WO2015182910A1 - Diffusion d'image de haute définition - Google Patents

Diffusion d'image de haute définition Download PDF

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Publication number
WO2015182910A1
WO2015182910A1 PCT/KR2015/004947 KR2015004947W WO2015182910A1 WO 2015182910 A1 WO2015182910 A1 WO 2015182910A1 KR 2015004947 W KR2015004947 W KR 2015004947W WO 2015182910 A1 WO2015182910 A1 WO 2015182910A1
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Prior art keywords
image
quality
pixel
video
outline
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PCT/KR2015/004947
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English (en)
Korean (ko)
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김대영
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김대영
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/30—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using hierarchical techniques, e.g. scalability

Definitions

  • the present invention relates to high-definition video broadcasting, and more particularly, to a method of reproducing high-definition video by transmitting remaining high-quality video information together with low-quality video information.
  • MPEG-2 stream broadcasting inputs video and classifies it into I, P, and B video types, divides the video into 8 ⁇ 8 pixel blocks, inputs the intra video of I as it is,
  • An inter-image of P and B refers to the before and after images stored in the image buffer, inputs a difference between the predicted and compensated images, and reproduces the discrete cosine transform (DCT transform) for quantization. It is encoded and output through a buffer and output as a bitstream of an MPEG-2 stream.
  • the image of I dequantizes the transmitted image information and converts the inverse DCT and stores the image in the image buffer as a reference image.
  • the image of P predicts the movement of the reference image, compensates the movement, and reproduces the image. The image is combined with the rest of the reproduced image and stored in the image buffer as a reference image.
  • the compressed video transmitted through conventional MPEG-2 broadcasting can be displayed by doubling the number of pixels vertically and horizontally.
  • the image quality cannot be improved because it is restored to limited image information.
  • you broadcast according to H.265 / HEVC you can watch high-definition video, but the existing MPEG-2 receiver cannot play and there is a difficulty of broadcasting two broadcasts, MPEG-2 and HEVC.
  • a single high-definition broadcast can be watched by a conventional MPEG-2 receiver, and a high-definition receiver can be played by watching high-definition video.
  • an image of a general image quality (2K HD image) is obtained by converting (down-sampling) a high-quality image (4K UHD image) taken by a high-quality imager into one pixel.
  • a high-quality image (4K UHD image) taken by a high-quality imager into one pixel.
  • the remaining images of high quality are additionally transmitted.
  • the rest of the high quality image is composed of 1 pixel or 2 pixel wide lines and dots, and the line image generated by the difference in the quality of the outline between the high quality image and the normal quality image is large, and the line and dot of 1 pixel or 2 pixel width of the high quality image are large. Is the video of the rest.
  • the image reproducing apparatus of the conventional broadcast receiver may receive the MPEG-2 stream and play the image of the normal image quality.
  • the high-definition image reproducing apparatus of the present invention by converting the image of the normal image quality, 1 pixel to 2 ⁇ 2 pixels, The high resolution image and the remaining high quality image are reproduced, and the units of the two components are combined to restore the image to reproduce the high quality image.
  • High-quality video can be stored and transmitted separately from normal-quality video and the rest of the high-quality video, and the high-definition video can be viewed and viewed on a large display device.
  • a conventional receiver capable of receiving and playing only can receive and play only video information of MPEG-2 that is compatible with the existing broadcast to play and view a video of general quality, so that two broadcasts can be replaced by one broadcast.
  • the high definition image receiver plays a high quality image
  • the general image quality receiver plays a normal image quality.
  • the high definition receiver can improve the playback of the high quality image by processing the outline image.
  • FIG. 1 is a block diagram of a process of separating video information of a basic bitstream and an additional bitstream of MPEG-2 according to an embodiment of the present invention.
  • FIG. 2 is a block diagram of a process of reproducing a high-definition image by combining the images received and reproduced as the basic bitstream and the additional bitstream of FIG. 1.
  • FIG. 3 is a block diagram of a process of separating image information of multiple bitstreams according to another embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a procedure of scanning and transmitting elements obtained by frequency converting the remaining images of the present invention.
  • the present invention transmits a high-quality video by converting adjacent 2x2 pixels into a single pixel and transmits it to a basic bitstream of an MPEG-2 stream.
  • the high resolution image obtained by subtracting the high resolution image, which is converted into two pixels and is processed from the high quality image, is compressed and coded and transmitted as an additional bitstream.
  • the adjacent 2 ⁇ 2 pixels are converted into one pixel to take a normal picture
  • one pixel is converted into 2 ⁇ 2 pixels and the high-resolution image is converted by outline processing. Is approximated to a high-definition image and increases the image compression efficiency by reducing the amount of information of the remaining high-definition image minus the high resolution image.
  • the remaining high quality image is mainly composed of one pixel or two pixel wide lines, and is composed of ancillary points.
  • the line image is an image of one pixel or two pixels wide due to the difference of the outline image.
  • the image of the general image quality is up-sampled and converted into a high resolution image, and is approximated to the high image quality by interpolation between adjacent pixels of the general image quality.
  • the image of the pixel including the outline which is the line of the discontinuous image causes distortion.
  • a pixel adjacent to a pixel including an outline cannot calculate a pixel image value by interpolation, and the pixel value of the pixel is determined and approximated by extrapolation by adjacent pixels except for a pixel including an outline. .
  • the values of all frequency components are distributed in a direction perpendicular to the line, and information of the image is dispersed and inefficient.
  • the image of the line is extracted as a line and transmitted as the information of the line, and the image of the 1 pixel or 2 pixel width is left by subtracting the image of the line from the rest of the high quality image, which can be transmitted by frequency conversion, and quantized to reduce the amount of information.
