JP6032964B2 - Image processing apparatus and control method thereof - Google Patents

Description

The present invention relates to an image processing apparatus and a control method thereof.

  There is known a signal processing device that outputs an image signal to a display device including a liquid crystal panel. The image signal output to the display device is composed of a luminance signal (Y) and color difference signals (Cb, Cr). In the display device, the received luminance signal and color difference signal are converted into three color component signals of RGB and displayed (see Patent Document 1). In recent years, a display device that can receive and display an image signal in which the ratio of the number of pixels of the luminance signal and the color difference signal is 4: 2: 2 is also known. For example, a video camera or a digital camera is known as a device including such a display device.

JP 2008-281998 A

  A video camera or the like has a function of rotating and displaying a liquid crystal panel. When the display device is rotated in the horizontal direction, it is necessary to display the image to be displayed in a horizontally reversed manner. At this time, it is necessary to reverse the order of the image signals output to the display device.

  However, when the output order of the luminance signal and the color difference signal is simply reversed, the gravity center of the luminance and the color difference is shifted, and when this is converted into an RGB signal, the color is blurred.

  Accordingly, an object of the present invention is to make it possible to display an image satisfactorily when the image is displayed on the display device while being horizontally reversed.

An invention for solving the above problems is an image processing apparatus,
An input means for inputting an image signal composed of a luminance signal and a color difference signal;
Display means for performing display based on an image signal composed of a luminance signal and a color difference signal;
Detection means for detecting the orientation of the display means;
Control means for outputting an image signal input by the input means to the display means, and controlling an output order of the image signals to the display means in accordance with the direction of the display means detected by the detection means. Control means for
The control means includes
It said detecting means when detecting the first orientation, and output to the luminance signal and the display means in a predetermined order to output order of the color difference signal,
When the detection unit detects a second direction that is opposite to the first direction, the output order is reverse to the predetermined order for each horizontal line of the image signal. In addition, the luminance signal is timed so that the color difference signal corresponding to the predetermined luminance signal is output at a timing corresponding to the output of the predetermined luminance signal corresponding to the color difference signal in the input image signal. Output to the display means in the order preceded by the color difference signal by a predetermined number of pixels in the direction.

  When the image is displayed on the display device with the left and right reversed, the image can be displayed satisfactorily.

1 is a block diagram showing a configuration example of an image processing apparatus corresponding to Embodiment 1 of the invention. The figure which shows an example of the external appearance of the camera 100 corresponding to Embodiment 1 of invention. The figure for demonstrating the color difference conversion of 4: 2: 2 system corresponding to embodiment of invention. The figure for demonstrating the color difference conversion of 4: 1: 1 system corresponding to embodiment of invention. 5 is a flowchart of color difference conversion processing corresponding to Embodiment 1 of the invention. The block diagram which shows the structural example of the image processing apparatus corresponding to Embodiment 2 of invention. FIG. 10 is a diagram showing an example of the appearance of a projector 600 corresponding to Embodiment 2 of the invention. The flowchart of the color difference conversion process corresponding to Embodiment 2 of invention.

[Embodiment 1]
FIG. 1A is a block diagram showing a configuration of a camera 100 as an image processing apparatus of the present invention. The camera 100 records a moving image signal according to a predetermined recording format. The moving image signal and other information recorded on the recording medium are managed as files in accordance with a FAT (File Allocation Table) file system. In the camera 100 of FIG. 1A, each block may be configured by hardware using a dedicated logic circuit or memory except for physical devices such as an image sensor, a lens, and a display element. Alternatively, the processing program stored in the memory may be configured by software by a computer such as a CPU executing the processing program.

  In FIG. 1A, an imaging unit 101 captures a subject, generates moving image data indicating the subject, and outputs the moving image data. The imaging unit 101 includes an optical system such as a zoom lens and a focus lens, an image sensor such as a CCD, an iris, and an AD converter that converts captured moving image data into digital data. The moving image data output from the imaging unit 101 is stored in the memory 102.

