JP5505691B2 - Color difference component correction apparatus and projector provided with color difference component correction apparatus - Google Patents

Description

  The present invention relates to a color difference component correction device and a projector including the color difference component correction device.

  2. Description of the Related Art Today, data projectors are widely used as image projection apparatuses that project a screen of a personal computer (hereinafter referred to as a PC), a video image, an image based on image data stored in a memory card or the like onto a screen. This projector focuses light emitted from a light source on a micromirror display element called DMD (digital micromirror device) or a liquid crystal plate, and displays a color image on a screen.

  The image data stored in a memory card or the like often uses the YCbCr4: 2: 2 format in which the amount of data is relatively small and the calculation at the time of correction is simple. The YCbCr4: 2: 2 format is a format in which a color is represented by three signals of a Y signal that is a luminance component, Cb that is a color difference between the luminance component and the blue component, and Cr that is a color difference between the luminance component and the red component. The YCbCr4: 2: 2 format uses the characteristic that the human eye is insensitive to saturation, and reproduces brightness with emphasis on the luminance. For the color, the luminance component and the blue component, and the luminance component and the red color are used. This format uses the color difference from the component.

  In the YCbCr 4: 2: 2 format, Y, Cb, and Cr components are recorded horizontally at a pixel ratio of 4: 2: 2. That is, when numbers 1, 2, 3, 4, 5,... Are assigned to horizontally arranged pixels, the Y signal records information for each pixel 1, 2, 3, 4, 5,. However, for Cb and Cr, one piece of information is recorded in only two of the pixels 1, 3, 5,..., And the color difference information of the pixel 1 is applied to the pixel 2. This is generally called a sub-sample, and the code amount is reduced by reducing the number of pixels of the color difference component. In the YCbCr 4: 2: 2 format, the color difference component of the pixel 1 is applied to the pixels 1 and 2 at the time of reproduction, and the color difference component of the pixel 3 is applied to the pixels 3 and 4 to interpolate the image of the image data. Also, in the YCbCr4: 4: 4 format, which is different from the YCbCr4: 2: 2 format, Y, Cb, and Cr components are recorded independently, so that they are not subsampled, and the chrominance components are pixels as well as the luminance components. Record every time.

  When image data recorded in the YCbCr4: 2: 2 format is reproduced by a projector, for example, when image data in which black characters are written on a yellow background background is reproduced and the image is projected on a screen, the image data is interpolated. As a result, one pixel of the yellow background portion adjacent to the black character uses the black color difference component and becomes black and white whose color is an achromatic color. As a result, the yellow luminance component is gray.

  In particular, in the projector, when the image is enlarged and projected, the luminance of one pixel of the colored portion such as the yellow background portion adjacent to the black character is emphasized, and the color difference becomes clear. Further, in the image mode in the projector function, when the brightness priority mode in which white is emphasized is selected, yellow is relatively dark and the gray portion is regarded as white and emphasized in white. There was a problem that the image formed was projected on the screen and was unsightly.

  Therefore, in Patent Document 1 shown below, a character region is extracted based on a feature amount calculated from an image, and the image is divided into blocks, and a black character color and a background color on the image are detected for each block. An image processing apparatus is disclosed in which gradation correction between a black character color and a background color is performed and a contrast between the black character color and the background color is adjusted.

JP 2004-320701 A

  However, the above-described image processing apparatus in Patent Document 1 has a problem that it is necessary to detect the character color and the background color in the character area in the image data in the entire image area to perform gradation correction, and processing takes time. .

  Therefore, the present invention has been made in view of the above-described problems of the prior art, and the image data in the YCbCr4: 2: 2 format that has a relatively small amount of data and that can be easily calculated at the time of correction. An object of the present invention is to provide a color difference component correction device capable of performing image processing without causing unnecessary edges in characters when displaying an image composed of a background with the same color background, and a projector including the color difference component correction device. .

A color difference component correction apparatus in a projector according to the present invention is a color difference component correction apparatus in a projector that projects an image or the like based on image data input from the outside onto a screen, and converts the image data from RGB format data to YCbCr4: 4: 4. Data format detection conversion means for converting to format data, color difference detection means for detecting color difference components of the YCbCr4: 4: 4 format data converted by the data format detection conversion means, and color difference detection means In addition, in the color difference component of each pixel, the color difference determination means for determining whether or not the color difference components of adjacent pixels for every two pixels match, and all the color difference components of adjacent pixels for every two pixels by the color difference determination means. When determined that they agree with each other, the color by averaging the color difference components of the pixels of the color difference component and the both sides of each pixel Color difference correction means for correcting the component; and correction data format conversion means for converting the image data of the YCbCr4: 4: 4 format data by the color difference component corrected by the color difference correction means into RGB format data again. The color difference correction means is characterized in that when all the color difference components of adjacent pixels for every two pixels match, the color difference components are averaged by a plurality of adjacent pixels to correct the color difference components.

