WO2010143297A1 - Projector device, image display system, and image display method - Google Patents

Projector device, image display system, and image display method Download PDF

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Publication number
WO2010143297A1
WO2010143297A1 PCT/JP2009/060771 JP2009060771W WO2010143297A1 WO 2010143297 A1 WO2010143297 A1 WO 2010143297A1 JP 2009060771 W JP2009060771 W JP 2009060771W WO 2010143297 A1 WO2010143297 A1 WO 2010143297A1
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Prior art keywords
bit string
signal
gradation
image
projector
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PCT/JP2009/060771
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French (fr)
Japanese (ja)
Inventor
修 富家
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Ｎｅｃディスプレイソリューションズ株式会社
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Priority to PCT/JP2009/060771 priority Critical patent/WO2010143297A1/en
Priority to JP2011518187A priority patent/JP5327914B2/en
Publication of WO2010143297A1 publication Critical patent/WO2010143297A1/en

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    • 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
    • G09G3/2007—Display of intermediate tones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/3147—Multi-projection 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping

Definitions

  • the present invention relates to a projector apparatus, an image display system, and an image display method that support a stack system in which a plurality of projector apparatuses project the same image on the same place.
  • Some image display systems including a plurality of projector apparatuses use a stack system in which each projector apparatus projects the same image on the same place and displays a composite image obtained by combining the images.
  • the pixels at the same pixel position of the projection image projected by each projector device overlap each other, so that the luminance of the display image is higher than the luminance of the projection image projected by one projector device.
  • the luminance of the display image is twice the luminance of the projection image projected by one projector device.
  • a general projector apparatus corrects the gradation signal in a video signal in accordance with the characteristics of the display panel of the projector apparatus.
  • the gradation processing is performed, and an image is projected based on the gradation signal subjected to the gradation processing.
  • a signal processing circuit having a buffer or the like that temporarily holds gradation signals for gradation processing is required.
  • the projector apparatus normally extracts a predetermined number of upper bits in the gradation signal and projects an image having a gradation corresponding to the extracted upper bits.
  • the upper limit of the number of bits for which gradation processing is performed is set, so that the signal processing circuit can be reduced in size and the restriction on the circuit scale for the signal processing circuit can be satisfied.
  • the number of bits of the gradation signal is M
  • the number of gradations S that can be expressed by the gradation signal is 2M .
  • the number of upper bits is M-1
  • each projector device provided in the image display system often has a configuration in which an image with the same gradation corresponding to the same gradation signal is projected. For this reason, the brightness levels of the pixels at the same pixel position in the image projected by each projector device are equal, and the number of gradations of the display image cannot be increased.
  • the image display system includes two projector devices, and each projector device projects an image corresponding to a 2-bit gradation signal.
  • the number of gradations of the projected image is 4.
  • the brightness level of the projected image is set to 4 level, 3 level, 2 level and 1 level in order from the highest.
  • the pixels at the same pixel position in the image projected by each projector device have the same luminance level, and therefore the pixels having the same luminance level are synthesized. Accordingly, the brightness level of the display image is 8 levels, 6 levels, 4 levels, and 2 levels in order from the highest, and the number of gradations of the display image is 4, which is the same as the number of gradations of the projection image by each projector device. Therefore, in the image display system using the stack method, the number of gradations of the display image cannot be increased.
  • the object of the present invention is the above-described problem, in the case where an image having a gradation corresponding to the upper bits in the gradation signal is projected, the gradation number of the display image is set to the gradation number corresponding to the original gradation signal. It is an object to provide a projector device, an image display system, and an image display method that solve the problem of being unable to approach the screen.
  • a projector device is a projector device that can be used in an image display system in which a plurality of projector devices project the same image on the same place, and is a grayscale signal composed of a plurality of bits in an input video signal.
  • Computing means for generating an adjusted bit string in which the value of the first bit string which is a predetermined number of upper bits is adjusted according to the value of the second bit string obtained by removing the first bit string from the gradation signal
  • a selection means for selecting one of the first bit string and the adjustment bit string as a projection gradation signal, and based on the projection gradation signal, according to the projection gradation signal Projecting means for projecting an image of different gradations.
  • An image display system is an image display system comprising a plurality of the projector devices, wherein each projector device projects the same image on the same location, and includes a selection means for selecting the first bit string. And a projector device having a selection means for selecting the adjustment bit string.
  • An image display method is an image display method by a projector apparatus that can be used in an image display system in which a plurality of projector apparatuses project the same image on the same location, and includes a plurality of bits in an input video signal.
  • the value of the first bit string, which is a predetermined number of higher-order bits, of the gradation signal consisting of is adjusted according to the value of the second bit string obtained by removing the first bit string from the gradation signal
  • An adjustment bit string is generated, and any one of the first bit string and the adjustment bit string is selected as a projection gradation signal, and the projection gradation signal is selected based on the projection gradation signal.
  • the image of the corresponding gradation is projected.
  • the present invention it is possible to bring the number of gradations of a display image close to the number of gradations corresponding to the original gradation signal even when an image of gradation corresponding to the upper bits in the gradation signal is projected. become.
  • FIG. 1 is a block diagram illustrating an image display system according to a first embodiment of the present invention. It is a flowchart for demonstrating operation
  • the image display system described in each of the following embodiments includes a plurality of projector devices, and each projector device projects the same image on the same location, thereby increasing the brightness of the display image. Yes.
  • FIG. 1 is a block diagram showing an image display system according to the first embodiment of the present invention.
  • the image display system includes projector apparatuses 100 and 101.
  • Projector apparatuses 100 and 101 are projector apparatuses that can be used in an image display system using a stack system. For example, the projector apparatuses 100 and 101 are stacked one on top of the other, and the projection angle is adjusted so that the same image is superimposed on the same place. Can be projected.
  • the projector device 100 includes a digital calculation unit 1, a selection unit 2, and a projection unit 3.
  • the digital calculation unit 1 is an example of calculation means.
  • the digital operation unit 1 receives a video signal of a digital signal.
  • the video signal includes a gradation signal composed of a plurality of bits.
  • the number of bits of the gradation signal is m.
  • m is an integer of 2 or more.
  • the digital video signal is an example of the input video signal.
  • the digital operation unit 1 excludes the first bit string from the gradation signal, from the gradation signal, the value of the first bit string that is the upper bit of the predetermined number of bits in the gradation signal in the input video signal
  • the adjusted bit string adjusted according to the value of the second bit string is generated.
  • the number of bits of the first bit string is mn. That is, the second bit string is n.
  • the digital operation unit 1 when the most significant bit of the second bit string corresponding to the nth bit counted from the lower order of the gradation signal is 1, the digital operation unit 1 generates an adjustment bit string obtained by adding 1 to the first bit string, When the most significant bit of the second bit string is 0, the first bit string is generated as it is as the adjustment bit string.
  • the digital arithmetic unit 1 adds 1 to the first bit string to generate an adjusted bit string
  • the first bit string may be generated as it is as the adjustment bit string.
  • the selection unit 2 selects either the first bit string or the adjustment bit string as a display gradation signal.
  • the signal selected by the selection unit 2 is set in advance by a user or the like.
  • the projection unit 3 projects an image having a gradation corresponding to the display gradation signal selected by the selection unit 2.
  • the projector device 101 includes a digital calculation unit 11, a selection unit 12, and a projection unit 13. Note that each of the digital calculation unit 11, the selection unit 12, and the projection unit 13 has the same function as each of the digital calculation unit 1, the selection unit 2, and the projection unit 3.
  • the selection unit 12 is set to select a bit string different from the bit string selected by the selection unit 2. For example, the selection unit 12 selects the adjustment bit string when the selection unit 2 selects the first bit string, and selects the first bit string when the selection unit 2 selects the adjustment bit string.
  • the image display system includes a projector device having a selection unit that selects the first bit string, and a projector device that has a selection unit that selects the adjustment bit string.
  • FIG. 2 is a flowchart for explaining the operation of the projector device 100.
  • the video signal is input to the digital calculation unit 1 and the selection unit 2.
  • step S101 the digital operation unit 1 checks the value of the nth bit from the lower order of the gradation signal in the input video signal, and determines whether the value of the nth bit is 1. When the value of the nth bit is 1, the digital arithmetic unit 1 determines that the most significant bit of the second bit string is 1, and when the value of the nth bit is 0, the most significant bit of the second bit string Is determined to be 0.
  • the digital operation unit 1 executes step S102 if the most significant bit of the second bit string is 1, and executes step S104 if the most significant bit of the second bit string is 0.
  • step S102 the digital operation unit 1 determines whether or not all the bits of the first bit string, which is the upper mn bit signal in the gradation signal, are 1. If all the bits are not 1, the digital operation unit 1 executes step S103, and if all the bits are 1, executes step S104.
  • step S103 the digital operation unit 1 adds 1 to the first bit string to generate an adjustment bit string, and inputs the adjustment bit string to the selection unit 2.
  • the selection unit 2 executes Step S105.
  • step S104 the digital operation unit 1 generates the first bit string in the gradation signal as the adjustment bit string.
  • the digital calculation unit 1 inputs a video signal including an adjustment bit string instead of the gradation signal to the selection unit 2 as an adjustment video signal.
  • the selection unit 2 executes Step S105.
  • step S105 the selection unit 2 deletes the second bit string from the gradation signal in the input video signal, and generates a video signal including the first bit string instead of the gradation signal.
  • the selection unit 2 selects one of the generated video signal and the adjusted video signal as a display video signal.
  • the first bit string or the adjustment bit string included in the display video signal becomes the display gradation signal.
  • the selection unit 2 inputs the selected display video signal to the projection unit 3.
  • the projection unit 3 executes Step S106.
  • step S106 the projection unit 3 projects an image having a gradation corresponding to the display gradation signal included in the input display video signal based on the display video signal, and ends the operation.
  • the operation of the projector apparatus 101 may be performed by replacing the digital calculation unit 1, the selection unit 2, and the projection unit 3 with the digital calculation unit 11, the selection unit 12, and the projection unit 13 in the operation described with reference to FIG. .
