JP2013008280A - Projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type video display device capable of handling video data and OSD data exceeding input resolution of a geometric correction circuit.SOLUTION: The projection type video display device includes: an input processing part to which video data is input; an image processing part which has screen information data, and processes resolution of the video data input from the input processing part and the screen information data; and an output processing part which projects the video data and screen information data processed by the image processing part. The image processing part includes a geometric correction part which makes geometric corrections on the video data input from the input processing part and the screen information data; a first scaling part which performs first conversion of resolutions of the video data and screen information data to within a range of input resolutions to the geometric correction part, and puts together and outputs the video data and screen information data, having been subjected to the first conversion, to the geometric correction part; and a second scaling part which performs second conversion of an output resolution from the geometric correction part to within a range of input resolutions to the output processing part, and puts together and output the video data and screen information data, having been subjected to the second conversion, to the output processing part.

Description

  The present invention relates to a projection display apparatus, and more particularly to a projection display apparatus capable of handling an image signal exceeding the input / output resolution of a geometric correction circuit.

  2. Description of the Related Art In recent years, a technology has been developed in which a high-resolution video is input to a projection-type video display device such as a projector and projected onto a screen or the like without reducing the resolution.

  As a technique for accurately displaying a high-resolution video, for example, a technique described in Japanese Patent Laid-Open No. 2009-75646 (Patent Document 1) is known. Japanese Patent Laying-Open No. 2009-75646 (Patent Document 1) discloses a video display system capable of displaying a video shot using a fisheye lens or the like at a lower cost while suppressing deterioration in video quality, and parameters of the system It aims to provide a generation method.

  The invention of Japanese Patent Laid-Open No. 2009-75646 (Patent Document 1) forms part of an input image based on an image supply unit that supplies an input image that is an image generated under conditions based on imaging parameters, and an extraction parameter. An image cutout unit that cuts out a rectangular area and outputs it as a cutout image, a correction unit that performs geometric correction on the cutout image based on the geometric correction parameter, and an image output by the correction unit are displayed. The geometric correction parameter is a correction parameter such that a desired image can be obtained on the display unit when the image generated based on the projection parameter based on the design value of the display unit is corrected and output. An image generated based on a first correction parameter, an imaging parameter and an extraction parameter, and an image generated based on a projection parameter; There is a correction parameter second combines the correction parameter is a correction parameter for correcting the difference.

JP 2009-75646 A

  In the invention disclosed in Japanese Patent Application Laid-Open No. 2009-75646 (Patent Document 1), when a video signal exceeding the input resolution limit of the geometric correction circuit is input, this video signal can be input by a Scaler circuit or the like. The resolution is converted and input to the geometric correction circuit. However, since the output from the geometric correction circuit is subject to the restrictions on the output resolution of the geometric correction circuit, the resolution of the input video signal and the output resolution are not necessarily the same, and there is a problem in that an image with degraded resolution is output. It was.

  Also, the geometric correction circuit cannot freely change the input / output resolution, and if the resolution of the input video is larger than the maximum input resolution of the geometric correction circuit, the video is output without being displayed accurately. It had been.

  Furthermore, the same problem occurs with respect to OSD (On-Screen Display) data, which is screen information data of a projection display apparatus such as a projector.

  An object of the present invention is to provide a projection display apparatus that can handle image data and OSD data exceeding the input resolution of a geometric correction circuit.

  According to the present invention, there is provided a projection-type image display device having an input processing unit to which video data is input and screen information data, and processing the resolution of the video data and screen information data input from the input processing unit. An image processing unit and an output processing unit for projecting video data and screen information data processed by the image processing unit are provided. The image processing unit performs geometric correction on the video data and the screen information data input from the input processing unit, and sets the resolution of the video data and the screen information data within the range of the input resolution to the geometric correction unit. A first scaling unit that performs the first conversion, combines the video data and the screen information data that have undergone the first conversion and outputs them to the geometric correction unit, and outputs the resolution from the geometric correction unit to the output processing unit And a second scaling unit that performs second conversion within the range of the input resolution, synthesizes the video data and screen information data subjected to the second conversion, and outputs them to the output processing unit.

  Preferably, the first scaling unit includes a first conversion unit having screen information data, and a second conversion unit that combines the screen information data and the video data and outputs the combined information to the geometric correction unit.

  Preferably, any one of the first and second scaling units controls the line memory storing the video data, the scaling processing unit converting the resolution of the video data, and the line memory to the scaling processing unit. A line memory control unit that outputs the video data stored in the image data, and a synthesis processing unit that synthesizes the screen information data and the video data output from the scaling processing unit.

  Preferably, the synthesis processing unit performs synthesis of the video data and the screen information data by overwriting the screen information data on the video data.

  Preferably, the geometric correction unit has a function of passing data output from the first scaling unit without performing geometric correction.

  According to the present invention, a high-resolution video signal exceeding the maximum input resolution of the geometric correction unit can be appropriately displayed on the screen.