  In the color difference component correction apparatus according to the present invention, the color difference determination means determines whether or not the color difference components of adjacent pixels for every two pixels match, and thereby converts the original image data in the YCbCr4: 4: 4 format. It is determined whether or not the image data is in YCbCr4: 2: 2 format.

  In the color difference component correction apparatus according to the present invention, the correction data format conversion means converts the YCbCr4: 4: 4 format image data corrected by the color difference correction means into RGB format image data that is a predetermined format suitable for display. It is characterized by being converted.

  The projector according to the present invention includes a color difference component correction device and a projector control unit, and the projector control unit controls the color difference component correction device to correct the color difference component of the image data.

  According to the present invention, characters are not necessary when displaying an image composed of a background of the same color as the characters in the image data in the YCbCr4: 2: 2 format, which has a relatively small amount of data and simplifies the calculation at the time of correction. It is possible to provide a color difference component correction apparatus and a projector including the color difference component correction apparatus that can perform image processing without generating a sharp edge.

1 is an external perspective view showing a projector according to the present invention. It is a figure which shows the functional circuit block of the projector which concerns on this invention. It is explanatory drawing which shows the difference of the image before and after color difference component correction | amendment in this invention. It is explanatory drawing which shows the flow of operation | movement of the color difference component correction apparatus by the projector which concerns on this invention. It is explanatory drawing regarding correction | amendment of the color difference components Cb and Cr of each pixel by the CbCr correction process in this invention.

  Hereinafter, modes for carrying out the present invention will be described. The color difference component correction apparatus 70 of the present invention is a color difference component correction apparatus 70 in the projector 10 that projects an image or the like based on image data stored in a memory card 32 or the like, which is input from the outside, onto a screen. The color difference component correction device 70 includes a data format detection conversion unit 71 serving as data format detection conversion means for converting the image data from RGB 8: 8: 8 format data to YCbCr 4: 4: 4 format data. In addition, the color difference component correction apparatus 70 includes a color difference detection unit 72 serving as a color difference detection unit that detects the color difference component of the YCbCr 4: 4: 4 format data converted by the data format detection conversion unit 71. Further, the color difference component correction device 70 is a color difference determination unit that determines whether or not the color difference components of adjacent pixels for every two pixels match among the color difference components of each pixel detected by the color difference detection unit 72. A color difference determination unit 73 is provided.

  Further, the color difference component correction device 70 includes a color difference correction unit 74 that serves as a color difference correction unit that corrects the color difference component when the color difference determination unit 73 determines that the color difference components of adjacent pixels of every two pixels match. . Further, the color difference component correction device 70 is a correction data format conversion means for converting again the image data of the YCbCr 4: 4: 4 format data based on the color difference component corrected by the color difference correction unit 74 into RGB 8: 8: 8 format data. The correction data format conversion unit 75 is provided.

  Then, the color difference correction unit 74 in the color difference component correction device 70 corrects the color difference component by averaging the color difference components with a plurality of adjacent pixels when the color difference components of the adjacent pixels of every two pixels match.

  In addition, the color difference determination unit 73 in the color difference component correction apparatus 70 determines whether or not the color difference components of adjacent pixels for every two pixels match, and the original image data in the converted YCbCr4: 4: 4 format. It is determined whether the image data is in YCbCr 4: 2: 2 format.

  Further, the color difference correction unit 74 in the color difference component correction apparatus 70 averages the three adjacent pixels to correct the color difference component.

  Then, the correction data format conversion unit 75 in the color difference component correction device 70 has a RGB 8: 8: 8 format which is a predetermined format suitable for displaying the image data in the YCbCr 4: 4: 4 format corrected by the color difference correction unit 74. Convert to image data.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an external perspective view of the projector 10. In the present embodiment, left and right indicate the left and right direction with respect to the projection direction, and front and rear indicate the projection direction from the projector 10 and the front and rear direction with respect to the traveling direction of the light bundle. As shown in FIG. 1, the projector 10 has a substantially rectangular parallelepiped shape, and has a lens cover 19 that covers the projection port on the side of the front panel 12 that is a side plate in front of the main body case. Is provided with a plurality of exhaust holes 17. Further, although not shown, an Ir receiver for receiving a control signal from the remote controller is provided.