  The memory 102 stores moving image data, display image signals, compressed moving image data, and other information. The display control unit 103 displays moving images and various types of information on the display unit 104 in accordance with instructions from the control unit 106. The display unit 104 includes a known display device such as a liquid crystal panel. The display control unit 103 and the display unit 104 will be described later.

  At the time of recording, the signal processing unit 105 encodes the captured moving image data, compresses the information amount, and stores it in the memory 102. At the time of reproduction, the reproduced moving image data is decoded to expand the information amount. The control unit 106 includes a microcomputer and other necessary memory, and controls the operation of each unit of the camera 100 according to a user instruction from the operation unit 107 according to a program stored in a non-illustrated nonvolatile memory. The operation unit 107 includes various switches such as a power switch that can be operated by the user, a trigger switch that instructs to start and stop moving image shooting, a playback switch, and a menu switch. The control unit 106 receives a user instruction from the operation unit 107. In addition, the user operates the menu switch to display a menu screen on the display unit 104, and uses this menu screen to change the operation mode of the camera 100, the compression mode when recording a moving image, and the like, and change the setting. To do.

  The recording / reproducing unit 108 records various types of information such as compressed moving image data on the recording medium 109 according to an instruction from the control unit 106 and reproduces the information from the recording medium 109. The recording medium 109 is a randomly accessible recording medium such as a memory card or a hard disk (HDD). In this embodiment, the recording medium 109 is assumed to be a replaceable memory card with a built-in flash memory. Further, the recording medium 109 is configured so that the user can easily mount and discharge the camera 100 with a mounting and discharging mechanism (not shown). The internal bus 110 is used to transfer various data and commands between the units of the camera 100.

  Next, processing during shooting will be described. When the power of the camera 100 is turned on by the operation unit 107, the control unit 106 controls each unit of the camera 100 and stores the moving image data obtained by the imaging unit 101 in the memory 102. Then, the moving image of the subject corresponding to the moving image data stored in the memory 102 is displayed on the display unit 104, and the recording standby state is set.

  In this state, the control unit 106 determines whether there is an instruction to start recording by the operation unit 107. When there is an instruction to start recording, the control unit 106 controls each unit to start encoding moving images and start recording moving images on the recording medium 109. The imaging unit 101 sequentially outputs captured moving image data in accordance with an instruction from the control unit 106 and sequentially stores the data in the memory 102 via the bus 110.

  The signal processing unit 105 compresses the moving image data stored in the memory 102 and stores the compressed data in the memory 102 again. At this time, the control unit 106 controls the signal processing unit 105 to encode and compress moving image data in accordance with a predetermined compression mode (recording mode). The control unit 106 instructs the recording / reproducing unit 108 to read the moving image data from the memory 102 and record it on the recording medium 109. The recording / playback unit 108 adds necessary data to the compressed moving image data and audio data to generate a data stream. Then, in accordance with a predetermined file system, a moving image file including this data stream is generated and recorded on the recording medium 109.

  When the operation unit 107 instructs to stop recording after the recording is started, the control unit 106 instructs the recording / playback unit 108 to stop recording the moving image. The recording / reproducing unit 108 stops the recording of the moving image on the recording medium 109 according to the recording stop instruction from the control unit 106. Then, the control unit 106 puts the camera 100 into the recording standby state again. In the present embodiment, a series of moving images recorded between a recording start instruction and a recording stop instruction are managed as one file.

  Next, the reproduction process will be described. When the playback unit is instructed by the operation unit 107, the control unit 106 controls the recording / playback unit 108 so as to play back the designated video file among the video files recorded on the recording medium 109. The recording / reproducing unit 108 reproduces the designated moving image file from the recording medium 109, and stores the moving image data stored in the moving image file in the memory 102. The signal processing unit 105 reads out the moving image data from the memory 102, decodes it, and stores it in the memory 102 again. The display control unit 103 reads the decoded moving image data from the memory 102 and displays the reproduced moving image on the display unit 104. When an instruction to stop playback is given, the control unit 106 instructs the recording / playback unit 108 to stop playback of the moving image file.