It is a block diagram which shows the structure of the projection type video display apparatus 100 of the examination example. 3 is a block diagram illustrating a configuration of an image processing unit 2. FIG. It is a figure for demonstrating the image | video displayed with the projection type video display apparatus 100 of the examination example. It is a block diagram which shows the structure of 100 A of projection type video display apparatuses of embodiment. It is a block diagram which shows the structure of 2 A of image processing parts. 3 is a block diagram illustrating a configuration of a scaling unit 20. FIG. It is a figure for demonstrating the relationship between the video data for 1 horizontal line stored in the line memory M0, and the video data of 1 pixel match | combined with output resolution. It is a figure for demonstrating the relationship between the video data for one horizontal line stored in the line memory M1, the video data of 1 pixel according to output resolution, and OSD data. It is a figure for demonstrating the operation example A of 100 A of projection type video display apparatuses of embodiment. It is a figure for demonstrating the operation example B of the projection type video display apparatus 100A of embodiment. It is a figure for demonstrating the operation example C of 100 A of projection type video display apparatuses of embodiment. It is a figure for demonstrating the operation example D of the projection type video display apparatus 100A of embodiment. It is a flowchart for demonstrating conversion of the video data in case geometric correction is required. It is a flowchart for demonstrating conversion of the video data when geometric correction is unnecessary. 5 is a flowchart for explaining a case where OSD data is input to a geometric correction unit 30 and geometric correction is necessary. 5 is a flowchart for explaining a case where OSD data is input to a geometric correction unit 30 and geometric correction is not necessary. 6 is a flowchart for explaining a case where OSD data is not input to the geometric correction unit 30; It is a figure which shows the image | video displayed with the projection type video display apparatus 100A of embodiment.

  Hereinafter, the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in a figure, and the description is not repeated.

[Examination example]
FIG. 1 is a block diagram illustrating a configuration of a projection display apparatus 100 of an examination example. Referring to FIG. 1, an input processing unit 1 to which an image is input, an image processing unit 2, an output processing unit 3, a control unit 4, a storage unit 5, and an operation unit 6 are included.

  The input processing unit 1 is given a signal output from an external input image supply device or the like. The image processing unit 2 processes the video data input by the input processing unit 1 and inputs the video to the output processing unit 3.

  Although not shown, the output processing unit 3 includes a projection lens device, and is enlarged and projected on the screen by the projection lens device.

  This projection lens device adjusts the zoom state and focus state of a projected image by changing a lens group (not shown) for forming an image of projection light on a screen and changing part of these lens groups in the optical axis direction. An actuator (not shown) is provided.

  The control unit 4 controls the operation of each unit of the projector by executing a control program. The storage unit 5 stores a program for causing the control unit 4 to perform each process of the projection display apparatus 100, OSD data, and the like. The OSD data is also stored in the scaler 10 described later.

  Although the operation unit 6 may be provided inside the projector or externally like a remote controller, the operation unit 6 is operated by a user, and control according to the operation is performed. Note that the projection display apparatus 100 has a function of superimposing and displaying OSD data as various setting information in addition to displaying an image.

  FIG. 2 is a block diagram illustrating a configuration of the image processing unit 2. Referring to FIG. 2, the image processing unit 2 includes a scaler 10 and a geometric correction unit 30.

  The Scaler 10 has a storage unit (not shown), and OSD data is stored in the storage unit. The Scaler 10 has a function of controlling the OSD data, and outputs the video data and OSD data input by the input processing unit 1.

  The geometric correction unit 30 performs geometric correction on an image whose input resolution is limited (for example, a horizontal resolution of 1920 pixels and a vertical resolution of 1080 pixels).

  The scaler 10 and the geometric correction unit 30 are respectively controlled by the control unit 4. Further, whether or not OSD data is input to the geometric correction unit 30 and the change of the input resolution are set via the operation unit 6 in FIG. 1, and the setting information is read into the control unit 4.

  FIG. 3 is a diagram for explaining an image displayed on the projection display apparatus 100 of the examination example.

  Referring to FIG. 3, screen 400 projects an image based on the input video signal onto projected video surface 410 of screen 400. On the projected image plane 410, an image projected by the projection display apparatus 100 (hereinafter referred to as a projected image) is projected. This projection image includes images D1, D2A, D2B, and D3.

  In the projection display apparatus 100 of the examination example, since the image processing unit 2 includes the scaler 10 and the geometric correction unit 30, when the resolution of the input video exceeds the maximum input resolution of the geometric correction unit 30 or the geometric correction unit When the resolution output from 30 exceeds the resolution of the output processing unit 3, no correction is made or the input resolution is inappropriate. Do not show.

[Embodiment]
FIG. 4 is a block diagram illustrating a configuration of the projection display apparatus 100A according to the embodiment. With reference to FIG. 1 and FIG. 4, the projection type video display apparatus 100 </ b> A of the embodiment will be described while comparing with the projection type video display apparatus 100 of the examination example.