  In addition, a key / indicator section 37 is provided on the top panel 11 which is a main body case. The key / indicator section 37 includes a power switch key, a power indicator for notifying power on / off, and projection on / off. D-- including projection switch key to switch, RGB image input to project the projected image into an image based on image data stored in a USB memory that is a memory card attached to the USB terminal on the rear panel, or to display a PC screen etc. Keys and indicators such as a screen switching key that can select whether to use an image by the SUB terminal, an overheat indicator that notifies when the light source device, the display element, or the control circuit is overheated are arranged. Note that the screen switching can be set in advance so as to be USB memory priority setting, PC priority setting, or the like.

  Further, on the back of the main body case, various terminals such as an input / output connector section and a power adapter plug provided with a D-SUB terminal, an S terminal, an RCA terminal and the like including a USB terminal and an RGB input for image signal input on the rear panel. 20 are provided. A plurality of intake holes 18 are formed in the vicinity of the lower portion of the right side panel, which is a side plate of the main body case (not shown), and the left side panel 15, which is the side plate shown in FIG.

  Then, by inserting a USB memory storing image data into a USB terminal provided on the rear panel, the projector 10 can project an image or the like based on the image data on the screen. Note that the image data stored in the USB memory, which is a memory card, is subsampled YCbCr4: 2: 2 format data, so that the amount of data is relatively small and the calculation at the time of correction is simplified. Further, analog RGB format image data is input to a D-SUB terminal including an RGB input for image signal input.

  Next, projector control means of the projector 10 will be described with reference to the block diagram of FIG. The projector control means is composed of a control unit 38, an input / output interface 22, an image conversion unit 23, a display encoder 24, a display drive unit 26, a color difference component correction device 70, and the like, and various standards input from the input / output connector unit 21. The image signal is unified into a digitized RGB 8: 8: 8 format 24-bit image signal which is a predetermined format suitable for display by the image conversion unit 23 via the input / output interface 22 and the system bus (SB). The color difference component is corrected by the color difference component correction device 70 as necessary, and is output to the display encoder 24.

  The display encoder 24 develops and stores the input image signal in the video RAM 25, generates a video signal from the stored contents of the video RAM 25, and outputs the video signal to the display driving unit 26.

  The display driving unit 26 drives the display element 51, which is a spatial light modulation element (SOM), at an appropriate frame rate corresponding to the image signal output from the display encoder 24, and is emitted from the light source device 63. A light beam is incident on the display element 51 via the light source side optical system, thereby forming an optical image with the reflected light of the display element 51, and an image is displayed on a screen (not shown) via a projection system lens group serving as a projection side optical system. Is projected and displayed. The movable lens group 97 of the projection side optical system is driven by the lens motor 45 for zoom adjustment and focus adjustment.

  The color difference component correction device 70 includes a data format detection conversion unit 71 as a data format detection conversion unit, a color difference detection unit 72 as a color difference detection unit, a color difference determination unit 73 as a color difference determination unit, and a color difference correction unit. And a correction data format conversion unit 75 serving as correction data format conversion means.

  The data format detection conversion unit 71 determines whether or not the original image data of the image data converted into the RGB 8: 8: 8 format data in the image conversion unit 23 is the subsampled YCbCr 4: 2: 2 format data. In order to make a determination, the RGB format data is converted into YCbCr 4: 4: 4 format image data.

  The color difference detection unit 72 detects the color difference component of the image data in the YCbCr 4: 4: 4 format converted by the data format detection conversion unit 71. The color difference determination unit 73 determines whether or not the color difference components of adjacent pixels every two pixels in the horizontal direction match among the color difference components of each pixel detected by the color difference detection unit 72 over the entire image.

  In the color difference correction unit 74, the color difference determination unit 73 matches the color difference components of every two adjacent pixels in the horizontal direction, and the original image data of the converted YCbCr4: 4: 4 format image data is subsampled. If it is determined that the image data is in the YCbCr 4: 2: 2 format, the color difference component is averaged by a plurality of adjacent pixels to correct the color difference component. As a correction method, there is a moving average of the color difference components of three pixels including adjacent pixels with respect to the color difference components in the horizontal direction.

