JP2008160553A - Digital broadcast receiving apparatus and image display apparatus provided with the same - Google Patents

Abstract

Provided are a digital broadcast receiving apparatus capable of preventing image burn-in on a screen of an image display apparatus without causing loss of information contained in a video as much as possible and without performing complicated processing, and an image display apparatus using the same. .
A digital broadcast receiving apparatus that generates and outputs display image data including at least one of a moving image, graphics, and a still image based on received data from a digital broadcast includes a moving image, graphics, and Filter units 104, 106, and 108 that respectively perform filter processing on still images, and a filter switching control unit 112 that detects whether the display image includes graphics or still images, and the display image is graphics or When it is detected that a still image is included, the contents of the filter processing by the filter units 106 and 108 are changed.
[Selection] Figure 1

Description

  The present invention is a digital broadcast receiving apparatus that receives a digital broadcast, generates a display image, and outputs the display image to a display device, and in particular, a digital broadcast receiving apparatus that can prevent a screen burn of the display device, The present invention relates to an image display device used.

  Conventionally, a display device that performs display by causing a phosphor to emit light, such as a plasma display, has a problem that “burn-in” occurs. Burn-in is a phenomenon in which, when the same image is continuously displayed for a long time, a trace remains on the screen due to deterioration of the phosphor. Although the burn-in occurrence condition varies depending on the content of the displayed image, it tends to occur when an image or character with high brightness and high contrast is displayed for a long time. Generally, when the display time of the same image is accumulated to be several hundred hours or more, image sticking may occur.

As a method for preventing burn-in, it is effective to avoid displaying the same pixel continuously for a long time, in other words, displaying a still image for a long time. From this point of view, the pixel thinning process is performed in accordance with the screen size to reduce the area where burn-in occurs and prevent burn-in by reducing the display density (see Patent Document 1), or to a specific area of the screen A method of preventing burn-in by performing reduction and performing a process of enlarging another area so that a non-display portion of the video does not occur due to the reduction (see Patent Document 2) is known.
JP-A-8-314403 JP 2006-48068 A

  However, the conventional burn-in prevention method can prevent burn-in, but has a problem that other disadvantages occur.

  For example, in the burn-in prevention method described in Patent Document 1, it is difficult to recognize information held in a video unless the thinning rate is determined in consideration of the screen size. Further, in the case of interlaced display, there is a problem that the video signal is folded back by simple thinning. The burn-in prevention method described in Patent Document 2 requires two types of filter circuit for area reduction and filter circuit for area expansion. Further, there is a problem that the original video information is lost as the video is enlarged and reduced.

  In view of the above-described problems, the present invention uses a digital broadcast receiving apparatus that can prevent image burn-in on the screen of an image display apparatus without missing as much information as possible and without performing complicated processing. An object of the present invention is to provide an image display device.

  In order to achieve the above object, a digital broadcast receiving apparatus according to the present invention generates display image data including at least one of a moving image, graphics, and a still image based on received data from a digital broadcast. An output digital broadcast receiving apparatus that performs adjustment processing that is at least one of enlargement, reduction, and equal magnification processing on at least one of the moving image, graphics, and still image; A detection unit that detects whether or not the display image includes graphics or a still image; and when the detection unit detects that the display image includes graphics or a still image, the image adjustment processing unit And a process switching unit that changes the contents of the adjustment process.

  An image display apparatus according to the present invention includes the digital broadcast receiving apparatus according to the present invention and a display for displaying an image output from the digital broadcast receiving apparatus.

  According to the present invention, when the detection unit detects that the display image includes graphics or a still image, the processing switching unit changes the content of the adjustment processing by the image adjustment processing unit, thereby changing the display position or Screen burn-in can be prevented without changing the display size. As a result, it is possible to provide a digital broadcast receiving apparatus that can prevent image burn-in on the screen of the image display apparatus without missing as much information as possible and without performing complicated processing, and an image display apparatus using the digital broadcast receiving apparatus. .

