JP2017182074A - Display device, imaging device, and projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce change of appearance of color of a displayed image to a user in association with change in brightness of a backlight source.SOLUTION: A display device includes: image creation means 101 and 801 for creating an image corresponding to image data; illumination means 102 and 802 for radiating illumination light to the image creation means 101 and 801; brightness changing means 9 and 11 for changing the brightness of the illumination light; color changing means 4 for subjecting the image data to color conversion on the basis of color characteristics of the image creation means 101 and 801 and the brightness of the illumination light; and color correction means 4 for correcting color of the image data subjected to color conversion so that appearance of the image corresponding to the image data subjected to color conversion becomes close to appearance of an image in reference visual environment.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a display device, an imaging device, and a projector.

  2. Description of the Related Art Conventionally, there has been known a display device that changes the luminance of a backlight light source in accordance with the ambient luminance and performs color correction so as to cancel the color changed with the luminance change of the backlight light source (for example, Patent Documents). 1).

JP 2001-117071 A

  However, since the luminance of the backlight light source is changing, there is a problem that the color appearance of the displayed image or the like by the user changes.

  A display device according to a first aspect of the present invention includes an image generation unit that generates an image corresponding to image data, an illumination unit that irradiates the image generation unit with illumination light, and a luminance change that changes the luminance of the illumination light. Means, color conversion means for performing color conversion on the image data based on the color characteristics of the image generation means and the luminance of the illumination light, and the appearance of the image corresponding to the color-converted image data And color correction means for correcting the color of the color-converted image data so as to approach the appearance of the image in the viewing environment.

  According to the present invention, it is possible to correct image data so that the appearance of an image changed by changing the luminance of illumination light approaches the appearance of an image in a reference viewing environment.

Rear view of a digital camera according to an embodiment Block diagram of a digital camera according to an embodiment A diagram for explaining the relationship between ambient brightness and backlight brightness The figure explaining the relationship between the luminance change of illumination light, and the color change of illumination light Diagram showing tone curve used for color correction processing Flowchart for explaining operation of digital camera according to embodiment

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 is a view showing the back side of the digital camera. The viewfinder 21 provided on the upper surface of the digital camera is provided with an EVF 10. On the other hand, the display LCD 8 is provided on the back of the camera. By operating the monitor button 120 in the shooting mode for shooting, either the EVF 10 or the display LCD 8 can be selected as a monitor for displaying a through image. A menu screen is displayed on the display LCD 8 and the EVF 10.

FIG. 2 is a block diagram showing an embodiment of a digital camera according to the present invention. The digital camera includes an imaging optical system 1, an imaging element 2, a control circuit 4, a DRAM 6, a flash memory 7,
A display LCD 8, an LCD drive circuit 9, an EVF (electronic viewfinder) 10, an EVF drive circuit 11, an operation unit 12, a memory card slot 13, and an operation switch group 16 are provided. An LCD (Liquid Crystal Display) is used for the EVF 10. A memory card 14 that is a nonvolatile storage medium is detachably mounted in the memory card slot 13.

  The subject light that has passed through the photographing optical system 1 forms an image on the image sensor 2. An area sensor such as a CCD sensor or a CMOS sensor is used as the image sensor 2, and a photoelectric conversion signal (imaging signal) corresponding to the brightness of the subject image is output to the control circuit 4. Note that R (red), G (green), and B (blue) color filters are provided on the imaging surface of the imaging device 2 so as to correspond to the pixel positions, respectively. Since the image sensor 2 captures a subject image through a color filter, each image signal output from the image sensor 2 has RGB color system color information.

