WO2013002111A1 - Dispositif et procédé de traitement d'image - Google Patents

Dispositif et procédé de traitement d'image Download PDF

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Publication number
WO2013002111A1
WO2013002111A1 PCT/JP2012/065820 JP2012065820W WO2013002111A1 WO 2013002111 A1 WO2013002111 A1 WO 2013002111A1 JP 2012065820 W JP2012065820 W JP 2012065820W WO 2013002111 A1 WO2013002111 A1 WO 2013002111A1
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WO
WIPO (PCT)
Prior art keywords
quantization parameter
unit
region
image
difference
Prior art date
Application number
PCT/JP2012/065820
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English (en)
Japanese (ja)
Inventor
健治 近藤
Original Assignee
ソニー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by ソニー株式会社 filed Critical ソニー株式会社
Publication of WO2013002111A1 publication Critical patent/WO2013002111A1/fr

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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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/174—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a slice, e.g. a line of blocks or a group of blocks
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/124—Quantisation
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/154—Measured or subjectively estimated visual quality after decoding, e.g. measurement of distortion
    • 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
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/189—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding
    • H04N19/196—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the adaptation method, adaptation tool or adaptation type used for the adaptive coding being specially adapted for the computation of encoding parameters, e.g. by averaging previously computed encoding parameters
    • 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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding

Definitions

  • the conventional macroblock size of 16 pixels ⁇ 16 pixels is a large image frame such as UHD (Ultra High Definition: 4000 pixels ⁇ 2000 pixels), which is the target of the next generation encoding method. There was a fear that it was not optimal.
  • intra prediction-predicted units (PU) and inter-predicted prediction units (PU) can be mixed in B slices and P slices.
  • the condition determination unit determines whether or not a difference between the image quality of the attention area and the image quality of the surrounding area is large by confirming a prediction method of the attention area and a type of a slice in which the attention area exists. can do.
  • the calculation unit 103 subtracts the prediction image supplied from the intra prediction unit 114 from the image read from the screen rearrangement buffer 102.
  • the arithmetic unit 103 subtracts the predicted image supplied from the motion prediction / compensation unit 115 from the image read from the screen rearrangement buffer 102.
  • the intra prediction unit 114 generates predicted images in all candidate intra prediction modes, evaluates the cost function value of each predicted image using the input image supplied from the screen rearrangement buffer 102, and selects the optimum mode. select. When the intra prediction unit 114 selects the optimal intra prediction mode, the intra prediction unit 114 supplies the predicted image generated in the optimal mode to the predicted image selection unit 116.
  • the intra prediction unit 114 appropriately supplies intra prediction information including information related to intra prediction, such as an optimal intra prediction mode, to the lossless encoding unit 106 to be encoded.
  • the predicted quantization parameter generation unit 141 supplies the generated predicted quantization parameter to the difference quantization parameter generation unit 144.
  • step S111 the calculation unit 110 adds the predicted image selected in step S105 to the difference image generated in step S110, and generates a locally decoded image (reconstructed image).
  • step S112 the loop filter 111 appropriately performs a loop filter process including a deblocking filter process and an adaptive loop filter process on the reconstructed image obtained by the process of step S111 to generate a decoded image.
  • step S114 the lossless encoding unit 106 encodes the orthogonal transform coefficient quantized by the process in step S107. That is, lossless encoding such as variable length encoding or arithmetic encoding is performed on the difference image. Note that the lossless encoding unit 106 encodes information about prediction, information about quantization, information about filter processing, and the like, and adds the information to the bitstream.
  • the accumulation buffer 201 accumulates the transmitted encoded data, and supplies the encoded data to the lossless decoding unit 202 at a predetermined timing.
  • the lossless decoding unit 202 decodes the information supplied from the accumulation buffer 201 and encoded by the lossless encoding unit 106 in FIG. 1 by a method corresponding to the encoding method of the lossless encoding unit 106.
  • the lossless decoding unit 202 supplies the quantized orthogonal transform coefficient of the difference image obtained by decoding to the inverse quantization unit 203.
  • the calculation unit 252 further adds the offset (iqp_offset) supplied from the offset storage unit 241 to the addition value (dQP + RefQP) supplied from the calculation unit 251, and supplies the addition value (dQP + RefQP + iqp_offset) to the selection unit 253.
  • step S210 the D / A converter 208 D / A converts the decoded image in which the frame order is rearranged.
  • the decoded image is output and displayed on a display (not shown).
  • the quantization parameter of the intra area existing in the inter slice as shown in FIG. 3 may be set to a value larger than that of the surrounding inter area.
  • the offset (iqp_offset) is a positive value because it is used to generate the differential quantization parameter in the intra region.
  • the quantization parameter of the inter area may be set to a value smaller than that of the intra area.
  • the offset (iqp_offset) is a negative value because it is used to generate the inter region differential quantization parameter.
  • a CPU (Central Processing Unit) 501 of the personal computer 500 performs various processes according to a program stored in a ROM (Read Only Memory) 502 or a program loaded from a storage unit 513 to a RAM (Random Access Memory) 503. Execute the process.
  • the RAM 503 also appropriately stores data necessary for the CPU 501 to execute various processes.
  • the analog voice signal generated by the microphone 925 is supplied to the voice codec 923.
  • the audio codec 923 converts an analog audio signal into audio data, A / D converts the compressed audio data, and compresses it. Then, the audio codec 923 outputs the compressed audio data to the communication unit 922.
  • the communication unit 922 encodes and modulates the audio data and generates a transmission signal. Then, the communication unit 922 transmits the generated transmission signal to a base station (not shown) via the antenna 921. In addition, the communication unit 922 amplifies a radio signal received via the antenna 921 and performs frequency conversion to acquire a received signal.
  • the demultiplexing unit 928 multiplexes the video stream encoded by the image processing unit 927 and the audio stream input from the audio codec 923, and the multiplexed stream is the communication unit 922. Output to.
  • the communication unit 922 encodes and modulates the stream and generates a transmission signal. Then, the communication unit 922 transmits the generated transmission signal to a base station (not shown) via the antenna 921.
  • the communication unit 922 amplifies a radio signal received via the antenna 921 and performs frequency conversion to acquire a received signal.
  • These transmission signal and reception signal may include an encoded bit stream.
  • the communication unit 922 demodulates and decodes the received signal to restore the stream, and outputs the restored stream to the demultiplexing unit 928.
  • the demultiplexing unit 928 separates the video stream and the audio stream from the input stream, and outputs the video stream to the image processing unit 927 and the audio stream to the audio codec 923.
  • the image processing unit 927 decodes the video stream and generates video data.
  • the video data is supplied to the display unit 930, and a series of images is displayed on the display unit 930.
  • the audio codec 923 decompresses the audio stream and performs D / A conversion to generate an analog audio signal. Then, the audio codec 923 supplies the generated audio signal to the speaker 924 to output audio.
  • the optical block 961 includes a focus lens and a diaphragm mechanism.
  • the optical block 961 forms an optical image of the subject on the imaging surface of the imaging unit 962.
  • the imaging unit 962 includes an image sensor such as a CCD (Charge-Coupled Device) or a CMOS (Complementary Metal-Oxide Semiconductor), and converts an optical image formed on the imaging surface into an image signal as an electrical signal by photoelectric conversion. Then, the imaging unit 962 outputs the image signal to the signal processing unit 963.
  • CCD Charge-Coupled Device
  • CMOS Complementary Metal-Oxide Semiconductor