  In order to achieve the above object, a digital broadcast receiving apparatus according to the present invention generates display image data including at least one of a moving image, graphics, and a still image based on received data from a digital broadcast. An output digital broadcast receiving apparatus that performs adjustment processing that is at least one of enlargement, reduction, and equal magnification processing on at least one of the moving image, graphics, and still image; A detection unit that detects whether or not the display image includes graphics or a still image; and when the detection unit detects that the display image includes graphics or a still image, the image adjustment processing unit And a process switching unit that changes the contents of the adjustment process.

  Note that “graphics” means an image including characters, graphics, and the like, such as an OSD image. According to the digital broadcast receiving apparatus having the above configuration, when the detection unit detects that the display image includes graphics or a still image, the process switching unit changes the content of the adjustment process performed by the image adjustment processing unit. By doing so, it is possible to prevent screen burn-in without changing the display position and display size. As a result, it is possible to provide a digital broadcast receiving apparatus that can prevent image burn-in on the screen of the image display apparatus without missing information contained in the video as much as possible and without performing complicated processing.

  In the digital broadcast receiving apparatus according to the present invention, the image adjustment processing unit performs any one of enlargement, reduction, and equal magnification processing in a horizontal direction on at least one of the moving image, graphics, and still image. A horizontal filter unit to be performed and a vertical filter unit to perform any of enlargement, reduction, and equal magnification processing in the vertical direction, and the detection unit detects that the display image includes graphics or a still image In addition, it is preferable that the processing switching unit changes the barycentric position of the pixel by changing the filter coefficient of at least one of the horizontal filter unit and the vertical filter unit, or the number of filter taps.

  According to the digital broadcast receiving apparatus having the above configuration, screen burn-in can be prevented without changing the display position or the display size. As a result, it is possible to provide a digital broadcast receiving apparatus that can prevent image burn-in on the screen of the image display apparatus without missing information contained in the video as much as possible and without performing complicated processing.

  The digital broadcast receiving apparatus according to the present invention further includes a display control unit that controls display switching between a normal broadcast and a broadcast including graphics or a still image, and the detection unit switches the display by the display control unit. Information is preferably used to detect whether the displayed image includes graphics or still images.

  According to this configuration, since the display control unit controls display switching between normal television broadcasting and data broadcasting including OSD images and still images, display switching information by the display control unit is used. Thus, it is possible to prevent screen burn-in without performing a complicated process for detecting a still image from a display image as in the prior art.

  In the digital broadcast receiving apparatus according to the present invention, the image adjustment processing unit performs a moving image adjustment processing unit that performs adjustment processing that is at least one of enlargement, reduction, and equal magnification processing on the moving image, and graphics. A graphics adjustment processing unit that performs adjustment processing that is at least one of enlargement, reduction, and equal magnification processing, and adjustment processing that is at least one of enlargement, reduction, and equal magnification processing for a still image. A still image adjustment processing unit to perform, and when the detection unit detects that the display image includes graphics or a still image, the processing switching unit includes a graphics adjustment processing unit of the image adjustment processing unit or It is preferable to change the contents of the adjustment processing by the still image adjustment processing unit.

  According to this configuration, it is possible to prevent burn-in only on a plane other than the moving image from among a plurality of planes such as a moving image, graphics, and a still image, and therefore, there is an advantage that there is no influence on the moving image.

  An image display apparatus according to the present invention includes the digital broadcast receiving apparatus according to any one of the above-described configurations, and a display that displays an image output from the digital broadcast receiving apparatus. It can be implemented as a display device or the like.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration example of a digital broadcast receiving apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing in detail the internal configuration of the OSD filter unit shown in FIG. FIG. 3 is a block diagram showing in detail the internal configuration of the still image filter unit shown in FIG.

  As shown in FIG. 1, the digital broadcast receiving apparatus 100 according to the present embodiment includes an antenna 101, a tuner 102, an AV decoder 103, a moving image filter unit 104, an OSD processing unit 105, an OSD filter unit 106, a still image processing unit 107, A still image filter unit 108, a video composition unit 109, a video format conversion unit 110, a host CPU 111, and a frame memory 113 are provided. The host CPU 111 includes a filter switching control unit 112 and a timer 114.