  The projection display apparatus 100A according to the embodiment adds an image processing unit 2A in place of the image processing unit 2 to the configuration of the projection display apparatus 100 of the study example.

  FIG. 5 is a block diagram illustrating a configuration of the image processing unit 2A. Referring to FIG. 5, the image processing unit 2 </ b> A has a resolution of video data or the like from the input processing unit 1 so that the geometric correction unit 30 can appropriately perform image processing in the configuration of the image processing unit 2 of the examination example. Is included in the range of the maximum input resolution of the geometric correction unit 30. The scaling unit 20 performs resolution conversion. Furthermore, the image processing unit 2A includes a scaling unit 40 that performs resolution conversion so that the resolution of the video data or the like output from the geometric correction unit 30 falls within the range of the maximum output resolution of the output processing unit 3.

  The scaling units 20 and 40 are composed of a general-purpose IC and an FPGA (Field Programmable Gate Array). The scaling units 20 and 40 perform upscaling processing or downscaling processing on the video data from the input processing unit 1 and the OSD data stored in the storage unit (not shown) of the Scaler 10.

  The upscaling process means a process for converting the video screen size to a larger one, while the downscaling process means a process for converting the video screen size to a smaller one.

  Further, the scaling units 20 and 40 can synthesize image data including the OSD output from the Scaler 10 and the video data input from the input processing unit 1, while the OSD is based on the combined data width. Data or video data can also be identified and output.

  Here, the relationship between the Scaler 10 and the scaling unit 20 will be described. The Scaler 10 and the scaling unit 20 have similar functions. However, since the Scaler 10 has various types as in the examination example and the functions thereof vary depending on the type, the scaler 10 always exceeds the maximum input resolution of the geometric correction unit 30 as in the projection display apparatus 100A of the embodiment. It is difficult to handle and properly output video data.

  Therefore, regardless of the function of the Scaler 10, by having the scaling units 20 and 40, smooth resolution conversion can be processed simultaneously.

  Note that when the scaler 10 has the function of the scaling unit 20, the scaling unit 20 is not necessary, and the output from the scaler 10 is directly input to the geometric correction unit 30.

  FIG. 6 is a block diagram illustrating a configuration of the scaling unit 20. Referring to FIG. 6, the scaling unit 20 includes a line memory control unit 22, a scaling processing unit 24, an OSD processing unit 26, and line memories M0 and M1.

  The line memory control unit 22 controls the image data output from the input processing unit 1 so that image data for one horizontal line is alternately stored in the line memories M0 and M1. Then, the video data stored in the line memories M0 and M1 is read and input to the scaling processing unit 24.

  For example, the scaling processing unit 24 converts the resolution of the video data of one horizontal line stored in the line memory M0 output from the line memory control unit 22. The converted video data is input to the OSD processing unit 26 and synthesized with the OSD data in the OSD processing unit 26. As a conversion method of the scaling processing unit 24, one pixel image data corresponding to the output resolution is generated based on a plurality of pixels of video data for one horizontal line stored in the line memory, using a scaling rule described later. To do.

  Next, a method (scaling rule) for converting the input video will be described. If the input image horizontal coordinate x, the output image horizontal coordinate X, and the magnification Zx, these relationships are expressed as x = X / Zx or Zx = X / x. If the integer part of the input image horizontal coordinate x is m and the decimal part is α, m = [x] (the maximum integer not exceeding x) and α = x− [x]. Using these, the image data value f (X) of the output coordinates is expressed as f (X) = (1−α) * f (m) + α * f (m + 1) (Formula 1). Using this (Equation 1), one pixel of video output from a plurality of input pixels is generated. The method for converting the input video is not limited to the above, and other interpolation methods may be used.

  Note that when the Scaler 10 has a function of superimposing OSD data on video data, the OSD processing of the scaling unit 20 is unnecessary, and the video on which OSD data is superimposed by the Scaler 10 is input to the line memory control unit 22 of the scaling unit 20. .

  FIG. 7 is a diagram for explaining the relationship between video data for one horizontal line stored in the line memory M0 and video data for one pixel in accordance with the output resolution.

  6 and 7, for example, the line memory M0 stores 1920 pixels for one horizontal line input from the input processing unit 1. Here, the scaling processing unit 24 in FIG. 6 generates the output one pixel D00 based on the plurality of pixels P0 and P1 according to the above scaling rule. During this process, the line memory M1 stores video data for the next horizontal line under the control of the line memory control unit 22.

  The scaling processing unit 24 converts the video data for 1920 pixels stored in the line memory M0 into video data for 2048 pixels and outputs the video data to the OSD processing unit 26. On the other hand, during this conversion process, 1920 pixels for the next horizontal line are stored in the line memory M1.

  When the output from the line memory M0 is completed, the line memory M1 is subjected to the same processing as the line memory M0. During this process, the next video data is further captured and stored in the line memory M0. In this way, by switching the line memories M0 and M1 alternately and using them, the converted data is smoothly output to the scaling processing unit 24 without delay.

