631 selects a candidate color within a range obtained by adding an offset within ⁇ ⁇ of the RGB value of the reference color (excluding those that are less than 0 or 2 ⁇ or more after addition). It has become.
  • ⁇ may be a positive integer, but is preferably 1 or more and 3 or less so that the number of candidate colors does not increase excessively. Note that ⁇ may be made larger than in the first embodiment because selection is performed in two stages based on luminance and chromaticity.
  • the power to set the number of RGB display image data to 3 There is no particular limitation on the number, and it can be changed as appropriate.
  • the chromaticity calculation unit 635 calculates the color stimulus value XYZ using the above (Equation 1) for each of the candidate colors A to C, and calculates the chromaticity based on the calculated color stimulus value.
  • the chromaticity (L *, a *, b *) is generally a CIE L * a color system expressed using the following formulas (4) to (6) using the color stimulus value XYZ. .
  • the target chromaticity determination unit 632 sets the chromaticity of the RGB value selected for the internal signal value (k ⁇ l) of the monochrome image data as the target chromaticity (chromaticity determination step).
  • the signal value determination unit 63 6 calculates the color difference AE * ab (k— in the CIE L * a * b * color system between the target chromaticity thus obtained and the estimated chromaticities of the candidate colors A to C. 1) is obtained, and IAE * ab (k—1) among the candidate colors A to C is selected as the selected color, and is secondarily selected (step S337, chromaticity selection step). For example, as shown in FIG. 16, when the estimated chromaticity of candidate color A is the closest to the target chromaticity, candidate color A is the selected color.
  • the chromaticity of the RGB display image data associated with the monochrome image data having the internal signal value k 1 is set as the target chromaticity. Then, among the primary candidate RGB display image data corresponding to the monochrome image data of the internal signal value k, the RGB display image data having the chromaticity that minimizes the color difference from the target chromaticity is selected.
  • the number of target chromaticities used in the chromaticity selection step is not particularly limited.
  • the target chromaticity corresponding to the monochrome image data with the signal value k is associated with the chromaticity of the RGB display image data associated with the monochrome image data with the signal value k1 and the monochrome image data with the signal value k2.
  • the chromaticity of the displayed RGB display image data (see Fig. 16 and Fig. 17).
  • the color difference from the chromaticity of the RGB display image data associated with the monochrome image data of signal value k 1 out of the primary candidate RGB display image data corresponding to the monochrome image data of signal value k is IAE * ab
  • the color difference from the chromaticity of the RGB display image data associated with the monochrome image data of (k ⁇ l) I and signal value k ⁇ 2 is IAE * ab (k ⁇ 2)
  • candidate color B is selected in FIG. 16 and FIG.
  • RGB display image data When selecting RGB display image data in this way, the chromaticity variation in the signal value of adjacent monochrome image data is maximized within the range acceptable to the user, and the RGB display image data is minimized. RGB display image data will be selected alternately Thus, when viewing the liquid crystal panel 2 with normal viewing ability, it is possible to stabilize the chromaticity gradation continuity even in an image in which a low luminance portion and a high luminance portion are adjacent to each other.
  • the LUT generation unit 630 uses the RGB value of one selected color selected in this way as the RGB value corresponding to the internal signal value k. Subsequently, the RGB value is similarly selected for the internal signal value (k + 1) (Step S338, Step S339; No), and the RGB value is selected for all internal signal values of 4096 gradations. The generation of the candidate LUT is completed (step S339; Y es).
  • the image display method of the present invention from among the candidate colors of each internal signal value, one that is close to the preferred luminance is selected first, and then one color is selected based on the chromaticity.
  • the LUT can be generated or corrected by selecting the selected color, and the LUT reflecting the display characteristics of the liquid crystal panel 210 can be used.
  • the number of combinations of RGB values for one internal signal value can be increased. Therefore, multi-gradation display exceeding the gradation characteristics of the liquid crystal panel 210 is possible, and an image with high gradation resolution can be expressed.

Abstract

L'invention porte sur un procédé d'affichage d'image capable d'une expression d'échelle de gris excellente en continuités d'échelle de gris de luminance et de chromaticité, sur un programme d'affichage d'image et sur un système d'affichage d'image. Dans le procédé d'affichage d'image, les données d'image monochromatique sur un canal de n+m (n est un entier de 8 ou plus, et m est un entier de 2 ou plus) sont converties en données d'image d'affichage en couleur sur trois canaux ou plus de n bits conformément à une association prédéterminée. Le procédé comporte une étape de création d'association de candidats consistant à créer des associations de candidats avec différents niveaux d'échelle de gris correspondant au nombre de bits en tant que candidats d'association, une étape de sélection d'association consistant à sélectionner une association de candidats conformément au nombre de bits des données d'image monochromatique à partir des associations de candidats avec différents niveaux d'échelle de gris créées à l'étape de création d'association de candidats, et une étape de réglage d'association consistant à régler une association de candidats choisie à l'étape de sélection d'association en tant qu'association préréglée.
PCT/JP2007/068145 2006-10-13 2007-09-19 Procédé d'affichage d'image, programme d'affichage d'image et système d'affichage d'image WO2008044438A1 (fr)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11352954A (ja) * 1998-04-10 1999-12-24 Fuji Photo Film Co Ltd モノクロ画像表示装置
JP2000020038A (ja) * 1998-04-30 2000-01-21 Fuji Photo Film Co Ltd フラットパネルディスプレイ
JP2000347617A (ja) * 1999-06-04 2000-12-15 Fuji Photo Film Co Ltd 画像表示装置
JP2001034232A (ja) * 1999-07-15 2001-02-09 Fuji Photo Film Co Ltd 画像表示方法およびこれに用いる画像表示装置
JP2003050566A (ja) * 2001-08-06 2003-02-21 Nec Corp 液晶表示装置
WO2004093007A1 (fr) * 2003-04-14 2004-10-28 Totoku Electric Co., Ltd. Procede et dispositif d'affichage d'image monochromatique a plusieurs gradations, ordinateur, dispositif d'affichage monochromatique, adaptateur de reconversion, et carte video

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11352954A (ja) * 1998-04-10 1999-12-24 Fuji Photo Film Co Ltd モノクロ画像表示装置
JP2000020038A (ja) * 1998-04-30 2000-01-21 Fuji Photo Film Co Ltd フラットパネルディスプレイ
JP2000347617A (ja) * 1999-06-04 2000-12-15 Fuji Photo Film Co Ltd 画像表示装置
JP2001034232A (ja) * 1999-07-15 2001-02-09 Fuji Photo Film Co Ltd 画像表示方法およびこれに用いる画像表示装置
JP2003050566A (ja) * 2001-08-06 2003-02-21 Nec Corp 液晶表示装置
WO2004093007A1 (fr) * 2003-04-14 2004-10-28 Totoku Electric Co., Ltd. Procede et dispositif d'affichage d'image monochromatique a plusieurs gradations, ordinateur, dispositif d'affichage monochromatique, adaptateur de reconversion, et carte video

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