JP2016134682A - Reference signal pattern and reference signal generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reference signal pattern capable of visually confirming which video parameters are used by a video apparatus, in an ultra-high definition television video system.SOLUTION: A reference signal pattern for use in an ultra-high definition television (UHDTV) video system has a first region not included in a colorimetric system defined by BT.709 gamut, and having a first color included in a wide color gamut colorimetric system defined by BT.2020, or has a lamp pattern where the luminance increases at a rate of 1 gray scale per 1 pixel in a video of 12 bit gray scale, or has a region where a region of horizontal stripe structure of 1 pixel wide, a vertical stripe structure of 1 pixel wide, and white lines and block lines draw a spiral shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a reference signal pattern and a reference signal generator used in a broadcasting system.

  In a broadcasting system, a plurality of devices are connected to each other, signal transmission and signal processing are performed, and a reference signal is used to check a signal connection state between the devices. Professional equipment used in broadcasting can generate a reference signal and is used in a connection test with a subsequent equipment.

  FIG. 10 shows an example of a high-vision reference signal (Non-Patent Document 1). The reference signal pattern 500 shown in FIG. 10 mainly includes four patterns 501 to 504. In the upper area occupying 7/12 in the vertical direction, both achromatic signals (40% gray) are present on the outer side, and the left side is the inner side. A pattern 501 is provided in which seven strip-shaped 75% color bars of white, yellow, cyan, green, magenta, red, and blue are arranged. The next pattern 502 is composed of a chroma adjustment signal for the monitor and the like, and cyan and blue signals outside it, and the next pattern 503 is composed of a ramp signal and yellow and red signals outside it. The bottom pattern 504 is composed of a monitor black level luminance setting signal and the like.

  This reference signal is usually referred to as a “color bar signal” and is used for a connection test between the signals of devices and for brightness adjustment and color adjustment of a video monitor.

  In recent years, research and development of ultra-high-definition systems with higher resolution than Hi-Vision such as Super Hi-Vision have been promoted. Video parameters of an Ultra High Definition Television (UHDTV) video system including Super Hi-Vision are established as a domestic standard (Non-patent Document 2). In the present specification, the “ultra-high definition television” means a television having a definition defined in the above domestic standard (Non-patent Document 2).

  Compared with conventional high-definition broadcasting, ultra-high-definition television has a high-definition horizontal 7680 × vertical 4320 (so-called 8K) or horizontal 3840 × vertical 2160 (so-called 4K) pixels, ITU-R BT. A color system having a wide color gamut defined by 2020 (wide color gamut color system) is employed. The number of bits of each pixel is two types of 10 bits or 12 bits, and the sampling structure is R′G′B′4: 4: 4 format, Y′Cb′Cr′4: 4: 4 format, Y ′ A plurality of formats such as Cb′Cr′4: 2: 2 format and Y′Cb′Cr′4: 2: 0 format are standardized. In addition, there is a case where an ultra-high definition video is obtained by demosaicing a video signal having a Bayer array (Non-patent Document 3).

  There is a need for a reference signal compatible with such ultra-high definition television.

"Multi-format color bar standard" ARIB STD-B28, Japan Radio Industry Association, December 14, 2000 "Ultra-high-definition television system standard standard" ARIB STD-B56, General Electric Association, Radio Industry Association, March 19, 2013 Zhang L, Wu X., "Color demosaicking via directional linear minimum mean square-error estimation.", IEEE Trans Image Process., 2005 Dec, 14 (12), pp.2167-78

  Ultra-high-definition television system video systems are generally configured by connecting multiple video devices, but in order to construct an appropriate video system, which video parameters each video device uses It is desirable that it can be easily confirmed on a monitor.

  However, even if the reference signal (color bar signal) shown in FIG. 10 used in the current high-definition is applied to ultra-high-definition video such as Super Hi-Vision with the number of pixels quadrupled vertically and horizontally, It is difficult to visually check whether parameters are used.