  The antenna 101 receives radio waves of digital broadcasting. The tuner 102 receives the IF signal received by the antenna 101, performs demodulation processing and the like, and outputs the obtained transport stream TS to the AV decoder 103.

  The AV decoder 103 decodes the transport stream TS and outputs the digital video signal VDIN to the moving image filter unit 104. The frame memory 113 stores moving image, OSD, and still image data in field units or frame units.

  In the frame memory 113, a moving image data storage area, an OSD data storage area, and a still image data storage area are allocated separately. The moving image data is written into the frame memory 113 every time the AV decoder 103 completes the decoding process for one field with respect to the input transport stream. For example, in the case of the MPEG standard, since the decoding order and the display order are different, it is necessary to hold a plurality of frames in the frame memory 113. As for still images and OSDs, for example, when a user selects data broadcasting by an operation of a remote controller or the like, the host CPU 111 receives an instruction of this operation and interprets a BML (Broadcast Markup Language) file. The still image data and the OSD data are configured and written to the frame memory. The BML file is stored in a working memory or the like (not shown) inside the digital broadcast receiving apparatus 100.

  The moving image filter unit 104 enlarges or reduces the digital video signal VDIN output from the AV decoder 103 to a video having a predetermined size defined by the data broadcasting standard.

  The OSD processing unit 105 generates a predetermined character graphic defined by the data broadcasting standard based on the data stored in the frame memory 113. The OSD filter unit 106 enlarges or reduces the output of the OSD processing unit 105 to a character graphic having a predetermined size defined by the data broadcasting standard. Based on the data stored in the frame memory 113, the still image processing unit 107 generates and outputs a still image STILL that matches the resolution of the video format defined by the data broadcasting standard. For example, BS / CS digital broadcasting is broadcast in four types of video formats: 1080i, 720p, 480p, and 480i. 1080i has a resolution of 1080 × 1920 and performs interlaced scanning. 720p has a resolution of 720 × 1280, and sequentially scans. 480p has a resolution of 480 × 720 and performs interlaced scanning. 480i has a resolution of 480 × 720, and sequentially scans. Since the OSD and the still image also need to be generated as an image in accordance with these resolutions and combined with the video, the OSD filter unit 106 and the still image processing unit 107 can perform the OSD and still image processing according to the video format standard. Adjust the size.

  The still image filter unit 108 converts, for example, a still image in a 4: 2: 0 format format specified by MPEG into a 4: 2: 2 format format and outputs the converted still image.

  The video synthesis unit 109 performs α synthesis on the video output from the moving image filter unit 104 and the OSD image output from the OSD filter unit 106 according to an α value (composite value) included in the OSD image data, and then Then, the image is synthesized with the still image output from the still image filter unit 108 and output as a synthesized video BLEND.

  The video format conversion unit 110 converts the composite video BLEND output from the video synthesis unit 109 into a digital video signal having a predetermined resolution according to the specifications of the display device connected to the main video output.

  The host CPU 111 performs control such as switching between normal broadcasting and data broadcasting in accordance with an input operation from the user. The filter switching control unit 112 performs processing for switching filters used in the OSD filter unit 106 and the still image filter unit 108.

  Next, the configuration and operation of the OSD filter unit 106 will be described with reference to FIG.

  As illustrated in FIG. 2, the OSD filter unit 106 includes a horizontal filter unit 201, a vertical filter unit 202, a horizontal filter coefficient generation unit 203, and a vertical filter coefficient generation unit 204.

  In the following description, the filtering process for the OSD data is performed in the order of the horizontal direction and the vertical direction, but the order of the filtering process for the OSD data may be reversed.

  The horizontal filter unit 201 performs horizontal filtering using the horizontal filter coefficient HCOEF generated by the horizontal filter coefficient generation unit 203 in order to match the number of pixels of OSD data to the number of pixels of video data. The OSD data OSDH filtered by the horizontal filter unit 201 is sent to the vertical filter unit 202.

  The vertical filter unit 202 receives the output of the horizontal filter unit 201 and uses the vertical filter coefficient VCOEF generated by the vertical filter coefficient generation unit 204 in order to match the number of pixels of the OSD data with the number of pixels of the video data. Perform vertical filtering.