  • the digital operation unit 1 adjusts the value of the first bit string in the gradation signal according to the least significant bit (LSB) of the 4-bit gradation signal.
  • LSB least significant bit
  • the selection unit 2 of the projector device 100 selects the first bit string as a display gradation signal.
  • the display gradation signal is a 3-bit signal.
  • FIG. 3A is an explanatory diagram schematically showing the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 100.
  • the horizontal axis indicates the signal level
  • the vertical axis indicates the luminance level.
  • the scales on the outer side of the horizontal axis and the vertical axis are scales indicating values that can be expressed when the display gradation signal is a 4-bit signal
  • the scales on the inner side thereof are the scales for display. It is a scale showing values that can be expressed when it is a 3-bit signal.
  • the gradation that can be expressed in the projection image by the projector device 100 is half that when the gradation signal is used as it is as the display gradation signal.
  • the signal level of the display gradation signal and the brightness of the projection image by the projector apparatus 101 are assumed.
  • the relationship with the level is the relationship shown in FIG. 3B, which is the same as the relationship shown in FIG. 3A.
  • the selection unit 12 selects the first bit string as the display gradation signal
  • the relationship between the signal level of the display gradation signal and the luminance level of the display image is the relationship shown in FIG. 3C. It becomes.
  • the brightness of the display image is twice that of the projection image projected by each projector apparatus, but the gradation of the display image has the same eight levels as the gradation of the projection image projected by each projector apparatus. Therefore, the brightness of the display image is improved, but the number of gradations of the display image does not change.
  • the selection unit 12 selects the adjustment bit string as the display gradation signal
  • the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 101 is the relationship shown in FIG. 4A. It becomes.
  • the brightness level of the projected image by the projector apparatus 101 has the same eight levels of gradation as the brightness level of the projected image by the projector apparatus 100.
  • the signal level at which the brightness level of the projection image by the projector device 101 changes is different from the signal level at which the brightness level of the projection image by the projector device 100 changes.
  • the selection unit 12 selects the adjustment bit string
  • the relationship between the signal level of the display gradation signal and the luminance level of the display image of the image display system is the relationship shown in FIG. 4B.
  • the selection unit 12 selects the adjustment bit string, the number of gradations of the display image of the image display system is 15, which approaches 16, which is the number of gradations corresponding to the gradation signal.
  • the horizontal axis indicates the signal level
  • the vertical axis indicates the luminance level
  • the scales on the outer side of the horizontal axis and the vertical axis are scales indicating values that can be expressed when the display gradation signal is a 4-bit signal
  • the scales on the inner side thereof are the scales for display. It is a scale showing values that can be expressed when it is a 3-bit signal.
  • the digital operation unit 1 calculates the value of the first bit string, which is a predetermined number of higher-order bits, from the gradation signal, among the gradation signals composed of a plurality of bits in the video signal.
  • An adjusted bit string adjusted according to the value of the second bit string excluding the one bit string is generated.
  • the selection unit 2 selects one of the first bit string and the adjustment bit string as a projection gradation signal. Based on the projection gradation signal, the projection unit 3 projects an image having a gradation corresponding to the projection gradation signal.
  • one of the first bit string in the gradation signal and the adjustment bit string in which the value of the first bit string is adjusted is selected as the projection gradation signal, and the selected projection gradation is selected.
  • An image having a gradation corresponding to the signal is projected.
  • the number of gradations of the display image is 1. More than the number of gradations of the projected image projected by one projector apparatus. Therefore, even when an image having a gradation corresponding to the upper bits in the gradation signal is projected, the number of gradations of the display image can be brought close to the number of gradations corresponding to the original gradation signal.
  • the digital operation unit 1 adds 1 to the first bit string to generate an adjusted bit string.
  • the second bit string in the gradation signal which is information lost when the image is projected, can be appropriately reflected in the adjustment bit string, and an appropriate gradation can be expressed in the display image. It becomes possible.
  • the digital arithmetic unit 1 adds 1 to the first bit string when all the bits of the first bit string are not 1 and the most significant bit of the second bit string is 1. To generate the adjustment bit string.
  • the image display system includes the projector device 100 having the selection unit 2 that selects the first bit string, and the projector device 101 that has the selection unit 12 that selects the adjustment bit string.
  • the number of gradations of the display image is larger than the number of gradations of the projection image projected by one projector device. Therefore, even when an image having a gradation corresponding to the upper bits in the gradation signal is projected, the number of gradations of the display image can be brought close to the number of gradations corresponding to the original gradation signal.
  • FIG. 5 is a block diagram showing the image display system of the present embodiment.
  • the image display system includes projector apparatuses 100 and 101, similarly to the configuration shown in FIG.
  • the projector device 100 includes a digital calculation unit 1, a selection unit 2, a projection unit 3, and a digital input unit 4.
  • the projection unit 3 includes a digital signal processing unit 5, a panel drive unit 6, and a panel unit 7.
  • the digital input unit 4 receives a digital video signal from the outside.
  • the digital input unit 4 inputs the input video signal to the digital calculation unit 1 and the selection unit 2.
  • the digital signal processing unit 5 performs digital signal processing on the display video signal selected by the selection unit 2.
  • the digital signal processing is gradation processing for correcting the gradation corresponding to the display gradation signal in the display video signal according to the characteristics of the panel unit 7. Note that as the digital signal processing, scaling processing for enlarging and reducing an image indicated by the video signal, distortion correction processing for correcting distortion of the projected image, and the like may be performed.
  • the digital signal processing is not limited to these processes, and can be changed as appropriate.
  • the panel drive unit 6 generates a drive signal for driving the panel unit 7 in accordance with the display video signal subjected to the digital signal processing by the digital signal processing unit 5, and inputs the drive signal to the panel unit 7. .
  • the panel unit 7 is, for example, a liquid crystal panel or a DMD (Digital Micromirror Device) panel, and reflects or transmits light from a light source (not shown) according to a driving signal input from the panel driving unit 6 for display. An image having a gradation corresponding to the gradation signal for use is projected.
  • a DMD Digital Micromirror Device
  • the projector device 101 also includes a digital calculation unit 11, a selection unit 12, a projection unit 13, and a digital input unit 14.
  • the projection unit 13 includes a digital signal processing unit 15, a panel driving unit 16, and a panel unit 17.
  • Each of the digital input unit 14, the digital signal processing unit 15, the panel driving unit 16, and the panel unit 17 has the same functions as the digital input unit 4, the digital signal processing unit 5, the panel driving unit 6 and the panel unit 7, respectively.
  • FIG. 6 is a flowchart for explaining the operation of the projector device 100 according to the present embodiment.
  • step S201 when a digital video signal is input, the digital input unit 4 inputs the video signal to the digital calculation unit 1 and the selection unit 2.
  • the digital calculation unit 1 executes Step S202.
  • the digital input unit 4 may extract the first bit string from the gradation signal in the video signal, and the selection unit 2 may receive the video signal including the first bit string instead of the gradation signal.
  • the digital input unit 4 has input the video signal including the first bit string to the selection unit 2 instead of the gradation signal.
  • step S202 the digital arithmetic unit 1 calculates the second bit value obtained by excluding the first bit string from the gradation signal, from the gradation signal in the video signal.
  • An adjusted bit string is generated by adjusting according to the bit string.
  • the digital calculation unit 1 inputs a video signal including an adjustment bit string instead of the gradation signal to the selection unit 2 as an adjustment video signal.
  • the selection unit 2 executes Step S203.
  • step S202 is the same as the processing described in steps S101 to S104 in FIG.
  • step S203 the selection unit 2 selects either the video signal or the adjusted video signal as a display video signal, and inputs the selected display video signal to the digital signal processing unit 5.
  • the digital signal processing unit 5 executes Step S204.
  • step S204 the digital signal processing unit 5 performs digital signal processing on the display video signal, and inputs the display video signal subjected to the digital signal processing to the panel driving unit 6.
  • the panel driving unit 6 executes Step S205.
  • step S205 the panel drive unit 6 generates a drive signal for driving the panel unit 7 according to the display video signal, and inputs the drive signal to the panel unit 7.
  • the panel unit 7 reflects or transmits light from the light source according to the drive signal, and projects an image having a gradation according to the display gradation signal in the display video signal. To do.
  • the image display system of the present embodiment has the same configuration as that shown in FIG.
  • the digital arithmetic units 1 and 11 adjust the value of the first bit string as follows.
  • the digital operation unit 1 adds ⁇ 1 to the first bit string to generate an adjustment bit string, and when the most significant bit of the second bit string is 1.
  • the first bit string is generated as an adjusted bit string as it is.
  • the digital arithmetic unit 1 adds ⁇ 1 to the first bit string to obtain the adjusted bit string.
  • the first bit string may be generated as it is as the adjustment bit string.
  • m is 4 and n is 1.
  • the selection unit 2 of the projector device 100 selects the first bit string as a display gradation signal.
  • the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 100 is the same as the relationship shown in FIG. 3A.
  • the selection unit 12 of the projector device 101 selects the adjustment bit string
  • the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 101 is the relationship shown in FIG. 7A.
  • the luminance level of the projected image by the projector apparatus 101 has the same eight-level gradation as that of the projected image by the projector apparatus 100.
  • the signal level at which the brightness level of the projection image by the projector device 101 changes is different from the signal level at which the brightness level of the projection image by the projector device 100 changes.
  • the selection unit 12 selects the adjustment bit string, the relationship between the signal level of the display gradation signal and the luminance level of the projected image projected by the image display system is as shown in FIG. 7B.
  • the selection unit 12 selects the adjustment bit string, the number of gradations of the projected image projected by the image display system is 15, which approaches 16 which is the number of gradations corresponding to the gradation signal. .
  • the horizontal axis indicates the signal level
  • the vertical axis indicates the luminance level.
  • the scales on the outer side of the horizontal axis and the vertical axis are scales indicating values that can be expressed by a 4-bit signal
  • the scales on the inner side are scales that indicate values that can be expressed by a 3-bit signal.
  • the digital arithmetic unit 1 adds ⁇ 1 to the first bit string to generate an adjusted bit string.
