JP2010217832A - Display, program and information storage medium - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display which can make more appropriate conversion, when converting the image signals of a format expressing in the luminance and color difference into the image signals of RGB format. <P>SOLUTION: The projector 100, which is a kind of display, is built including a YUVRGB converter 110, which is a first converter to convert the image signals of the luminance and color difference format expressing images in brightness and color difference into image signals of the RGB format capable of expressing negative values, and a regulator 130 for regulating the image signals of the RGB format, according to the regulation information of the RGB format. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device, a program, and an information storage medium.

  In recent years, display devices that support image display in a wide color gamut such as xvYcc (xv. Color) have been provided. For example, Japanese Patent Application Laid-Open No. 2007-286120 describes a display device corresponding to xvYcc. In order to perform display corresponding to xvYcc, the display device needs to perform image processing in an image signal format expressed by luminance and color difference such as YUV.

  However, it is difficult for a user to adjust an image in an image signal format such as YUV. For this reason, when the user adjusts the color or the like of the image, the display device performs adjustment by displaying an adjustment image in RGB format. The display device needs to perform image processing in the RGB format in order to cope with the adjustment in the RGB format. In such a case, generally, the display device converts the YUV format image signal into the RGB format, and further converts the RGB format image signal into the YUV format.

JP 2007-286120 A

  However, for example, when an extremely dark image or an extremely bright image signal in YUV format is input, when the display device converts the image signal to RGB format, the converted image signal value is expressed in RGB. May exceed a minimum value (for example, 0) or a maximum value (for example, 255). The display device clips an image signal within a setting range (for example, 0 to 255) of a general RGB format image signal value.

  Therefore, for example, the actual value when the converted image signal value is −10 is set to 0, and the actual value when the converted image signal value is 265 is set to 255. . When the display device converts the RGB format image signal into the YUV format in such a state, an image different from the color and brightness of the image to be originally displayed is displayed. In order to avoid such a problem, for example, when performing display corresponding to xvYcc, the adjustment of the color of the image by the user is limited by the specification or the like, and the user-friendliness is not preferable.

  An object of the present invention is to provide a display device, a program, and an information storage medium capable of performing more appropriate conversion when converting an image signal expressed in luminance and color difference into an image signal in RGB format. is there.

  In order to solve the above problems, a display device according to the present invention includes a first conversion unit that converts an image signal in luminance color difference format expressed by luminance and color difference into an image signal in RGB format capable of expressing a negative value. And an adjustment unit that adjusts the image signal in the RGB format according to the adjustment information in the RGB format.

  In addition, the program according to the present invention includes a computer, a first conversion unit that converts an image signal in luminance color difference format expressed by luminance and color difference into an image signal in RGB format that can express a negative value, and RGB It is made to function as an adjustment part which adjusts the image signal of the said RGB format according to the format adjustment information.

  An information storage medium according to the present invention is an information storage medium that stores a computer-readable program, and stores the program.

  According to the present invention, a display device or the like converts an image signal expressed in luminance and color difference into an RGB image signal by converting the image signal into an RGB image signal capable of expressing a negative value. Therefore, an appropriate conversion can be performed. Further, according to the present invention, the display device or the like can cause the user to perform image adjustment in the RGB format even when displaying an image in the xvYcc format, for example.

  In the display device, the first conversion unit converts the luminance / color-difference image signal into an RGB-format image signal capable of expressing a value exceeding an image signal value when white is expressed in the RGB format. It may be converted.

  In addition, the display device according to the present invention provides an image signal in RGB format that can express a luminance color difference format image signal expressed by luminance and color difference and a value that exceeds an image signal value when white is expressed in RGB format. And a first conversion unit that converts the image signal in the RGB format according to the adjustment information in the RGB format.

  In addition, the program according to the present invention allows a computer to display an image signal in a luminance / color difference format expressed by luminance and color difference, in an RGB format capable of expressing a value exceeding the image signal value when white is expressed in RGB format. It is characterized by functioning as a first conversion unit for converting to an image signal and an adjustment unit for adjusting the image signal in the RGB format according to the adjustment information in the RGB format.