  Accordingly, an object of the present invention made in view of the above problems is to allow visual confirmation of brightness adjustment and color adjustment of an image monitor in a video system of an ultra-high definition television system, and to provide video equipment. It is an object of the present invention to provide a reference signal pattern and a reference signal generator that can visually confirm which video parameter is used.

  In order to solve the above problems, a reference signal pattern according to the present invention is a reference signal pattern used in an ultra high definition television (UHDTV) video system, and a video parameter of a video device that performs signal processing is: BT. It is characterized by having a pattern whose color or structure changes when it does not meet the criteria of the wide color gamut color system, 2020, or 4: 4: 4 sampling system defined in 2020.

  In addition, the reference signal pattern is an ITU-R BT. BT.709 and not included in the color system defined by 709. A first region having a first color included in the wide color gamut color system defined by 2020, and adjacent to the first region and having the same color as the first color. It is desirable to have a second region of the second color included in the color system defined by 709.

  The reference signal pattern preferably has a ramp pattern in which luminance increases at a rate of one gradation per pixel in a 12-bit gradation image.

  The reference signal pattern includes a horizontal stripe structure region in which horizontal stripes of a third color having a width of 1 pixel and horizontal stripes of a fourth color having a width of 1 pixel are alternately arranged, and a width of 1 pixel. It is desirable to provide a vertical stripe structure region in which vertical stripes of the third color and vertical stripes of the fourth color having a width of one pixel are alternately arranged.

  In the reference signal pattern, it is preferable that the third color is magenta and the fourth color is white.

  In the reference signal pattern, a white line refracted at a plurality of positions with a width of one pixel and a black line refracted at a plurality of positions with a width of one pixel are adjacent to each other, and a false color is generated by demosaicing. It is desirable to have a pattern.

  The reference signal pattern preferably includes a region in which the white line and the black line draw a spiral shape.

  The reference signal pattern preferably has a structure pattern area that cannot be displayed at least at a resolution of horizontal 3840 pixels × vertical 2160 pixels.

  In order to solve the above problems, a reference signal generator according to the present invention generates the reference signal pattern.

  By using the reference signal pattern and the reference signal generation device of the present invention, in the video system of the ultra-high definition television system, which video parameter is used by the video equipment, and what video parameter is converted by the video It can be visually discriminated on the image monitor whether or not it has been generated through the above.

It is an example of the reference signal pattern of this invention. It is an example of the video system which connected the video equipment from which a video parameter differs. It is a figure explaining color gamut conversion. It is an example of a reference signal pattern via a high vision color gamut. It is an example of the ramp waveform of the reference signal pattern of the present invention. It is an example of the 8K pattern of the reference signal pattern of the present invention. It is an example of the reference signal pattern which passed through color difference interpolation or demosaic. It is an example of the 4K pattern of the reference signal pattern of the present invention. 1 is a conceptual diagram of a reference signal generator and video equipment according to the present invention. It is an example of the reference signal pattern of a high vision.

  Embodiments of the present invention will be described below.

(Embodiment 1)
FIG. 1 shows an example of a reference signal pattern 100 according to the first embodiment of the present invention. The actual reference signal pattern 100 is a color pattern.

  Here, a reference signal pattern 100 corresponding to a super high-definition resolution moving image (8K resolution: horizontal 7680 pixels × vertical 4320 pixels) is used as an example of an ultra-high definition video. In the case of a 4K resolution moving image, sub-sampling is performed every 2 pixels in the vertical and horizontal directions in FIG. However, an 8K pattern 122 and a 4K pattern 132 described later will be described separately.

  The reference signal pattern 100 in this embodiment is composed of areas 101 to 132.

  The numerical values written around the reference signal pattern 100 in FIG. 1 are the number of pixels indicating the width and length of each area. However, this number of pixels is one example, and the width and length of each area can be adjusted as needed.

  Table 1 shows the color of each area and the pixel value (output gradation) of the video signal (R ′, G ′, B ′).