  Next, the display control unit 103 and the display unit 104 in the present embodiment will be described. FIG. 1B is a diagram illustrating the configuration of the display control unit 103 and the display unit 104. In the present embodiment, the imaging unit 101 outputs moving image data in which one screen has 1920 horizontal pixels × 1080 vertical pixels. The moving image data output by the imaging unit 101 has a ratio of the number of pixels of the luminance signal Y and the plurality of color difference signals Cr and Cb of 4: 2: 2. The recording / reproducing unit 108 records the moving image data of horizontal 1920 pixels × vertical 1080 pixels. The number of pixels of the liquid crystal panel 118 is vertical 854 pixels (dots) × horizontal 480 pixels (dots).

  The moving image data acquired by the imaging unit 101 is input to the screen size conversion unit 111 in FIG. At the time of reproduction, the moving image data decoded by the signal processing unit 105 is input. In both recording and reproduction, the screen size conversion unit 111 receives 1920 × 1080 pixel moving image data including a luminance signal Y and a plurality of color difference signals Cr and Cb. The screen size conversion unit 111 converts the number of pixels of the luminance signal of each frame of the input moving image data into 854 pixels × 480 pixels which is the number of display pixels of the liquid crystal panel. Accordingly, the number of pixels of the color difference signals Cr and Cb is converted to half the number of pixels of the luminance signal Y, respectively. The moving image data in which the number of pixels is converted is output to the multiprocessing unit 112. The multiprocessing unit 112 multiplexes various types of information such as OSD data with the moving image data from the screen size conversion unit 111 and outputs the multiplexed data to the memory 113. The moving image data stored in the memory 113 is output to the color difference processing unit 114. As will be described later, the color difference processing unit 114 changes the output timing of the luminance signal and the color difference signal in accordance with the orientation of the display unit 104 and outputs the result. The transmission unit 115 outputs the luminance signal and the color difference signal from the color difference processing unit 114 to the display unit 104 in the LVDS format.

  In the display unit 104, the reception unit 116 receives the luminance signal and the color difference signal from the display control unit 103 and sends them to the conversion processing unit 117. The conversion processing unit 117 converts the luminance signal and the color difference signal into RGB signals and sends them to the liquid crystal panel 118. The liquid crystal panel 118 displays an image according to the RGB signals. In addition, the direction detection unit 119 detects the orientation of the display unit 104 and outputs the detected direction to the control unit 106. As a direction detection method, a switch or a sensor is provided in the display unit 104, and the direction of the display unit 104 can be detected in accordance with an output from the switch or sensor. Since a known method can be used as the detection method itself, a more detailed description is omitted in this specification.

  Next, correction processing by the color difference processing unit 114 will be described. FIG. 2 is a view showing the appearance of the camera 100. In FIG. 2, 201 is a lens and 202 is a shutter button. In the present embodiment, the side on which the lens 201 is disposed is referred to as the front of the camera 100, and the surface facing the front is referred to as the back. FIG. 2 shows a state where the subjects 200A and 200B are being photographed. In the case of FIG. 2A, the display unit 104 is positioned so as to be incorporated in the back of the main body of the camera 100. In this case, the user of the camera 100 is directed toward the subject from the back side of the camera 100, and can take a picture using the display unit 104 as a viewfinder. The direction in which the display unit 104 faces in this state is referred to as a first direction. That is, the first direction can be defined as a direction from the front of the camera 100 toward the back in relation to the camera 100.

  The display unit 104 is rotatably attached to the main body of the camera 100, and can be horizontally rotated in the left direction when viewed from the back of the apparatus as shown in FIG. In the case of FIG. 2B, the display unit 104 is located away from the back of the main body of the camera 100 so as to face the same direction as the lens 201. In this case, the user of the camera 100 looks into the lens 201 of the camera 100 from the front side of the camera 100, and can similarly take a picture using the display unit 104 as a viewfinder. The direction in which the display unit 104 faces in this state is referred to as a second direction. That is, the second direction is a direction opposite to the first direction, and can be defined as a direction from the back of the camera 100 toward the front in relation to the camera 100.