  Each of the horizontal filter coefficient generation unit 203 and the vertical filter coefficient generation unit 204 determines the horizontal filter coefficient HCOEF and the vertical filter coefficient based on the format of the video to be displayed and the resolution of the OSD data stored on the frame memory 113. VCOEF is determined.

  The resolution of OSD data is determined by the data broadcasting operation regulations of BS / CS digital broadcasting. For example, in the case of HDTV format (1080i, 720p), 960 pixels × 540 lines, in the case of SDTV format (480i, 480p) 720 pixels × 480 lines.

  For example, when the video to be displayed is 1080i, the horizontal filter unit 201 and the vertical filter unit 202 perform enlargement processing to 1920 pixels × 1080 lines on the 960 pixel × 540 line OSD data stored on the frame memory 113. After that, the video composition unit 109 synthesizes it with 1080i video data and outputs it. In the present embodiment, in the case of 1080i, the OSD data is double-expanded in the vertical direction by performing a repeat process (swing twice) that repeatedly outputs the same pixel. However, the image enlargement process is not limited to this.

  Next, the operation and configuration of the still image filter unit 108 will be described with reference to FIG. As shown in FIG. 3, the still image filter unit 108 includes a STILL vertical filter unit 301 and a STILL vertical filter coefficient generation unit 302. In general, in a digital broadcast receiving apparatus, since still image filtering is only vertical center-of-gravity position correction, in this embodiment, a configuration having only a vertical filter is used as a specific example of the still image filter unit. Indicated.

  Still image data is stored in the frame memory 113 in the HDTV format (1080i, 720p) and 1920 pixels × 1080 lines, and in the SDTV format (480i, 480p), 720 pixels × 480 lines. For example, when the video to be displayed is 1080i, the still image data is subjected to the gravity center position correction from the 4: 2: 0 format to the 4: 2: 2 format by the STILL vertical filter unit 301, and then the video synthesis unit 109. Are combined with 1080i video data and output.

  Next, an operation example for preventing burn-in in the video signal processing apparatus according to this embodiment will be described. FIG. 4 shows an example of the filter coefficient switching procedure of the vertical filter unit 202 of the OSD filter unit 106 and the STILL vertical filter unit 301 of the still image filter unit 108 in the present embodiment. 5 and 6 schematically show switching of the filter processing at this time. Since the switching of the coefficients of the horizontal filter is the same as that of the vertical filter, the description thereof is omitted.

  In a digital broadcast receiving apparatus, the host CPU 111 generally controls switching between normal broadcasting and data broadcasting, and can detect switching between normal broadcasting and data broadcasting without adding special processing. That is, the digital broadcast receiving apparatus 100 stores data broadcast data of the selected channel in an internal work memory or the like (not shown). When the channel is changed or when the contents of the data carousel from the broadcasting station are changed, the host CPU 111 detects the change and holds the updated portion in the new data carousel in the working memory. Specifically, the host CPU 111 switches from normal broadcasting to data broadcasting according to the following procedure.

  When a user selects a data broadcast by an operation using a remote controller or the like during viewing of a normal broadcast, the host CPU 111 receives an instruction for this operation and reads and interprets the BML file stored in the work memory. Next, the host CPU 111 configures data broadcast screen data based on the BML file and writes it to the frame memory 113. Further, the host CPU 111 sends an instruction to turn on the display of the data broadcast to the video composition unit 109 and the video format conversion unit 110. Thereby, switching from normal broadcasting to data broadcasting is performed.

  When the display of data broadcasting is started (the result of step S1 in FIG. 4 is NO), the host CPU 111 outputs a count start signal START to the timer 114, whereby the timer 114 starts counting. The timer 114 turns on a filter switching flag (“FLAG” in the figure) to be output to the filter switching control unit 112 when a predetermined time has elapsed from the start of counting (the result of step S2 is YES).

  When the filter switching control unit 112 receives an on-state filter switching flag (FLAG) from the timer 114, the filter switching control unit 112 sends filter coefficient switching requests HCH and VCH to the horizontal filter coefficient generation unit 203 and the vertical filter coefficient generation unit 204. Output. Similarly, the filter switching control unit 112 outputs a filter coefficient switching request SVCH to the STILL vertical filter coefficient generation unit 302 (step S3).