  The correction data format conversion unit 75 is a digitized RGB 8: 8: 8 format, which is a predetermined format suitable for displaying image data in the YCbCr 4: 4: 4 format composed of the color difference components that are moving averaged by the color difference correction unit 74. To the image signal.

  The control unit 38 controls the operation of each circuit in the projector 10, and is composed of a ROM in which operation programs such as a CPU and various settings are fixedly stored, a RAM used as a work memory, and the like. .

  An operation signal of a key / indicator unit 37 composed of a main key and an indicator provided on the upper panel 11 of the main body case is directly sent to the control unit 38, and a key operation signal from the remote controller is sent to the Ir receiving unit 35. , And the code signal demodulated by the Ir processor 36 is output to the controller 38.

  Note that an audio processing unit 47 is connected to the control unit 38 via a system bus (SB). The sound processing unit 47 includes a sound source circuit such as a PCM sound source, converts the sound data into analog in the projection mode and the playback mode, and drives the speaker 48 to emit loud sounds.

  The control unit 38 controls the light source control circuit 41. The light source control circuit 41 turns on the light source of the light source device 63 when the power switch key is operated. Further, the control unit 38 causes the cooling fan drive control circuit 43 to perform temperature detection using a plurality of temperature sensors provided in the light source device 63 and the like, and controls the rotation speed of the cooling fan based on the temperature detection result. Further, the control unit 38 causes the cooling fan drive control circuit 43 to keep the cooling fan rotating even after the projector body is turned off by a timer or the like, and further turns off the projector body system depending on the result of temperature detection by the temperature sensor. Control is also performed.

  Further, the control unit 38 controls the color difference component correction device 70 to reduce the amount of data stored in the memory card 32 and to make the calculation at the time of correction in a subsampled YCbCr 4: 2: 2 format. By correcting the color difference component of the image data, it is possible to eliminate problems such as whitening that occurs at the edge of the character.

  Here, an outline of correction of the color difference component will be described using an enlarged view of the subsampled image. FIG. 3 shows an enlarged image of a black circle character on a yellow background, FIG. 3 (a) is the original image, and FIG. 3 (b) is a subsampled YCbCr4: 2 FIG. 3C is an example of an image reproduced by performing color difference correction according to the present invention on the subsampled image data.

  As shown in FIG. 3B, a white white light pixel 55 is present on a part of a yellow background background right next to a black circle character. The white light pixel 55 uses the color difference components Cb and Cr of the black character portion adjacent to the left by converting the original image data into image data of the YCbCr 4: 2: 2 format subsampled. The luminance component Y is generated because the luminance component Y of yellow of the original pixel is used.

  In particular, in the case of a device such as the projector 10 that displays image data in an enlarged manner, the white light pixels 55 appear to be raised on the edge of the character, making it difficult to see.

  Therefore, as shown in FIG. 3C, even if the original image data is subsampled YCbCr4: 2: 2 format image data, the white light pixel 55 is corrected by performing the color difference correction of the present invention. As a result, the corrected pixel 56 becomes close to the original image, and the image does not feel strange.

  Next, the color difference correction operation of the present invention will be described with reference to the drawings. FIG. 4 is an explanatory diagram showing a control flow of the color difference correction function.

  The projector 10 includes a D-SUB terminal that receives an analog RGB input for projecting the screen of the PC 200 as a video source, and a USB terminal to which a USB memory for projecting an image of USB memory data stored in the USB memory is mounted. With. When the control unit 38 detects through the input / output interface 22 that a D-SUB cable for connection with the PC 200 is attached to the D-SUB terminal, the control unit 38 executes a video input process (step S100). The control unit 38 controls the image conversion unit 23 as a video input process (step S100) to execute a conversion process of analog RGB input image data input as a video.

  The image conversion unit 23 executes an AD conversion process (step S105) for converting analog RGB input image data into digital RGB 8: 8: 8 format 24-bit image data, and a predetermined format suitable for display. Are converted into the RGB 8: 8: 8 format.

  On the other hand, when the control unit 38 detects through the input / output interface 22 that a USB memory, which is a memory card 32 in which image data in YCbCr format is stored as a video source, is installed via the input / output interface 22, a USB memory mounting process ( Step S200) is executed. The control unit 38 detects the image data stored in the USB memory as the USB memory mounting process (step S200), and further controls the image conversion unit 23 when detecting that the image data is image data in the YCbCr format. Then, a data format conversion process (step S205) for converting the image data in the YCbCr format into the image data in the RGB format is executed, and the image data is converted into the RGB8: 8: 8 format which is a predetermined format suitable for display.