  • the pixel block of the frequency-converting unit has a small number of large image values, it is frequency-converted and distributed over the entire region.
  • a small number of large image values may be coded by the position and size of the point to be quantized by subtracting the frequency-converted element from the rest of the image to efficiently transmit the element value to zero in the frequency domain.
  • the outline in the image is the tangent between the discontinuous images, and the image values of the left and right of the outline change into steps (steps).
  • steps There are high-quality images created by different sampling cycles and normal-quality images, and the values of the left and right pixel images of the pixels divided by the outline are the same, and the difference between the left and right pixel image values is the same.
  • the value is the ratio of the area of the left and right of one pixel divided by the outline, plus the value of the image of the left and right pixel of one pixel.
  • a high-quality image or a general-quality image when the difference between the image values of the left and right pixels of one pixel is large, and the image value of one pixel is within the range of the image values of the left and right pixels, there is an outline to divide one pixel. It is possible to predict the position of an outline that divides one pixel using image values of pixels and left and right pixels. Alternatively, the position of an outline that divides one pixel may be more accurately calculated in relation to one pixel including the outline and the position of the outline of the pixel including the continuous outline of the top and bottom or left and right.
  • An outline dividing adjacent pixels is connected to an outline of one pixel, and a line segment of adjacent outlines connected to the pixels can be connected to accurately predict the outline of one pixel.
  • each pixel is divided into two horizontally and vertically into 2x2 pixels, and 2x by the relationship between the position of the outline dividing one pixel and the pixel divided by two. It is possible to predict a high quality image by performing an outline process that determines an image value of two pixels, thereby obtaining a high resolution image close to the high quality image.
  • the sample may be upsampled by being distributed in multiples horizontally and vertically, and may be upsampled at an arbitrary ratio.
  • a high-definition image can be predicted by performing an outline process that determines an image value of a pixel of a high-resolution image based on a positional relationship between an outline of a pixel and a position of a high-resolution image pixel, thereby obtaining a high-resolution image close to a high-definition image.
  • the image of I inputs a high-quality image
  • the image of P and B before and after the image buffer
  • An image obtained by subtracting an image compensated 140 from a high quality image by predicting the motion of the reference image is input, and the adjacent 2x2 pixels are converted into one pixel (121), and the image is converted into a general image quality.
  • the video is compressed and coded (110b-1 and 110b-2) by a conventional method of MPEG-2 broadcasting, the motion vector is detected 140 by predicting the motion of the reference video of the P and B video, and the MPEG-2 Output as a stream to send a basic bit stream (basic bit stream).
  • the high-definition video which is upsampled by converting one pixel to 2 ⁇ 2 pixels and outline-processed 130, is converted from the high-definition video by reproducing (110b-3) the image quality transmitted as the image information transmitted as the basic bitstream.
  • the rest of the high quality image is composed of linear images and images of points with low direct current (DC) components, and the images of lines and points are coded into lines and points through the prediction and compensation of lines and points 120, and the lines and points are coded.
  • One image information is compensated with lines and dots (120), subtracted from the remaining high-quality image, and becomes the remaining image.
  • the remaining image is frequency-converted (110a) and quantized to reduce the amount of image information, increase compression efficiency, and buffer. It processes and outputs the additional bit stream to transmit.
  • the frequency-converted element can be quantized and compressed, and the rest of the image has a small plane component and a straight line component, and the high-frequency transformed frequency element is a visual image of points. Can be increased.
  • the value of the frequency-converted element of one pixel block is driven to the center. As shown in FIG. 4, the scan of the frequency element starts at a large element in the center, and the value of the element moves out of small, and an element having a small value of 0 does not transmit, thereby increasing transmission efficiency.
  • the image information coded by lines and dots and the frequency conversion 110a of the remaining images are transmitted as additional bitstreams.
  • Prediction and compensation 140 of the motion of the P and B images are predicted and compensated according to the high quality image, the motion vector of the high quality image is transmitted as an additional bitstream, and the motion vector transmitted as the basic bitstream is the motion of the high quality image. Let's take 1/2 of the vector.
  • the starting position of the linear image and the size of the image, the moving distance (or position) and image size (or amount of change) of the next position, and the moving distance (or position) of the next position And the image size (or amount of change), ..., the moving distance (or position) of the final position and the amount of change (or size) of the image size, and also one pixel are coded by the position and the size of the image.
  • Continuous straight pixels can be displayed in a straight line, and the start and end positions of the straight line can be displayed to predict a straight line image within a maximum of 1 pixel in the straight line.
  • the image of a point can be a point at one pixel, a point across two pixels in a 2 ⁇ 2 pixel block, a point across 4 pixels in a 2 ⁇ 2 pixel block, or a point across 2 blocks of a 2 ⁇ 2 pixel block, 4 2 It can be coded by classifying it as a point over a x2 pixel block.
  • the magnitude of the value of the image of the line and the image of the point can be quantized to reduce the amount of information.
  • the size of an image may be compressed by one-dimensional frequency conversion on one line.
  • the basic bitstream and the additional bitstream To play the video.
  • the basic bitstream can be input to reproduce a normal image quality by 250b like an MPEG-2 stream reproducing apparatus, detects an outline in the normal quality image, converts one pixel into 2 ⁇ 2 pixels, and processes the outline. 270) to reproduce a high resolution image.
  • the additional bitstream is received to reproduce the remaining high quality image (250a, 260 (reproduction of lines and dots)), and the high resolution image and the high quality remaining image are combined to reproduce the high quality image.
  • switch control of 122, 142, 262, and 282 is performed according to the type of images of I, P, and B.
  • 130 of FIG. 1 and 270 of FIG. 2 are blocks for converting a basic image into a high resolution image and processing outlines, and have the same function and characteristics.