  When receiving the filter coefficient switching request HCH from the filter switching control unit 112, the horizontal filter coefficient generation unit 203 of the OSD filter unit 106 changes the enlargement processing method performed by the horizontal filter unit 201 from repeat processing to filter processing (or filter processing). Filter coefficients to change (from to repeat processing). Similarly, when the vertical filter coefficient generation unit 204 receives the filter coefficient replacement request VCH from the filter switching control unit 112, the vertical filter unit 202 performs the enlargement processing method from repeat processing to filter processing (or from filter processing to repeat processing). F) Generate filter coefficients to change.

  Hereinafter, a specific example of switching from the repeat process to the filter process will be described with reference to FIGS. 5 and 6. FIG. 5 is a diagram illustrating an example of vertical pixel double processing. FIG. 5A is a diagram illustrating a vertical repeat process for the pixel luminance signal, and FIG. 5B is a diagram illustrating a vertical filter process for the pixel luminance signal. is there.

  In FIG. 5A and FIG. 5B, A1, A2, A3, and A4 indicate pixels before repeat processing or filter processing, and B1, B2, B3,..., B8 indicate repeat processing. Or the pixel after performing a filter process is shown. In this example, a 2-tap filter in the vertical direction is used, and the number attached to the arrow in the figure indicates the value of the filter coefficient.

As shown in FIG. 5A, in the case of repeat processing, the pixel B1 in the first line is
B1 = A1 × 1 + A2 × 0 = A1
Thus, the pixel A1 before processing is output as it is. Similarly, the pixel A1 is output as it is for the pixel B2 on the second line. For the pixels B3, B4,... In the subsequent lines, the number of lines becomes twice that of the original image by repeating the same process.

In the case of the filter processing shown in FIG. 5B, the pixel B2 in the second line is
B2 = A1 × 3/4 + A2 × 1/4
The pixel B3 on the third line is
B3 = A1 × 1/4 + A2 × 3/4
It becomes. For the pixels B4, B5,... In the subsequent lines, the number of lines becomes twice that of the original image by repeating the same process.

  The switching from the repeat process as shown in FIG. 5A to the filter process as shown in FIG. 5B, or vice versa, the switching from the filter process to the repeat process is performed by changing the configuration of the filter in the vertical filter unit 202. This can be realized by replacing only the filter coefficients without changing them. The value of the filter coefficient is stored in advance in the internal memory of the horizontal filter coefficient generation unit 203 and the vertical filter coefficient generation unit 204 according to the content of the desired filter processing. In the above specific example, an example of a 2-tap filter is shown, but any number of taps may be used.

  FIG. 6 is a diagram illustrating an example of the pixel double processing in the horizontal direction. 6A is a diagram showing a horizontal repeat process for the luminance signal of the pixel, and FIG. 6B is a diagram showing a horizontal filter process for the luminance signal of the pixel. is there.

  The calculation contents of the repeat process shown in FIG. 6A and the filter process shown in FIG. 6B are the same as those in the vertical direction, and a description thereof will be omitted. Regarding horizontal processing, switching from repeat processing to filter processing, or conversely, switching from filter processing to repeat processing is performed by replacing only the filter coefficients without changing the filter configuration in the horizontal filter unit 201. It is feasible.

  Further, when the STILL vertical filter generation unit 302 in the still image filter unit 108 receives the filter coefficient switching request SVCH from the filter switching control unit 112, the center-of-gravity position is changed in the enlargement process performed by the STILL vertical filter unit 301. Then, a filter coefficient SVCOEF is generated (step S4).

  Hereinafter, a specific example of the change in the center of gravity during the enlargement process will be described with reference to FIGS. FIG. 7 is a diagram illustrating an example of vertical doubling processing of pixels, and A1, A2, A3, and A4 indicate pixels before filter processing, and B1, B2, B3,..., B8 Indicates the pixel after the filtering process. In this example, a 2-tap filter in the vertical direction is used as in the previous example, and the number attached to the arrow in the figure indicates the value of the filter coefficient.

