WO2016203539A1 - Image encoding scheme conversion device and image encoding scheme conversion method - Google Patents

Image encoding scheme conversion device and image encoding scheme conversion method Download PDF

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WO2016203539A1
WO2016203539A1 PCT/JP2015/067277 JP2015067277W WO2016203539A1 WO 2016203539 A1 WO2016203539 A1 WO 2016203539A1 JP 2015067277 W JP2015067277 W JP 2015067277W WO 2016203539 A1 WO2016203539 A1 WO 2016203539A1
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image signal
encoding
encoded
motion
inter
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勝大 草野
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三菱電機株式会社
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Priority to JP2017524174A priority patent/JP6312934B2/en
Priority to TW104120263A priority patent/TWI558171B/en
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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
    • H04N19/102—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
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/107—Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh
    • 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
    • H04N19/132—Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • 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
    • H04N19/136—Incoming video signal characteristics or properties
    • H04N19/137—Motion inside a coding unit, e.g. average field, frame or block difference
    • 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
    • H04N19/172—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 picture, frame or field
    • 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
    • H04N19/40—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using video transcoding, i.e. partial or full decoding of a coded input stream followed by re-encoding of the decoded output stream
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/587—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal sub-sampling or interpolation, e.g. decimation or subsequent interpolation of pictures in a video sequence

Definitions

  • the present invention relates to an image coding method conversion apparatus for re-encoding a coded image signal.
  • MPEG-2 Motion Picture Expert Group
  • DVD Digital Versatile Disk
  • HDD Digital Versatile Disk
  • DVD-VIDEO terrestrial digital broadcasting (one-segment broadcasting) for mobile terminals
  • Blu- ray registered trademark
  • MPEG-4 AVC Advanced Video Coding
  • ITU-T H. H.264 for example, Non-Patent Document 1).
  • Patent Document 1 there is an invention in which moving image data is further compressed by deleting a non-motion B (Bi-Directional Predictive) picture from an encoded image signal.
  • non-motion B Bi-Directional Predictive
  • an image decoding device decodes an encoded image signal into an image signal, performs image analysis on the decoded image signal, and re-encodes the decoded image signal based on the analysis result. Therefore, there is a problem that a large amount of calculation is required.
  • a B picture with no motion is deleted.
  • the B picture has a smaller data amount than an I (Intra) picture or a P (Predictive) picture, a high compression effect is obtained. There was a problem that it was not possible.
  • GOP Group of Pictures
  • Entropy decoding is performed on the encoded P picture image signal to acquire encoding information such as a macroblock type and a motion vector in units of macroblocks. Based on the acquired encoded information, it is determined whether or not there is motion in the picture. If there is no motion, the corresponding picture is deleted. When all the P pictures following the I picture are deleted, it is determined that there is no motion in the I picture, and re-encoding is performed to the P picture. As described above, since entropy decoding is performed on P pictures and only I pictures are to be re-encoded, it is possible to reduce the amount of calculation related to image coding scheme conversion.
  • An image coding method conversion apparatus is Coding for determining whether the coded image signal is intra-coded or inter-coded by inputting a coded image signal in which a plurality of intra-coded image signals and inter-coded image signals are combined.
  • An entropy decoding unit A motion determination unit that determines the presence or absence of motion of the inter-screen encoded image signal based on the encoding information; An image deletion unit that deletes the inter-screen encoded image signal determined by the motion determination unit to have no motion; An image re-encoding determination unit that determines whether or not to re-encode the encoded image signal determined as the intra-screen encoded image signal by the encoding type determination unit; A decoding unit that decodes the intra-coded signal determined to be re-encoded by the image re-encoding determination unit; An encoding unit for inter-coding the decoded image signal decoded by the decoding unit; It is characterized by comprising.
  • an entropy decoding unit that performs entropy decoding processing on an encoded P picture, a motion determination unit that determines presence / absence of motion from encoded information output by the entropy decoding unit, If it is determined that there is no picture, the picture deleting unit that deletes the corresponding encoded P picture and the determination of re-encoding of the encoded I picture when all the encoded P pictures following the encoded I picture are deleted
  • FIG. 1 It is a block diagram which shows an example of the image coding apparatus which concerns on Embodiment 1 of this invention. It is a figure for demonstrating the motion determination method in the motion determination part 103 of the image coding apparatus which concerns on Embodiment 1 of this invention. It shows the order of pictures for performing motion determination in the image coding apparatus according to Embodiment 1 of the present invention.
  • 2 is a flowchart of processing for 1 GOP of the image coding apparatus according to Embodiment 1 of the present invention; The example which performed the process with respect to GOP of the image coding apparatus which concerns on Embodiment 1 of this invention is shown. The example which performed the process with respect to GOP of the image coding apparatus which concerns on Embodiment 1 of this invention is shown.
  • Embodiment 1 FIG.
  • an entropy decoding unit that performs entropy decoding processing on an encoded P (Predictive) picture
  • a motion determination unit that determines the presence or absence of motion from encoded information output from the entropy decoding unit
  • a picture deletion unit that deletes the corresponding encoded P picture and all the encoded P pictures that follow the encoded I (Intra) picture are deleted.
  • a picture re-encoding determination unit for determining re-encoding of the encoded I picture, an image signal decoding unit for decoding the encoded I picture, and an image signal encoding unit for re-encoding the decoded image signal into a P picture It is possible to determine whether or not there is motion by only entropy decoding with respect to the encoded P picture, and re-encode the encoded I picture into the P picture. Since it is configured, it is re-compressed with a small amount of calculation, the image coding method conversion apparatus is described which can reduce the data amount of the encoded image signal.