  An information storage medium according to the present invention is an information storage medium that stores a computer-readable program, and stores the program.

  According to the present invention, the display device or the like converts the value exceeding the image signal value when white is expressed in RGB format into an RGB format image signal that can be expressed, thereby expressing the luminance expressed by luminance and color difference. More appropriate conversion can be performed when the color difference image signal is converted to an RGB image signal. Further, according to the present invention, the display device or the like can cause the user to perform image adjustment in the RGB format even when displaying an image in the xvYcc format, for example.

  Further, the image processing apparatus may include a second conversion unit that converts the RGB image signal adjusted by the adjustment unit into the luminance color difference image signal.

  According to this, for example, the display device or the like can make adjustments in RGB format by the user, and can display an image corresponding to the xvYcc format.

  In addition, a display unit that displays an image based on the luminance / chrominance format image signal converted by the second conversion unit may be included.

  According to this, for example, the display device can allow the user to make adjustments in the RGB format, and can display an image corresponding to the xvYcc format.

It is a schematic diagram which shows conversion of the YUV value of the conventional dark image. It is a schematic diagram which shows conversion of the YUV value of the conventional bright image. It is a schematic diagram which shows conversion of the YUV value of the dark image in a 1st Example. It is a schematic diagram which shows conversion of the YUV value of the bright image in a 1st Example. It is a functional block diagram of the projector in a 1st Example. It is a flowchart which shows the conversion procedure of the image signal in a 1st Example. It is a figure which shows an example of the adjustment image in a 1st Example.

  Embodiments in which the present invention is applied to a projector will be described below with reference to the drawings. In addition, the Example shown below does not limit the content of the invention described in the claim at all. In addition, all the configurations shown in the following embodiments are not necessarily essential as means for solving the invention described in the claims.

(First embodiment)
FIG. 1 is a schematic diagram showing conventional conversion of YUV values of dark images. FIG. 2 is a schematic diagram showing conversion of the YUV value of a conventional bright image. For example, a dark image in which a Y value as a luminance value is 1, a U value indicating a color difference between a blue image signal value and a luminance value is 10, and a V value indicating a color difference between a red image signal value and a luminance value is 10. When the image signal is input, the YUV value is converted by using the YUVRGB conversion matrix to obtain the RGB value (15.02, −9.583273, 18.72).

  However, since the 8-bit RGB value can only be expressed by 0 to 255 in practice, the G value of −9.583273 is actually 0. As a result, the RGB values are converted using the RGBYUV conversion matrix to become YUV values (6.62506, 6.825587, 5.987832). That is, the actually displayed image becomes brighter than the image represented by the original YUV value, and the hue becomes lighter.

  For example, when an image signal of a bright image having a Y value of 250, a U value of 10, and a V value of 10 is input, the YUV value is converted using a YUVRGB conversion matrix. It becomes an RGB value (264.02, 239.4173, 267.72).

  However, since the 8-bit RGB value can only be expressed by 0 to 255 in practice, the R value 264.02 is actually 255 and the B value 267.72 is actually 255. turn into. As a result, the RGB values are converted using the RGBYUV conversion matrix to become YUV values (2455.8529, 5.161998, 6.524294). That is, the actually displayed image becomes darker than the image represented by the original YUV value, and the hue becomes lighter.

  FIG. 3 is a schematic diagram illustrating conversion of a YUV value of a dark image in the first embodiment. FIG. 4 is a schematic diagram showing the conversion of the YUV value of a bright image in the first embodiment. The projector of this embodiment can express a negative value when performing YUVRGB conversion, and can express a value exceeding the image signal value (255) when white is expressed in RGB format. To the image signal. As a result, the projector can accurately display the image represented by the original YUV value as shown in FIGS.