  • a high quality video is divided into a general quality video and a remaining high quality video and transmitted as an MPEG-2 stream and an additional bit stream. Converts the normal quality video of the MPEG-2 stream to high resolution video and outlines it to reduce the amount of information in the rest of the high quality video, and the remaining video is coded in lines and dots to reduce the amount of information and converts it into a small additional bitstream.
  • the primary bitstream and the additional bitstream may be multiplexed and transmitted through one broadcast channel.
  • a high-definition video of 8K (image having 8K horizontal pixels) input is converted into a 4K video by converting adjacent 2x2 pixels into a single pixel, and converting a 4K video. Adjacent 2 ⁇ 2 pixels are converted into one pixel and converted into a 2K image.
  • the lowest quality video (2K video) can be coded by HEVC video compression and transmitted as a HEVC bitstream, and the remaining high quality video (4K) is subtracted by subtracting the video of low quality (2K).
  • the remaining high-definition video (4K) is coded into other bitstreams by compressing and coding the remaining image subtracted from the low-quality (2K) transmitted video. And compressing and coding the rest of the video after subtracting the video of low quality (2K) from the next high quality video (4K) into lines and dots and transmitting it to another bitstream, and the highest quality video (8K). Compresses and encodes the remaining high-definition (4K) video by using lines and dots, and transmits it to another bitstream. The rest can transmit images.
  • an 8K image is input and converted to a 4K image (321a), and a 4K image is converted to a 2K image (321b).
  • a 2K image is predicted and compensated for in the intra image (320c), and bitstream processing (310c) to output a bit stream c (bit stream c).
  • the 2K video played back with the bitstream c is converted into one pixel to 2 ⁇ 2 pixels, and the edge processing (330b) is performed to remove the 4K video to obtain the remaining 4K video, and the remaining 4K video is linearly and point predicted.
  • an image processed by reproducing the image transmitted from the 8K video to the 2K and 4K bitstream is processed as an outline.
  • the remaining 8K images are obtained by subtracting the 8K high-resolution images.
  • the remaining images are subjected to bitstream processing (310a), and the bitstream a (bit stream a) is output.
  • the bitstream c of the basic bitstream transmits 2K video
  • the bitstream b of the additional bitstream transmits the remaining 4K video
  • the bitstream a of the additional bitstream transmits the remaining 8K video.
  • the high definition image reproducing apparatus inputs the bitstreams a, b and c to reproduce an 8K high definition image
  • the image reproducing apparatus capable of displaying the 4K image reproduces the 4K image by receiving the bitstreams c and b.
  • a video reproducing apparatus capable of displaying 2K video receives and reproduces only the bitstream c.
  • the bitstream of the lowest quality video (2K video) conforms to the HEVC standard to improve compression efficiency, improve the quality of 4K and 8K video, and multiplex to one broadcast channel to make the bitstream a, b, c can be sent.
  • FIG. 3 there is a function of prediction and compensation 320c of an intra image, and a filter 343 is included in a loop for predicting and compensating for motion 340.
  • the size of the image pixel block, the frequency conversion block, the image information block, etc., which perform each function, are varied, and the processing functions are also varied, and the precision control is performed to lower the bit rate and improve the image quality.
  • the image of I is obtained by outline-processing (330b) the 2K image reproduced by 320c and 310c, and by adding the remaining 4K image reproduced by 320b and 310b by the outline-processed image (330a), and reproduced by 320a and 310a.
  • the remaining 8K images are stored together as a reference image (340), and the P images are stored as a reference image (340) together with the motion prediction and compensation (340) image.
  • the motion prediction and compensation 340 predicts the motion vector based on the 8K image, transmits the 8K motion vector to the bitstream a, and the bitstream b that transmits the remaining 4K image is 1 / of the motion vector of the 8K image.
  • a bitstream c that transmits a size of 2 and transmits a 2K image transmits 1/4 of a motion vector of an 8K image.
  • 320c predicts and compensates an image according to the HEVC standard, and the rest of the image is composed of lines and dots.
  • 320b and 320a may be limited to prediction and compensation of lines and points.
  • 121, 321a, and 321b converting a high quality image or an upper image into a general image or a lower image are approximating and down sampling the upper image.
  • the low pass filter can be used, and 130, 330a, and 330b, which convert a normal image or a lower image into a higher resolution image, are processes of obtaining an image close to the upper image by upsampling and predicting the lower image. .
  • other approximations and predictions can be made.
  • the outlines, which are tangents between discontinuous images can be predicted and converted into high resolution images of high resolution.
  • Images of pixels that do not include an outline are approximate and can be predicted to reproduce an optimal high resolution image and reduce the amount of information of the remaining images.
  • the pixel including the outline converts the 2 ⁇ 2 pixels into a normal image or a lower image, and the pixel including the outline in the normal image or the lower image is processed as an outline and processed into 2 ⁇ 2 pixels. Convert to pixels to obtain high resolution images.
  • the remaining high resolution image is subtracted from the high-definition image to obtain the remaining images.
  • the remaining image is small and cannot be visually distinguished from the outlined image.
  • the remaining image of the 2 ⁇ 2 pixel processed by the pixel including the outline may be 0, thereby improving image compression efficiency.
  • the pixel coded with the line may be regarded as no other image and may be zero.
  • One pixel of general quality is obtained by averaging 2 ⁇ 2 pixels of high quality, and converting one pixel including an outline of general image quality to 2 ⁇ 2 pixels of adjacent quality, and converting it to a high resolution image by processing an accurate outline
  • the image value of 2x2 adjacent pixels including pixels including the outline of the remaining images minus the high resolution image will be 0.
  • the above image is converted to a multiple ratio of 2 times, 4 times, etc., but can be converted to any number of pixel magnifications, and includes an adjacent pixel of one pixel of the original image to convert the image by interpolation.
  • the image value of the pixel may be calculated.
  • one pixel of an HD image that receives and reproduces a bitstream transmitted as an MPEG-2 stream is converted into 2 ⁇ 2 pixels or pixels at an arbitrary ratio, and converted to a high resolution image by performing an outline process.
  • a high definition image reproducing apparatus provided with a display can be viewed.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Television Systems (AREA)