  The control circuit 4 includes a microprocessor and its peripheral circuits, and performs various arithmetic processes such as control of the entire camera. The control circuit 4 converts the input image pickup signal into a digital signal, and performs white balance (WB) processing, interpolation processing, gradation correction processing, color correction processing, format conversion, compression processing, and the like to generate image data. In addition, the control circuit 4 performs a focus adjustment process, a calculation process such as ambient brightness (brightness) of the digital camera, using the generated image data. When a release button (not shown) provided on the operation unit 12 is fully pressed, a photographing process is executed, and the image data generated by the control circuit 4 is recorded on the memory card 14 installed in the memory card slot 13. The

  The operation unit 12 is provided with operation members such as a monitor button 120, a release button (not shown), a menu button, and a power button. The operation switch group 16 is provided with a plurality of switches that are turned on and off in conjunction with operation of an operation member provided in the operation unit 12. The control circuit 4 detects the state of the switch provided in the operation switch group 16 and performs various controls based on the detection result. The DRAM 6 is a volatile recording medium used as a buffer memory for temporarily storing data during and after processing such as image processing and image compression processing.

  The EVF 10 is a finder device that sequentially displays images captured by the image sensor 2 as through images. The EVF 10 is driven and controlled by a drive signal output from the EVF drive circuit 11. On the other hand, the display LCD 8 provided on the back surface of the camera body corresponds to the display of a captured image or a through image (live view) corresponding to the imaging signal output from the imaging device 2 and the image data recorded in the memory card 13. This is used for displaying a reproduced image of the image data to be displayed and various setting screens. The display LCD 8 is driven and controlled by the LCD drive circuit 9.

  When shooting, the user sets the composition with reference to the live view displayed on the EVF 10 or the display LCD 8. At that time, an information image according to the user's preference can be displayed superimposed on the captured image. Information images include information on aperture conditions, shutter speed, continuous shooting or single shooting settings, information on shooting conditions such as scene mode, and auxiliary information to assist shooting of grid patterns and portrait mode person frames, etc. Etc. are included.

The EVF 10 includes a liquid crystal panel 101 and a light source 102. The liquid crystal panel 101 is, for example, a transmissive liquid crystal panel, and includes a plurality of pixels on which red, green, and blue filters are formed. The liquid crystal panel 101 is applied with a voltage by the EVF drive circuit 11 in accordance with a drive signal from the control circuit 4, and generates an image corresponding to image data (input image data) input through the EVF drive circuit 11. At this time, the control circuit 4 performs matrix conversion using a color conversion matrix, which will be described later, on the color information of the original image data expressed in the sRGB color system, and generates input image data. Adapt to a color gamut based on color characteristics. As a result, the liquid crystal panel 101 realizes a function as a display element by irradiation light emitted from the light source 102 that functions as a backlight, and displays an image (through image) corresponding to the imaging signal output from the imaging element 2. Displayed so as to be observable with the EVF 10.

  As the value of the voltage applied to the liquid crystal panel 101, a value (default voltage) corresponding to a reference voltage applied to the light source 102 described later is set based on the characteristics of the material of the liquid crystal panel 101 and the like. The light source 102 is configured by, for example, an LED or the like, and irradiates the illumination light in such a manner that the luminance of the irradiation light can be changed according to the voltage value applied from the EVF drive circuit 11. That is, the EVF drive circuit 11 controls the luminance of the illumination light of the light source 102 according to the ambient brightness of the digital camera based on an instruction from the control circuit 4 as described later.

  The display LCD 8 includes a liquid crystal panel 801 and a light source 802. The liquid crystal panel 801 is, for example, a transmissive liquid crystal panel, and includes a plurality of pixels on which red, green, and blue filters are formed. A voltage is applied to the liquid crystal panel 801 by the LCD drive circuit 9 in accordance with a drive signal from the control circuit 4, and an image corresponding to image data (input image data) input via the LCD drive circuit 9 is generated. At this time, the control circuit 4 performs matrix conversion on the color information of the original image data to generate input image data, and adapts it to the color gamut based on the color characteristics of the liquid crystal panel 801. As a result, the liquid crystal panel 801 realizes a function as a display element by irradiation light emitted from a light source 802 that functions as a backlight, and an image corresponding to an imaging signal output from the imaging element 2 (a captured image, a through image). Image) or a reproduced image corresponding to the image data recorded on the memory card 13 is displayed on the display LCD 8 so as to be observable.