  • FIG. 1 is a block diagram showing an example of an image coding method conversion apparatus according to Embodiment 1 of the present invention.
  • a picture type determination unit 101 which is an encoding type determination unit determines whether an input encoded image signal is an I picture or a P picture.
  • the entropy decoding unit 102 performs entropy decoding on the encoded P picture determined by the picture type determination unit 101 as a P picture, and outputs encoded information.
  • the motion determination unit 103 determines the presence or absence of motion of the encoded P picture using the encoded information output from the entropy decoding unit. When the motion determination unit 103 determines that there is no motion, the picture deletion unit 104 that is an image deletion unit deletes the encoded P picture and outputs picture deletion information.
  • a picture re-encoding determination unit 105 which is an image re-encoding determination unit, re-encodes an encoded I-picture based on the picture deletion information output by the picture deletion unit 104 when the picture type determination unit 101 determines that the picture is an I picture. It is determined whether or not to encode.
  • the image signal decoding unit 106 serving as a decoding unit decodes the encoded I picture determined to be re-encoded by the picture re-encoding determination unit 105, and outputs a decoded image signal.
  • the image signal encoding unit 107 which is an encoding unit performs image encoding with reference to the past decoded image signal output from the image signal decoding unit 106 and stored in the picture buffer 108, and re-encodes the image signal. P picture is output.
  • the picture buffer 108 accumulates the decoded image signal output from the image signal decoding unit 106.
  • FIG. 2 is a diagram for explaining a motion determination method in the motion determination unit 103.
  • the macro block is, for example, a block of 16 pixels ⁇ 16 lines, and has encoding information for each macro block.
  • the encoding information has a quantization parameter and a macro block type (including 16 ⁇ 16, 16 ⁇ 8, 8 ⁇ 16, and 8 ⁇ 8 in FIG. 2 including a block division type).
  • the intra prediction mode has reference picture information and a motion vector (arrow in FIG. 2).
  • the motion vector indicates how much the macroblock has moved with respect to the reference picture. For example, when the maximum length (norm) of the motion vector in the picture exceeds an arbitrary threshold, The motion determination unit 103 determines that there is motion in the part. Furthermore, in order to capture fine motion in a picture, if there are blocks smaller than 16 ⁇ 16 (16 ⁇ 8, 8 ⁇ 16, 8 ⁇ 8 in FIG. 2) in the block division type of the inter macro block, the motion Even if the maximum vector length is smaller than the above threshold, it is determined that there is motion.
  • FIG. 3 shows the order of pictures in which the motion determination unit 103 performs motion determination.
  • GOPs Group of Pictures
  • FIG. 4 shows a flowchart of processing for 1 GOP according to Embodiment 1 of the present invention.
  • the picture type determination unit 101 determines whether the input picture is an I picture or a P picture (ST11). When it is a P picture, the entropy decoding unit 102 performs entropy decoding and outputs encoded information (ST12).
  • the motion determination unit 103 determines the presence or absence of motion from the encoded information output by the entropy decoding unit 102 (ST13). If there is movement, the process is terminated. If there is no motion, the corresponding picture is deleted (ST14), and processing of the previous picture is started.
  • the picture type discriminating unit 101 determines that the picture is an I picture, it is confirmed whether or not a picture other than the top picture has been deleted in the immediately preceding GOP (ST15). If yes, a process of reconverting the I picture into the P picture is performed (ST16). If not deleted, the re-conversion is not performed and the process is terminated.
  • FIG. 5 shows an example in which processing other than the top picture of GOP1 is deleted and GOP2 is processed.
  • a picture surrounded by a solid line represents a picture that has not been deleted, and a picture surrounded by a dotted line represents a deleted picture.
  • the I picture is reconverted into a P picture that refers to the first picture in the immediately preceding GOP1.
  • FIG. 6 shows an example in which processing other than the first picture and the second picture of GOP1 is deleted and GOP2 processing is performed.
  • the undeleted picture and the deleted picture are represented by solid lines and dotted lines. Even when it is determined that there is no motion in all P pictures in GOP2, since two pictures remain in the immediately preceding GOP1, re-conversion of the I picture is not performed.
  • the presence / absence of motion is determined using the maximum value of the length of the motion vector and the block type of the inter-macroblock has been described.
  • other encoded information obtained by entropy decoding is used. You may comprise so that it may determine using.
  • the processing for the GOP composed only of the I picture and the P picture has been described.
  • the B (Bidirectionally Predictive) picture also includes motion information in the encoded information, the B picture You may comprise so that it may implement with respect to GOP containing.
  • the entropy decoding unit that performs the entropy decoding process on the encoded P picture, and the encoding information output from the entropy decoding unit
  • a motion determination unit that determines the presence or absence of motion, a picture deletion unit that deletes the corresponding encoded P picture when the motion determination unit determines that there is no motion, and all the encoded P pictures that follow the encoded I picture
  • a picture re-encoding determination unit that determines re-encoding of an encoded I picture, an image signal decoding unit that decodes the encoded I picture, and an image that re-encodes the decoded image signal into a P picture
  • a signal encoding unit configured to determine whether or not there is motion by only entropy decoding for the encoded P picture, and re-encode the encoded I picture to the P picture Since, it is re-compressed with a small amount of calculation, it is possible to reduce the data amount of the encoded
  • the image coding system conversion apparatus can be applied as an image coding system conversion apparatus that re-encodes an encoded image signal.