  The numerical values in each column of Table 1 are pixel values when each pixel is shown in a 12-bit system, and the numerical values in parentheses are for 10 bits. Regarding the relationship between the signal level of the video signals R ′, G ′, and B ′ and the pixel value (output gradation: quantization level), 100% is 3760 (940), and 0% is 256 (64). In addition, the pixel value of each area is an example, Comprising: It is not limited to this numerical value.

  The pixel values in Table 1 are selected in consideration of the ease of conversion to 8 bits. For example, the areas 102 to 108 do not strictly display the 75% signal level.

  FIG. 2 is a diagram illustrating a video system in which a plurality of video devices having different video parameters are connected.

  In FIG. 2, the 8K device 10 is BT. Wide-gamut color system defined by 2020, 12-bit video, video equipment that performs signal processing with video parameters of a 4: 4: 4 system sampling system (this may be referred to as “full-spec SHV” video equipment) The image monitor 11 also has a display function corresponding to the output video of the 8K device 10. Here, if an image parameter device that does not satisfy the standard of the full spec SHV is interposed between the 8K device 10 and the image monitor 11, the image quality on the image monitor 11 deteriorates.

  For example, as shown in FIG. When the signal of the 8K device 10 in the wide color gamut color system defined by 2020 is connected via the device 21 that can only process the conventional high vision color gamut (BT.709 color gamut), Even if converted to the fine video system color gamut (BT.2020 color gamut), when displayed on the 8K compatible monitor 11, the color output from the original 8K device 10 may be lost.

  Further, as shown in FIG. 2B, when the signal of the 8K device 10 corresponding to 12-bit video is connected via the device 31 that can process only 10-bit video, the data for 2 bits is converted to 10 bits. Even if the image is lost and re-converted to 12-bit video by the subsequent device 32, it may not be displayed as a high gradation image output from the original 8K device 10 when displayed on the 8K compatible monitor 11.

  Further, as shown in FIG. 2C, the signal of the 8K device 10 whose sampling structure is compatible with the 4: 4: 4 method is connected via the device 41 of the 4: 2: 2 method or the 4: 2: 0 method. In this case, part of the color difference information is lost due to the system conversion, and even if the device 42 subsequently converts the image back to the 4: 4: 4 system image, the original 8K is displayed when displayed on the 8K compatible monitor 11. The high-definition image and color output from the device 10 may change.

  Further, as shown in FIG. 2D, when the signal of the 8K device 10 corresponding to the image in which all pixels have the three primary colors is connected through the device 51 subjected to Bayer conversion, demosaic conversion is performed by the subsequent device 52. However, when displayed on the 8K-compatible monitor 11, the high-definition image or color output from the original 8K device 10 may change.

  In the reference signal pattern 100 of the present invention, at least one of video parameters of a video device that performs signal processing is a predetermined reference (wide color gamut color system defined by BT.2020, 12-bit video, 4: 4: 4 system). When the sampling system is not satisfied, the color or shape of the pattern changes.

  Therefore, when the reference signal pattern 100 is generated from the 8K device 10 and then the reference signal pattern is displayed on the 8K compatible monitor 11, it is possible to visually grasp what video parameter conversion path the signal has passed. .

  Hereinafter, the relationship between the reference signal pattern 100 and the video parameters will be described.

(Detection of color gamut conversion)
In FIG. 1, the areas 101 to 109 and 110 to 113 of the reference signal pattern 100 are the same as the reference signal pattern for high vision. That is, areas 101 and 109 of achromatic signal (40% gray) are arranged on both outer sides, and areas 102 to 108 are arranged on the inner side, and white, yellow, cyan, green, magenta, red, and blue 7 from the left. There are 75% color bars made up of strips of books. Areas 110 to 113 are 100% cyan, yellow, blue, and red patterns. The pure colors in these areas 103 to 108 and 110 to 113 are colors that cannot be displayed in the color gamut (BT.709 color gamut) of conventional high-vision devices. Although seven color bars having different colors are used here, it is not essential to arrange all these colors in this order, and they can be selected as appropriate.

