WO2022110870A1 - Procédé de codage et de décodage d'images, appareil de codage et de décodage, codeur et décodeur - Google Patents

Procédé de codage et de décodage d'images, appareil de codage et de décodage, codeur et décodeur Download PDF

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WO2022110870A1
WO2022110870A1 PCT/CN2021/109724 CN2021109724W WO2022110870A1 WO 2022110870 A1 WO2022110870 A1 WO 2022110870A1 CN 2021109724 W CN2021109724 W CN 2021109724W WO 2022110870 A1 WO2022110870 A1 WO 2022110870A1
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Prior art keywords
image
standard
image data
encoded
standard image
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PCT/CN2021/109724
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English (en)
Chinese (zh)
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罗伟节
刘星宇
滕波
任鹏
张峰
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浙江智慧视频安防创新中心有限公司
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Publication of WO2022110870A1 publication Critical patent/WO2022110870A1/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
    • H04N19/176—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 block, e.g. a macroblock
    • 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
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/513—Processing of motion vectors
    • 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 present invention relates to the field of computer technology, and in particular, to an image encoding and decoding method, an encoding and decoding device, an encoder and a decoder.
  • Predictive coding is widely used in various video codec standards, including MPEG2, MPEG4, H.264, H.265/HEVC, H.266/VCC, etc.
  • an image encoding and decoding method an encoding and decoding device, an image encoding and decoding method, an encoding and decoding device, and an image encoding and decoding method, an encoding and decoding device, an encoding method, coder and decoder.
  • an embodiment of the present application provides an image coding processing method, the method comprising:
  • the current image is encoded to obtain encoded image data, so as to send the encoded image data to a decoder for image decoding, where the encoded image data is It carries the serial number information of the standard image.
  • the method before the identifying the standard image with the preset compression mode from the current image, the method further includes:
  • a standard image library including multiple standard images is established, wherein each standard image has a corresponding preset compression mode.
  • the standard image includes at least one of the following:
  • Standard images consisting of characters in any standard font, standard images including expressions, dynamic standard images consisting of animations, and any standard images with independent image elements.
  • the serial number of the standard image is generated by using a message digest algorithm, or the serial number of the standard image is generated by using a cyclic redundancy check algorithm.
  • the first encoding block in the same image frame, there is at least one first encoding block, the first encoding block can support the preset encoding mode of the standard image, and there is at least one second encoding block, the The second coding block can support any one of the inter-frame coding mode, the intra-frame coding mode, and the inter-frame and intra-frame joint coding mode.
  • an embodiment of the present application provides an image decoding processing method, the method comprising:
  • an embodiment of the present application provides an image encoding processing apparatus, the apparatus comprising:
  • an acquisition unit for extracting the current image to be encoded from the image data
  • an identification unit configured to identify a standard image with a preset compression mode from the current image acquired by the acquisition unit
  • a calculation unit configured to use the standard image identified by the identification unit as a reference frame to calculate a motion vector and a prediction residual;
  • an encoding unit configured to encode the current image according to the motion vector and the prediction residual calculated by the calculating unit to obtain encoded image data, so as to send the encoded image data to a decoder Image decoding is performed, and the encoded image data carries the serial number information of the standard image.
  • an embodiment of the present application provides an image decoding processing apparatus, the apparatus comprising:
  • an acquisition unit for acquiring a video stream including the encoded image data
  • an extraction unit configured to extract the number of the standard image, the prediction residual between the current image and the standard image, and the first image data corresponding to the non-standard image area in the current image from the video code stream acquired by the acquiring unit;
  • a decoding unit configured to restore second image data corresponding to the standard image according to the number of the standard image and the prediction residual extracted by the extracting unit;
  • an embodiment of the present application provides an encoder, including the above image encoding processing apparatus.
  • an embodiment of the present application provides a decoder, including the above-mentioned image decoding processing apparatus.
  • the current image to be encoded is extracted from the image data; the standard image with the preset compression mode is identified from the current image; the standard image is used as a reference frame, the motion vector and the prediction residual are calculated; and prediction residuals, encode the current image to obtain encoded image data, and send the encoded image data to the decoder for image decoding.
  • the image encoding processing method provided by the embodiment of the present disclosure can use a standard image as a reference frame, calculate a motion vector and a prediction residual, and encode the current image according to the motion vector and the prediction residual, so as to obtain more abundant encoded image data , in addition, the encoded image data carries the serial number information of the standard image, so that the standard image can be accurately positioned according to the serial number information.