In FIG. 7A, the pixel B1 in the second line is
B2 = A1 × 3/4 + A2 × 1/4
The pixel B3 on the third line is
B3 = A1 × 1/4 + A2 × 3/4
It becomes. Thereafter, a double process is realized by repeating these processes.

FIG. 7B is a process when the vertical center of gravity is moved downward by a predetermined offset (OFFSET) with respect to the output pixels B1, B2, B3,... In FIG. . The pixel B2 on the second line is
B2 = A1 × 7/10 + A2 × 3/10
The pixel B3 on the third line is
B3 = A1 × 1/5 + A2 × 4/5
It becomes. That is, the center of gravity position can be moved by appropriately setting the filter coefficient. Thereafter, the same processing is performed for each line, thereby realizing double processing of the resolution in the vertical direction.

  As shown in FIGS. 7A and 7B, the center-of-gravity position moving process can also be realized by changing only the filter coefficients without changing the filter configuration. A plurality of types of filter coefficient values are set in advance according to the amount of movement of the center of gravity, and are stored in the internal memory of the STILL vertical filter generation unit 302 or the like.

  FIG. 8 is a diagram showing an example of changing the center of gravity position in the horizontal direction. The calculation content of the filter process is the same as that in the vertical direction, and the description thereof is omitted. Also in the horizontal direction, as shown in FIGS. 8A and 8B, the center-of-gravity position moving process can be realized by replacing only the filter coefficients without changing the filter configuration.

  Next, the movement of the center of gravity during the reduction process will be described with reference to FIG. Image reduction processing is realized by pixel thinning processing. However, when simple thinning processing is performed on the original pixels, aliasing occurs, and thus low-pass filter processing is generally performed before thinning processing. . However, since this low-pass filter process is not directly related to the present invention, the low-pass filter process is omitted here and only the thinning process is described.

  FIG. 9A and FIG. 9B show pixel thinning processing for realizing the reduction processing, and A1, A2, A3, A4... Are pixels before thinning processing. B1, B2, B3,..., B8 indicate pixels after the thinning process is performed. In this example, thinning processing is performed with a 2-tap horizontal filter.

In FIG. 9A, the first pixel B1 is
B1 = A1 × 1 + A2 × 0 = A1
And the second pixel B2 is
B2 = A3 × 1 + A4 × 0 = A3
It becomes. Thereafter, the same process is repeated for all the pixels in the horizontal direction to perform the thinning process.

FIG. 9B illustrates a thinning process for realizing a reduction process in which the barycentric position of the pixel is moved with respect to FIG. In FIG. 9B, the first pixel B1 is
B1 = A1 × 0 + A2 × 1 = A2
And the second pixel B2 is
B2 = A3 × 0 + A4 × 1 = A4
It becomes. Thereafter, the same process is repeated for all the pixels in the horizontal direction to perform the thinning process.

  As described above, the movement of the barycentric position in the thinning process as shown in FIGS. 9A and 9B can be realized by changing only the filter coefficient without changing the configuration of the filter. The principle for the vertical reduction process is also the same, and the description is omitted.

  If it is determined in step S1 in FIG. 4 that a normal television broadcast is being displayed (YES in step S1), the enlargement processing method in the horizontal filter unit 201 and the vertical filter unit 202 is repeated. The process is set (step S5), the gravity center position of the still image is returned to a predetermined initial state (step S6), and the process returns to step S1.

  In the present embodiment, the OSD filter unit is arranged so that the center of gravity position of the image changes with the same magnification processing with respect to the OSD data and the still image data when a certain time has elapsed after the display of the data broadcast is started. The filter coefficients are switched for the vertical filters 106 and the still image filter unit 108. Since only the barycentric position of the pixel is changed without changing the enlargement / reduction magnification or the display position, the information of the original image is not easily lost.

  In this embodiment, for the purpose of preventing burn-in, the example in which the filter coefficient for OSD data is switched from the repeat process to the filter process has been shown, but conversely, the filter coefficient is changed from the filter process to the repeat process. You may switch. The OSD data is also subjected to arbitrary filter processing until the still image display detection flag FLAG is turned on, and the center of gravity position of the filter processing is changed after the still image display detection flag FLAG is turned on. In addition, the filter coefficient may be changed.