  The video data converted in the scaling processing unit 24 is input to the OSD processing unit 26. The OSD processing unit 26 overwrites the video data output from the scaling processing unit 24 with OSD data including display coordinate information. The overwritten data is input to the geometric correction unit 30, for example.

  FIG. 8 is a diagram for explaining the relationship among video data for one horizontal line stored in the line memory M1, video data for one pixel in accordance with the output resolution, and OSD data.

  6 and 8, for example, the line memory M1 stores 1920 pixels for one horizontal line input from the input processing unit 1. Here, the scaling processing unit 24 of FIG. 6 generates the output one pixel D01 based on the plurality of pixels Q0 and Q1 according to the above scaling rule. During this process, the line memory M0 stores video data for the next one horizontal line under the control of the line memory control unit 22.

  The scaling processing unit 24 converts the video data for 1920 pixels stored in the line memory M1 into video data for 2048 pixels and outputs the video data to the OSD processing unit 26.

  When the output from the line memory M1 is completed, the OSD processing unit 26 overwrites the plurality of OSD data R0, R1, R2 including the position information as OSD data S0, S1, S2. The relationship between the input OSD data R0, R1, and R2 and the output OSD data S0, S1, and S2 may be the same, or the OSD data R0, R1, and R2 are converted by the above scaling law. OSD data may be used. When this process is completed, the same process as the line memory M1 is performed again on the line memory M0. During this process, the line memory M1 starts to fetch the next video data. In this way, by switching the line memories M0 and M1 alternately and using them, the converted data and the OSD data are smoothly synthesized and output by the OSD processing unit 26 without delay.

  As described above, the two cases of the line memories M0 and M1 have been described with reference to FIGS. 6 to 8. However, the present invention is not limited to this, and the scaling unit 20 can also be provided with a plurality of line memories, and the line memory control. The unit 22 can control a plurality of line memories.

  Note that the scaling unit 40 has the same configuration as the scaling unit 20, and therefore description thereof will not be repeated.

  Hereinafter, an operation example of the embodiment will be described. Here, for convenience of explanation, the resolution is 2K when (horizontal resolution, vertical resolution) = (2048, 1080), and the resolution is 1080p when (horizontal resolution, vertical resolution) = (1920, 1080). And In operation examples A to D described with reference to FIGS. 9 to 12, video data with a resolution of 2K is input to the input processing unit 1. Further, OSD data having a resolution of 2K stored in a storage unit (not shown) of the Scaler 10 is used. In addition, there is a limitation that the maximum input / output resolution of the geometric correction unit 30 is 1080p, and the output resolution of the output processing unit 3 will be described as resolution 2K.

  FIG. 9 is a diagram for explaining an operation example A of the projection display apparatus 100A according to the embodiment. Referring to FIG. 9, video data with a resolution of 2K is input to the input processing unit 1, and this video data and OSD data with a resolution of 2K stored in a storage unit (not shown) of the Scaler 10 are converted by the Scaler 10 to a resolution of 2K. Downscaling processing to a resolution of 1080p is performed, and the downscaled data is input to the scaling unit 20. By this resolution conversion, since the resolution is already equal to or less than the maximum input resolution (1080p) of the geometric correction unit 30, the scaling unit 20 does not further downscale the converted video data and OSD data. Data is input to the geometric correction unit 30.

  The data input in the geometric correction unit 30 is subjected to geometric correction and output to the scaling unit 40. Since the output resolution of the output processing unit 3 is 2K, the scaling unit 40 performs an upscaling process for converting the video data and the OSD data output from the geometric correction unit 30 from the resolution 1080p to the resolution 2K, and outputs the synthesized data. The video data and the OSD data are output from the output processing unit 3 to a screen or the like.

  FIG. 10 is a diagram for explaining an operation example B of the projection display apparatus 100A according to the embodiment. Referring to FIG. 10, video data with a resolution of 2K is input to the input processing unit 1, and this video data and OSD data with a resolution of 2K stored in a storage unit (not shown) of the Scaler 10 are converted in resolution in the Scaler 10. Without being input to the scaling unit 20. To reduce the resolution to the maximum input resolution (1080p) or less of the geometric correction unit 30, the scaling unit 20 performs downscaling processing on the video data and OSD data output from the Scaler 10 to a resolution of 1080p. The downscaled data is input to the geometric correction unit 30.

  The data input in the geometric correction unit 30 is not geometrically corrected and is input to the scaling unit 40 as it is (through processing). Since the output resolution of the output processing unit 3 is 2K, the scaling unit 40 performs an upscaling process for synthesizing the video data and OSD data output from the geometric correction unit 30 from resolution 1080p to resolution 2K. Is output. The combined video data and OSD data are output from the output processing unit 3 to a screen or the like.