  • the second bit string in the gradation signal which is information lost when the image is projected, can be appropriately reflected in the adjustment bit string, and an appropriate gradation can be expressed in the display image. It becomes possible.
  • the digital arithmetic unit 1 adds ⁇ 1 to the first bit string when all the bits of the first bit string are not 0 and the most significant bit of the second bit string is 0. To generate the adjusted bit string.
  • FIG. 8 is a block diagram showing the image display system of the present embodiment.
  • the image display system includes projector apparatuses 100 and 101.
  • the projector device 100 includes an A / D conversion unit 8 instead of the digital input unit 4 having the configuration shown in FIG. Further, the projector device 101 includes an A / D conversion unit 18 instead of the digital input unit 4 having the configuration shown in FIG.
  • a video signal which is an analog signal is input to the A / D converter 8.
  • the A / D conversion unit 8 converts the video signal into a digital signal, and generates a digital signal video signal including an m-bit gradation signal.
  • the A / D conversion unit 8 inputs the digital video signal to the digital calculation unit 1 and the selection unit 2. Note that the A / D converter 8 may input a video signal having the first bit string of the gradation signal to the selection unit 2 instead of the gradation signal.
  • the A / D converter 18 has a function equivalent to that of the A / D converter 8.
  • the A / D converter 8 converts it into a digital signal.

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Abstract

Provided is a projector device which can solve the problem that the number of gradations of a display image is reduced.  A digital calculation unit (1) generates an adjustment bit string by adjusting a value of a first bit string as a predetermined number of the most significant bits among gradation signals formed by a plurality of bits in a video signal, in accordance with a value of a second bit string obtained by excluding the first bit string from the gradation signal.  A selection unit (2) selects the first bit string or the adjustment bit string as a projection gradation signal.  A projection unit (3) projects the gradation image based on the projection gradation signal in accordance with the projection gradation signal.

Description

プロジェクタ装置、画像表示システムおよび画像表示方法Projector device, image display system, and image display method
　本発明は、複数台のプロジェクタ装置が同じ画像を同じ場所に重ねて投射するスタック方式に対応したプロジェクタ装置、画像表示システムおよび画像表示方法に関する。 The present invention relates to a projector apparatus, an image display system, and an image display method that support a stack system in which a plurality of projector apparatuses project the same image on the same place.
　複数台のプロジェクタ装置を備えた画像表示システムには、各プロジェクタ装置が同じ画像を同じ場所に重ねて投射して、それらの画像を合成した合成画像を表示するスタック方式を用いたものがある。 Some image display systems including a plurality of projector apparatuses use a stack system in which each projector apparatus projects the same image on the same place and displays a composite image obtained by combining the images.
　スタック方式では、各プロジェクタ装置が投射する投射画像の同じ画素位置にある画素が重なり合うため、表示画像の輝度は、１台のプロジェクタ装置が投射する投射画像の輝度より高くなる。 In the stack method, the pixels at the same pixel position of the projection image projected by each projector device overlap each other, so that the luminance of the display image is higher than the luminance of the projection image projected by one projector device.
　例えば、画像表示システムが２台のプロジェクタ装置を備える場合、表示画像の輝度は、１台のプロジェクタ装置が投射する投射画像の輝度の２倍になる。 For example, when the image display system includes two projector devices, the luminance of the display image is twice the luminance of the projection image projected by one projector device.
　なお、スタック方式を用いた画像表示システムは、例えば、特許文献１、特許文献２および特許文献３などに記載されている。 Note that image display systems using the stack method are described in, for example, Patent Document 1, Patent Document 2, and Patent Document 3.
　また、画像表示システムに使用するか否かに関わらず、一般的なプロジェクタ装置では、映像信号内の階調信号に対して、その階調信号をプロジェクタ装置の表示パネルの特性などに応じて補正する階調処理が行われ、その階調処理が行われた階調信号に基づいて画像が投射される。 Regardless of whether or not it is used in an image display system, a general projector apparatus corrects the gradation signal in a video signal in accordance with the characteristics of the display panel of the projector apparatus. The gradation processing is performed, and an image is projected based on the gradation signal subjected to the gradation processing.
　階調処理を行うためには、階調処理を行う階調信号を一時的に保持するバッファなどを有する信号処理回路が必要となる。階調処理が行われる階調信号のビット数が多いほど、バッファなどを大きくする必要があるため、信号処理回路が大きくなる。したがって、階調信号のビット数がある値以上になると、信号処理回路にある程度以上の大きさが必要となり、信号処理回路に対する回路規模の制約などが満たされなくなることがある。 In order to perform gradation processing, a signal processing circuit having a buffer or the like that temporarily holds gradation signals for gradation processing is required. The larger the number of bits of the gradation signal for which gradation processing is performed, the larger the buffer and the like, and thus the larger the signal processing circuit. Therefore, when the number of bits of the gradation signal exceeds a certain value, the signal processing circuit needs to have a certain size or more, and the circuit scale restriction on the signal processing circuit may not be satisfied.
　このため、プロジェクタ装置は、通常、階調信号内の予め定められた数の上位ビットを抽出し、その抽出した上位ビットに応じた階調の画像を投射する。これにより、階調処理が行われるビット数の上限が設定されるので、信号処理回路を小型化することが可能になり、信号処理回路に対する回路規模の制約を満たすことが可能になる。 For this reason, the projector apparatus normally extracts a predetermined number of upper bits in the gradation signal and projects an image having a gradation corresponding to the extracted upper bits. As a result, the upper limit of the number of bits for which gradation processing is performed is set, so that the signal processing circuit can be reduced in size and the restriction on the circuit scale for the signal processing circuit can be satisfied.
特開２００３－１２５３１７号公報JP 2003-125317 A 特開２００６－５４６３２号公報JP 2006-54632 A 特開２００８－２０８２２号公報JP 2008-20822 A
　階調信号内の上位ビットに応じた階調の画像が投射される場合には、階調信号の本来のビット数より少ないビット数に応じた階調の画像が投射されることもある。この場合、投射画像の階調数が減少するという問題があった。 When an image having a gradation corresponding to the upper bits in the gradation signal is projected, an image having a gradation corresponding to a smaller number of bits than the original number of bits of the gradation signal may be projected. In this case, there is a problem that the number of gradations of the projected image is reduced.
　例えば、階調信号のビット数をＭとすると、階調信号で表現できる階調数Ｓは２Ｍとなる。また、上位ビットのビット数をＭ－１とすると、その上位ビットで表現できる階調数は、２Ｍ－１＝Ｓ／２となり、階調信号で表現できる階調数の半分になる。 For example, if the number of bits of the gradation signal is M, the number of gradations S that can be expressed by the gradation signal is 2M . When the number of upper bits is M-1, the number of gradations that can be expressed by the upper bits is 2 M-1 = S / 2, which is half the number of gradations that can be expressed by the gradation signal.
　また、スタック方式を用いた画像表示システムでは、画像表示システムが備える各プロジェクタ装置が、同じ階調信号に応じた同じ階調の画像を投射する構成とすることが多い。このため、各プロジェクタ装置が投射する画像の同じ画素位置にある画素の輝度レベルが等しくなり、表示画像の階調数を増やすことができない。 Further, in an image display system using the stack method, each projector device provided in the image display system often has a configuration in which an image with the same gradation corresponding to the same gradation signal is projected. For this reason, the brightness levels of the pixels at the same pixel position in the image projected by each projector device are equal, and the number of gradations of the display image cannot be increased.
　例えば、画像表示システムが２台のプロジェクタ装置を備え、各プロジェクタ装置が２ビットの階調信号に応じた画像を投射するものとする。この場合、投射画像の階調数は４となる。ここで、投射画像の輝度レベルを高い方から順に４レベル、３レベル、２レベルおよび１レベルとする。 For example, it is assumed that the image display system includes two projector devices, and each projector device projects an image corresponding to a 2-bit gradation signal. In this case, the number of gradations of the projected image is 4. Here, the brightness level of the projected image is set to 4 level, 3 level, 2 level and 1 level in order from the highest.
　上記の画像表示システムでは、各プロジェクタ装置が投射する画像の同じ画素位置にある画素の輝度レベルが等しいため、同じ輝度レベルの画素同士が合成される。したがって、表示画像の輝度レベルは高い方から順に８レベル、６レベル、４レベルおよび２レベルとなり、表示画像の階調数は、各プロジェクタ装置による投射画像の階調数と同じ４となる。よって、スタック方式を用いた画像表示システムでは、表示画像の階調数を増やすことができない。 In the above image display system, the pixels at the same pixel position in the image projected by each projector device have the same luminance level, and therefore the pixels having the same luminance level are synthesized. Accordingly, the brightness level of the display image is 8 levels, 6 levels, 4 levels, and 2 levels in order from the highest, and the number of gradations of the display image is 4, which is the same as the number of gradations of the projection image by each projector device. Therefore, in the image display system using the stack method, the number of gradations of the display image cannot be increased.
　したがって、上位ビットに応じた階調の画像が投射されるプロジェクタ装置が、スタック方式を用いた画像表示システムに使用されても、表示画像の階調数を増やすことができないので、表示画像の階調数を本来の階調信号に応じた階調数に近づけることができない。 Therefore, even if a projector device that projects an image with a gradation corresponding to the upper bits is used in an image display system using a stack method, the number of gradations of the display image cannot be increased. The key number cannot be brought close to the number of gradations corresponding to the original gradation signal.
　本発明の目的は、上記の課題である、階調信号内の上位ビットに応じた階調の画像が投射される場合、表示画像の階調数を本来の階調信号に応じた階調数に近づけることができないという問題を解決するプロジェクタ装置、画像表示システムおよび画像表示方法を提供することである。 The object of the present invention is the above-described problem, in the case where an image having a gradation corresponding to the upper bits in the gradation signal is projected, the gradation number of the display image is set to the gradation number corresponding to the original gradation signal. It is an object to provide a projector device, an image display system, and an image display method that solve the problem of being unable to approach the screen.