  • FIG. 1 is a schematic flowchart of an image encoding processing method provided by an embodiment of the present disclosure
  • FIG. 2 is a schematic flowchart of an image decoding processing method provided by an embodiment of the present disclosure
  • FIG. 3 is a schematic structural diagram of an image encoding processing apparatus provided by an embodiment of the present disclosure.
  • FIG. 4 is a schematic structural diagram of an image decoding processing apparatus provided by an embodiment of the present disclosure.
  • FIG. 5 is a structural block diagram of an encoder provided by an embodiment of the present disclosure.
  • FIG. 6 is a structural block diagram of a decoder provided by an embodiment of the present disclosure.
  • an embodiment of the present disclosure provides a schematic flowchart of an image encoding processing method, which is applied to a server and specifically includes the following method steps:
  • the image data may be acquired from an image library, or the image data may also be extracted from a video code stream, and the manner of acquiring the image data is not specifically limited herein.
  • the standard image includes at least one of the following:
  • Standard images consisting of characters in any standard font, standard images including expressions, dynamic standard images consisting of animations, and any standard images with independent image elements.
  • the standard image closest to the standard image database is used as the reference image, and the identified target image is compared with the standard image, and the motion vector and the residual value are calculated.
  • the above process can still adopt a block-based prediction method, and use the absolute value difference and the average absolute value difference to measure the degree of difference between the predicted value and the actual value.
  • the motion vector is (x1-x2, y1-y2).
  • the reference picture is no longer an I frame, but a picture in the standard database.
  • the subsequent transformation, quantization, and entropy coding can be processed by using the prior art, which is not repeated here.
  • S108 Encode the current image according to the motion vector and the prediction residual to obtain encoded image data, so as to send the encoded image data to the decoder for image decoding, and the encoded image data carries the serial number of the standard image information; since the encoded image data carries the serial number information of the standard image, in this way, the standard image can be accurately positioned according to the serial number information.
  • the reference image is not only stored in the encoder, but also stored in the decoder, and does not need to be transmitted through a part of the video encoding code stream. Therefore, the encoder needs to indicate to the decoder the number of the standard picture adopted in some way.
  • the serial number of the standard image is generated by the message digest algorithm, or the serial number of the standard image is generated by using the cyclic redundancy check algorithm, and the serial number of the standard image is used as a method for uniquely identifying the standard image.
  • Both the message digest algorithm and the cyclic redundancy check algorithm are conventional algorithms, which will not be repeated here.
  • All or part of the number of the standard image will be encoded into the video stream, received by the decoding end, and uniquely determined as one in the standard image database.
  • the first encoding block in the same image frame, there is at least one first encoding block, the first encoding block can support the preset encoding mode of the standard image, and there is at least one second encoding block, the second encoding block can support Any encoding method among the inter-frame encoding method, the intra-frame encoding method, and the inter-frame and intra-frame joint encoding method; in this way, it can effectively ensure that the final encoded image data is more abundant, which is beneficial to the encoding of the encoded image data.
  • the standard images in are decoded efficiently.
  • the image coding mode of the area unrelated to the standard image may be inter-frame, intra-frame,
  • the prediction residual data is generated by means of inter-frame and intra-frame joint coding, and is converted into a video stream after transformation, quantization, entropy coding and other processing procedures.
  • the standard image and other image information together constitute an image frame.
  • the image frame is generally a rectangle.
  • the image data is often compressed in advance.
  • standard images may exist at both the sender and the receiver, in order to further save the transmission bandwidth, when transmitting image data, it is not necessary to transmit the complete standard image data, only the images that are not available at the receiving end are transmitted. data.
  • the decoding end device may also send a part of the supported formats or all supported formats of the standard image database that the encoding end can support to the encoding end through signaling before encoding the image; in this way, , which can effectively improve the efficiency of image coding processing.
  • the object detection function of the object detection unit is activated, and the object detection unit uses a target detection algorithm to determine whether the image frame contains an image of interest.
  • the image of interest is an image that is highly matched with at least one standard image in the standard image database. All standard images in the standard image database can exist in both the encoder and the decoder.
  • the object detection unit may adopt various target detection algorithms, for example, Fast RCNN, Faster-RCNN, Mask RCNN, R-FCN and FPN, etc. Based on the above-mentioned target detection algorithms are all conventional target detection algorithms, in This will not be repeated here.
  • an image frame needs to be divided into several basic coding units, eg, an image frame to be processed is divided into several coding units.