  FIG. 11 is a diagram for explaining an operation example C of the projection display apparatus 100A according to the embodiment. Referring to FIG. 11, video data with a resolution of 2K is input to the input processing unit 1, and this video data and OSD data with a resolution of 2K stored in a storage unit (not shown) of the Scaler 10 are converted in resolution in the Scaler 10. Without being input to the scaling unit 20. In order to obtain a resolution equal to or lower than the maximum input resolution (1080p) of the geometric correction unit 30, the scaling unit 20 performs downscaling processing on the video data and OSD data output from the Scaler 10 from the resolution 2K to the resolution 1080p. The downscaled data is input to the geometric correction unit 30.

  The data input in the geometric correction unit 30 is geometrically corrected and input to the scaling unit 40. Since the output resolution of the output processing unit 3 is limited to 2K when the output resolution is video data, and 1080p when the output resolution is OSD data, the scaling unit 40 has a resolution of 1080p for the video data output from the geometric correction unit 30. To upscaling to 2K, while OSD data is not upscaled. The video data and OSD data converted by the scaling unit 40 are synthesized and output. The synthesized output video data (resolution 2K) and OSD data (1080p) are output from the output processing unit 3 to a screen or the like.

  FIG. 12 is a diagram for explaining an operation example D of the projection display apparatus 100A according to the embodiment. Referring to FIG. 12, video data with a resolution of 2K is input to the input processing unit 1, and this video data and OSD data with a resolution of 2K stored in a storage unit (not shown) of the Scaler 10 are converted in resolution in the Scaler 10. The data is input to the scaling unit 20 without being processed. In this operation example D, the OSD data is directly input to the scaling unit 40 without passing through the geometric correction unit 30. On the other hand, if the video data is passed (bypassed) through the geometric correction unit 30, the scaling unit 20 outputs the video data output from the Scaler 10 in order to make the resolution less than the maximum input resolution (1080p) of the geometric correction unit 30. Downscaling is performed from 2K to 1080p. On the other hand, the OSD data is output without being downscaled by the scaling unit 20.

  The down-scaled video data is input to the geometric correction unit 30, while the OSD data is directly input to the scaling unit 40 without passing through the geometric correction unit 30.

  The video data input in the geometric correction unit 30 is geometrically corrected and input to the scaling unit 40. Here, since the output resolution of the video data and the OSD data of the output processing unit 3 is limited to a resolution of 2K, the scaling unit 40 performs an upscaling process for changing the output video data from the resolution 1080p to the resolution of 2K, On the other hand, the OSD data is not subjected to the upscaling process, and the OSD data and the converted video data are synthesized and output. The combined video data (resolution 2K) and OSD data (resolution 2K) are output from the output processing unit 3 to a screen or the like.

  The operation examples A to D described above with reference to FIGS. 9 to 12 are not limited to this, and other operation examples can be considered. For example, although not shown, in Scaler 10, OSD data with a resolution of 2K is reduced in the horizontal direction, and the horizontal width of resolution 1080p is adjusted. At this time, the horizontal width is reduced to 1920/2048 = 0.9375 times. The scaler 10 or the scaling unit 20 downscales the reduced OSD data and the input video data with the resolution of 2K, and inputs them to the geometric correction unit 30. After geometric correction, the input video data and OSD data are upscaled in the horizontal direction by the scaling unit 40. Video data and OSD data with a resolution of 2K output from the scaling unit 40 are output from the output processing unit 3 to a screen or the like.

  The maximum input / output resolution of the geometric correction unit 30 has been described as the same resolution 1080p, but a geometric correction unit having different maximum input resolution and maximum output resolution may be used. Even in this case, since the maximum input / output resolution is limited, it is possible to handle video data and OSD data of the maximum input / output resolution or higher by having the configuration of the embodiment. Further, the function of the scaling unit 40 may be included in the geometric correction unit 30.

  Note that although the resolution conversion in the horizontal direction is described here, the present invention can also be applied in the vertical direction. Although the output resolution of the output processing unit 3 has been described as the resolution 2K, the present invention is not limited to this, and can be applied to a resolution exceeding the maximum input / output resolution of the geometric correction unit 30.

  Hereinafter, the flow of video data and OSD data input to the projection display apparatus 100A of the embodiment will be described with reference to FIGS.

  FIG. 13 is a flowchart for explaining conversion of video data when geometric correction is necessary. The determination as to whether geometric correction is necessary is set by the user via the operation unit 6. Referring to FIG. 13, for example, when input of video data is started to input processing unit 1, in step S <b> 1, control unit 4 reads the header portion of the input video data and reads the input video data. Get resolution information. Further, the setting information of the geometric correction unit 30 input by the operation unit 6 is acquired.

  In step S <b> 2, the control unit 4 determines the size of the resolution of the input video data acquired in step S <b> 1 and the maximum input resolution of the geometric correction unit 30. If the control unit 4 determines in step S2 that the resolution of the input video data is larger than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S4, and the scaler 10 is used to input the video data to the geometric correction unit 30. It is determined whether or not to perform downscaling processing. On the other hand, if it is determined in step S2 that the resolution of the input video data is smaller than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S3.