  The value of the voltage applied to the liquid crystal panel 801 is set corresponding to a reference voltage applied to the light source 802 described later. The light source 802 is configured by an LED or the like, for example, and irradiates the illumination light in such a manner that the luminance of the irradiation light can be changed according to the value of the voltage applied from the LCD drive circuit 9. That is, the LCD drive circuit 9 controls the luminance of the illumination light of the light source 802 according to the brightness around the digital camera based on an instruction from the control circuit 4 as will be described later.

（式１） Next, a color conversion matrix and matrix conversion will be described using the EVF 10. The pixel values of the input image data input to the liquid crystal panel 101 are (R, G, B), and the colorimetric values reproduced by the liquid crystal panel 101 are (X, Y, Z). The relationship between the pixel value (R, G, B) of the input image data at this time and the colorimetric value (X, Y, Z) of the liquid crystal panel 101 is expressed by the following equation (1). Here, γ represents a gradation characteristic of the liquid crystal panel 101, and M is a color conversion matrix representing conversion from pixel values (R ^γ , G ^γ , B ^γ ) of the input image data to colorimetric values to the liquid crystal panel 101. It is. (X _k , Y _k , Z _k ) represents the illumination condition of the display surface including ambient illumination when a black image is displayed.

(Formula 1)

（式２）
なお、Ｍについては、複数のＲ，Ｇ，Ｂの組合せに対し、実際に液晶パネル１０１に表示された色を測定したときのＸ，Ｙ，Ｚの値を用いて、式（１）で変換したＸ，Ｙ，Ｚと実測のＸ，Ｙ，Ｚの色差（CIEL^＊ａ^＊ｂ^＊のような均等色空間における色差）が最小となるように最適化したマトリックスを用いてもよい。 Then, an R image ((R, G, B) = (1, 0, 0)), a G image ((R, G, B) = (0, 1, 0)) and a B image ((R, G, B) B) = (0, 0, 1)) is determined from the image displayed on the liquid crystal panel 101, and the 3 × 3 matrix coefficient of the color conversion matrix M is determined. Specifically, the colorimetric values of the liquid crystal panel 101 when the R image, G image, and B image are displayed are (X _r , Y _r , Z _r ), (X _g , Y _g , Z _g ) and _Assuming (X _b , Y _b , Z _b ), the color conversion matrix is as shown in the following equation (2). The color conversion matrix M is set for a reference luminance described later, that is, a value of a reference voltage applied to the light source 102, and is recorded in a predetermined recording area.

(Formula 2)
M is converted by Equation (1) using the values of X, Y, and Z when the colors actually displayed on the liquid crystal panel 101 are measured for a plurality of combinations of R, G, and B. Alternatively, a matrix optimized so that the color difference between the measured X, Y, Z and the actually measured X, Y, Z (color difference in a uniform color space such as CIEL ^* a ^* b ^* ) may be used.

（式３） Using the color conversion matrix M, the control circuit 4 performs matrix conversion on the original image data to perform color conversion, and generates input image data. If the color space of the original image is sRGB, the colorimetric values (X, Y, Z) on the liquid crystal panel 101 with respect to the pixel values (R ₀ , G ₀ , B ₀ ) of the original image data are as follows: (3) M _{sRGB → XYZ} is a conversion matrix from sRGB to XYZ defined by the standard.

(Formula 3)

（式４） Therefore, the pixel values (R, G, B) of the input image data to the liquid crystal panel 101 are calculated as in the following Expression 4 using Expressions (1) and (3).