  Then, a video source determination process (step S210) that determines the video source by selecting whether the video source is the screen of the PC 200 or the image stored in the USB memory by the screen switching key of the key / indicator unit 37. ). However, in the video source determination process (step S210), for example, when a video source such as USB memory priority setting or computer priority setting is set in advance, the video source based on the setting is selected.

  When the video source is determined by the video source determination process (step S210), if the screen of the PC 200 is selected, the color difference component correction device 70 determines that the image data is analog RGB input, and corrects the color difference component. Absent. Then, the color difference component correction apparatus 70 performs sub-sample determination when the video source is an image stored in the USB memory.

  The color difference component correction device 70 uses the YCbCr4: 2: 2 format in which predetermined image data suitable for display, which has already been converted into image data in the RGB8: 8: 8 format in the data format conversion process (step S205), is subsampled. YCbCr4: 4: 4 conversion that controls the data format detection conversion unit 71 to convert image data in RGB8: 8: 8 format into image data in YCbCr4: 4: 4 format. The process (step S215) is executed.

  Unlike the YCbCr4: 2: 2 format image data, the YCbCr4: 4: 4 format image data has a color difference component for each pixel in the horizontal direction, so that the original image data is RGB8: 8: In the case of image data in the 8 format or YCbCr4: 4: 4 format, the image data is converted into image data having different color difference components for each pixel. However, if the original image data is subsampled YCbCr4: 2: 2 format image data, the color difference components of adjacent pixels are the same when converted to YCbCr4: 4: 4 format image data.

  Therefore, when the YCbCr4: 4: 4 conversion process (step S215) is completed, the color difference detection unit 72 in the color difference component correction apparatus 70 detects the color difference component of each pixel of the image data in the YCbCr4: 4: 4 format. Then, the color difference determination unit 73 in the color difference component correction apparatus 70 executes a subsample determination process (step S220) for determining whether the image data that has been input as video is subsampled YCbCr4: 2: 2 format image data. To do.

  Then, in the subsample determination process (step S220) by the color difference determination unit 73, if it is determined that the image data input as video is subsampled YCbCr4: 2: 2 format image data, the color difference component correction device 70. The color difference correction unit 74 in FIG. 7 executes CbCr correction processing (step S225) in order to correct the color difference component. As the CbCr correction process (step S225), the color difference correction unit 74 is generated by the YCbCr4: 4: 4 conversion process (step S215) in order to correct the point where the color difference components of the adjacent pixels in the horizontal direction are the same. Further, the color difference component of the image data in the YCbCr4: 4: 4 format is subjected to moving average based on the signals of three adjacent pixels, thereby correcting the color close to the original image.

  When the color difference correction unit 74 completes the CbCr correction process (step S225) and corrects the color difference component, the correction data format conversion unit 75 in the color difference component correction device 70 corrects the color difference component YCbCr4: 4: A projection data generation process (step S230) is executed to convert the four-format image data into RGB8: 8: 8 format image data, which is a predetermined format suitable for display.

  Then, when the data conversion is completed by the correction data format conversion unit 75, the color difference component correction device 70 outputs the converted image data to the display encoder 24, and projects the image on the screen through a series of processes (step S235). ).

  Next, processing for correcting the color difference component of each pixel in the horizontal direction with respect to the CbCr correction processing (step S225) described above will be described in detail with reference to the drawings. FIG. 5 is an explanatory diagram regarding correction of the color difference components Cb and Cr of each pixel by the CbCr correction process.

  As shown in FIG. 5, the upper pixel 1 to pixel 8 are part of the subsampled image data, the color difference component Cb = Cb0 in the pixel 1 and pixel 2, and the color difference component in the pixel 3 and pixel 4. The color difference components of the adjacent pixels in the horizontal direction have the same value so that Cb = Cb2.

  In the CbCr correction process, in order to correct the point where the color difference components of adjacent pixels are the same, the color difference component of the image data generated by the YCbCr 4: 4: 4 conversion process is changed to the color difference component of the adjacent pixels in the horizontal direction. Using the moving average, a white light pixel 55 as shown in FIG. 3 is set as a correction pixel 56 close to the original image.

  For the pixel 2 shown in FIG. 5, the chrominance component Cb becomes a value of (Cb0 + Cb0 + Cb2) / 3 by moving average, and is averaged by the chrominance component Cb2 of the pixel 3 adjacent to the right with respect to the value of Cb0 before correction. be able to.