  When the display unit 104 is thus rotated to the state shown in FIG. 2B, it is necessary to match the viewpoint position of the user viewing the display unit 104 with the arrangement of the subject in the image displayed on the display unit 104. There is. Specifically, in the situation of FIG. 2B, it is necessary to display an image 104B that is opposite to the display image 104A in FIG. For this reason, the luminance signal and the color difference signal are output to the display unit 104 so as to be displayed in the opposite direction.

  FIG. 3 shows a configuration example of an image signal composed of a luminance signal and a color difference signal output to the display unit 104. For example, in SMPTE125, Cb0 and Cr0 have a format that matches Y0, and Cb2 and Cr2 have a format that matches the center of gravity of Y2. In this embodiment, a signal format similar to the above format is assumed. In the case of the 4: 2: 2 system, the ratio of the sampling frequency of the luminance signal and each color difference signal is 4: 2: 2. That is, in the 4: 2: 2 system, each color difference signal has half the number of pixels (number of samples) with respect to the luminance signal. A data array 301 indicates the arrangement order of data when moving image data is output to the display unit 104, and indicates a result of reading in the order according to the format of SMPTE125. 301a shows the correspondence between the pixel positions of the luminance signal and the color difference signal. If this data is simply reversed left and right as indicated by 302a, the chrominance signals Cb0 and Cr0 are associated with the luminance signal Y1 in the horizontal direction, so that the center of gravity of the luminance signal and the color difference signal is shifted. Therefore, when the conversion processing unit 117 of the display unit 104 converts the luminance signal and the color difference signal into RGB signals and displays them on the liquid crystal panel 118, it is recognized as a color blur.

  Therefore, in the present embodiment, the position (timing) of the luminance signal output to the display unit 104 is changed based on the detection result of the direction of the display unit 104 from the direction detection unit 119. That is, when the direction detection unit 119 detects that the orientation of the display unit 104 has reached the position shown in FIG. 2B, the control unit 106 controls the display control unit 103 to store the moving image data stored in the memory 113. Is instructed to be read in reverse. As a result, the luminance signal and the color difference signal are read out with the reading order reversed for each horizontal line. In the present embodiment, since only the horizontal reversal of the image is performed, there is no change in the reading order in the vertical direction. Then, as shown in 303a, the color difference processing unit 114 is instructed to shift and output the luminance signal by one pixel so as to advance in the time direction. By this processing, the luminance signal to be read is preceded by one pixel with respect to the color difference signal, and as a result, the color difference center of gravity is maintained like the color difference signals Cb0 and Cr0 corresponding to the luminance signal Y0. . Here, as a result of the luminance signal preceding the color difference signal by one pixel, the luminance signal is lost at the right end of the screen by the preceding amount. For this, interpolation is performed with the luminance signal existing adjacent to the missing position, that is, Y0. That is, interpolation is performed by outputting adjacent luminance signals as missing pixels.

  In the above example, the case where the invention is applied to the display unit 104 that supports 4: 2: 2 color difference input has been described. On the other hand, the ratio between the luminance signal and the color difference signal is not limited to 4: 2: 2, but the present invention can be applied to a monitor for color difference input of a 4: 1: 1 system.

  FIG. 4 shows the arrangement order of signals of the 4: 1: 1 system, and the color difference signal has a data amount of 1/4 with respect to the luminance signal. In this case, if the data array 401 is simply reversed left and right as indicated by 402, the color difference signals Cb0 and Cr0 correspond to the luminance signal Y3, so that the centroids of luminance and color difference are shifted. Therefore, when this is subjected to RGB conversion processing by the conversion processing unit 117 in the display unit 104 and displayed on the liquid crystal panel 118, it is recognized as color blur.