  In step S3, the input video data is input to the geometric correction unit 30 without being downscaled by the scaler 10 and the scaling unit 20, the geometric correction processing is performed, and the process proceeds to step S7.

  On the other hand, in step S4, it is determined whether or not a downscaling process is performed by the Scaler 10 in order to cause the geometric correction unit 30 to input video data. In step S4, if the scaler 10 determines that the downscaling process is performed, the process proceeds to step S5. On the other hand, if it is determined in step S4 that the scaler 10 does not perform the downscaling process, the process proceeds to step S6 in which the scaling unit 20 performs the downscaling process.

  In step S5, the scaler 10 performs video data downscaling processing. In step S <b> 6, the control unit 4 performs downscaling processing of the video data by the scaling unit 20.

  Following step S3, step S5, and step S6, for step S7, video data that has been downscaled or not downscaled is input to the geometric correction unit 30, and the process proceeds to step S8.

  In step S8, it is determined whether or not the resolution of the video data output from the geometric correction unit 30 and the output resolution of the output processing unit 3 are the same. If it is determined that the resolution of the video data and the output resolution of the output processing unit 3 are the same, the process of step S11 is completed. Specifically, the scaling unit 40 does not perform the upscaling processing of the video data, but is input to the output processing unit 3 and the video data is projected onto a screen or the like. On the other hand, if it is determined that the resolution of the video data and the output resolution of the output processing unit 3 are not the same, the process proceeds to step S10.

  In step S10, the scaling unit 40 performs the upscaling process until the resolution of the video data reaches the output resolution of the output processing unit 3, and the processing in the next step S11 is completed.

  As described above, the conversion of the video data when the geometric correction is necessary is provided with the scaling units 20 and 40 that convert the resolution before and after the geometric correction unit 30. Video data having a resolution larger than the input resolution can be appropriately projected on the screen.

  FIG. 14 is a flowchart for explaining conversion of video data when geometric correction is unnecessary. The determination as to whether geometric correction is necessary is set by the user via the operation unit 6. Referring to FIG. 14, for example, when input of video data is started to input processing unit 1, in step S <b> 101, control unit 4 reads the header portion of the input video data and reads the input video data. Get resolution information. Further, the control unit 4 acquires setting information of the geometric correction unit 30 input by the operation unit 6.

  In step S102, the control unit 4 determines whether the resolution of the input video data acquired in step S101 and the maximum input resolution of the geometric correction unit 30 are large or small. This step S102 is necessary for the geometric correction unit 30 to perform through processing using the geometric correction unit 30 as a bypass instead of not performing geometric correction processing. If the control unit 4 determines in step S102 that the resolution of the input video data is greater than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S104 to input video data to the geometric correction unit 30. The scaler 10 determines whether or not the downscaling process is performed. On the other hand, if it is determined in step S102 that the resolution of the input video data is smaller than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S103.

  In step S103, the input video data is input to the geometric correction unit 30 without being downscaled by the scaler 10 and the scaling unit 20, and the process proceeds to step S107.

  On the other hand, in step S104, it is determined whether or not a downscaling process is performed by the Scaler 10 in order to cause the geometric correction unit 30 to input video data. If it is determined in step S104 that the scaler 10 performs the downscaling process, the process proceeds to step S105. On the other hand, if it is determined by the scaler 10 that the downscaling process is not performed in step S104 by the control unit 4, the process proceeds to step S106 where the scaling unit 20 performs the downscaling process.

  In step S105, the scaler 10 performs video data downscaling processing. In step S106, the scaling unit 20 performs video data downscaling processing.

  Following the processing in step S103, step S105, and step S106, the video data that has been downscaled or not downscaled in step S107 is input to the geometric correction unit 30. The geometric correction unit 30 passes (bypasses) the input video data without performing geometric correction. The control unit 4 acquires information on the video data input to the geometric correction unit 30, and the process proceeds to step S108.

  In step S108, it is determined whether the resolution of the video data bypassing the geometric correction unit 30 is the same as the output resolution of the output processing unit 3. If it is determined that the resolution of the video data and the output resolution of the output processing unit 3 are the same, the processing in step S111 is completed. Specifically, video data upscaling processing is not performed by the scaling unit 40, but the video data is input to the output processing unit 3 and projected onto a screen or the like. On the other hand, if it is determined that the resolution of the video data and the output resolution of the output processing unit 3 are not the same, the process proceeds to step S110.

  In step S110, the scaling unit 40 upscales the video data resolution to the output resolution of the output processing unit 3, and the processing in the next step S111 is completed.

  As described above, the conversion of the video data in the case where the geometric correction is not required is provided with the scaling units 20 and 40 that convert the resolution before and after the geometric correction unit 30, so that the resolution conversion is performed and the geometric correction unit 30 passes. By (bypassing), video data having a resolution larger than the maximum input resolution of the geometric correction unit 30 can be appropriately projected on the screen.