  As described above, according to the present embodiment, an image composed of a background with a background of the same color as characters is displayed with image data in the YCbCr4: 2: 2 format that has a relatively small amount of data and simplifies calculation at the time of correction. In this case, it is possible to provide the color difference component correction device 70 and the projector 10 including the color difference component correction device 70 that can perform image processing without causing unnecessary edges in characters.

  In addition, according to the present embodiment, the image data stored in the memory card 32 or the like is saved in the YCbCr4: 2: 2 format in which the data amount is relatively small and the calculation at the time of correction is simplified, thereby increasing the memory capacity. Savings and memory bus bandwidth performance can be improved.

  Further, according to the present embodiment, even if YCbCr4: 2: 2 format image data stored in the memory card 32 or the like is converted into the RGB format, the image data converted into the RGB format is converted into YCbCr4: 4: By converting the image data into four formats, it is possible to determine whether the original image data is a subsampled image.

  According to the present embodiment, it is possible to determine whether the image data input by the video is a subsampled image by determining whether or not the color difference components of adjacent pixels for every two pixels match. Therefore, when an image composed of a background with the same color as the character is displayed for an image of any video source, it is possible to perform image processing that does not generate an unnecessary edge in the character.

  Further, according to the present embodiment, when it is determined that the original image data is a subsampled image, the color difference component of the three adjacent pixels is used for moving average to correct the color difference component and return to the RGB signal. Thus, the unnaturalness of the image can be reduced. It is possible to reduce the unnaturalness of the image by correcting the color difference component by increasing the number of pixels, such as adding both adjacent pixels and moving average with a total of 5 pixels. A similar effect can be obtained even if the geometrical averaging is performed.

  Also, according to the present embodiment, any video source input has been converted into YCbCr4: 4: 4 format and sub-sample determination has been performed. However, for example, it is limited to video source input via a USB terminal. Then, sub-sample determination may be executed.

  In addition, this invention is not limited to the above Example, A change and improvement are freely possible in the range which does not deviate from the summary of invention.

10 Projector
11 Top panel 12 Front panel
15 Left panel 17 Exhaust hole
18 Air intake hole 19 Lens cover
20 Various terminals 21 Input / output connector
22 I / O interface 23 Image converter
24 Display encoder 25 Video RAM
26 Display driver
32 Memory card 35 Ir receiver
36 Ir processing section 37 Key / indicator section
38 Control unit 41 Light source control circuit
43 Cooling fan drive control circuit 45 Lens motor
47 Audio processor 48 Speaker
51 Display element 55 White light pixel
56 Correction pixel 63 Light source device
70 Color difference component correction device 71 Data format detection converter
72 Color difference detector 73 Color difference detector
74 Color difference correction unit 75 Correction data format conversion unit
200 pcs

Claims (4)

A color difference component correction apparatus in a projector that projects an image or the like based on image data input from the outside onto a screen,
Data format detection conversion means for converting the image data from RGB format data to YCbCr4: 4: 4 format data;
Color difference detection means for detecting a color difference component of the YCbCr4: 4: 4 format data converted by the data format detection conversion means;
Color difference determination means for determining whether or not the color difference components of adjacent pixels for every two pixels match in the color difference components of each pixel detected by the color difference detection means;
When the color difference determination means determines that the color difference components of adjacent pixels for every two pixels match , the color difference for correcting the color difference component by averaging the color difference components of each pixel and the color difference components of both adjacent pixels Correction means;
Correction data format conversion means for converting the image data of the YCbCr4: 4: 4 format data by the color difference component corrected by the color difference correction means into RGB format data again;
And the color difference correction means corrects the color difference component by averaging the color difference components with a plurality of adjacent pixels when the color difference components of adjacent pixels every two pixels match. Component correction device.   The color difference determination means determines whether or not the color difference components of adjacent pixels for every two pixels match, and the original image data of the converted YCbCr4: 4: 4 format image data is YCbCr4: 2: The color difference component correction apparatus according to claim 1, wherein it is determined whether or not the format is two. The correction data format conversion unit converts the image data in YCbCr 4: 4: 4 format corrected by the color difference correction unit into image data in RGB format, which is a predetermined format suitable for display. The color difference component correction apparatus according to claim 1 or 2 . A color difference component correction device and a projector control means;
The color difference component correction apparatus is the color difference component correction apparatus according to any one of claims 1 to 3 , and the projector control unit controls the color difference component correction apparatus to correct a color difference component of the image data. A projector characterized by causing the projector to function.

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