  Next, functional blocks of the projector 100 having such functions will be described. FIG. 5 is a functional block diagram of the projector 100 according to the first embodiment. A projector 100, which is a type of display device, includes a YUVRGB conversion unit 110 that functions as a first conversion unit that converts a YUV value that is an image signal in luminance color difference format into an RGB value that is an image signal in RGB format, and a user instruction RGBYUV functioning as an instruction information input unit 120 that inputs instruction information indicating the content, an adjustment unit 130 that adjusts the RGB value according to the instruction information, and a second conversion unit that converts the adjusted RGB value into a YUV value It includes a conversion unit 140, an adjustment image generation unit 150 that generates an adjustment image according to instruction information, and a projection unit 190 that functions as a display unit that displays an image.

  Note that the projector 100 may implement the functions of these units using the following hardware. For example, the projector 100 includes a YUVRGB conversion unit 110, the RGBYUV conversion unit 140 includes a multiplication circuit and an addition circuit, the instruction information input unit 120 includes a button, a remote controller (remote controller), a reception circuit, the adjustment unit 130 includes a CPU, and the adjustment image. The generation unit 150 may be mounted using an image processing circuit, a non-volatile memory that stores image data for generating an adjustment image, and the projection unit 190 may be mounted using a lamp, a liquid crystal panel, a liquid crystal driving circuit, a lens, or the like.

  Further, the projector 100 may read and execute a program stored in the information storage medium 200 such as the YUVRGB conversion unit 110. As such an information storage medium 200, for example, a CD-ROM, DVD-ROM, ROM, RAM, HDD, or the like can be applied.

  Next, an image signal conversion procedure using these units will be described. FIG. 6 is a flowchart showing the conversion procedure of the image signal in the first embodiment. The user gives an instruction to display the adjustment image using the remote controller, the instruction information input unit 120 inputs instruction information indicating the instruction content, the adjustment image generation unit 150 generates an adjustment image based on the instruction information, The projection unit 190 projects the adjusted image (step S1).

  FIG. 7 is a diagram illustrating an example of the adjustment image 310 in the first embodiment. The adjustment image 310 is, for example, an OSD (On Screen Display) image displayed so as to overlap the original image in the image 300. The user selects an adjustment target item using the up and down keys and the enter key of the remote controller, and adjusts the adjustment value for each RGB using the left and right keys and numeric keys of the remote controller. After the adjustment is completed, the user presses the RGB key on the remote controller to end the adjustment.

  The instruction information input unit 120 inputs adjustment instruction information indicating the adjustment contents in the adjustment image 310 determined by the remote control operation from the remote control (step S2).

  When a YUV format image signal of an actually displayed image is input, the YUVRGB conversion unit 110 converts the YUV value represented by the image signal into an RGB value using a YUVRGB conversion matrix (step S3). .

  Note that the number of bits that can be processed in the multiplier of the YUVRGB conversion unit 110 is increased as compared with the conventional one, and arithmetic processing can be performed in complement representation. Therefore, a value exceeding 255 or a negative value can be left as it is. Can be output. For example, the conventional YUVRGB conversion unit can output only 0 to 255, but the YUVRGB conversion unit 110 can output −512 to 511, for example.

  The adjustment unit 130 adjusts the RGB value based on the adjustment instruction information input in step S2 (step S4). The RGBYUV conversion unit 140 converts the RGB values into YUV values using an RGBYUV conversion matrix (step S5).

  Note that the number of bits that can be processed by the multipliers of the adjustment unit 130 and the RGBYUV conversion unit 140 is increased as compared with the conventional ones, and arithmetic processing can be performed in a complement expression. It can be output as it is.

  The projection unit 190 generates an image on the liquid crystal panel based on the YUV value and projects the image (step S6). Actually, the processes in steps S3 to S5 are executed for all pixels.

  As described above, according to the present embodiment, the projector 100 converts the YUV value into an RGB value that can represent a negative value and can also represent a value exceeding 255. More appropriate conversion can be performed when converting an image signal in a format expressed by color difference into an image signal in RGB format.