　本発明によるプロジェクタ装置は、複数台のプロジェクタ装置が同じ画像を同じ場所に重ねて投射する画像表示システムに使用可能なプロジェクタ装置であって、入力映像信号内の複数ビットからなる階調信号のうち、予め定められた数の上位ビットである第一のビット列の値を、前記階調信号から前記第一のビット列を除いた第二のビット列の値に応じて調整した調整ビット列を生成する演算手段と、前記第一のビット列と前記調整ビット列とのうちのいずれかの信号を投射用階調信号として選択する選択手段と、前記投射用階調信号に基づいて、該投射用階調信号に応じた階調の画像を投射する投射手段と、を有する。 A projector device according to the present invention is a projector device that can be used in an image display system in which a plurality of projector devices project the same image on the same place, and is a grayscale signal composed of a plurality of bits in an input video signal. Computing means for generating an adjusted bit string in which the value of the first bit string which is a predetermined number of upper bits is adjusted according to the value of the second bit string obtained by removing the first bit string from the gradation signal And a selection means for selecting one of the first bit string and the adjustment bit string as a projection gradation signal, and based on the projection gradation signal, according to the projection gradation signal Projecting means for projecting an image of different gradations.
　また、本発明による画像表示システムは、前記プロジェクタ装置を複数台備え、各プロジェクタ装置が同じ画像を同じ場所に重ねて投射する画像表示システムであって、前記第一のビット列を選択する選択手段を有するプロジェクタ装置と、前記調整ビット列を選択する選択手段を有するプロジェクタ装置と、を備える。 An image display system according to the present invention is an image display system comprising a plurality of the projector devices, wherein each projector device projects the same image on the same location, and includes a selection means for selecting the first bit string. And a projector device having a selection means for selecting the adjustment bit string.
　また、本発明による画像表示方法は、複数台のプロジェクタ装置が同じ画像を同じ場所に重ねて投射する画像表示システムに使用可能なプロジェクタ装置による画像表示方法であって、入力映像信号内の複数ビットからなる階調信号のうち、予め定められた数の上位ビットである第一のビット列の値を、前記階調信号から前記第一のビット列を除いた第二のビット列の値に応じて調整した調整ビット列を生成し、前記第一のビット列と前記調整ビット列とのうちのいずれかの信号を投射用階調信号として選択し、前記投射用階調信号に基づいて、該投射用階調信号に応じた階調の画像を投射する。 An image display method according to the present invention is an image display method by a projector apparatus that can be used in an image display system in which a plurality of projector apparatuses project the same image on the same location, and includes a plurality of bits in an input video signal. The value of the first bit string, which is a predetermined number of higher-order bits, of the gradation signal consisting of is adjusted according to the value of the second bit string obtained by removing the first bit string from the gradation signal An adjustment bit string is generated, and any one of the first bit string and the adjustment bit string is selected as a projection gradation signal, and the projection gradation signal is selected based on the projection gradation signal. The image of the corresponding gradation is projected.
　本発明によれば、階調信号内の上位ビットに応じた階調の画像が投射される場合でも、表示画像の階調数を本来の階調信号に応じた階調数に近づけることが可能になる。 According to the present invention, it is possible to bring the number of gradations of a display image close to the number of gradations corresponding to the original gradation signal even when an image of gradation corresponding to the upper bits in the gradation signal is projected. become.
本発明の第一の実施形態の画像表示システムを示したブロック図である。1 is a block diagram illustrating an image display system according to a first embodiment of the present invention. 第一の実施形態におけるプロジェクタ装置の動作を説明するためのフローチャートである。It is a flowchart for demonstrating operation | movement of the projector apparatus in 1st embodiment. 表示用階調信号の信号レベルと投射画像の輝度レベルの関係の一例を示した説明図である。It is explanatory drawing which showed an example of the relationship between the signal level of the gradation signal for a display, and the luminance level of a projection image. 表示用階調信号レベルと投射画像の輝度レベルの関係の他の例を示した説明図である。It is explanatory drawing which showed the other example of the relationship between the gradation signal level for a display, and the luminance level of a projection image. 表示用階調信号レベルと表示画像の輝度レベルの関係の一例を示した説明図である。It is explanatory drawing which showed an example of the relationship between the gradation signal level for a display, and the luminance level of a display image. 表示用階調信号の信号レベルと投射画像の輝度レベルの関係の他の例を示した説明図である。It is explanatory drawing which showed the other example of the relationship between the signal level of the gradation signal for a display, and the luminance level of a projection image. 表示用階調信号の信号レベルと表示画像の輝度レベルの関係の他の例を示した説明図である。It is explanatory drawing which showed the other example of the relationship between the signal level of the gradation signal for a display, and the luminance level of a display image. 本発明の第二の実施形態の画像表示システムを示したブロック図である。It is the block diagram which showed the image display system of 2nd embodiment of this invention. 第二の実施形態におけるプロジェクタ装置の動作を説明するためのフローチャートである。It is a flowchart for demonstrating operation | movement of the projector apparatus in 2nd embodiment. 表示用階調信号の信号レベルと投射画像の輝度レベルの関係の一例を示した説明図である。It is explanatory drawing which showed an example of the relationship between the signal level of the gradation signal for a display, and the luminance level of a projection image. 表示用階調信号の信号レベルと表示画像の輝度レベルの関係の他の例を示した説明図である。It is explanatory drawing which showed the other example of the relationship between the signal level of the gradation signal for a display, and the luminance level of a display image. 本発明の第四の実施形態の画像表示システムを示したブロック図である。It is the block diagram which showed the image display system of 4th embodiment of this invention.
　以下、本発明の実施形態について適宜図面を参照しながら説明する。なお、以下の説明では、同じ機能を有する構成には同じ符号を付け、その説明を省略する場合がある。 Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. In the following description, components having the same function may be denoted by the same reference numerals and description thereof may be omitted.
　以下の各実施形態で説明する画像表示システムは、複数台のプロジェクタ装置を備え、各プロジェクタ装置が同じ画像を同じ場所に重ねて投射することで、表示画像の輝度を高くするスタック方式を用いている。また、画像表示システムに使用されるプロジェクタ装置は、２台あるとしている。しかしながら、画像表示システムに使用されるプロジェクタ装置は、３台以上あってもよい。 The image display system described in each of the following embodiments includes a plurality of projector devices, and each projector device projects the same image on the same location, thereby increasing the brightness of the display image. Yes. In addition, there are two projector devices used in the image display system. However, there may be three or more projector devices used in the image display system.
　図１は、本発明の第一の実施形態の画像表示システムを示したブロック図である。図１において、画像表示システムは、プロジェクタ装置１００および１０１を有する。 FIG. 1 is a block diagram showing an image display system according to the first embodiment of the present invention. In FIG. 1, the image display system includes projector apparatuses 100 and 101.
　プロジェクタ装置１００および１０１は、スタック方式を用いた画像表示システムに使用可能なプロジェクタ装置であり、例えば、上下に積み重ねて設置され、投射角度などが調整されることで、同じ画像を同じ場所に重ねて投射することが可能になる。 Projector apparatuses 100 and 101 are projector apparatuses that can be used in an image display system using a stack system. For example, the projector apparatuses 100 and 101 are stacked one on top of the other, and the projection angle is adjusted so that the same image is superimposed on the same place. Can be projected.
　プロジェクタ装置１００は、デジタル演算部１と、選択部２と、投射部３とを有する。 The projector device 100 includes a digital calculation unit 1, a selection unit 2, and a projection unit 3.
　デジタル演算部１は、演算手段の一例である。デジタル演算部１には、デジタル信号の映像信号が入力される。映像信号は、複数ビットからなる階調信号を含む。以下、階調信号のビット数をｍとする。なお、ｍは、２以上の整数である。また、デジタル信号の映像信号は、入力映像信号の一例である。 The digital calculation unit 1 is an example of calculation means. The digital operation unit 1 receives a video signal of a digital signal. The video signal includes a gradation signal composed of a plurality of bits. Hereinafter, the number of bits of the gradation signal is m. Note that m is an integer of 2 or more. The digital video signal is an example of the input video signal.
　デジタル演算部１は、その入力された映像信号内の階調信号のうち、予め定められたビット数の上位ビットである第一のビット列の値を、その階調信号から第一のビット列を除いた第二のビット列の値に応じて調整した調整ビット列を生成する。以下、第一のビット列のビット数をｍ－ｎとする。つまり、第二のビット列をｎとする。 The digital operation unit 1 excludes the first bit string from the gradation signal, from the gradation signal, the value of the first bit string that is the upper bit of the predetermined number of bits in the gradation signal in the input video signal The adjusted bit string adjusted according to the value of the second bit string is generated. Hereinafter, the number of bits of the first bit string is mn. That is, the second bit string is n.
　例えば、デジタル演算部１は、階調信号の下位から数えてｎビット目に当たる、第二のビット列の最上位ビットが１の場合、第一のビット列に１を加算した調整ビット列を生成し、第二のビット列の最上位ビットが０の場合、第一のビット列をそのまま調整ビット列として生成する。 For example, when the most significant bit of the second bit string corresponding to the nth bit counted from the lower order of the gradation signal is 1, the digital operation unit 1 generates an adjustment bit string obtained by adding 1 to the first bit string, When the most significant bit of the second bit string is 0, the first bit string is generated as it is as the adjustment bit string.
　また、デジタル演算部１は、第一のビット列の全てのビットが１でなく、かつ、第二のビット列の最上位ビットが１の場合、第一のビット列に１を加算して調整ビット列を生成し、第一のビット列の全てのビットが１の場合、および、第二のビット列の最上位ビットが１の場合、その第一のビット列をそのまま調整ビット列として生成してもよい。 In addition, when all the bits of the first bit string are not 1 and the most significant bit of the second bit string is 1, the digital arithmetic unit 1 adds 1 to the first bit string to generate an adjusted bit string However, when all the bits of the first bit string are 1, and when the most significant bit of the second bit string is 1, the first bit string may be generated as it is as the adjustment bit string.
　選択部２は、第一のビット列と調整ビット列とのうちのいずれかを表示用階調信号として選択する。選択部２が選択する信号は、ユーザなどにて予め設定されるものとする。 The selection unit 2 selects either the first bit string or the adjustment bit string as a display gradation signal. The signal selected by the selection unit 2 is set in advance by a user or the like.