  The reference signal pattern 100 of the present embodiment further includes BT. Adjacent to the color bars of the wide color gamut color system areas 103 to 108 defined by 2020, areas 115 to 120, which are regions of similar colors, are arranged. Areas 115 to 120 are patterns of yellow, cyan, green, magenta, red, and blue, respectively, in the color gamut (BT.709 color gamut) of a conventional high-vision device. Areas 102 and 114 are 75% white and completely the same color.

  As already described, the video system of the ultra-high definition television system has a color system with a wider color gamut (wide color gamut color system defined by BT.2020) compared to conventional high-definition broadcasting. Adopted. Therefore, as shown in FIG. 2A, in order to use the color gamut (BT.709 color gamut) system of the conventional high-vision device, it is necessary to perform color gamut conversion. BT. When the signal converted to the 709 color gamut is used in the wide color gamut system, the color gamut needs to be converted again to the wide color gamut.

  In FIG. 2020 color gamut 210 and BT. 709 shows the relationship with the 709 color gamut 220.

  In FIG. 3, a spectrum locus 200 is a curve on the chromaticity diagram that represents all the colors with different wavelengths of monochromatic visible light. BT. The 2020 color gamut 210 uses the three primary colors of red, green, and blue as the colors on the spectrum locus 200, can display colors in a wide color gamut, and is a BT. All of the 709 color gamut 220 is included.

  BT. The color expressed in the 2020 color gamut is changed to BT. Many methods for converting to the 709 color gamut have been devised, but the basic concept is BT. The color of a wide color gamut outside the 709 color gamut is pushed into a narrow color gamut (BT.709 color gamut). Many of those in the 709 color gamut use the method of rearrangement as they are. Conversely, BT. From the 709 color gamut, BT. There are many cases where the conversion to the 2020 color gamut does not extend the color gamut but assigns it as it is.

  Therefore, BT. The colors of the area 113 to the area 118 and the area 115 to the area 120, which are the colors of the wide color gamut color system defined by 2020, change once they are converted to the high vision color gamut (BT.709 color gamut). BT. Even if re-conversion to the wide color gamut color system defined by 2020 is performed, the original color is not restored.

  4 shows a changed pattern 100 ′ after color gamut conversion to the color gamut (BT.709 color gamut) of the conventional high-vision device with respect to the reference signal pattern 100 of FIG.

  BT. BT.709 outside the color gamut. The color of the area 230 (area 103 to area 108) of the block 1 which is a color of the 2020 color gamut is once changed to BT. Since it is pushed back into the 709 color gamut and does not return to its original state, the vividness of the color is lost. On the other hand, the color of the area 240 (area 115 to area 120) of the block 2 is originally BT. Since it is a color in the 709 color gamut, it hardly changes. As a result, the colors of the block 230 area 230 and the block 2 area 240 are substantially the same.

  The reference signal pattern 100 of the present invention cannot be displayed in the color gamut (BT.709 color gamut) of a conventional high-vision device. A wide color gamut color system color area (areas 103 to 108, 110 to 113) defined in 2020 is provided, and whether the vividness of the color has changed or not has passed through the high vision color gamut. Can be confirmed visually.

  In particular, in this embodiment, BT. Adjacent to the area 230 (area 103 to area 108) of the block 1 which is a color of the 2020 color gamut, BT. Since the block 240 area 240 (area 115 to area 120), which is the color of the 709 color gamut, is provided, whether the color of the block 230 area 230 has changed is determined with good visibility by comparing both colors. Can do.

  As described above, the reference signal pattern 100 of the present invention can easily identify whether an image has passed through the high vision color gamut (BT.709 color gamut).

(Detection of bit number conversion)
An area 121 of the reference signal pattern 100 is an example of a ramp (Ramp) signal for checking bit dropping. The ramp signal is a luminance signal from 0% to 100%.

  FIG. 5 shows the setting of an 8K resolution ramp waveform.