  Therefore, based on the detection result of the direction of the display unit 104 from the direction detection unit 119, the position (timing) of the luminance signal output to the display unit 104 is changed as in the case of the 4: 2: 2 system. However, in the case of the 4: 1: 1 system, the shift amount of the luminance signal is different from that of the 4: 2: 2 system. In the 4: 2: 2 method, the ratio of the data amount of the luminance signal and the color difference signal was 2: 1, whereas in the 4: 1: 1 method, the ratio is only 4: 1. Therefore, the luminance signal and the color difference signal are reversed in order of reading for each horizontal line, and the luminance signal is shifted by 3 pixels so that it precedes the color difference signal. By this processing, the centroid of the color difference is maintained like the color difference signals Cb0 and Cr0 corresponding to the luminance signal Y0. Note that the pixel loss at the edge of the screen due to the shift of the luminance signal is interpolated with the adjacent luminance data Y0.

  Thus, the shift amount of the luminance signal and the number of interpolated pixels can be determined as a predetermined number of pixels according to the ratio of the data amount of the luminance signal and the color difference signal. The control unit 106 stores information on luminance and color difference pixel arrangement input by the display unit 104, that is, information such as 4: 2: 2 or 4: 1: 1 in an internal nonvolatile memory. The output of the image signal to the display unit 104 is controlled based on the information on the pixel arrangement.

  Hereinafter, the flow of the horizontal reversal process will be described with reference to the flowchart of FIG. The processing is executed in the color difference processing unit 114 by executing a corresponding processing program.

  In step S <b> 501, the color difference processing unit 114 determines the orientation of the display unit 104 based on a signal representing a detection result from the direction detection unit 119. When the display unit 104 has the first orientation, reading is sequentially performed from the memory 113 by the normal reading in S502. On the other hand, if the second direction is determined in S501, the color difference processing unit 114 performs reverse reading of data from the memory 113 by left / right reverse reading in S503. Further, in the Y shift and interpolation processing of S504, the Y signal is shifted by a predetermined pixel, and at the same time, the data for the predetermined pixel at the right end of the missing screen is interpolated with the adjacent luminance data Y0.

  In this way, when the video scanning direction is switched between right and left, the luminance signal is shifted by a predetermined pixel according to the ratio of the data amount of the luminance signal and the color difference signal and preceded by the color difference signal. It becomes possible to match the signal and the center of gravity. As a result, color bleeding at the time of panel display can be effectively prevented.

[Embodiment 2]
In the first embodiment described above, the image processing apparatus of the present invention has been described as the camera 100 having the imaging unit 101. However, the present invention is not limited to a camera, and can be applied to a video display device that supports color difference input. Therefore, in the following, an image processing apparatus corresponding to this embodiment will be described by taking as an example a projector that can be used by suspending the apparatus main body upside down from the ceiling.

  FIG. 6A is a diagram showing a configuration of a projector 600 as an image processing apparatus corresponding to the present embodiment. In the projector 600 of FIG. 6A, each block may be configured by hardware using a dedicated logic circuit or memory, except for a physical device such as a projection element or a lens. Alternatively, the processing program stored in the memory may be configured by software by a computer such as a CPU executing the processing program.

  The communication unit 601 is a communication interface that receives an input of an image signal from an external device. For example, the communication unit 601 corresponds to a communication protocol such as HDMI, USB, and IEEE1394. The memory 602 stores moving image data, display image signals, compressed moving image data, and other information. The projection control unit 603 outputs a moving image and various types of information to the projection unit 604 in accordance with instructions from the control unit 606. The projection unit 604 includes a known projection device such as an optical system such as a zoom lens and a focus lens, a liquid crystal panel, and a DMD (digital mirror device).

  In this embodiment, the word “projection” is used in view of the nature of the projector, “projecting an image onto a screen at a position away from the apparatus”. “Projection” and “Display” have the same concept in that they are provided in the same manner. In the present embodiment, the terms “projection unit” and “projection control unit” are used for explanation, but these can be basically regarded as “display unit” and “display control unit”.