(Formula 4)

  Hereinafter, a case where the monitor button 120 is operated and the EVF 10 is selected as a monitor for displaying a through image will be described. The control circuit 4 determines the display luminance (backlight luminance) of the EVF 10, that is, the value of the voltage applied to the light source 102 according to the ambient luminance calculated based on the image data as described above. As shown in the relationship diagram between the ambient brightness and the backlight brightness in FIG. 3, the control circuit 4 drives the EVF drive circuit 11 in accordance with the increase in ambient brightness, that is, the backlight brightness increases as the surroundings become brighter. Output a signal. As a result, a large current is passed through the light source 102 as the ambient brightness increases. Note that the backlight luminance corresponding to the ambient luminance indicated by the broken line in FIG. 3 is the reference luminance, that is, the optimum luminance when the user observes the EVF 10 in a room under fluorescent lamp illumination, for example. Further, the data and the value of the applied voltage shown in FIG. 3 are recorded in advance in the flash memory 7 in the form of a lookup table or the like.

The illumination light from the light source 102 may exhibit a characteristic that the color changes according to the luminance. FIG. 4 shows an example of how the color of the illumination light changes according to the luminance. FIG. 4A shows an example of how the saturation and hue change, excluding the change in the luminance direction using the CIEL ^* a ^* b ^* color system. In FIG. 4A, the saturation and hue of the illumination light change in the direction of arrows B0 → B1 → B2 → B3 →... To do. That is, as the luminance of the illumination light increases, the illumination light gradually becomes bluish.

FIG. 4B shows the relationship between the increase in luminance and the color change (color difference ΔC) of the illumination light when the color of the illumination light at the reference luminance is used as a reference. As shown in FIG. 4B, the amount of change in the color difference ΔC increases as the luminance of the illumination light increases. Note that the color difference ΔC is represented by (ΔC = (a ² + b ² ) ^1/2 ) using the CIEL ^* a ^* b ^* color system of FIG. The control circuit 4 performs color conversion on the original image data to generate input image data so as to cancel the color difference ΔC of the illumination light that has changed with the increase in the brightness of the illumination light. That is, the control circuit 4 performs correction processing on the color conversion matrix M. The control circuit 4 performs correction processing on the color conversion matrix M by, for example, multiplying the color conversion matrix M by a coefficient set in advance according to the value of the voltage applied to the light source 102. This coefficient is calculated in advance through experiments, tests, and the like, and is recorded in a predetermined recording area in association with the value of the voltage applied to the light source 102.

  When the luminance of the illumination light from the light source 102 is determined, the control circuit 4 changes the color gamut of the liquid crystal panel 101, that is, the value of the voltage applied to the liquid crystal panel 101. The value of the default voltage applied to the liquid crystal panel 101 is set corresponding to the value of the reference voltage applied to the light source 102 as described above. That is, the image generated on the liquid crystal panel 101 is set to reproduce the color indicated by the color information of the image data in accordance with the luminance of the illumination light when the reference voltage is applied to the light source 102. Therefore, when the applied voltage to the light source 102 is changed, the voltage value applied to the liquid crystal panel 101 is changed from the default voltage value, thereby changing the color characteristics of the liquid crystal panel 101 in accordance with the change in luminance of the illumination light. Let Therefore, the control circuit 4 performs color conversion on the original image data so as to cancel the change in the color characteristics of the liquid crystal panel 101 and generates input image data. That is, the control circuit 4 performs correction processing on the color conversion matrix M as described above.

  By generating the input image data using the color conversion matrix M after correction, a color close to the original color information of the image data for the image generated on the liquid crystal panel 101 according to the luminance change of the light source 102 Is reproduced with EVF10. However, the appearance of the color of the image by the user's eyes changes due to the luminance change of the light source 102. For example, when the brightness of the illumination light that illuminates a flower image increases, the color of the flower on the image appears to the user's eyes more vividly than the original color, or the appearance changes as if the gradation is tight To do. Therefore, the control circuit 4 performs color correction processing on the image data so as to cancel such a change in the appearance of the color. In the present embodiment, as the color correction processing, for example, gradation, saturation, and white point of image data are corrected.