  In the 12-bit system, the pixel value of 0% signal level is 256 and the pixel value of 100% signal level is 3760, so there are 3504 pixel values in between. Therefore, in the present embodiment, among the area 121 of 5760 pixels in the horizontal direction, the left 1128 pixel region has a pixel value 256 (0% black) and the right 1128 pixel region has a pixel value 3760 (100% white). , An area of 3504 pixels is set so that the value increases by 1 for each pixel in the horizontal direction. In each pixel, the video signals R ′, G ′, and B ′ are all set to the same pixel value.

  As described above, when a signal corresponding to 12-bit video is connected to a device corresponding to 10-bit video (FIG. 2 (b)), information of 2 bits is deleted, and then to 12-bit video. Even if re-conversion is performed, generally lost information of 2 bits cannot be restored.

  In the 10-bit system, the pixel value of 0% signal level is 64 and the pixel value of 100% signal level is 940, so the pixel value between them is 876 steps. Therefore, when the ramp waveform of FIG. 5 is displayed in a 10-bit system, the value increases by 1 every 4 pixels in the horizontal direction. This shows the difference between the 12-bit system and the 10-bit system. Also, when a 12-bit system is converted back to a 12-bit system via a 10-bit system, the value increases by 1 every 4 pixels in the horizontal direction.

  In this way, the reference signal pattern 100 of the present invention can easily identify whether the parameter of the video equipment is a 10-bit or 12-bit signal, or whether the video has passed through a 10-bit video.

  In FIG. 5, the 8K resolution ramp waveform has been described, but a ramp waveform corresponding to 4K resolution can be provided adjacent to the area 111, area 121, and area 113 in FIG. 1 (not shown).

  For example, the horizontal length of the area 111 and the area 113 is narrowed to 336 pixels, and the horizontal direction of the area 121 is set to 7008 pixels at 8K resolution. And it is comprised so that a pixel value may increase 1 each at 2 pixels in the horizontal direction. In the case of a 4K resolution moving image, two pixels in the vertical and horizontal directions of the 8K image become one pixel of the 4K image. Therefore, the horizontal 7008 pixel in the 8K resolution becomes 3504 pixels in the 4K resolution. Accordingly, in a 12-bit video, the pixel value is set to increase by 1 for each 4K horizontal pixel. By setting in this way, the design can be made so that the difference between the 12-bit system and the 10-bit system can be understood even at 4K resolution.

(Detection of color difference interpolation or demosaicing)
The area 122 of the reference signal pattern 100 is a pattern for detecting color difference interpolation (sampling method conversion) or demosaicing (conversion from the Bayer array), and in particular, an inspection pattern corresponding to 8K resolution (hereinafter referred to as “8K”). "Pattern") is set. Similarly, the area 132 is a pattern for identifying color difference interpolation or demosaicing, and in particular, an inspection pattern corresponding to 4K resolution (hereinafter also referred to as “4K pattern”) is set.

  In addition, as shown in Table 1, white or a black pattern with a predetermined density is arranged in areas 123 to 131 sandwiched between the areas 122 and 132, and a black level luminance setting signal as a high-definition reference signal. The same thing is set.

  FIG. 6 shows an example of the pattern structure of the area 122. As shown in FIG. 6A, the area 122 includes a magenta horizontal stripe structure pattern (Horizontal magenta stripe) 310, a magenta vertical stripe structure pattern (Vertical magenta stripe) 320, and a cyclone structure pattern. (Cyclone) 330, 100% magenta 340, and 100% white 350. The width of each pattern area shown in FIG. 6 is an example.

  FIG. 6B shows an outline of a horizontal stripe structure pattern 310 (Horizontal magenta stripe) 310 and an enlarged view of adjacent 2 × 2 pixels. The pattern 310 is a vertical direction in which 100% magenta pixels are continuous in the horizontal direction, one vertical pixel is 400 pixels in the horizontal direction, magenta line 311 in the horizontal direction, and 100% white pixels are in the horizontal direction. This is a stripe structure pattern in which horizontal white lines 312 of 1 pixel and 400 pixels in the horizontal direction are alternately arranged.