  The signal processing unit 605 decodes the moving image data received from the external device, and expands the information amount. The control unit 606 includes a microcomputer and other necessary memory, and controls the operation of each unit of the projector 600 according to a program stored in a nonvolatile memory (not shown). The operation unit 607 includes various switches such as a power switch, a menu switch, and an input switch that can be operated by the user. The control unit 606 receives a user instruction from the operation unit 607. Further, the user can operate the menu switch to project a menu screen from the projection unit 604, and use this menu screen to change the operation mode or the like of the projector 600 or change the setting.

  The reproduction unit 608 reproduces various information such as compressed moving image data from the recording medium 609 in accordance with an instruction from the control unit 606. A recording medium 609 is a randomly accessible recording medium such as a memory card. In this embodiment, the recording medium 609 is assumed to be a replaceable memory card with a built-in flash memory. Further, the recording medium 609 is configured to be easily mounted and discharged by the user with respect to the projector 600 by a mounting and discharging mechanism (not shown). The internal bus 610 is used to transfer various data and commands between the units of the projector 600.

  Next, reproduction processing by the projector 600 will be described. When reproducing moving image data provided from an external device via the communication unit 601, the received moving image data is stored in the memory 602. The signal processing unit 605 reads out the moving image data from the memory 602, decodes it, and stores it in the memory 602 again. The projection control unit 603 reads the decoded moving image data from the memory 602 and supplies it to the projection unit 604.

  Next, the projection control unit 603 and the projection unit 604 in the present embodiment will be described. FIG. 6B is a diagram illustrating the configuration of the projection control unit 603 and the projection unit 604. In the present embodiment, the external device outputs moving image data having a horizontal screen of 1920 pixels × vertical 1080 pixels. In the moving image data output from the external device, the ratio of the number of pixels of the luminance signal Y and the two types of color difference signals Cr and Cb is 4: 2: 2. The signal processing unit 605 decodes the moving image data of horizontal 1920 pixels × vertical 1080 pixels. In addition, the number of pixels of the liquid crystal panel 618 in the projection unit 604 is also 1920 horizontal pixels × 1080 vertical pixels.

  The moving image data decoded by the signal processing unit 605 is input to the screen size conversion unit 611 in FIG. The screen size converter 611 receives moving image data composed of a luminance signal Y and color difference signals Cr and Cb. When the number of pixels of the luminance signal of each frame of the input moving image data does not match the number of display pixels on the liquid crystal panel, the screen size conversion unit 611 converts the number of pixels to match. The moving image data in which the number of pixels is converted is output to the multiplex processing unit 612. The multiplex processing unit 612 multiplexes information such as various OSD data with respect to the moving image data from the screen size conversion unit 611 and outputs the multiplexed data to the memory 613. The moving image data stored in the memory 613 is output to the color difference processing unit 614. The color difference processing unit 614 corrects and outputs the output timing of the luminance signal according to the direction of the projection unit 604 (projector 600), as will be described later. The transmission unit 615 outputs the luminance signal and the color difference signal from the color difference processing unit 614 to the projection unit 604 in the LVDS format.

  In the projection unit 604, the reception unit 616 receives the luminance signal and the color difference signal from the projection control unit 603 and sends them to the conversion processing unit 617. The conversion processing unit 617 converts the luminance signal and the color difference signal into RGB signals and sends them to the liquid crystal panel 618. The liquid crystal panel 618 controls the incident light from the backlight according to the RGB signals and projects an image on a screen or the like. In addition, the direction detection unit 619 detects the direction of the projection unit 604, that is, the direction of the projector 600 and outputs the detected direction to the control unit 606. For example, a gyro sensor can be used as the direction detection method. Since a known method can be used as the detection method itself, a more detailed description is omitted in this specification. The arrangement position of the direction detection unit 619 is not limited to the projection unit 604, and may be any location in the projector 600.