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Abstract

In order to obtain an image encoding scheme conversion device with which it is possible to achieve recompression with a small amount of calculation and reduce the data amount of an encoded image signal, the present invention is provided with: an encoding type determination unit for determining whether an encoded image signal is intra-screen encoded or inter-screen encoded; an entropy decoding unit for applying an entropy decoding process to the encoded image signal if the same is determined to be an inter-screen encoded image signal, and outputting encoding information for each region into which the entropy-decoded image is divided in prescribed units; a motion determination unit for determining on the basis of the encoding information whether the inter-screen encoded image signal includes motion; an image removal unit for removing an inter-screen encoded image signal that is determined by the motion determination unit to include no motion; an image re-encoding determination unit for determining whether or not to re-encode the encoded image signal if the same is determined by the encoding type determination unit to be an intra-screen encoded image signal; a decoding unit for decoding the intra-screen encoded image signal when it is determined by the image re-encoding determination unit that the intra-screen encoded image is to be re-encoded; and an encoding unit for inter-screen encoding the decoded image signal decoded by the decoding unit.

Description

画像符号化方式変換装置及び画像符号化方式変換方法Image coding method conversion apparatus and image coding method conversion method
　この発明は、符号化された画像信号を再符号化する画像符号化方式変換装置に関するものである。 The present invention relates to an image coding method conversion apparatus for re-encoding a coded image signal.
　近年、動画像を圧縮して符号化する技術が広く用いられている。動画像の符号化方式としては、例えば、ＤＶＤ（Ｄｉｇｉｔａｌ　Ｖｅｒｓａｔｉｌｅ　Ｄｉｓｋ）－ＶＩＤＥＯに採用されているＭＰＥＧ－２（Ｍｏｖｉｎｇ　Ｐｉｃｔｕｒｅ　Ｅｘｐｅｒｔ　Ｇｒｏｕｐ）方式や、携帯端末向けの地上デジタル放送（ワンセグ放送）やＢｌｕ－ｒａｙ（登録商標）　Ｄｉｓｋに採用されているＭＰＥＧ－４　ＡＶＣ（Ａｄｖａｎｃｅｄ　Ｖｉｄｅｏ　Ｃｏｄｉｎｇ）／ＩＴＵ－Ｔ　Ｈ．２６４方式などがある（例えば非特許文献１）。 In recent years, techniques for compressing and encoding moving images have been widely used. As a moving image encoding method, for example, MPEG-2 (Moving Picture Expert Group) method adopted for DVD (Digital Versatile Disk) -VIDEO, terrestrial digital broadcasting (one-segment broadcasting) for mobile terminals, Blu- ray (registered trademark) MPEG-4 AVC (Advanced Video Coding) / ITU-T H. H.264 (for example, Non-Patent Document 1).
　また、特許文献１のように、符号化された画像信号に対して、動きのないＢ（Ｂｉ－Ｄｉｒｅｃｔｉｏｎａｌ　Ｐｒｅｄｉｃｔｉｖｅ）ピクチャを削除することで、動画像のデータをより圧縮しようとする発明もある。 Also, as disclosed in Patent Document 1, there is an invention in which moving image data is further compressed by deleting a non-motion B (Bi-Directional Predictive) picture from an encoded image signal.
特開２００４－２８９８７６号公報JP 2004-289876 A
　従来の画像符号化方式変換装置では、画像復号装置にて符号化画像信号を画像信号に復号した後、復号画像信号に対して画像解析を実施し、解析結果に基づいて復号画像信号を再符号化するため、多くの計算量が必要になるという課題があった。
　また、特許文献１の記録装置では、動きのないＢピクチャを削除しているが、ＢピクチャはＩ（Ｉｎｔｒａ）ピクチャやＰ（Ｐｒｅｄｉｃｔｉｖｅ）ピクチャに比べてデータ量が小さいため、高い圧縮効果を得ることができないという課題があった。 In a conventional image coding system conversion device, an image decoding device decodes an encoded image signal into an image signal, performs image analysis on the decoded image signal, and re-encodes the decoded image signal based on the analysis result. Therefore, there is a problem that a large amount of calculation is required.
In addition, in the recording apparatus of Patent Document 1, a B picture with no motion is deleted. However, since the B picture has a smaller data amount than an I (Intra) picture or a P (Predictive) picture, a high compression effect is obtained. There was a problem that it was not possible.
　この発明は、上記のような課題を解決するためになされたもので、ＧＯＰ（Ｇｒｏｕｐ
ｏｆ　Ｐｉｃｔｕｒｅｓ）を一つの処理単位とし、ＧＯＰの最後のＰピクチャから処理を実施していく。符号化されたＰピクチャ画像信号に対して、エントロピー復号を実施し、マクロブロック単位のマクロブロックタイプや動きベクトル等の符号化情報を取得する。取得した符号化情報をもとにしてピクチャ内に動きがあるか否かを判定し、動きがない場合は、該当ピクチャを削除する。
　また、Ｉピクチャに後続するＰピクチャ全てを削除した場合は、Ｉピクチャに動きがないと判定し、Ｐピクチャへ再符号化を行う。
　上記により、Ｐピクチャに対してエントロピー復号、Ｉピクチャのみを再符号化対象としているため、画像符号化方式変換に係る計算量を低減することができる。 The present invention has been made in order to solve the above-described problems. GOP (Group)
of Pictures) as one processing unit, and processing is performed from the last P picture of the GOP. Entropy decoding is performed on the encoded P picture image signal to acquire encoding information such as a macroblock type and a motion vector in units of macroblocks. Based on the acquired encoded information, it is determined whether or not there is motion in the picture. If there is no motion, the corresponding picture is deleted.