-Tone correction-
When the gradation of the image data is corrected, the control circuit 4 switches and selects a tone curve for γ conversion of the image data in accordance with the luminance of the light source 102. Three types of tone curves C1 to C3 as shown in FIG. 5 are previously recorded in a predetermined recording area. When the luminance of the light source 102 is high, that is, when a high current is passed through the light source 102, the control circuit 4 selects a gradual tone curve C1 having a curved shape. When the curve is low, the tone curve C3 having a steep curve shape is selected. When the luminance of the light source 102 is near the reference luminance, that is, when a voltage having a value close to the reference voltage is applied to the light source 102, the control circuit 4 selects the tone curve C2. Then, the control circuit 4 converts the pixel value of the image data so that the selected tone curve is obtained. As a result, the appearance of the image gradation changed according to the luminance change of the light source 102 is corrected, and the image is displayed on the EVF 10 with an appearance close to the original gradation of the image. When the shooting subject is displayed on the EVF 10 in the live view, the tone curve C1 is selected when the brightness of the image displayed on the EVF 10 is higher than the actual brightness of the subject, and the brightness of both is approximately the same. In this case, the tone curve C2 is selected, and the tone curve C3 is selected when the brightness of the image displayed by the EVF 10 is low.

-Saturation correction-
The control circuit 4 corrects the saturation of the image data stepwise according to the luminance of the light source 102 between the bright saturation and the low saturation. When the luminance of the light source 102 is high, that is, when a large current is supplied to the light source 102, the control circuit 4 converts Cr, Cb converted from R, G, B of the image data to YCrCb so that the saturation is low. to correct. When the luminance of the light source 102 is low, that is, when the voltage applied to the light source 102 is low, the control circuit 4 corrects Cr and Cb so that the saturation is bright. When the luminance of the light source 102 is near the reference luminance, that is, when a voltage having a value close to the reference voltage is applied to the light source 102, the control circuit 4 does not correct the saturation. As a result, the appearance of the saturation of the image changed according to the luminance change of the light source 102 is corrected, and the image is displayed on the EVF 10 with an appearance close to the original saturation of the image. In addition, when a shooting subject is displayed on the EVF 10 in live view, the saturation is decreased when the display luminance of the EVF 10 is low, so that the saturation is lowered when the display luminance of the EVF 10 is higher than the actual luminance of the subject. What is necessary is just to correct | amend Cr and Cb so that it may raise.

-White point correction-
The control circuit 4 determines the R gain of the image data and the R gain for the B color image signal in accordance with the light source determined based on the color information of the R, G, and B colors of the image signal output from the image sensor 2. B gain is calculated. Then, the control circuit 4 performs image processing on the image data based on the calculated R gain and B gain, and corrects the white area on the image so as not to be completely white. As a result, for example, when an image obtained by photographing a white house in the evening is displayed on the EVF 10, the color of the house on the image is completely white by the color conversion process using the color conversion matrix corrected according to the luminance change of the light source 102. And the color of the house on the image can be corrected to be reddish due to the influence of the sunset.

  The control circuit 4 causes the EVF 10 to display an image corresponding to the image data that has been subjected to the color adjustment processing as described above. As a result, the actual visual environment, that is, the color appearance when the image on the EVF 10 is observed at the time of image capturing is almost the same as the color appearance of the image in the reference visual environment (for example, indoors under fluorescent light illumination). It is corrected to be equal.

  Even when the monitor button 120 is operated and the display LCD 8 is selected as a monitor for displaying a through image, the control circuit 4 performs the same processing as that described in the EVF 10. As a result, the display brightness (backlight brightness) of the display LCD 8 and the image displayed on the display LCD 8 are corrected based on the ambient brightness. Further, color correction processing is performed on the image displayed on the display LCD 8 so that the actual viewing environment, that is, how the color appears when the image on the display LCD 8 is observed during image capture or playback display. The color is corrected so as to be almost equal to the color appearance of the image in the reference visual environment.