　投射部３は、選択部２にて選択された表示用階調信号に応じた階調の画像を投射する。 The projection unit 3 projects an image having a gradation corresponding to the display gradation signal selected by the selection unit 2.
　プロジェクタ装置１０１は、デジタル演算部１１と、選択部１２と、投射部１３とを含む。なお、デジタル演算部１１、選択部１２および投射部１３のそれぞれは、デジタル演算部１、選択部２および投射部３のそれぞれと同じ機能を有する。 The projector device 101 includes a digital calculation unit 11, a selection unit 12, and a projection unit 13. Note that each of the digital calculation unit 11, the selection unit 12, and the projection unit 13 has the same function as each of the digital calculation unit 1, the selection unit 2, and the projection unit 3.
　また、選択部１２は、選択部２が選択するビット列とは別のビット列を選択するように設定されているものとする。例えば、選択部１２は、選択部２が第一のビット列を選択する場合、調整ビット列を選択し、選択部２が調整ビット列を選択する場合、第一のビット列を選択する。 Suppose that the selection unit 12 is set to select a bit string different from the bit string selected by the selection unit 2. For example, the selection unit 12 selects the adjustment bit string when the selection unit 2 selects the first bit string, and selects the first bit string when the selection unit 2 selects the adjustment bit string.
　これにより、画像表示システムは、第一のビット列を選択する選択部を有するプロジェクタ装置と、調整ビット列を選択する選択部を有するプロジェクタ装置と、を備えることになる。 Thus, the image display system includes a projector device having a selection unit that selects the first bit string, and a projector device that has a selection unit that selects the adjustment bit string.
　次に動作を説明する。 Next, the operation will be described.
　図２は、プロジェクタ装置１００の動作を説明するためのフローチャートである。なお、映像信号は、デジタル演算部１および選択部２に入力される。 FIG. 2 is a flowchart for explaining the operation of the projector device 100. The video signal is input to the digital calculation unit 1 and the selection unit 2.
　ステップＳ１０１では、デジタル演算部１は、入力された映像信号内の階調信号の下位から数えてｎビット目の値を確認して、そのｎビット目の値が１か否かを判断する。デジタル演算部１は、ｎビット目の値が１の場合、第二のビット列の最上位ビットが１であると判断し、ｎビット目の値が０の場合、第二のビット列の最上位ビットが０であると判断する。 In step S101, the digital operation unit 1 checks the value of the nth bit from the lower order of the gradation signal in the input video signal, and determines whether the value of the nth bit is 1. When the value of the nth bit is 1, the digital arithmetic unit 1 determines that the most significant bit of the second bit string is 1, and when the value of the nth bit is 0, the most significant bit of the second bit string Is determined to be 0.
　デジタル演算部１は、第二のビット列の最上位ビットが１であると、ステップＳ１０２を実行し、第二のビット列の最上位ビットが０であると、ステップＳ１０４を実行する。 The digital operation unit 1 executes step S102 if the most significant bit of the second bit string is 1, and executes step S104 if the most significant bit of the second bit string is 0.
　ステップＳ１０２では、デジタル演算部１は、階調信号内の上位ｍ－ｎビットの信号である第一のビット列の全てのビットが１であるか否かを判断する。デジタル演算部１は、全てのビットが１ではないと、ステップＳ１０３を実行し、全てのビットが１であると、ステップＳ１０４を実行する。 In step S102, the digital operation unit 1 determines whether or not all the bits of the first bit string, which is the upper mn bit signal in the gradation signal, are 1. If all the bits are not 1, the digital operation unit 1 executes step S103, and if all the bits are 1, executes step S104.
　ステップＳ１０３では、デジタル演算部１は、第一のビット列に１を加算して調整ビット列として生成し、その調整ビット列を選択部２に入力する。選択部２は、調整ビット列が入力されると、ステップＳ１０５を実行する。 In step S103, the digital operation unit 1 adds 1 to the first bit string to generate an adjustment bit string, and inputs the adjustment bit string to the selection unit 2. When the adjustment bit string is input, the selection unit 2 executes Step S105.
　一方、ステップＳ１０４では、デジタル演算部１は、階調信号内の第一のビット列を調整ビット列として生成する。デジタル演算部１は、階調信号の代わりに調整ビット列を含む映像信号を調整映像信号として選択部２に入力する。選択部２は、映像信号が入力されると、ステップＳ１０５を実行する。 On the other hand, in step S104, the digital operation unit 1 generates the first bit string in the gradation signal as the adjustment bit string. The digital calculation unit 1 inputs a video signal including an adjustment bit string instead of the gradation signal to the selection unit 2 as an adjustment video signal. When the video signal is input, the selection unit 2 executes Step S105.
　ステップＳ１０５では、選択部２は、入力された映像信号内の階調信号から第二のビット列を削除して、階調信号の代わりに第一のビット列を含む映像信号を生成する。選択部２は、その生成された映像信号と調整映像信号のうちいずれかの信号を表示用映像信号として選択する。表示用映像信号に含まれる第一のビット列または調整ビット列が表示用階調信号となる。 In step S105, the selection unit 2 deletes the second bit string from the gradation signal in the input video signal, and generates a video signal including the first bit string instead of the gradation signal. The selection unit 2 selects one of the generated video signal and the adjusted video signal as a display video signal. The first bit string or the adjustment bit string included in the display video signal becomes the display gradation signal.
　選択部２は、その選択した表示用映像信号を投射部３に入力する。投射部３は、表示用映像信号が入力されると、ステップＳ１０６を実行する。 The selection unit 2 inputs the selected display video signal to the projection unit 3. When the display video signal is input, the projection unit 3 executes Step S106.
　ステップＳ１０６では、投射部３は、表示用映像信号に基づいて、その入力された表示用映像信号に含まれる表示用階調信号に応じた階調の画像を投射して、動作を終了する。 In step S106, the projection unit 3 projects an image having a gradation corresponding to the display gradation signal included in the input display video signal based on the display video signal, and ends the operation.
　なお、プロジェクタ装置１０１の動作は、図２で説明した動作において、デジタル演算部１、選択部２および投射部３のそれぞれを、デジタル演算部１１、選択部１２および投射部１３と交換すればよい。 The operation of the projector apparatus 101 may be performed by replacing the digital calculation unit 1, the selection unit 2, and the projection unit 3 with the digital calculation unit 11, the selection unit 12, and the projection unit 13 in the operation described with reference to FIG. .
　次に表示画像の階調についてより詳細に説明する。 Next, the gradation of the display image will be described in more detail.
　ここでは、ｍを４とし、かつ、ｎを１として説明する。つまり、デジタル演算部１が、４ビットの階調信号の最下位ビット（ＬＳＢ：least　significant　bit）に応じて、階調信号内の第一のビット列の値を調整する。 Here, it is assumed that m is 4 and n is 1. That is, the digital operation unit 1 adjusts the value of the first bit string in the gradation signal according to the least significant bit (LSB) of the 4-bit gradation signal.
　また、プロジェクタ装置１００の選択部２は、第一のビット列を表示用階調信号として選択するものとする。この場合、第一のビット列がｍ－ｎビットの信号であり、ｍ＝４およびｎ＝１なので、表示用階調信号は３ビットの信号になる。 Further, it is assumed that the selection unit 2 of the projector device 100 selects the first bit string as a display gradation signal. In this case, since the first bit string is an mn bit signal and m = 4 and n = 1, the display gradation signal is a 3-bit signal.
　図３Ａは、表示用階調信号の信号レベルと、プロジェクタ装置１００による投射画像の輝度レベルとの関係を模式的に示した説明図である。図３Ａでは、横軸は、信号レベルを示し、縦軸は輝度レベルを示す。また、横軸および縦軸のそれぞれの外側の目盛は、表示用階調信号が４ビットの信号であるときに表現できる値を示す目盛であり、その内側の目盛は、表示用階調信号が３ビットの信号であるときに表現できる値を示す目盛である。 FIG. 3A is an explanatory diagram schematically showing the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 100. FIG. In FIG. 3A, the horizontal axis indicates the signal level, and the vertical axis indicates the luminance level. Further, the scales on the outer side of the horizontal axis and the vertical axis are scales indicating values that can be expressed when the display gradation signal is a 4-bit signal, and the scales on the inner side thereof are the scales for display. It is a scale showing values that can be expressed when it is a 3-bit signal.
　図３Ａで示されたように、プロジェクタ装置１００による投射画像は、３ビットの表示用階調信号に応じた画像なので、２３＝８段階の階調を表現することができる。また、仮に表示用階調信号として映像信号内の階調信号がそのまま用いられた場合、投射画像は、４ビットの信号に応じた画像になるので、Ｓ＝２４＝１６段階の階調を表現することができる。 As shown in FIG. 3A, since the projection image by the projector device 100 is an image corresponding to a 3-bit display gradation signal, 2 3 = 8 levels of gradation can be expressed. Further, if the gradation signal in the video signal is used as it is as the display gradation signal, the projected image becomes an image corresponding to the 4-bit signal, so that S = 2 4 = 16 gradation levels. Can be expressed.
　つまり、プロジェクタ装置１００による投射画像で表現できる階調は、表示用階調信号として階調信号がそのまま用いられた場合の半分となる。 In other words, the gradation that can be expressed in the projection image by the projector device 100 is half that when the gradation signal is used as it is as the display gradation signal.
　また、プロジェクタ装置１０１の選択部１２が、プロジェクタ装置１００の選択部２と同様に第一のビット列を選択したと仮定すると、表示用階調信号の信号レベルと、プロジェクタ装置１０１による投射画像の輝度レベルとの関係は、図３Ｂで示された関係となり、図３Ａで示された関係と同じになる。 Assuming that the selection unit 12 of the projector apparatus 101 selects the first bit string in the same manner as the selection unit 2 of the projector apparatus 100, the signal level of the display gradation signal and the brightness of the projection image by the projector apparatus 101 are assumed. The relationship with the level is the relationship shown in FIG. 3B, which is the same as the relationship shown in FIG. 3A.