When all the P pictures following the I picture are deleted, it is determined that there is no motion in the I picture, and re-encoding is performed to the P picture.
As described above, since entropy decoding is performed on P pictures and only I pictures are to be re-encoded, it is possible to reduce the amount of calculation related to image coding scheme conversion.
　この発明に係る画像符号化方式変換装置は、
　画面内符号化画像信号と画面間符号化画像信号が複数まとまった符号化画像信号を入力し、前記符号化画像信号が画面内符号化されているか画面間符号化されているかを判定する符号化種別判定部と、
　前記符号化種別判定部で画面間符号化画像信号と判定した符号化画像信号にエントロピー復号処理を実施し、所定の単位で区切られた前記符号化画像信号の領域ごとの符号化情報を出力するエントロピー復号部と、
　前記符号化情報をもとに前記画面間符号化画像信号の動きの有無を判定する動き判定部と、
　前記動き判定部で動きがないと判定した前記画面間符号化画像信号を削除する画像削除部と、
　前記符号化種別判定部で画面内符号化画像信号と判定した符号化画像信号を再符号化するか否かを判定する画像再符号化判定部と、
　前記画像再符号化判定部にて再符号化すると判定した画面内符号化信号を復号する復号部と、
　前記復号部にて復号した復号画像信号を画面間符号化する符号化部と、
　を備えたことを特徴とするものである。 An image coding method conversion apparatus according to the present invention is
Coding for determining whether the coded image signal is intra-coded or inter-coded by inputting a coded image signal in which a plurality of intra-coded image signals and inter-coded image signals are combined. A type determination unit;
Entropy decoding processing is performed on the encoded image signal determined as the inter-frame encoded image signal by the encoding type determination unit, and encoding information for each region of the encoded image signal divided in predetermined units is output. An entropy decoding unit;
A motion determination unit that determines the presence or absence of motion of the inter-screen encoded image signal based on the encoding information;
An image deletion unit that deletes the inter-screen encoded image signal determined by the motion determination unit to have no motion;
An image re-encoding determination unit that determines whether or not to re-encode the encoded image signal determined as the intra-screen encoded image signal by the encoding type determination unit;
A decoding unit that decodes the intra-coded signal determined to be re-encoded by the image re-encoding determination unit;
An encoding unit for inter-coding the decoded image signal decoded by the decoding unit;
It is characterized by comprising.
　この発明によれば、符号化Ｐピクチャに対してエントロピー復号処理を実施するエントロピー復号部と、エントロピー復号部が出力する符号化情報から動きの有無を判定する動き判定部と、動き判定部で動きがないと判定した場合に、該当符号化Ｐピクチャを削除するピクチャ削除部と、符号化Ｉピクチャに後続する全ての符号化Ｐピクチャを削除した場合に、符号化Ｉピクチャの再符号化を判定するピクチャ再符号化判定部と、符号化Ｉピクチャを復号する画像信号復号部と、復号画像信号をＰピクチャに再符号化する画像信号符号化部とを備え、符号化Ｐピクチャに対してエントロピー復号のみで動きの有無判定ができ、符号化ＩピクチャをＰピクチャに再符号化するように構成したので、少ない計算量で再圧縮ができ、符号化画像信号のデータ量を低減することができる。 According to the present invention, an entropy decoding unit that performs entropy decoding processing on an encoded P picture, a motion determination unit that determines presence / absence of motion from encoded information output by the entropy decoding unit, If it is determined that there is no picture, the picture deleting unit that deletes the corresponding encoded P picture and the determination of re-encoding of the encoded I picture when all the encoded P pictures following the encoded I picture are deleted A picture re-encoding determination unit for decoding, an image signal decoding unit for decoding the encoded I picture, and an image signal encoding unit for re-encoding the decoded image signal into a P picture, and entropy for the encoded P picture Since it is possible to determine the presence or absence of motion only by decoding and re-encode the encoded I picture into the P picture, it can be re-compressed with a small amount of calculation, and the encoded image signal It is possible to reduce the amount of data.
この発明の実施の形態１に係る画像符号化装置の一例を示す構成図である。It is a block diagram which shows an example of the image coding apparatus which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る画像符号化装置の動き判定部１０３における動きの判定方法を説明するための図である。It is a figure for demonstrating the motion determination method in the motion determination part 103 of the image coding apparatus which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る画像符号化装置の動き判定を実施するピクチャの順序を示したものである。It shows the order of pictures for performing motion determination in the image coding apparatus according to Embodiment 1 of the present invention. この発明の実施の形態１に係る画像符号化装置の１ＧＯＰに対する処理のフローチャートを示すものである。2 is a flowchart of processing for 1 GOP of the image coding apparatus according to Embodiment 1 of the present invention; この発明の実施の形態１に係る画像符号化装置のＧＯＰに対する処理を実施した例を示すものである。The example which performed the process with respect to GOP of the image coding apparatus which concerns on Embodiment 1 of this invention is shown. この発明の実施の形態１に係る画像符号化装置のＧＯＰに対する処理を実施した例を示すものである。The example which performed the process with respect to GOP of the image coding apparatus which concerns on Embodiment 1 of this invention is shown.