  FIG. 6C shows an outline of a vertical stripe structure pattern (Vertical magenta stripe) 320 and an enlarged view of adjacent 2 × 2 pixels. The pattern 320 is a horizontal direction in which pixels of 100% magenta continue in the vertical direction, vertical magenta lines 321 of 1 pixel in the horizontal direction and vertical direction of 540 pixels, and pixels of 100% white continue in the vertical direction. This is a stripe structure pattern in which vertical white lines 322 of 1 pixel and 540 pixels in the vertical direction are alternately arranged.

  FIG. 6D shows an outline of the cyclone structure pattern (Cyclone) 330 and an enlarged view of one spiral pattern (10 × 9 pixels). The pattern 330 includes a plurality of lines 331 refracted at a plurality of portions having a width of one pixel, which are formed by 100% white pixels continuously, and a plurality of pixels having a width of 100% black, which are continuously formed by 100% black pixels. A pattern configured such that a line 332 refracted at a part is adjacent and black and white draws a spiral is defined as a unit pattern. In FIG. 6D, a spiral pattern of 10 × 9 pixels is shown as a unit pattern. However, it is not necessary to have an accurate spiral shape, and a combination of irregularly bent white and black lines is combined. Any pattern may be used as long as it is a pattern in which a false color is generated by demosaicing. The unit pattern size may also be an arbitrary n × m pixel pattern. The pattern 330 is configured by repeating this unit pattern vertically and horizontally.

  As will be described later, these patterns 310 to 330 change when color difference interpolation or demosaic conversion is performed. On the other hand, 100% magenta 340 and 100% white 350 are reference colors for confirming the color change of the patterns 310 to 330.

The sizes of the areas of the patterns 310 to 350 can be set as appropriate, and the magenta, white, and black pixel values constituting the pattern are set as follows, for example.
・ Magenta: 100% Magenta R ': 3760 (940) G': 256 (64) B ': 3760 (940)
・ White: 100% White R ': 3760 (940) G': 3760 (940) B ': 3760 (940)
・ Black: 0% Black R ': 256 (64) G': 256 (64) B ': 256 (64)

  The color of the stripe structure pattern is not limited to white and magenta, but white has a large luminance Y and no color difference, while magenta has a large color difference (Cb, Cr). When this is done, there is an advantage that it is easy to sense a change in the color of the pattern.

  FIG. 7 shows a change in pattern when each pattern of FIG. 6 is converted to a 4: 4: 4 sampling structure again through a different sampling method or Bayer conversion.

  In FIG. 7, the leftmost column is an original pattern of the R′G′B′4: 4: 4 system sampling structure and passes through the equipment of the Y′Cb′Cr′4: 4: 4 system. The pattern does not change. When demosaic conversion is performed after Bayer conversion in order from the left side of the next column, when converted to R'G'B'4: 4: 4 method again through Y'Cb'Cr'4: 2: 2 method, Each pattern change when converted to the R′G′B ′ 4: 4: 4 system again through the Y′Cb′Cr ′ 4: 2: 0 system is shown. In each column, the top row is a horizontal stripe structure pattern, the second row is a vertical stripe structure pattern, and the bottom row is a cyclone pattern.

  The horizontal stripe pattern 310 does not change even when the 4: 2: 2 method is used. However, when the 4: 2: 0 system is used, the magenta color is mixed with the white line portion, and the pattern is blurred.

  In the vertical stripe pattern 320, the same pattern change (blurred line pattern color) occurs between the 4: 2: 2 system and the 4: 2: 0 system.

  Therefore, by comparing the horizontal pattern, vertical pattern, and white / magenta, the system passes through the 4: 2: 2 system (when only the vertical pattern changes), and passes through the 4: 2: 0 system (horizontal It is possible to visually determine that the pattern and the vertical pattern are both changed) or that the 4: 4: 4 system is maintained (no pattern change).