　このため、選択部１２が第一のビット列を表示用階調信号として選択した場合、その表示用階調信号の信号レベルと、表示画像の輝度レベルとの関係は、図３Ｃで示された関係となる。 Therefore, when the selection unit 12 selects the first bit string as the display gradation signal, the relationship between the signal level of the display gradation signal and the luminance level of the display image is the relationship shown in FIG. 3C. It becomes.
　つまり、表示画像の輝度は、各プロジェクタ装置が投射する投射画像の２倍になるが、表示画像の階調は、各プロジェクタ装置が投射する投射画像の階調と同じ８段階となる。したがって、表示画像の輝度は向上するが、表示画像の階調数は変化しない。 That is, the brightness of the display image is twice that of the projection image projected by each projector apparatus, but the gradation of the display image has the same eight levels as the gradation of the projection image projected by each projector apparatus. Therefore, the brightness of the display image is improved, but the number of gradations of the display image does not change.
　一方、選択部１２が調整ビット列を表示用階調信号として選択した場合、その表示用階調信号の信号レベルと、プロジェクタ装置１０１による投射画像の輝度レベルとの関係は、図４Ａで示した関係となる。 On the other hand, when the selection unit 12 selects the adjustment bit string as the display gradation signal, the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 101 is the relationship shown in FIG. 4A. It becomes.
　図４Ａで示されたように、プロジェクタ装置１０１による投射画像の輝度レベルは、プロジェクタ装置１００による投射画像の輝度レベルと同じ８段階の階調を有している。しかしながら、プロジェクタ装置１０１による投射画像の輝度レベルが変化する信号レベルは、プロジェクタ装置１００による投射画像の輝度レベルが変化する信号レベルと異なっている。 As shown in FIG. 4A, the brightness level of the projected image by the projector apparatus 101 has the same eight levels of gradation as the brightness level of the projected image by the projector apparatus 100. However, the signal level at which the brightness level of the projection image by the projector device 101 changes is different from the signal level at which the brightness level of the projection image by the projector device 100 changes.
　このため、選択部１２が調整ビット列を選択した場合、表示用階調信号の信号レベルと、画像表示システムの表示画像の輝度レベルとの関係は、図４Ｂで示した関係となる。 For this reason, when the selection unit 12 selects the adjustment bit string, the relationship between the signal level of the display gradation signal and the luminance level of the display image of the image display system is the relationship shown in FIG. 4B.
　図４Ｂで示されたように、選択部１２が調整ビット列を選択した場合、画像表示システムの表示画像の階調数は１５となり、階調信号に応じた階調数である１６に近づく。 As shown in FIG. 4B, when the selection unit 12 selects the adjustment bit string, the number of gradations of the display image of the image display system is 15, which approaches 16, which is the number of gradations corresponding to the gradation signal.
　なお、図３Ｂ、図３Ｃ、図４Ａおよび図４Ｂでは、横軸は、信号レベルを示し、縦軸は輝度レベルを示す。また、横軸および縦軸のそれぞれの外側の目盛は、表示用階調信号が４ビットの信号であるときに表現できる値を示す目盛であり、その内側の目盛は、表示用階調信号が３ビットの信号であるときに表現できる値を示す目盛である。 In FIGS. 3B, 3C, 4A, and 4B, the horizontal axis indicates the signal level, and the vertical axis indicates the luminance level. Further, the scales on the outer side of the horizontal axis and the vertical axis are scales indicating values that can be expressed when the display gradation signal is a 4-bit signal, and the scales on the inner side thereof are the scales for display. It is a scale showing values that can be expressed when it is a 3-bit signal.
　次に効果を説明する。 Next, the effect will be explained.
　本実施形態によれば、デジタル演算部１は、映像信号内の複数ビットからなる階調信号のうち、予め定められた数の上位ビットである第一のビット列の値を、階調信号から第一のビット列を除いた第二のビット列の値に応じて調整した調整ビット列を生成する。選択部２は、第一のビット列と調整ビット列とのうちのいずれかの信号を投射用階調信号として選択する。投射部３は、投射用階調信号に基づいて、その投射用階調信号に応じた階調の画像を投射する。 According to the present embodiment, the digital operation unit 1 calculates the value of the first bit string, which is a predetermined number of higher-order bits, from the gradation signal, among the gradation signals composed of a plurality of bits in the video signal. An adjusted bit string adjusted according to the value of the second bit string excluding the one bit string is generated. The selection unit 2 selects one of the first bit string and the adjustment bit string as a projection gradation signal. Based on the projection gradation signal, the projection unit 3 projects an image having a gradation corresponding to the projection gradation signal.
　この場合、階調信号内の第一のビット列と、その第一のビット列の値が調整された調整ビット列とうちのいずれかが投射用階調信号として選択され、その選択された投射用階調信号に応じた階調の画像が投射される。 In this case, one of the first bit string in the gradation signal and the adjustment bit string in which the value of the first bit string is adjusted is selected as the projection gradation signal, and the selected projection gradation is selected. An image having a gradation corresponding to the signal is projected.
　このため、スタック方式を用いた画像表示システムに使用される他のプロジェクタ装置が別のビット列を選択すれば、互いに異なる階調の複数の画像が投射されるので、表示画像の階調数が１台のプロジェクタ装置が投射する投射画像の階調数より増える。したがって、階調信号内の上位ビットに応じた階調の画像が投射される場合でも、表示画像の階調数を本来の階調信号に応じた階調数に近づけることが可能になる。 For this reason, if another projector apparatus used in the image display system using the stack method selects another bit string, a plurality of images having different gradations are projected, and therefore the number of gradations of the display image is 1. More than the number of gradations of the projected image projected by one projector apparatus. Therefore, even when an image having a gradation corresponding to the upper bits in the gradation signal is projected, the number of gradations of the display image can be brought close to the number of gradations corresponding to the original gradation signal.
　また、本実施形態では、デジタル演算部１は、第二のビット列の最上位ビットが１の場合、第一のビット列に１を加算して調整ビット列を生成する。 Further, in the present embodiment, when the most significant bit of the second bit string is 1, the digital operation unit 1 adds 1 to the first bit string to generate an adjusted bit string.
　この場合、画像が投射される際に失われる情報である、階調信号内の第二のビット列を、適切に調整ビット列に反映させることが可能になり、適切な階調を表示画像に表現させることが可能になる。 In this case, the second bit string in the gradation signal, which is information lost when the image is projected, can be appropriately reflected in the adjustment bit string, and an appropriate gradation can be expressed in the display image. It becomes possible.
　また、本実施形態では、デジタル演算部１は、第一のビット列の全てのビットが１でなく、かつ、第二のビット列の最上位ビットが１の場合、第一のビット列に１を加算して調整ビット列を生成する。 In the present embodiment, the digital arithmetic unit 1 adds 1 to the first bit string when all the bits of the first bit string are not 1 and the most significant bit of the second bit string is 1. To generate the adjustment bit string.
　この場合、第一のビット列のオーバーフローを抑制することが可能になる。 In this case, overflow of the first bit string can be suppressed.
　また、本実施形態では、画像表示システムは、第一のビット列を選択する選択部２を有するプロジェクタ装置１００と、調整ビット列を選択する選択部１２を有するプロジェクタ装置１０１とを有する。 In this embodiment, the image display system includes the projector device 100 having the selection unit 2 that selects the first bit string, and the projector device 101 that has the selection unit 12 that selects the adjustment bit string.
　この場合、互いに異なる階調の複数の画像が投射されるので、表示画像の階調数が１台のプロジェクタ装置が投射する投射画像の階調数より増える。したがって、階調信号内の上位ビットに応じた階調の画像が投射される場合でも、表示画像の階調数を本来の階調信号に応じた階調数に近づけることが可能になる。 In this case, since a plurality of images having different gradations are projected, the number of gradations of the display image is larger than the number of gradations of the projection image projected by one projector device. Therefore, even when an image having a gradation corresponding to the upper bits in the gradation signal is projected, the number of gradations of the display image can be brought close to the number of gradations corresponding to the original gradation signal.
　次に第二の実施形態について説明する。 Next, a second embodiment will be described.
　本実施形態では、図１で示した画像表示システムのより詳細な構成について説明する。 In this embodiment, a more detailed configuration of the image display system shown in FIG. 1 will be described.
　図５は、本実施形態の画像表示システムを示したブロック図である。図５において、画像表示システムは、図１で示した構成と同様に、プロジェクタ装置１００および１０１を有する。 FIG. 5 is a block diagram showing the image display system of the present embodiment. In FIG. 5, the image display system includes projector apparatuses 100 and 101, similarly to the configuration shown in FIG.
　プロジェクタ装置１００は、デジタル演算部１と、選択部２と、投射部３と、デジタル入力部４とを有する。また、投射部３は、デジタル信号処理部５と、パネル駆動部６と、パネル部７とを有する。 The projector device 100 includes a digital calculation unit 1, a selection unit 2, a projection unit 3, and a digital input unit 4. The projection unit 3 includes a digital signal processing unit 5, a panel drive unit 6, and a panel unit 7.
　デジタル入力部４は、外部からデジタル信号の映像信号が入力される。デジタル入力部４は、その入力された映像信号をデジタル演算部１および選択部２に入力する。 The digital input unit 4 receives a digital video signal from the outside. The digital input unit 4 inputs the input video signal to the digital calculation unit 1 and the selection unit 2.
　デジタル信号処理部５は、選択部２で選択された表示用映像信号に対してデジタル信号処理を行う。デジタル信号処理は、表示用映像信号内の表示用階調信号に応じた階調を、パネル部７の特性に応じて補正する階調処理などである。なお、デジタル信号処理として、映像信号が示す画像の拡大および縮小を行うスケーリング処理や、投射画像の歪みを補正する歪み補正処理などが行われてもよい。なお、デジタル信号処理は、これらの処理に限らず適宜変更可能である。 The digital signal processing unit 5 performs digital signal processing on the display video signal selected by the selection unit 2. The digital signal processing is gradation processing for correcting the gradation corresponding to the display gradation signal in the display video signal according to the characteristics of the panel unit 7. Note that as the digital signal processing, scaling processing for enlarging and reducing an image indicated by the video signal, distortion correction processing for correcting distortion of the projected image, and the like may be performed. The digital signal processing is not limited to these processes, and can be changed as appropriate.