　以下に、本発明に係る画像符号化方式変換装置及び画像符号化方式変換方法の実施の形態を図面に基づいて詳細に説明する。なお、この実施の形態によりこの発明が限定されるものではない。 Hereinafter, embodiments of an image coding method conversion apparatus and an image coding method conversion method according to the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.
実施の形態１．
　この発明の実施の形態１では、符号化Ｐ（Ｐｒｅｄｉｃｔｉｖｅ）ピクチャに対してエントロピー復号処理を実施するエントロピー復号部と、エントロピー復号部より出力される符号化情報から動きの有無を判定する動き判定部と、動き判定部で動きがないと判定された場合に、該当符号化Ｐピクチャを削除するピクチャ削除部と、符号化Ｉ（Ｉｎｔｒａ）ピクチャに後続する全ての符号化Ｐピクチャが削除された場合に、符号化Ｉピクチャの再符号化を判定するピクチャ再符号化判定部と、符号化Ｉピクチャを復号する画像信号復号部と、復号画像信号をＰピクチャに再符号化する画像信号符号化部と、を備え、符号化Ｐピクチャに対してエントロピー復号のみで動きの有無判定ができ、符号化ＩピクチャをＰピクチャに再符号化するように構成したので、少ない計算量で再圧縮ができ、符号化画像信号のデータ量を低減することができる画像符号化方式変換装置について説明する。 Embodiment 1 FIG.
In Embodiment 1 of the present invention, an entropy decoding unit that performs entropy decoding processing on an encoded P (Predictive) picture, and a motion determination unit that determines the presence or absence of motion from encoded information output from the entropy decoding unit When the motion determination unit determines that there is no motion, a picture deletion unit that deletes the corresponding encoded P picture and all the encoded P pictures that follow the encoded I (Intra) picture are deleted. A picture re-encoding determination unit for determining re-encoding of the encoded I picture, an image signal decoding unit for decoding the encoded I picture, and an image signal encoding unit for re-encoding the decoded image signal into a P picture It is possible to determine whether or not there is motion by only entropy decoding with respect to the encoded P picture, and re-encode the encoded I picture into the P picture. Since it is configured, it is re-compressed with a small amount of calculation, the image coding method conversion apparatus is described which can reduce the data amount of the encoded image signal.
　図１は、この発明の実施の形態１に係る画像符号化方式変換装置の一例を示す構成図である。図において、符号化種別判定部であるピクチャタイプ判別部１０１は入力符号化画像信号がＩピクチャであるかＰピクチャであるかを判定する。エントロピー復号部１０２は、ピクチャタイプ判別部１０１でＰピクチャと判定した符号化Ｐピクチャに対してエントロピー復号を実施し、符号化情報を出力する。動き判定部１０３は、エントロピー復号部が出力した符号化情報を用いて符号化Ｐピクチャの動きの有無を判定する。画像削除部であるピクチャ削除部１０４は、動き判定部１０３で動きがないと判定した場合に、符号化Ｐピクチャを削除するとともにピクチャ削除情報を出力する。 FIG. 1 is a block diagram showing an example of an image coding method conversion apparatus according to Embodiment 1 of the present invention. In the figure, a picture type determination unit 101 which is an encoding type determination unit determines whether an input encoded image signal is an I picture or a P picture. The entropy decoding unit 102 performs entropy decoding on the encoded P picture determined by the picture type determination unit 101 as a P picture, and outputs encoded information. The motion determination unit 103 determines the presence or absence of motion of the encoded P picture using the encoded information output from the entropy decoding unit. When the motion determination unit 103 determines that there is no motion, the picture deletion unit 104 that is an image deletion unit deletes the encoded P picture and outputs picture deletion information.
　画像再符号化判定部であるピクチャ再符号化判定部１０５は、ピクチャタイプ判別部１０１でＩピクチャと判定した場合、ピクチャ削除部１０４が出力するピクチャ削除情報をもとに符号化Ｉピクチャを再符号化するか否かの判定を行う。復号部である画像信号復号部１０６は、ピクチャ再符号化判定部１０５で再符号化すると判定した符号化Ｉピクチャを復号し、復号画像信号を出力する。符号化部である画像信号符号化部１０７は、画像信号復号部１０６が出力した、復号画像信号をピクチャバッファ１０８に蓄積した過去の復号画像信号を参照して画像符号化を行い、再符号化Ｐピクチャを出力する。ピクチャバッファ１０８は、画像信号復号部１０６が出力した復号画像信号を蓄積する。 A picture re-encoding determination unit 105, which is an image re-encoding determination unit, re-encodes an encoded I-picture based on the picture deletion information output by the picture deletion unit 104 when the picture type determination unit 101 determines that the picture is an I picture. It is determined whether or not to encode. The image signal decoding unit 106 serving as a decoding unit decodes the encoded I picture determined to be re-encoded by the picture re-encoding determination unit 105, and outputs a decoded image signal. The image signal encoding unit 107 which is an encoding unit performs image encoding with reference to the past decoded image signal output from the image signal decoding unit 106 and stored in the picture buffer 108, and re-encodes the image signal. P picture is output. The picture buffer 108 accumulates the decoded image signal output from the image signal decoding unit 106.