  The cyclone structure pattern 330 is used to determine whether or not the Bayer transformation and demosaic transformation are performed. As shown in FIG. 6C, in a pattern in which black and white lines are alternately adjacent and refracted irregularly, it is difficult to restore the color of each pixel from the Bayer array image. In the example shown in FIG. 7, the method of Non-Patent Document 3 is used as the demosaic method, but any demosaic method can be used to make a false color in this cyclone structure pattern, so it is easy to make a visual judgment. is there.

  In addition, since the area 122 uses a 1-pixel structure, the cyclone structure pattern 330 is not accurately reproduced particularly when a device that does not satisfy the 8K resolution is used. Therefore, the area 122 can also be used to identify the resolution of the device. Therefore, this area does not define the signal type as a 4K resolution reference signal.

  FIG. 8 shows an example of the pattern structure of the area 132. As shown in FIG. 8A, the area 132 includes a magenta horizontal stripe structure pattern (Double Horizontal magenta stripe) 410, a magenta vertical stripe structure pattern (Double Vertical magenta stripe) 420, and a cyclone. It is composed of a structure pattern (Double Cyclone) 430, 100% magenta 440, and 100% white 450. This area 132 is also used as a reference for 4K resolution.

  FIG. 8B shows an outline of a horizontal stripe structure pattern 410 (double horizontal magenta stripe) 410 and an enlarged view of the adjacent 4 × 4 pixels. The pattern 410 has a vertical magenta line 411 of 2 pixels in the vertical direction and 400 pixels in the horizontal direction, and 100% white pixels in the horizontal direction. This is a stripe structure pattern in which horizontal white lines 412 of 2 pixels and 400 pixels in the horizontal direction are alternately arranged. Here, the pattern is shown on the premise of 8K (7680 × 4320) pixels, but this area is subsampled every 2 pixels vertically and horizontally as a reference signal pattern of 4K resolution. That is, in a 4K resolution image, this pattern is a horizontal stripe pattern in which magenta lines having a width of one pixel and white lines having a width of one pixel are alternately arranged.

  FIG. 8C shows an outline of a vertical stripe structure pattern (Double Vertical magenta stripe) 420 and an enlarged view of the adjacent 4 × 4 pixels. The pattern 420 has a horizontal magenta line 421 of 2 pixels in the horizontal direction and 540 pixels in the vertical direction, and pixels of 100% magenta in the vertical direction, and a horizontal direction in which pixels of 100% white are continuous in the vertical direction. This is a pattern of a stripe structure in which vertical white lines 422 of 2 pixels and 540 pixels in the vertical direction are alternately arranged. Similar to the pattern 410, this area has a structure in which this area is subsampled every two pixels in the vertical and horizontal directions as a reference signal pattern of 4K resolution. Thus, in a 4K resolution image, this pattern is a vertical stripe pattern in which magenta lines having a width of one pixel and white lines having a width of one pixel are alternately arranged.

  FIG. 8D shows an outline of the cyclone structure pattern (Double Cyclone) 430 and an enlarged view of one spiral pattern (20 × 18 pixels). The pattern 430 includes a line 431 refracted at a plurality of pixels having a width of 2 pixels formed by 100% white pixels, and a line 432 formed by a plurality of portions having a width of 2 pixels formed by 100% black pixels. A unit pattern is a pattern in which black and white draw a spiral with each other. Similar to the patterns 410 and 420, in a 4K resolution image, this pattern is a cyclone pattern in which a magenta line having a width of one pixel and a white line having a width of one pixel are alternately arranged in a spiral pattern. The pattern 430 is configured by repeating this unit pattern vertically and horizontally.

  Each of these patterns 410, 420, and 430 causes the same pattern change as in FIG. 7 depending on the sampling method or the like. Therefore, in the 4K resolution system, whether or not the demosaicing from the Bayer array is passed, or 4: It is possible to visually determine whether the color difference interpolation of 2: 2 method or 4: 2: 0 method is performed.

  Also, if the system is less than 4K resolution, these patterns are not accurately reproduced. Therefore, it can be easily visually determined from this area 132 whether the resolution is 4K or more.