  Next, correction processing by the color difference processing unit 614 will be described. FIG. 7 is a diagram showing the external appearance of the projector 600. FIG. 7 shows a state in which an image of a moving subject is projected on a transmissive screen. FIG. 7A shows the projector 600 placed on the floor. Since the position (orientation) of the liquid crystal panel 618 of the projection unit 604 does not change with respect to the projector 600 main body, the orientation of the projection unit 604 directly corresponds to the orientation of the projector 600 main body. In the case of FIG. 7A, since the projector 600 is placed on the floor, the orientation of the liquid crystal panel 618 is also non-inverted with respect to the top and bottom. A direction in which the projection unit 604 faces in this state is referred to as a first direction. On the other hand, FIG.7 (b) has shown the state suspended from the ceiling. In this case, the projector 600 is turned over, and the orientation of the liquid crystal panel 618 is upside down with respect to the top and bottom. A direction in which the projection unit 604 faces in this state is referred to as a second direction.

  The projector 600 has a projection lens 701 and projects an image on the transmission screen 702. In the case of floor placement, the image 703 is projected onto the screen 702, and when it is suspended from the ceiling, it is inverted vertically and horizontally like the image 703b. In order to display the display position like the image 703a, it is necessary to display the image upside down, and the image signal is transferred upside down. When the image signal is inverted vertically and horizontally, the horizontal reversal is as described with reference to FIG. With respect to upside down, the output order in the vertical direction of the horizontal line of the image signal is reversed. Note that the shift of the center of gravity between the luminance signal and the color difference signal does not occur depending on the change in the output order of the lines in the vertical direction, so that pixel shift and interpolation processing are unnecessary.

  Next, processing in the color difference processing unit 614 in this embodiment will be described with reference to the flowchart in FIG. This processing is executed in the color difference processing unit 614 by executing a corresponding processing program.

  In step S <b> 801, the color difference processing unit 614 determines the orientation of the projection unit 604 based on a signal representing a detection result from the direction detection unit 619. Note that the direction of the projection unit 604 is also the direction of the projector 600. When the projection unit 604 has the first orientation, reading is sequentially performed from the memory 113 by the normal reading in S802. On the other hand, if the second direction is determined in S801, the color difference processing unit 614 reads out data from the memory 613 by upside down reading in S803. Further, the Y signal is shifted by a predetermined pixel by the Y shift and interpolation processing in S804, and at the same time, the data for the predetermined pixel at the right end of the screen to be lost is interpolated with the adjacent luminance data Y0.

  As described above, when the scanning direction of the image is switched between the upper, lower, left, and right directions, the luminance signal is shifted in the horizontal direction by a predetermined pixel corresponding to the data amount ratio between the luminance signal and the color difference signal to precede the color difference signal. This makes it possible to match the color difference signal and the center of gravity. This effectively prevents color bleeding during image projection.

  In the above description, the example of upside down and left and right reversal when the transmission type screen 702 is used has been described. In addition to this, when the projector 600 is installed on the floor and the screen to be used is changed between the transmissive type and the non-transmissive type, the image is reversed left and right in the case of the transmissive type compared to the non-transmissive type. Therefore, the same processing as in the first embodiment is performed. In this case, upside down is unnecessary.

[Other Embodiments]
The present invention can also be realized by executing the following processing. That is, software (program) that realizes the functions of the above-described embodiments is supplied to a system or apparatus via a network or various storage media, and a computer (or CPU, MPU, or the like) of the system or apparatus reads the program. It is a process to be executed.

Claims (8)