Abstract

La présente invention concerne une image de haute définition divisée en une image de qualité normale, dans laquelle un nombre de 2x2 pixels est converti en un pixel, et en une image de haute définition restante, qui est obtenue en soustrayant une image de haute résolution de l'image de haute définition, l'image de haute résolution étant obtenue par conversion d'un pixel de l'image de qualité normale en un nombre de 2x2 pixels et par exécution d'un traitement de contour de cette dernière. L'image de qualité normale est transmise dans un train de bits de base d'un flux MPEG-2, l'image de haute définition restante est codée au moyen de lignes et de points, et la partie restante est convertie en fréquence et est transmise au moyen d'un train de bits supplémentaire. Un lecteur d'image MPEG-2 classique reproduit une image de qualité normale par la réception d'un train de bits de base et un lecteur d'image de haute définition reproduit l'image de haute définition restante qui est de plus transmise conjointement avec l'image de qualité normale de façon à reproduire l'image de haute définition.
PCT/KR2015/004947 2014-05-26 2015-05-19 Diffusion d'image de haute définition WO2015182910A1 (fr)

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KR10-2014-0063329 2014-05-26

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CN109429085B (zh) * 2017-08-30 2021-06-22 三星电子株式会社 显示装置及其图像处理方法
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US11532075B2 (en) 2017-08-30 2022-12-20 Samsung Electronics Co., Ltd. Display apparatus for restoring high-frequency component of input image and image processing method thereof

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