　パネル駆動部６は、デジタル信号処理部５でデジタル信号処理が行われた表示用映像信号に応じてパネル部７を駆動させるための駆動信号を生成し、その駆動信号をパネル部７に入力する。 The panel drive unit 6 generates a drive signal for driving the panel unit 7 in accordance with the display video signal subjected to the digital signal processing by the digital signal processing unit 5, and inputs the drive signal to the panel unit 7. .
　パネル部７は、例えば、液晶パネルやＤＭＤ（Digital　Micromirror　Device）パネルなどであり、図示していない光源からの光をパネル駆動部６から入力された駆動信号に応じて反射または透過して、表示用階調信号に応じた階調の画像を投射する。 The panel unit 7 is, for example, a liquid crystal panel or a DMD (Digital Micromirror Device) panel, and reflects or transmits light from a light source (not shown) according to a driving signal input from the panel driving unit 6 for display. An image having a gradation corresponding to the gradation signal for use is projected.
　また、プロジェクタ装置１０１は、デジタル演算部１１と、選択部１２と、投射部１３と、デジタル入力部１４とを有する。また、投射部１３は、デジタル信号処理部１５と、パネル駆動部１６と、パネル部１７とを有する。 The projector device 101 also includes a digital calculation unit 11, a selection unit 12, a projection unit 13, and a digital input unit 14. The projection unit 13 includes a digital signal processing unit 15, a panel driving unit 16, and a panel unit 17.
　デジタル入力部１４、デジタル信号処理部１５、パネル駆動部１６およびパネル部１７のそれぞれは、デジタル入力部４、デジタル信号処理部５、パネル駆動部６およびパネル部７のそれぞれと同じ機能を有する。 Each of the digital input unit 14, the digital signal processing unit 15, the panel driving unit 16, and the panel unit 17 has the same functions as the digital input unit 4, the digital signal processing unit 5, the panel driving unit 6 and the panel unit 7, respectively.
　次に動作を説明する。 Next, the operation will be described.
　図６は、本実施形態のプロジェクタ装置１００の動作を説明するためのフローチャートである。 FIG. 6 is a flowchart for explaining the operation of the projector device 100 according to the present embodiment.
　ステップＳ２０１では、デジタル入力部４は、デジタル信号の映像信号が入力されると、その映像信号をデジタル演算部１および選択部２に入力する。デジタル演算部１は、映像信号が入力されると、ステップＳ２０２を実行する。なお、デジタル入力部４は、映像信号内の階調信号から第一のビット列を抽出し、選択部２には、階調信号の代わりに第一のビット列を含む映像信号を入力してもよい。以下、デジタル入力部４は、選択部２には、階調信号の代わりに第一のビット列を含む映像信号を入力したものとする。 In step S201, when a digital video signal is input, the digital input unit 4 inputs the video signal to the digital calculation unit 1 and the selection unit 2. When the video signal is input, the digital calculation unit 1 executes Step S202. Note that the digital input unit 4 may extract the first bit string from the gradation signal in the video signal, and the selection unit 2 may receive the video signal including the first bit string instead of the gradation signal. . Hereinafter, it is assumed that the digital input unit 4 has input the video signal including the first bit string to the selection unit 2 instead of the gradation signal.
　ステップＳ２０２では、デジタル演算部１は、映像信号内の階調信号のうち、予め定められたビット数の第一のビット列の値を、階調信号からその第一のビット列を除いた第二のビット列に応じて調整して調整ビット列を生成する。デジタル演算部１は、階調信号の代わりに調整ビット列を含む映像信号を調整映像信号として選択部２に入力する。選択部２は、調整映像信号が入力されると、ステップＳ２０３を実行する。 In step S202, the digital arithmetic unit 1 calculates the second bit value obtained by excluding the first bit string from the gradation signal, from the gradation signal in the video signal. An adjusted bit string is generated by adjusting according to the bit string. The digital calculation unit 1 inputs a video signal including an adjustment bit string instead of the gradation signal to the selection unit 2 as an adjustment video signal. When the adjustment video signal is input, the selection unit 2 executes Step S203.
　なお、ステップＳ２０２の具体的な処理は、図２のステップＳ１０１～Ｓ１０４で説明した処理と同じである。 Note that the specific processing in step S202 is the same as the processing described in steps S101 to S104 in FIG.
　ステップＳ２０３では、選択部２は、映像信号と調整映像信号とのうちのいずれかを表示用映像信号として選択し、その選択した表示用映像信号をデジタル信号処理部５に入力する。デジタル信号処理部５は、表示用映像信号が入力されると、ステップＳ２０４を実行する。 In step S203, the selection unit 2 selects either the video signal or the adjusted video signal as a display video signal, and inputs the selected display video signal to the digital signal processing unit 5. When the display video signal is input, the digital signal processing unit 5 executes Step S204.
　ステップＳ２０４では、デジタル信号処理部５は、表示用映像信号に対してデジタル信号処理を行い、そのデジタル信号処理を行った表示用映像信号をパネル駆動部６に入力する。パネル駆動部６は、表示用映像信号が入力されると、ステップＳ２０５を実行する。 In step S204, the digital signal processing unit 5 performs digital signal processing on the display video signal, and inputs the display video signal subjected to the digital signal processing to the panel driving unit 6. When the display video signal is input, the panel driving unit 6 executes Step S205.
　ステップＳ２０５では、パネル駆動部６は、表示用映像信号に応じてパネル部７を駆動させるための駆動信号を生成し、その駆動信号をパネル部７に入力する。パネル部７は、駆動信号が入力されると、その駆動信号に応じて光源からの光を反射または透過して、表示用映像信号内の表示用階調信号に応じた階調の画像を投射する。 In step S205, the panel drive unit 6 generates a drive signal for driving the panel unit 7 according to the display video signal, and inputs the drive signal to the panel unit 7. When the drive signal is input, the panel unit 7 reflects or transmits light from the light source according to the drive signal, and projects an image having a gradation according to the display gradation signal in the display video signal. To do.
　本実施形態でも、第１の実施形態と同様に、投射画像の階調数の減少を抑制することが可能になる。 Also in the present embodiment, as in the first embodiment, it is possible to suppress a decrease in the number of gradations of the projected image.
　次に第三の実施形態について説明する。 Next, a third embodiment will be described.
　本実施形態の画像表示システムは、図５で示した構成と同じ構成を有する。また、本実施形態では、デジタル演算部１および１１は、以下のように第一のビット列の値を調整する。 The image display system of the present embodiment has the same configuration as that shown in FIG. In the present embodiment, the digital arithmetic units 1 and 11 adjust the value of the first bit string as follows.
　つまり、デジタル演算部１は、第二のビット列の最上位ビットが０の場合、第一のビット列に－１を加算して調整ビット列を生成し、第二のビット列の最上位ビットが１の場合、第一のビット列をそのまま調整ビット列として生成する。 That is, when the most significant bit of the second bit string is 0, the digital operation unit 1 adds −1 to the first bit string to generate an adjustment bit string, and when the most significant bit of the second bit string is 1. The first bit string is generated as an adjusted bit string as it is.
　また、デジタル演算部１は、第一のビット列の全てのビットが０でなく、かつ、第二のビット列の最上位ビットが０の場合、第一のビット列に－１を加算して調整ビット列を生成し、第一のビット列の全てのビットが０の場合、および、第二のビット列の最上位ビットが０の場合、第一のビット列をそのまま調整ビット列として生成してもよい。 In addition, when all the bits of the first bit string are not 0 and the most significant bit of the second bit string is 0, the digital arithmetic unit 1 adds −1 to the first bit string to obtain the adjusted bit string. When all the bits of the first bit string are 0 and when the most significant bit of the second bit string is 0, the first bit string may be generated as it is as the adjustment bit string.
　次に投射画像の階調についてより詳細に説明する。 Next, the gradation of the projected image will be described in more detail.
　ここでは、ｍを４とし、ｎを１として説明する。また、プロジェクタ装置１００の選択部２は、第一のビット列を表示用階調信号として選択するものとする。 Here, it is assumed that m is 4 and n is 1. In addition, it is assumed that the selection unit 2 of the projector device 100 selects the first bit string as a display gradation signal.
　この場合、表示用階調信号の信号レベルと、プロジェクタ装置１００による投射画像の輝度レベルとの関係は、図３Ａで示した関係と同じになる。 In this case, the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 100 is the same as the relationship shown in FIG. 3A.
　また、プロジェクタ装置１０１の選択部１２が調整ビット列を選択した場合、表示用階調信号の信号レベルと、プロジェクタ装置１０１による投射画像の輝度レベルとの関係は、図７Ａで示した関係となる。 Further, when the selection unit 12 of the projector device 101 selects the adjustment bit string, the relationship between the signal level of the display gradation signal and the luminance level of the image projected by the projector device 101 is the relationship shown in FIG. 7A.
　図７Ａで示されたように、プロジェクタ装置１０１による投射画像の輝度レベルは、プロジェクタ装置１００による投射画像と同じ８段階の階調を有している。しかしながら、プロジェクタ装置１０１による投射画像の輝度レベルが変化する信号レベルは、プロジェクタ装置１００による投射画像の輝度レベルが変化する信号レベルと異なっている。 As shown in FIG. 7A, the luminance level of the projected image by the projector apparatus 101 has the same eight-level gradation as that of the projected image by the projector apparatus 100. However, the signal level at which the brightness level of the projection image by the projector device 101 changes is different from the signal level at which the brightness level of the projection image by the projector device 100 changes.
　このため、選択部１２が調整ビット列を選択した場合、表示用階調信号の信号レベルと、画像表示システムが投射する投射画像の輝度レベルとの関係は、図７Ｂのようになる。 Therefore, when the selection unit 12 selects the adjustment bit string, the relationship between the signal level of the display gradation signal and the luminance level of the projected image projected by the image display system is as shown in FIG. 7B.