  The operation of the digital camera described above will be described using the flowchart shown in FIG. A program for executing each process of the flowchart of FIG. 6 is recorded in a memory (not shown), activated when the monitor button 120 of the operation unit 12 is operated and an operation signal is input from the operation switch group 16, and executed by the control circuit 4. The The flowchart in FIG. 6 shows processing when the EVF 10 is selected as a monitor for displaying a through image. However, when the display LCD 8 is selected, the control circuit 4 is similar to the display LCD 8. Shall be processed.

In step S1, the value of the current passed through the light source 102 is determined based on the calculated ambient brightness. Then, the value of the current passed through the light source 102 via the EVF drive circuit 11 is changed, and the process proceeds to step S2. In step S2, the color difference ΔC of the illumination light changed according to the luminance change of the illumination light from the light source 102 is calculated, and the process proceeds to step S3.

  In step S3, the color conversion matrix is corrected according to the color difference ΔC of the illumination light. Then, the original image data is color-converted using the corrected color conversion matrix to generate input image data. That is, the original image data is subjected to color conversion based on the luminance of the illumination light from the light source 102 and the characteristics of the liquid crystal panel 101. In the next step S4, color correction processing is performed on the image data in accordance with the luminance of the illumination light from the light source 102, and the processing ends. As a result, the color-converted input is performed based on the luminance of the illumination light from the light source 102 so that the appearance of the image corresponding to the color-converted input image data approaches the appearance of the image in the reference viewing environment. The color of the image data is corrected.

According to the digital camera of the embodiment described above, the following operational effects can be obtained.
(1) The control circuit 4 corrects the color conversion matrix for performing matrix conversion on the original image data based on the color characteristics of the liquid crystal panels 101 and 801 and the changed backlight luminance, and the color conversion after the correction Input image data is generated by color-converting original image data using a matrix. Then, the control circuit 4 applies color to the input image data based on the luminance of the light sources 102 and 802 so that the appearance of the image corresponding to the input image data approaches the appearance of the image in the reference viewing environment. A correction process was performed to correct the color of the displayed image. Therefore, since the color conversion matrix is corrected in accordance with the luminance change of the light sources 102 and 802, the color change of the illumination light that changes with the luminance change of the light sources 102 and 802 is corrected, and the color close to the original color information of the image. Can be reproduced on the liquid crystal panels 101 and 801. Further, the appearance of the color of the image generated on the liquid crystal panels 101 and 801 is corrected according to the luminance change of the light sources 102 and 802, and is close to the appearance of the image in the standard viewing environment or the actual subject. Since the image is displayed, it is possible to prevent the color of the image from being too vivid or to make the gradation appear to be too tight, and to reduce the uncomfortable feeling given to the user.

(2) The control circuit 4 calculates the ambient brightness of the digital camera using the image data acquired by the image sensor 2, and calculates the backlight brightness, that is, the current flowing to the light sources 102 and 802 according to the calculated ambient brightness. I decided to decide. Therefore, the backlight luminance can be changed according to the ambient luminance, that is, the backlight luminance can be lowered when the surrounding is dark, and the backlight luminance can be increased when the surrounding is bright. It is possible to prevent a decrease in image visibility.

The digital camera of the embodiment described above can be modified as follows.
(1) Instead of using the image data acquired by the image sensor 2 to calculate the ambient brightness, the ambient brightness may be obtained by an operation for setting a shooting condition by the user. In this case, for example, the user operates the operation unit 12 to select an environment closest to the environment in which the digital camera is used from the ambient brightness menu (for example, “daytime”, “evening”, “night”, “sunny”, “cloudy”). Etc.) may be selected as the photographing condition. Then, the control circuit 4 may flow a current recorded in advance in association with the ambient luminance menu to the light sources 102 and 802 so that the backlight luminance suitable for the selected photographing condition is obtained.