　図２は、動き判定部１０３における動きの判定方法を説明するための図である。符号化画像信号は、図に示すように１ピクチャがマクロブロックと呼ばれるブロック単位で分割されている。マクロブロックは例えば１６画素×１６ラインのブロックであり、マクロブロックごとに符号化情報を持っている。符号化情報には、量子化パラメータ、マクロブロックタイプ（ブロック分割種別を含む、図２の１６×１６、１６×８、８×１６、８×８）を持ち、さらに、イントラマクロブロックの場合は、イントラ予測モードを、インターマクロブロックの場合は、参照ピクチャ情報、動きベクトル（図２の矢印）を持つ。 FIG. 2 is a diagram for explaining a motion determination method in the motion determination unit 103. In the encoded image signal, as shown in the figure, one picture is divided into block units called macroblocks. The macro block is, for example, a block of 16 pixels × 16 lines, and has encoding information for each macro block. The encoding information has a quantization parameter and a macro block type (including 16 × 16, 16 × 8, 8 × 16, and 8 × 8 in FIG. 2 including a block division type). Further, in the case of an intra macroblock, In the case of the inter macroblock, the intra prediction mode has reference picture information and a motion vector (arrow in FIG. 2).
　動きベクトルはマクロブロックが参照ピクチャに対してどれだけ動いたかを示すものであり、例えば、ピクチャ内の動きベクトルの長さ（ノルム）の最大値が、ある任意の閾値を超えている場合に、動き判定部１０３は当該部分に動きがあると判定する。さらに、ピクチャ内の細かい動きをとらえるために、インターマクロブロックのブロック分割種別で１６×１６より小さいブロック（図２の１６×８、８×１６、８×８）が存在する場合には、動きベクトルの長さの最大値が上記の閾値よりも小さくても動きがあると判定する。 The motion vector indicates how much the macroblock has moved with respect to the reference picture. For example, when the maximum length (norm) of the motion vector in the picture exceeds an arbitrary threshold, The motion determination unit 103 determines that there is motion in the part. Furthermore, in order to capture fine motion in a picture, if there are blocks smaller than 16 × 16 (16 × 8, 8 × 16, 8 × 8 in FIG. 2) in the block division type of the inter macro block, the motion Even if the maximum vector length is smaller than the above threshold, it is determined that there is motion.
　図３は、動き判定部１０３が動き判定を実施するピクチャの順序を示したものである。図には２つのＧＯＰ（Ｇｒｏｕｐ　ｏｆ　Ｐｉｃｔｕｒｅｓ）が存在しており、処理の順番はＧＯＰ１の最終ピクチャであるＰ１－Ｎから始め、Ｐ１－（Ｎ－１）と遡って行き、ＧＯＰの先頭であるＩ１－１まで処理を実施した後に、ＧＯＰ２に移る。ＧＯＰ２でも同様に最終ピクチャであるＰ２－Ｎから遡って処理を実施していく。 FIG. 3 shows the order of pictures in which the motion determination unit 103 performs motion determination. In the figure, there are two GOPs (Group of Pictures), and the processing order starts from P1-N, which is the last picture of GOP1, goes back to P1- (N-1), and is the head of the GOP After performing the process up to I1-1, the process proceeds to GOP2. Similarly, in GOP2, processing is performed retroactively from P2-N which is the final picture.
　図４は、この発明の実施の形態１に係る１ＧＯＰに対する処理のフローチャートを示すものである。ピクチャタイプ判別部１０１は、入力されたピクチャがＩピクチャであるかＰピクチャであるかを判定する（ＳＴ１１）。Ｐピクチャであった場合、エントロピー復号部１０２は、エントロピー復号を実施し、符号化情報を出力する（ＳＴ１２）。動き判定部１０３はエントロピー復号部１０２が出力した符号化情報から動きの有無を判定する（ＳＴ１３）。動きがある場合は、処理を終了する。動きがない場合は、該当ピクチャを削除し（ＳＴ１４）、一つ前のピクチャの処理を開始する。全てのＰピクチャが削除され、ピクチャタイプ判別部１０１にてＩピクチャと判定された場合は、直前のＧＯＰにおいて先頭ピクチャ以外のピクチャを削除しているか否かを確認し（ＳＴ１５）、削除している場合は、ＩピクチャをＰピクチャに再変換する処理を実施する（ＳＴ１６）。削除していない場合は、再変換は実施せず処理を終了する。 FIG. 4 shows a flowchart of processing for 1 GOP according to Embodiment 1 of the present invention. The picture type determination unit 101 determines whether the input picture is an I picture or a P picture (ST11). When it is a P picture, the entropy decoding unit 102 performs entropy decoding and outputs encoded information (ST12). The motion determination unit 103 determines the presence or absence of motion from the encoded information output by the entropy decoding unit 102 (ST13). If there is movement, the process is terminated. If there is no motion, the corresponding picture is deleted (ST14), and processing of the previous picture is started. If all P pictures are deleted and the picture type discriminating unit 101 determines that the picture is an I picture, it is confirmed whether or not a picture other than the top picture has been deleted in the immediately preceding GOP (ST15). If yes, a process of reconverting the I picture into the P picture is performed (ST16). If not deleted, the re-conversion is not performed and the process is terminated.
　図５は、ＧＯＰ１の先頭ピクチャ以外を削除して、ＧＯＰ２の処理を実施した例を示すものである。図５において、実線で囲まれたピクチャは削除されていないピクチャを表し、点線で囲まれたピクチャは削除されたピクチャを表している。ＧＯＰ２において全てのＰピクチャで動きがないと判定した場合、Ｉピクチャを直前のＧＯＰ１の先頭ピクチャを参照するＰピクチャへと再変換する。 FIG. 5 shows an example in which processing other than the top picture of GOP1 is deleted and GOP2 is processed. In FIG. 5, a picture surrounded by a solid line represents a picture that has not been deleted, and a picture surrounded by a dotted line represents a deleted picture. When it is determined that there is no motion in all P pictures in GOP2, the I picture is reconverted into a P picture that refers to the first picture in the immediately preceding GOP1.