　図７Ｂで示されたように、選択部１２が調整ビット列を選択した場合、画像表示システムが投射する投射画像の階調数は１５となり、階調信号に応じた階調数である１６に近づく。 As shown in FIG. 7B, when the selection unit 12 selects the adjustment bit string, the number of gradations of the projected image projected by the image display system is 15, which approaches 16 which is the number of gradations corresponding to the gradation signal. .
　なお、図７Ａおよび図７Ｂでは、横軸は、信号レベルを示し、縦軸は輝度レベルを示す。また、横軸および縦軸のそれぞれの外側の目盛は、４ビットの信号で表現できる値を示す目盛であり、その内側の目盛は、３ビットの信号で表現できる値を示す目盛である。 7A and 7B, the horizontal axis indicates the signal level, and the vertical axis indicates the luminance level. The scales on the outer side of the horizontal axis and the vertical axis are scales indicating values that can be expressed by a 4-bit signal, and the scales on the inner side are scales that indicate values that can be expressed by a 3-bit signal.
　次に効果を説明する。 Next, the effect will be explained.
　本実施形態によれば、デジタル演算部１は、第二のビット列の最上位ビットが０の場合、第一のビット列に－１を加算して調整ビット列を生成する。 According to this embodiment, when the most significant bit of the second bit string is 0, the digital arithmetic unit 1 adds −1 to the first bit string to generate an adjusted bit string.
　この場合、画像が投射される際に失われる情報である、階調信号内の第二のビット列を、適切に調整ビット列に反映させることが可能になり、適切な階調を表示画像に表現させることが可能になる。 In this case, the second bit string in the gradation signal, which is information lost when the image is projected, can be appropriately reflected in the adjustment bit string, and an appropriate gradation can be expressed in the display image. It becomes possible.
　また、本実施形態では、デジタル演算部１は、第一のビット列の全てのビットが０でなく、かつ、第二のビット列の最上位ビットが０の場合、第一のビット列に－１を加算して調整ビット列を生成する。 In this embodiment, the digital arithmetic unit 1 adds −1 to the first bit string when all the bits of the first bit string are not 0 and the most significant bit of the second bit string is 0. To generate the adjusted bit string.
　この場合、第一のビット列のアンダーフローを抑制することが可能になる。 In this case, underflow of the first bit string can be suppressed.
　次に第四の実施形態について説明する。 Next, a fourth embodiment will be described.
　図８は、本実施形態の画像表示システムを示したブロック図である。画像表示システムは、プロジェクタ装置１００および１０１を有する。 FIG. 8 is a block diagram showing the image display system of the present embodiment. The image display system includes projector apparatuses 100 and 101.
　プロジェクタ装置１００は、図５で示した構成のデジタル入力部４の代わりに、Ａ／Ｄ変換部８を有する。また、プロジェクタ装置１０１は、図５で示した構成のデジタル入力部４の代わりに、Ａ／Ｄ変換部１８を有する。 The projector device 100 includes an A / D conversion unit 8 instead of the digital input unit 4 having the configuration shown in FIG. Further, the projector device 101 includes an A / D conversion unit 18 instead of the digital input unit 4 having the configuration shown in FIG.
　Ａ／Ｄ変換部８には、アナログ信号である映像信号が入力される。Ａ／Ｄ変換部８は、映像信号が入力されると、その映像信号をデジタル信号に変換して、ｍビットの階調信号を含むデジタル信号の映像信号を生成する。
Ａ／Ｄ変換部８は、そのデジタル信号の映像信号をデジタル演算部１および選択部２に入力する。なお、Ａ／Ｄ変換部８は、選択部２には、階調信号の代わりにその階調信号のうちの第一のビット列を有する映像信号を入力してもよい。 A video signal which is an analog signal is input to the A / D converter 8. When the video signal is input, the A / D conversion unit 8 converts the video signal into a digital signal, and generates a digital signal video signal including an m-bit gradation signal.
The A / D conversion unit 8 inputs the digital video signal to the digital calculation unit 1 and the selection unit 2. Note that the A / D converter 8 may input a video signal having the first bit string of the gradation signal to the selection unit 2 instead of the gradation signal.
　また、Ａ／Ｄ変換部１８は、Ａ／Ｄ変換部８と同等な機能を有する。 The A / D converter 18 has a function equivalent to that of the A / D converter 8.
　次に効果を説明する。 Next, the effect will be explained.
　本実施形態によれば、Ａ／Ｄ変換部８は、アナログ信号の映像信号が入力されると、デジタル信号に変換する。 According to this embodiment, when an analog video signal is input, the A / D converter 8 converts it into a digital signal.
　この場合、プロジェクタ装置１００にアナログ信号の映像信号が入力される場合でも、表示画像の階調数の減少を抑制することが可能になる。 In this case, even when an analog video signal is input to the projector apparatus 100, it is possible to suppress a decrease in the number of gradations of the display image.
　以上説明した各実施形態において、図示した構成は単なる一例であって、本発明はその構成に限定されるものではない。 In each of the embodiments described above, the illustrated configuration is merely an example, and the present invention is not limited to the configuration.

Claims (8)

  1. 　複数台のプロジェクタ装置が同じ画像を同じ場所に重ねて投射する画像表示システムに使用可能なプロジェクタ装置であって、
    　入力映像信号内の複数ビットからなる階調信号のうち、予め定められた数の上位ビットである第一のビット列の値を、前記階調信号から前記第一のビット列を除いた第二のビット列の値に応じて調整した調整ビット列を生成する演算手段と、
    　前記第一のビット列と前記調整ビット列とのうちのいずれかの信号を投射用階調信号として選択する選択手段と、
    　前記投射用階調信号に基づいて、該投射用階調信号に応じた階調の画像を投射する投射手段と、を有するプロジェクタ装置。     A projector apparatus that can be used in an image display system in which a plurality of projector apparatuses project the same image on the same place,
    Of the gradation signal consisting of a plurality of bits in the input video signal, the value of the first bit string, which is a predetermined number of upper bits, is the second bit string obtained by removing the first bit string from the gradation signal. Computing means for generating an adjusted bit string adjusted according to the value of
    Selecting means for selecting any one of the signals of the first bit string and the adjustment bit string as a projection gradation signal;
    And a projection unit configured to project an image having a gradation corresponding to the projection gradation signal based on the projection gradation signal.
  2. 　請求項１に記載のプロジェクタ装置において、
    　前記演算手段は、前記第二のビット列の最上位ビットが１の場合、前記第一のビット列に１を加算した調整ビット列を生成する、プロジェクタ装置。     The projector device according to claim 1,
    When the most significant bit of the second bit string is 1, the calculation unit generates an adjustment bit string obtained by adding 1 to the first bit string.
  3. 　請求項２に記載のプロジェクタ装置において、
    　前記演算手段は、前記第一のビット列の全てのビットが１でなく、かつ、前記最上位ビットが１の場合、前記第一のビット列に１を加算した調整ビット列を生成する、プロジェクタ装置。     The projector device according to claim 2,
    The computing device generates an adjustment bit string obtained by adding 1 to the first bit string when all the bits of the first bit string are not 1 and the most significant bit is 1.
  4. 　請求項１に記載のプロジェクタ装置において、
    　前記演算手段は、前記第二のビット列の最上位ビットが０の場合、前記第一のビット列に－１を加算した調整ビット列を生成する、プロジェクタ装置。     The projector device according to claim 1,
    The computing device generates an adjustment bit string obtained by adding −1 to the first bit string when the most significant bit of the second bit string is 0.
  5. 　請求項４に記載のプロジェクタ装置において、
    　前記演算手段は、前記第一のビット列の全てのビットが０でなく、かつ、前記最上位ビットが１の場合、前記第一のビット列に－１を加算した調整ビット列を生成する、プロジェクタ装置。     The projector device according to claim 4, wherein
    The projector device generates an adjustment bit string obtained by adding -1 to the first bit string when all the bits of the first bit string are not 0 and the most significant bit is 1.
  6. 　請求項１ないし５のいずれか１項に記載のプロジェクタ装置であって、
    　アナログ信号の映像信号が入力されると、該映像信号をデジタル信号に変換して前記入力映像信号を生成するＡ／Ｄ変換手段をさらに有する、プロジェクタ装置。     A projector device according to any one of claims 1 to 5,
    A projector apparatus, further comprising an A / D conversion means for converting the video signal into a digital signal and generating the input video signal when an analog video signal is input.
  7. 　請求項１ないし６のいずれか１項に記載のプロジェクタ装置を複数台備え、各プロジェクタ装置が同じ画像を同じ場所に重ねて投射する画像表示システムであって、
    　前記第一のビット列を選択する選択手段を有するプロジェクタ装置と、前記調整ビット列を選択する選択手段を有するプロジェクタ装置と、を備える画像表示システム。     An image display system comprising a plurality of the projector devices according to any one of claims 1 to 6, wherein each projector device projects the same image on the same place,
    An image display system comprising: a projector device having selection means for selecting the first bit string; and a projector device having selection means for selecting the adjustment bit string.
  8. 　複数台のプロジェクタ装置が同じ画像を同じ場所に重ねて投射する画像表示システムに使用可能なプロジェクタ装置による画像表示方法であって、
    　入力映像信号内の複数ビットからなる階調信号のうち、予め定められた数の上位ビットである第一のビット列の値を、前記階調信号から前記第一のビット列を除いた第二のビット列の値に応じて調整した調整ビット列を生成し、
    　前記第一のビット列と前記調整ビット列とのうちのいずれかの信号を投射用階調信号として選択し、
    　前記投射用階調信号に基づいて、該投射用階調信号に応じた階調の画像を投射する、画像表示方法。     An image display method by a projector apparatus that can be used in an image display system in which a plurality of projector apparatuses project the same image on the same place,
    Of the gradation signal consisting of a plurality of bits in the input video signal, the value of the first bit string, which is a predetermined number of upper bits, is the second bit string obtained by removing the first bit string from the gradation signal. Generate an adjustment bit string adjusted according to the value of
    Select one of the signals of the first bit string and the adjustment bit string as a projection gradation signal,
    An image display method for projecting an image having a gradation corresponding to the projection gradation signal based on the projection gradation signal.
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