  The digital broadcast receiving apparatus according to the present embodiment can prevent screen burn-in without changing the display position, display size, and enlargement / reduction ratio as in the conventional method. In particular, in a device that synthesizes a moving image, OSD, and still image such as a digital broadcast receiver, the burn-in prevention process is performed only on the OSD and still image, so that there is no influence on the moving image. Further, when the host CPU controls the state transition of moving image display and still image display, processing for detecting a still image from the video is not necessary.

It is a block diagram which shows the structure of the image display apparatus which concerns on one Embodiment of this invention. FIG. 2 is a block diagram showing in detail a part of FIG. 1 (OSD filter, host CPU). FIG. 3 is a block diagram showing in detail a part of FIG. 2 (still image filter, host CPU). It is a flowchart which shows the flow of a process of the image display apparatus which concerns on one Embodiment of this invention. It is a figure which shows the operation example of the vertical expansion filter which concerns on one Embodiment of this invention. It is a figure which shows the operation example of the horizontal expansion filter which concerns on one Embodiment of this invention. It is a figure which shows the operation example of the vertical expansion filter which concerns on one Embodiment of this invention. It is a figure which shows the operation example of the horizontal expansion filter which concerns on one Embodiment of this invention. It is a figure which shows the operation example of the horizontal reduction filter which concerns on one Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Digital broadcast receiver 101 Antenna 102 Tuner part 103 AV decoder 104 Movie filter 105 OSD part 106 OSD filter 107 Still picture part 108 Still picture filter 109 Video composition part 110 Video format conversion part 111 Host CPU
112 Filter switching control unit 113 Frame memory 114 Timer 201 Horizontal filter 202 Vertical filter 203 Horizontal filter coefficient generation unit 204 Vertical filter coefficient generation unit 301 STILL vertical filter 302 STILL vertical filter coefficient generation unit

Claims (5)

A digital broadcast receiving apparatus that generates and outputs display image data including at least one of moving images, graphics, and still images based on received data from digital broadcasting,
An image adjustment processing unit that performs an adjustment process that is at least one of enlargement, reduction, and equal magnification processing on at least one of the moving image, graphics, and still image;
A detection unit for detecting whether the display image includes graphics or a still image;
A digital broadcast, comprising: a process switching unit that changes the contents of the adjustment process performed by the image adjustment processing unit when the detection unit detects that the display image includes graphics or a still image. Receiver device. The image adjustment processing unit, with respect to at least one of the moving image, graphics, and still image, a horizontal filter unit that performs any of enlargement, reduction, and equal magnification processing in the horizontal direction, and a vertical direction, A vertical filter unit that performs any of enlargement, reduction, and equal magnification processing,
When the detection unit detects that the display image includes graphics or a still image, the processing switching unit changes the filter coefficient of at least one of the horizontal filter unit and the vertical filter unit, or the number of taps of the filter. The digital broadcast receiving apparatus according to claim 1, wherein the barycentric position of the pixel is changed. It further includes a display control unit that controls switching between normal broadcasting and broadcasting including graphics or still images,
The digital broadcast receiving apparatus according to claim 1, wherein the detection unit detects whether the display image includes graphics or a still image using switching information from the display control unit. The image adjustment processing unit
A video adjustment processing unit that performs adjustment processing that is at least one of enlargement, reduction, and equal magnification processing on the video;
A graphics adjustment processing unit that performs adjustment processing that is at least one of enlargement, reduction, and equal magnification processing on graphics;
A still image adjustment processing unit that performs adjustment processing that is at least one of enlargement, reduction, and equal magnification processing on the still image,
When the detection unit detects that the display image includes graphics or a still image, the processing switching unit performs the adjustment processing by the graphics adjustment processing unit or the still image adjustment processing unit of the image adjustment processing unit. The digital broadcast receiving apparatus according to any one of claims 1 to 3, wherein the content is changed.   An image display device comprising: the digital broadcast receiving device according to claim 1; and a display for displaying an image output from the digital broadcast receiving device.

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