　図６は、ＧＯＰ１の先頭ピクチャと２番目のピクチャ以外削除して、ＧＯＰ２の処理を実施した例を示すものである。図５と同様に、削除されていないピクチャと削除されたピクチャを、実線および点線とで表している。ＧＯＰ２において全てのＰピクチャで動きがないと判定した場合でも、直前のＧＯＰ１に２つのピクチャが残っているため、Ｉピクチャの再変換は実施しない。 FIG. 6 shows an example in which processing other than the first picture and the second picture of GOP1 is deleted and GOP2 processing is performed. As in FIG. 5, the undeleted picture and the deleted picture are represented by solid lines and dotted lines. Even when it is determined that there is no motion in all P pictures in GOP2, since two pictures remain in the immediately preceding GOP1, re-conversion of the I picture is not performed.
　なお、この実施の形態１では、動きの有無を動きベクトルの長さの最大値とインターマクロブロックのブロック種別を用いて判定する場合を説明したが、エントロピー復号によって得られる他の符号化情報を用いて判定するように構成してもよい。 In the first embodiment, the case where the presence / absence of motion is determined using the maximum value of the length of the motion vector and the block type of the inter-macroblock has been described. However, other encoded information obtained by entropy decoding is used. You may comprise so that it may determine using.
　また、この実施の形態１では、ＩピクチャとＰピクチャのみで構成されたＧＯＰについての処理を説明したが、Ｂ（Ｂｉｄｉｒｅｃｔｉｏｎａｌｌｙ　Ｐｒｅｄｉｃｔｉｖｅ）ピクチャも符号化情報内に動き情報を含んでいるため、Ｂピクチャを含んだＧＯＰに対して実施するように構成してもよい。 Further, in the first embodiment, the processing for the GOP composed only of the I picture and the P picture has been described. However, since the B (Bidirectionally Predictive) picture also includes motion information in the encoded information, the B picture You may comprise so that it may implement with respect to GOP containing.
　この場合、Ｂピクチャであっても、ピクチャ間の参照順序を考慮したうえでＰピクチャと同様の処理を行なうことができる。 In this case, even a B picture can be processed in the same manner as a P picture in consideration of the reference order between pictures.
　以上のように、この実施の形態１に係る画像符号化方式変換装置によれば、符号化Ｐピクチャに対してエントロピー復号処理を実施するエントロピー復号部と、エントロピー復号部が出力する符号化情報から動きの有無を判定する動き判定部と、動き判定部で動きがないと判定した場合に、該当符号化Ｐピクチャを削除するピクチャ削除部と、符号化Ｉピクチャに後続する全ての符号化Ｐピクチャを削除した場合に、符号化Ｉピクチャの再符号化を判定するピクチャ再符号化判定部と、符号化Ｉピクチャを復号する画像信号復号部と、復号画像信号をＰピクチャに再符号化する画像信号符号化部とを備え、符号化Ｐピクチャに対してエントロピー復号のみで動きの有無判定ができ、符号化ＩピクチャをＰピクチャに再符号化するように構成したので、少ない計算量で再圧縮ができ、符号化画像信号のデータ量を低減することができる。 As described above, according to the image coding method conversion apparatus according to the first embodiment, the entropy decoding unit that performs the entropy decoding process on the encoded P picture, and the encoding information output from the entropy decoding unit A motion determination unit that determines the presence or absence of motion, a picture deletion unit that deletes the corresponding encoded P picture when the motion determination unit determines that there is no motion, and all the encoded P pictures that follow the encoded I picture A picture re-encoding determination unit that determines re-encoding of an encoded I picture, an image signal decoding unit that decodes the encoded I picture, and an image that re-encodes the decoded image signal into a P picture And a signal encoding unit, configured to determine whether or not there is motion by only entropy decoding for the encoded P picture, and re-encode the encoded I picture to the P picture Since, it is re-compressed with a small amount of calculation, it is possible to reduce the data amount of the encoded image signal.
　以上のように、本発明にかかる画像符号化方式変換装置は、符号化された画像信号を再符号化する画像符号化方式変換装置として適用できる。 As described above, the image coding system conversion apparatus according to the present invention can be applied as an image coding system conversion apparatus that re-encodes an encoded image signal.