  FIG. 15 is a flowchart for explaining a case where OSD data is input to the geometric correction unit 30 and geometric correction is necessary. The determination as to whether geometric correction is necessary is set by the user via the operation unit 6. Referring to FIG. 15, for example, when the input of OSD data to input processing unit 1 is started, in step S <b> 21, control unit 4 stores the OSD data stored in the storage unit (not shown) of Scaler 10. Get resolution information. Further, the control unit 4 acquires setting information of the geometric correction unit 30 input by the operation unit 6.

  In step S22, the control unit 4 determines whether the resolution of the OSD data acquired in step S21 and the maximum input resolution of the geometric correction unit 30 are large or small. If the control unit 4 determines in step S22 that the resolution of the input OSD data is greater than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S24 to cause the geometric correction unit 30 to input OSD data. It is determined whether or not the downscaling process is performed by the Scaler 10. On the other hand, if it is determined in step S22 that the resolution of the OSD data is smaller than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S23.

  In step S23, the OSD data is input to the geometric correction unit 30 without being downscaled by the scaler 10 and the scaling unit 20, and the process proceeds to step S27.

  On the other hand, in step S24, the control unit 4 determines whether or not a downscaling process is performed by the Scaler 10 in order to cause the geometric correction unit 30 to input OSD data. In step S24, if the scaler 10 determines that the downscaling process is performed, the process proceeds to step S25. On the other hand, in step S24, if the scaler 10 determines that the downscaling process is not performed, the process proceeds to step S26 where the scaling unit 20 performs the downscaling process.

  In step S25, the scaler 10 performs OSD data downscaling processing. In step S26, the scaling unit 20 performs OSD data downscaling processing.

  Following the processing of step S23, step S25, and step S26, for step S27, the OSD data that has been downscaled or not downscaled is input to the geometric correction unit 30, and the geometric correction processing is performed. The process proceeds to S28.

  In step S28, it is determined whether or not conversion of the resolution of the OSD data output from the geometric correction unit 30 is necessary. If it is determined that the conversion of the resolution of the OSD data output from the geometric correction unit 30 is unnecessary, the conversion process of step S30 is not performed, and the process of step S31 is completed. Specifically, the OSD data upscaling process is not performed in the scaling unit 40, but the OSD data is input to the output processing unit 3 and projected onto a screen or the like. On the other hand, if it is determined that the resolution of the OSD data output from the geometric correction unit 30 needs to be converted, the process proceeds to step S29.

  In step S29, for example, the scaling unit 40 performs upscaling processing (conversion) from the resolution of the OSD data to the output resolution of the output processing unit 3, and the processing in the next step S31 is completed.

  As described above, the conversion of the OSD data when the geometric correction is necessary is performed by providing the scaling units 20 and 40 that convert the resolution before and after the geometric correction unit 30, thereby performing the resolution conversion. OSD data having a resolution larger than the input resolution can be appropriately projected on the screen.

  FIG. 16 is a flowchart for explaining a case where OSD data is input to the geometric correction unit 30 and no geometric correction is required. Referring to FIG. 16, for example, when the input of OSD data to input processing unit 1 is started, in step S <b> 121, control unit 4 stores the OSD data stored in the storage unit (not shown) of Scaler 10. Get resolution information. Further, the control unit 4 acquires setting information of the geometric correction unit 30 input by the operation unit 6.

  In step S122, the control unit 4 determines whether the resolution of the input OSD data acquired in step S121 and the maximum input resolution of the geometric correction unit 30 are large or small. This step S122 is necessary for the geometric correction unit 30 to perform through processing using the geometric correction unit 30 as a bypass instead of not performing geometric correction processing. If the control unit 4 determines in step S122 that the resolution of the input OSD data is greater than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S124, and the geometric correction unit 30 inputs OSD data. It is determined whether or not the downscaling process is performed by the Scaler 10. On the other hand, if it is determined in step S122 that the resolution of the OSD data is smaller than the maximum input resolution of the geometric correction unit 30, the process proceeds to step S123.

  In step S123, the input OSD data is input to the geometric correction unit 30 without being downscaled by the scaler 10 and the scaling unit 20, and the process proceeds to step S127.

  On the other hand, in step S <b> 124, the control unit 4 determines whether or not the Scaler 10 performs downscaling processing in order to cause the geometric correction unit 30 to input OSD data. In step S124, if the scaler 10 determines that the downscaling process is performed, the process proceeds to step S125. On the other hand, if it is determined in step S124 that the scaler 10 does not perform the downscaling process, the process proceeds to step S126 in which the scaling unit 20 performs the downscaling process.

  In step S125, the scaler 10 performs OSD data downscaling processing. In step S126, the scaling unit 20 performs OSD data downscaling processing.

  Following the processing of step S123, step S125, and step S126, the OSD data that has been downscaled or not downscaled is input to the geometric correction unit 30 in step S127. The geometric correction unit 30 passes (bypasses) the input OSD data without geometric correction. The control unit 4 acquires a signal in which the OSD data is input to the geometric correction unit 30, and the process proceeds to step S128.