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computing Systems (AREA)
  • Theoretical Computer Science (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

Cette technologie se rapporte à un dispositif et un procédé de traitement d'image qui permettent d'accroître la qualité d'image des images décodées et de limiter le plus possible la baisse de l'efficacité du codage. Ledit dispositif de traitement d'image comprend : une unité de détermination destinée à déterminer s'il existe une grande disparité de qualité d'image entre une zone considérée qui se trouve dans une zone à traiter, et la zone périphérique d'une image décodée ; une unité de génération de paramètres de quantification différentielle permettant de générer les paramètres de quantification différentielle pour la zone considérée par le biais d'une opération qui utilise un décalage imposé, si ladite unité de détermination détermine qu'il existe une grande disparité de qualité d'image entre la zone considérée et la zone périphérique ; et une unité de transmission conçue pour transmettre les paramètres de quantification différentielle générés par ladite unité de génération de paramètres de quantification différentielle. La présente invention s'applique aux dispositifs de traitement d'image.
PCT/JP2012/065820 2011-06-30 2012-06-21 Dispositif et procédé de traitement d'image WO2013002111A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011145567A JP2013012996A (ja) 2011-06-30 2011-06-30 画像処理装置および方法
JP2011-145567 2011-06-30

Publications (1)

Publication Number Publication Date
WO2013002111A1 true WO2013002111A1 (fr) 2013-01-03

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PCT/JP2012/065820 WO2013002111A1 (fr) 2011-06-30 2012-06-21 Dispositif et procédé de traitement d'image

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JP (1) JP2013012996A (fr)
WO (1) WO2013002111A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110267037B (zh) * 2019-06-21 2021-08-13 腾讯科技（深圳）有限公司 视频编码方法、装置、电子设备及计算机可读存储介质

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007020036A (ja) * 2005-07-11 2007-01-25 Toshiba Corp 画像送信装置および画像受信装置
JP2010081240A (ja) * 2008-09-25 2010-04-08 Canon Inc 符号化装置および符号化方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007020036A (ja) * 2005-07-11 2007-01-25 Toshiba Corp 画像送信装置および画像受信装置
JP2010081240A (ja) * 2008-09-25 2010-04-08 Canon Inc 符号化装置および符号化方法

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