　１０１　ピクチャタイプ判別部、１０２　エントロピー復号部、１０３　動き判定部、１０４　ピクチャ削除部、１０５　ピクチャ再符号化判定部、１０６　画像信号復号部、１０７　画像信号符号化部、１０８　ピクチャバッファ 101 picture type determination unit, 102 entropy decoding unit, 103 motion determination unit, 104 picture deletion unit, 105 picture re-encoding determination unit, 106 image signal decoding unit, 107 image signal encoding unit, 108 picture buffer

Claims (6)

  1. 　画面内符号化画像信号と画面間符号化画像信号が複数まとまった符号化画像信号を入力し、前記符号化画像信号が画面内符号化されているか画面間符号化されているかを判定する符号化種別判定部と、
    　前記符号化種別判定部で画面間符号化画像信号と判定した符号化画像信号にエントロピー復号処理を実施し、所定の単位で区切られた前記符号化画像信号の領域ごとの符号化情報を出力するエントロピー復号部と、
    　前記符号化情報をもとに前記画面間符号化画像信号の動きの有無を判定する動き判定部と、
    　前記動き判定部で動きがないと判定した前記画面間符号化画像信号を削除する画像削除部と、
    　前記符号化種別判定部で画面内符号化画像信号と判定した符号化画像信号を再符号化するか否かを判定する画像再符号化判定部と、
    　前記画像再符号化判定部にて再符号化すると判定した画面内符号化信号を復号する復号部と、
    　前記復号部にて復号した復号画像信号を画面間符号化する符号化部と、
    　を備えたことを特徴とする画像符号化方式変換装置。     Coding for determining whether the coded image signal is intra-coded or inter-coded by inputting a coded image signal in which a plurality of intra-coded image signals and inter-coded image signals are combined. A type determination unit;
    Entropy decoding processing is performed on the encoded image signal determined as the inter-frame encoded image signal by the encoding type determination unit, and encoding information for each region of the encoded image signal divided in predetermined units is output. An entropy decoding unit;
    A motion determination unit that determines the presence or absence of motion of the inter-screen encoded image signal based on the encoding information;
    An image deletion unit that deletes the inter-screen encoded image signal determined by the motion determination unit to have no motion;
    An image re-encoding determination unit that determines whether or not to re-encode the encoded image signal determined as the intra-screen encoded image signal by the encoding type determination unit;
    A decoding unit that decodes the intra-coded signal determined to be re-encoded by the image re-encoding determination unit;
    An encoding unit for inter-coding the decoded image signal decoded by the decoding unit;
    An image coding method conversion apparatus comprising:
  2. 　前記動き判定部は、
    　前記符号化情報のうち決められた単位で区切られた領域ごとの動きを示す情報をもとに動きの有無を判定する
    　ことを特徴とする請求項１に記載の画像符号化方式変換装置。     The movement determination unit
    The image coding method conversion apparatus according to claim 1, wherein the presence / absence of motion is determined based on information indicating motion for each area divided by a predetermined unit in the coded information.
  3. 　前記動き判定部は、
    　前記符号化情報のうち決められた単位で区切られた領域ごとの領域内のさらなる分割単位をもとに動きの有無を判定する
    　ことを特徴とする請求項１または請求項２に記載の画像符号化方式変換装置。     The movement determination unit
    3. The image code according to claim 1, wherein presence / absence of motion is determined based on a further division unit in each area divided by a predetermined unit in the encoded information. Conversion method converter.
  4. 　前記動き判定部は、
    　前記符号化情報のうち決められた単位で区切られた領域ごとの情報量をもとに動きの有無を判定する
    　ことを特徴とする請求項１から請求項３のいずれか一項に記載の画像符号化方式変換装置。     The movement determination unit
    The image according to any one of claims 1 to 3, wherein the presence or absence of motion is determined based on an information amount for each area divided by a predetermined unit in the encoded information. Encoding method converter.
  5. 　前記画像再符号化判定部は、
    　前記動き判定部にて全ての画面間符号化信号に動きがないと判定した場合に再符号化をすると判定する
    　ことを特徴とする請求項１から請求項４のいずれか一項に記載の画像符号化方式変換装置。     The image re-encoding determination unit
    5. The image according to claim 1, wherein re-encoding is determined when it is determined that all the inter-frame encoded signals have no motion in the motion determination unit. Encoding method converter.
  6. 　画面内符号化画像信号と画面間符号化画像信号が複数まとまった符号化画像信号を入力し、前記符号化画像信号が画面内符号化されているか画面間符号化されているかを判定する符号化種別判定ステップと、
    　前記符号化種別判定ステップで画面間符号化画像信号と判定した符号化画像信号にエントロピー復号処理を実施し、所定の単位で区切られた前記符号化画像信号の領域ごとの符号化情報を出力するエントロピー復号ステップと、
    　前記符号化情報をもとに前記画面間符号化画像信号の動きの有無を判定する動き判定ステップと、
    　前記動き判定ステップで動きがないと判定した前記画面間符号化画像信号を削除する画像削除ステップと、
    　前記符号化種別判定ステップで画面内符号化画像信号と判定した符号化画像信号を再符号化するか否かを判定する画像再符号化判定ステップと、
    　前記画像再符号化判定ステップにて再符号化すると判定した画面内符号化信号を復号する復号ステップと、
    　前記復号ステップにて復号した復号画像信号を画面間符号化する符号化ステップと、
    　を備えたことを特徴とする画像符号化方式変換方法。     Coding for determining whether the coded image signal is intra-coded or inter-coded by inputting a coded image signal in which a plurality of intra-coded image signals and inter-coded image signals are combined. A type determination step;
    Entropy decoding processing is performed on the encoded image signal determined as the inter-frame encoded image signal in the encoding type determining step, and encoding information for each area of the encoded image signal divided in predetermined units is output. An entropy decoding step;
    A motion determination step for determining presence or absence of motion of the inter-screen encoded image signal based on the encoding information;
    An image deletion step of deleting the inter-screen encoded image signal determined to have no motion in the motion determination step;
    An image re-encoding determination step for determining whether or not to re-encode the encoded image signal determined as the intra-screen encoded image signal in the encoding type determination step;
    A decoding step of decoding the intra-coded signal determined to be re-encoded in the image re-encoding determination step;
    An encoding step of inter-coding the decoded image signal decoded in the decoding step;
    An image coding method conversion method characterized by comprising:
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