An input means for inputting an image signal composed of a luminance signal and a color difference signal;
Display means for performing display based on an image signal composed of a luminance signal and a color difference signal;
Detection means for detecting the orientation of the display means;
Control means for outputting an image signal input by the input means to the display means, and controlling an output order of the image signals to the display means in accordance with the direction of the display means detected by the detection means. Control means for
The control means includes
It said detecting means when detecting the first orientation, and output to the luminance signal and the display means in a predetermined order to output order of the color difference signal,
When the detection unit detects a second direction that is opposite to the first direction, the output order is reverse to the predetermined order for each horizontal line of the image signal. In addition, the luminance signal is timed so that the color difference signal corresponding to the predetermined luminance signal is output at a timing corresponding to the output of the predetermined luminance signal corresponding to the color difference signal in the input image signal. An image processing apparatus for outputting to the display means in an order preceding the color difference signal by a predetermined number of pixels in the direction. An input means for inputting an image signal composed of a luminance signal and a color difference signal;
Display means for performing display based on an image signal composed of a luminance signal and a color difference signal;
Detection means for detecting the orientation of the display means;
Control means for outputting an image signal input by the input means to the display means, and controlling an output order of the image signals to the display means in accordance with the direction of the display means detected by the detection means. Control means to
With
The control means includes
When the detection unit detects the first direction, the output order of the luminance signal and the color difference signal is output to the display unit in a predetermined order,
When the detection unit detects a second direction that is opposite to the first direction, the output order is reverse to the predetermined order for each horizontal line of the image signal. And, the luminance signal is output to the display means in an order that precedes the color difference signal by a predetermined number of pixels in the time direction,
Wherein the missing luminance signal as a result of the ahead of the predetermined pixel by the number of the color difference signals the luminance signal to the time direction, by interpolation using the luminance signal which lies adjacent to the position of the missing luminance signal An image processing apparatus that outputs to the display means. An input means for inputting an image signal composed of a luminance signal and a color difference signal;
Display means for performing display based on an image signal composed of a luminance signal and a color difference signal;
Detection means for detecting the orientation of the display means;
Control means for outputting an image signal input by the input means to the display means, and controlling an output order of the image signals to the display means in accordance with the direction of the display means detected by the detection means. Control means to
With
The control means includes
When the detection unit detects the first direction, the output order of the luminance signal and the color difference signal is output to the display unit in a predetermined order,
When the detection unit detects a second direction that is opposite to the first direction, the output order is reverse to the predetermined order for each horizontal line of the image signal. The luminance signal is output to the display means in the order of the predetermined number of pixels determined in accordance with the ratio of the number of pixels of the luminance signal and the color difference signal in the time direction. An image processing apparatus. The direction of the display means is the direction with respect to the image processing apparatus,
Said first orientation, the orientation direction of the back of the image processing apparatus, the second orientation, any one of claims 1 to 3, wherein the facing direction of the front of the image processing apparatus An image processing apparatus according to 1. The direction of the display means corresponds to the direction of the image processing device, and the second direction is a direction in which the image processing device is turned over,
Said control means further, when the detecting means detects the second orientation, one of claims 1 to 3, characterized in that a further reverse the output order of the vertical direction of the horizontal lines of the image signal The image processing apparatus according to claim 1.   The image signal includes the luminance signal and a plurality of types of color difference signals, and the number of pixels of the luminance signal in the image signal is greater than the number of pixels of each of the plurality of types of color difference signals. The image processing apparatus according to claim 1.   7. The image signal according to claim 1, wherein the center of gravity of a luminance signal at a predetermined position and a color difference signal corresponding to the luminance signal at the predetermined position are matched. The image processing apparatus described. A control method for an image processing apparatus, comprising:
The image processing apparatus includes:
An input means for inputting an image signal composed of a luminance signal and a color difference signal;
Display means for performing display based on an image signal composed of a luminance signal and a color difference signal;
Detection means for detecting the orientation of the display means;
Control means for outputting an image signal input by the input means to the display means, and controlling an output order of the image signals to the display means in accordance with the direction of the display means detected by the detection means. Control means for
The control method of the image processing apparatus is:
The control means is
A step wherein the detecting means when detecting the first orientation, to be outputted to the luminance signal and the display means in a predetermined order to output order of the color difference signal,
When the detection unit detects a second direction that is opposite to the first direction, the output order is reverse to the predetermined order for each horizontal line of the image signal. In addition, the luminance signal is timed so that the color difference signal corresponding to the predetermined luminance signal is output at a timing corresponding to the output of the predetermined luminance signal corresponding to the color difference signal in the input image signal. And a step of outputting to the display means in an order preceding the color difference signal by a predetermined number of pixels in the direction.

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