  The reference signal pattern according to the present invention may include at least one of the color bar pattern, the ramp signal pattern, the horizontal and vertical stripe structure pattern, and the cyclone structure pattern described above. As a result, at least BT. Whether any of the wide color gamut color system specified in 2020, 12-bit video, 4: 4: 4 sampling system is satisfied, can be detected by a change in pattern color or structure. .

(Embodiment 2)
A reference signal generator according to Embodiment 2 of the present invention will be described. FIG. 9 is a conceptual diagram of the reference signal generator of the present invention and a broadcasting device using the same.

  The broadcasting device (business device used in broadcasting) 10 is a full-spec SHV 8K device and includes a reference signal generator 90 inside thereof, and can independently generate a reference signal.

  Here, the reference signal generator 90 generates the reference signal pattern 100 described with reference to FIGS. The brightness adjustment / color adjustment of the monitor 11 can be visually confirmed by the generated reference signal. Further, by connecting the video equipments 21 to 52 shown in FIG. 2 to the broadcasting equipment 10 provided with the reference signal generator 90 and displaying the images, parameters (color gamut, bit number, sampling method) of each video equipment are displayed. Etc.) can be visually confirmed. Note that the reference signal generator 90 can add an ID code representing the device 10 to the reference signal for device identification (not shown).

  Although the present invention has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications and corrections based on the present disclosure. Therefore, it should be noted that these variations and modifications are included in the scope of the present invention.

  Although the above embodiment has been described as a representative example, it will be apparent to those skilled in the art that many changes and substitutions can be made within the spirit and scope of the invention. Therefore, the present invention should not be construed as being limited by the above-described embodiments, and various modifications and changes can be made without departing from the scope of the claims.

10 8K equipment 11 Image monitor 90 Reference signal generator 100 Reference signal patterns 101-132 Area 200 Spectral trajectory 210 BT. 2020 color gamut 220 BT. 709 Color gamut 310 Horizontal stripe structure pattern 320 Vertical stripe structure pattern 330 Cyclone structure pattern 410 Horizontal stripe structure pattern 420 Vertical stripe structure pattern 430 Cyclone structure pattern 500 Hi-Vision reference signal pattern

Claims (9)

  A reference signal pattern used in an ultra high definition television (UHDTV) video system, and a video parameter of a video device that performs signal processing is BT. A reference signal pattern characterized by having a pattern whose color or structure changes when it does not satisfy the standard of a wide color gamut color system, 12-bit video, or 4: 4: 4 system sampling system defined in 2020 .   The reference signal pattern according to claim 1, wherein BT. BT.709, which is not included in the color gamut color system defined by 709. A first region having a first color included in the wide color gamut color system defined by 2020, and adjacent to the first region and having the same color as the first color. A reference signal pattern having a second region of a second color included in a color system defined by a 709 color gamut.   3. The reference signal pattern according to claim 1, wherein the reference signal pattern has a ramp pattern in which luminance increases at a rate of one gradation per pixel in a 12-bit gradation image.   4. The reference signal pattern according to claim 1, wherein a third color horizontal stripe having a width of one pixel and a fourth color horizontal stripe having a width of one pixel are alternately arranged. A horizontal stripe structure region, and a vertical stripe structure region in which a third color vertical stripe having a width of 1 pixel and a fourth color vertical stripe having a width of 1 pixel are alternately arranged. Reference signal pattern characterized by   5. The reference signal pattern according to claim 4, wherein the third color is magenta and the fourth color is white.   6. The reference signal pattern according to claim 1, wherein a white line refracted at a plurality of portions having a width of one pixel and a black line refracted at a plurality of portions having a width of one pixel are included in the reference signal pattern according to claim 1. A reference signal pattern comprising a pattern that is adjacent and generates a false color by demosaicing.   7. The reference signal pattern according to claim 6, wherein the white line and the black line have a spiral-shaped region.   8. The reference signal pattern according to claim 1, wherein the reference signal pattern has a structure pattern region that cannot be displayed at least at a resolution of less than horizontal 3840 pixels × vertical 2160 pixels. .   A reference signal generator for generating a reference signal pattern according to claim 1.