(2) The backlight luminance may be changed to a desired luminance by a user operation. In this case, the operation unit 12 includes a variable volume or the like, and the user operates the variable volume to correct the backlight brightness to a desired level according to the ambient brightness. Then, the control circuit 4 may read the current to be supplied to the light sources 102 and 802 changed by the variable volume, and correct the color conversion matrix according to the changed current value.

(3) The digital camera is not limited to the one provided with both the EVF 10 and the display LCD 8, and may be provided with one of the EVF 10 and the display LCD 8.

(4) The present invention can also be applied to portable electronic devices such as a mobile phone and a PDA equipped with a display device having a liquid crystal monitor. In this case, a backlight luminance corresponding to the ambient luminance may be determined by providing a sensor for calculating the ambient luminance and an operation unit that receives an operation by the user.

(5) The present invention can also be applied to a projector having a liquid crystal panel and a light source that illuminates the liquid crystal panel. In this case, a backlight luminance corresponding to the ambient luminance may be determined by providing a sensor for calculating the ambient luminance and an operation unit that receives an operation by the user. Alternatively, an imaging device for capturing the projection surface of the projection image by the projector may be provided, and the ambient luminance may be calculated using image data acquired by the imaging device.

  In addition, the present invention is not limited to the above-described embodiment as long as the characteristics of the present invention are not impaired, and other forms conceivable within the scope of the technical idea of the present invention are also within the scope of the present invention. included. The embodiments and modifications used in the description may be configured by appropriately combining them.

4 control circuit, 8 display LCD, 9 LCD drive circuit,
10 EVF, 11 EVF drive circuit, 12 operation unit,
101,801 liquid crystal panel, 102,802 light source

Claims (12)

Image generating means for generating an image corresponding to the image data;
Illuminating means for illuminating the image generating means with illumination light;
Brightness changing means for changing the brightness of the illumination light;
Color conversion means for performing color conversion on the image data based on the color characteristics of the image generation means and the luminance of the illumination light;
Color correction means for correcting the color of the color-converted image data so that the appearance of the image corresponding to the color-converted image data approximates the appearance of the image in the reference viewing environment. A display device. The display device according to claim 1,
A luminance detecting means for detecting ambient luminance;
The display device characterized in that the brightness changing means changes the brightness of the illumination light in accordance with the ambient brightness detected by the brightness detecting means. The display device according to claim 1 or 2,
The display device according to claim 1, wherein the color correction means performs at least gradation correction processing and white point correction processing on the color-converted image data. An image sensor that captures a subject image and outputs an image signal;
An imaging apparatus comprising the display device according to claim 1. The imaging apparatus according to claim 4,
A luminance detecting means for detecting ambient luminance;
The imaging apparatus according to claim 1, wherein the luminance changing unit changes the luminance of the illumination light according to the ambient luminance detected by the luminance detecting unit. The imaging apparatus according to claim 5,
The brightness detecting unit detects the ambient brightness using an image signal output from the image sensor. The imaging apparatus according to claim 5,
An operation member for setting shooting conditions based on the shooting environment;
The brightness detecting means detects the ambient brightness based on the set shooting condition. In the imaging device according to any one of claims 4 to 7,
The image correction apparatus, wherein the color correction unit performs at least a gradation correction process and a white point correction process on the color-converted image data. A display device according to claim 1;
A projector comprising: an optical system that projects the image of the image generation unit irradiated with the illumination light. The projector according to claim 9, wherein
A luminance detecting means for detecting ambient luminance;
The projector according to claim 1, wherein the brightness changing means changes the brightness of the illumination light according to the ambient brightness detected by the brightness detecting means. The projector according to claim 10, wherein
It further includes an imaging means for capturing a projection surface on which the projected image is projected and acquiring projection surface data.
The projector according to claim 1, wherein the brightness detection unit detects the ambient brightness using the projection plane data acquired by the imaging unit. The projector according to any one of claims 9 to 11,
The projector according to claim 1, wherein the color correction unit performs at least a gradation correction process and a white point correction process on the color-converted image data.

Images