  In step S128, it is determined whether it is necessary to convert the resolution of the OSD data bypassing the geometric correction unit 30. If it is determined that the conversion of the resolution of the OSD data bypassing the geometric correction unit 30 is unnecessary, the conversion process of step S130 is not performed, and the process of step S131 is completed. Specifically, the OSD data upscaling process is not performed in the scaling unit 40, but the OSD data is input to the output processing unit 3 and projected onto a screen or the like. On the other hand, if it is determined that conversion of the resolution of the OSD data bypassing the geometric correction unit 30 is necessary, the process proceeds to step S129.

  In step S129, the scaling unit 40 performs upscaling processing (conversion) to the resolution of the OSD data up to the output resolution of the output processing unit 3, and the processing in the next step S111 is completed.

  As described above, the conversion of the OSD data when the geometric correction is not required includes the scaling units 20 and 40 that convert the resolution before and after the geometric correction unit 30, so that the resolution conversion is performed, and the maximum of the geometric correction unit 30 is obtained. OSD data having a resolution larger than the input resolution can be appropriately projected on the screen.

  In step S129, for example, the control unit 4 acquires the upscaling processing information up to the resolution of the OSD data up to the output resolution of the output processing unit 3 in the scaling unit 40. Then, the process of step S131 is completed.

  As described above, the conversion of the OSD data when the geometric correction is unnecessary is performed by providing the scaling units 20 and 40 that convert the resolution before and after the geometric correction unit 30, so that the resolution conversion is performed and the geometric correction unit 30 passes. By (bypassing), OSD data having a resolution larger than the maximum input resolution of the geometric correction unit 30 can be appropriately projected on the screen.

  FIG. 17 is a flowchart for explaining a case where OSD data is not input to the geometric correction unit 30. Referring to FIG. 17, for example, when input of OSD data to input processing unit 1 is started, in step S <b> 41, control unit 4 stores OSD data stored in a storage unit (not shown) of Scaler 10. Get resolution information. Further, the control unit 4 acquires setting information of the geometric correction unit 30 input by the operation unit 6.

  In step S <b> 41, the control unit 4 completes the process by setting not to input to the geometric correction unit 30. Specifically, the OSD data is input to the scaling unit 40 without any resolution conversion. In the scaling unit 40, the OSD data and the video data are projected onto a screen or the like via the output processing unit 3.

  As described above, when the OSD data is not input to the geometric correction unit 30, it is output while retaining the resolution of the stored OSD data, and can be appropriately projected on the screen.

  FIG. 18 is a diagram illustrating an image displayed on the projection display apparatus 100A according to the embodiment. Referring to FIG. 18, compared with the image shown in FIG. 3, the projection display apparatus 100 </ b> A takes the configuration of the image processing unit 2 </ b> A so that image data exceeding the input resolution of the geometric correction unit 30 can be obtained. Even when it is input, the input video data is appropriately displayed on the edge side of the video screen without cutting the projected video. Although not shown, the same applies to the OSD data, and the description will not be repeated.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Input processing part, 2, 2A Image processing part, 3 Output processing part, 4 Control part, 5 Storage part, 6 Operation part, 20, 40 Scaling part, 22 Line memory control part, 24 Scaling processing part, 26 OSD processing part , 30 Geometric correction unit, 100, 100A Projection display device, 400 screen, 410 Projection image plane, M0, M1 Line memory.

Claims (5)

An input processing unit to which video data is input;
An image processing unit having screen information data, and processing the resolution of the video data and the screen information data input from the input processing unit;
An output processing unit for projecting the video data and the screen information data processed by the image processing unit;
The image processing unit
A geometric correction unit that performs geometric correction on the video data and the screen information data input from the input processing unit;
The first conversion is performed so that the resolution of the video data and the screen information data is within the range of the input resolution to the geometric correction unit, and the video data and the screen information data subjected to the first conversion are synthesized. A first scaling unit that outputs to the geometric correction unit;
The second conversion is performed so that the output resolution from the geometric correction unit falls within the range of the input resolution to the output processing unit, and the video data and the screen information data subjected to the second conversion are combined to output the output. A projection display apparatus including a second scaling unit for outputting to the processing unit. The first scaling unit includes
A first conversion unit having the screen information data;
The projection display apparatus according to claim 1, further comprising: a second conversion unit that synthesizes the screen information data and the video data and outputs the synthesized data to the geometric correction unit. One of the first and second scaling units is
A line memory for storing the video data;
A scaling processor for converting the resolution of the video data;
A line memory control unit that controls the line memory and causes the scaling processing unit to output the video data stored in the line memory;
The projection display apparatus according to claim 1, further comprising: a composition processing unit that combines the screen information data and the image data output from the scaling processing unit.   The projection type video display apparatus according to claim 3, wherein the synthesis processing unit performs synthesis of the video data and the screen information data by overwriting the screen information data on the video data.   The projection display apparatus according to claim 1, wherein the geometric correction unit has a function of passing data output from the first scaling unit without performing geometric correction.

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