  Further, according to the present embodiment, the projector 100 can cause the user to perform image adjustment in the RGB format even when displaying an image in the xvYcc format, for example. Thereby, the projector 100 can improve the usability of the user.

  Further, according to the present embodiment, the projector 100 can allow the user to make adjustments in the RGB format, and can also display an image corresponding to the xvYcc format.

(Other examples)
In addition, application of this invention is not limited to the Example mentioned above, A various deformation | transformation is possible. For example, the adjustment image described above is not limited to an image for adjusting RGB, and may be an image for adjusting CMY, an image for adjusting RGBCMY, or the like. The YUV signal may be, for example, a YPbPr signal, a YCbCr signal, or the like.

  The YUVRGB conversion matrix and the RGBYUV conversion matrix are not limited to the examples shown in FIGS. 1 to 4, and various matrices can be applied according to the image signal to be processed. Further, the YUVRGB conversion unit 110, the adjustment unit 130, and the RGBYUV conversion unit 140 may process the image signal in a format that can express a negative value of 0-255, or express a value of 0-255, 256 or more. The image signal may be processed in a possible format. That is, the YUVRGB conversion unit 110 and the like do not have to process the image signal in a format that can express both a negative value and a value of 256 or more.

  The RGBYUV conversion unit 140 is not essential, and when the display device displays an image using the RGB values converted from the YUV values as they are, the display device may not include the RGBYUV conversion unit 140.

  The display device to which the present invention is applicable is not limited to the projector 100, and may be a liquid crystal monitor, a television, or the like, for example. The projector 100 is not limited to a liquid crystal projector (transmission type, reflection type such as LCOS), and may be a projector using a DMD (Digital Micromirror Device), for example. DMD is a trademark of Texas Instruments Incorporated. Further, the functions of the projector 100 may be distributed and implemented in a plurality of devices (for example, a PC and a projector).

  DESCRIPTION OF SYMBOLS 100 Projector (display apparatus), 110 YUVRGB conversion part (1st conversion part), 120 Instruction information input part, 130 Adjustment part, 140 RGBYUV conversion part (2nd conversion part), 150 Adjustment image generation part, 190 Projection part (Display unit), 200 information storage medium, 300 images, 310 adjusted images

Claims (8)

A first conversion unit that converts an image signal in luminance color difference format expressed by luminance and color difference into an image signal in RGB format capable of expressing a negative value;
An adjustment unit for adjusting the image signal in the RGB format according to the adjustment information in the RGB format;
Display device. The display device according to claim 1,
The first conversion unit converts the luminance color difference format image signal into an RGB format image signal capable of expressing a value exceeding an image signal value when white is expressed in the RGB format.
Display device. A first conversion unit that converts an image signal in luminance color difference format expressed by luminance and color difference into an image signal in RGB format capable of expressing a value exceeding an image signal value when white is expressed in RGB format;
An adjustment unit for adjusting the image signal in the RGB format according to the adjustment information in the RGB format;
Display device. The display device according to any one of claims 1 to 3,
A display device including a second conversion unit that converts the RGB image signal adjusted by the adjustment unit into the luminance color difference image signal. The display device according to claim 4,
A display device comprising: a display unit configured to display an image based on the luminance / chrominance format image signal converted by the second conversion unit. Computer
A first conversion unit that converts an image signal in luminance color difference format expressed by luminance and color difference into an image signal in RGB format capable of expressing a negative value;
A program that functions as an adjustment unit that adjusts an image signal in the RGB format according to adjustment information in the RGB format. Computer
A first conversion unit that converts an image signal in luminance color difference format expressed by luminance and color difference into an image signal in RGB format capable of expressing a value exceeding an image signal value when white is expressed in RGB format;
A program that functions as an adjustment unit that adjusts an image signal in the RGB format according to adjustment information in the RGB format. An information storage medium storing a computer-readable program,
An information storage medium storing the program according to claim 6.