  • the object detection process can be performed within the coding block. If no standard image of interest is detected in the coding block, it is processed in a conventional video coding manner, for example, it can be performed in a manner specified by standards such as H.264, H.265/HEVC, and H.266/VVC. If there is at least one object image data that is sufficiently similar to at least one standard image in the standard image database, the image encoding method provided by the embodiment of the present application continues to be used for encoding processing.
  • Whether the object image data is sufficiently similar to at least one standard image in the standard image database can be measured by ssd, sad, mse, and psnr. As long as a certain threshold is exceeded, the above two are considered to be sufficiently similar.
  • the measurement methods based on the above-mentioned ssd, sad, mse, and psnr are all conventional methods, and will not be repeated here.
  • the standard image may also need to be scaled until the two are the same size, and then the two are compared.
  • the image encoding processing method provided by the embodiment of the present application can not only perform encoding processing on images in an image library, but also can extract images from a video to perform encoding processing on image data.
  • the current image to be encoded is extracted from the image data; the standard image with the preset compression mode is identified from the current image; the standard image is used as a reference frame, the motion vector and the prediction residual are calculated; and prediction residuals, encode the current image to obtain encoded image data, and send the encoded image data to the decoder for image decoding.
  • the image encoding processing method provided by the embodiment of the present disclosure can use a standard image as a reference frame, calculate a motion vector and a prediction residual, and encode the current image according to the motion vector and the prediction residual, so as to obtain more abundant encoded image data ,
  • the encoded image data carries the serial number information of the standard image, so that the standard image can be accurately positioned according to the serial number information.
  • an embodiment of the present disclosure provides a schematic flowchart of an image decoding processing method, which is applied to a server and specifically includes the following method steps:
  • the video code stream includes at least the serial number of the standard image, the prediction residual between the current image and the standard image, and the first image data corresponding to the non-standard image area in the current image.
  • S204 Extract the serial number of the standard image, the prediction residual between the current image and the standard image, and the first image data corresponding to the non-standard image area in the current image from the video code stream.
  • the standard image includes at least one of the following:
  • Standard images consisting of characters in any standard font, standard images including expressions, dynamic standard images consisting of animations, and any standard images with independent image elements.
  • the number of the standard image is generated by using the message digest algorithm, or,
  • the number of the standard image is generated using the cyclic redundancy check algorithm.
  • the first decoding block in the same image frame, there is at least one first decoding block, and the first decoding block can support a preset decoding mode of a standard image.
  • S208 Restore the processed image embedded in the high-resolution standard image according to the first image data and the second image data; in this way, the finally restored processed image not only includes the embedded high-resolution standard image, but also includes the embedded high-resolution standard image.
  • the decoding end after receiving all or part of the standard image numbers from the video code stream, the decoding end uniquely determines a standard image in the standard image database. After entropy decoding, inverse transformation, inverse quantization and other processing, the standard image residual is obtained.
  • the above-mentioned processing methods such as entropy decoding, inverse transformation, and inverse quantization are all conventional processing methods, and will not be repeated here.
  • a standard image in the uniquely determined standard image database is used as a reference image, and the image of this part of the area related to the standard image is restored.
  • the data of other regions obtained after entropy decoding, inverse transformation, inverse quantization, etc. can be reconstructed in the manner specified by H.264, H.265/HEVC, H.266/VVC and other standards; in this way,
  • the final restored processed image not only includes the embedded high-resolution standard image, but also includes the high-resolution image restored from the first image data in the non-standard image area.
  • the second decoding block in the same image frame, there is at least one second decoding block, and the second decoding block can support any decoding among the inter-frame decoding mode, the intra-frame decoding mode, and the inter-frame and intra-frame joint decoding mode Way.
  • the method before extracting the number of the standard image, the prediction residual between the current image and the standard image, and the first image data corresponding to the non-standard image area in the current image from the video code stream, the method also includes:
  • a standard image library including multiple standard images is established, wherein each standard image has a corresponding preset compression mode.
  • the decoder device in order to effectively improve the efficiency of image decoding processing, in a real-time video communication environment, can also send all standard images in the standard image database that it can support to the encoder through signaling. Or part of a standard image.
  • FIG. 3 shows a schematic structural diagram of an image coding processing apparatus provided by an exemplary embodiment of the present invention.
  • the image encoding processing device 30 can be implemented as all or a part of the terminal through software, hardware or a combination of the two.
  • the image encoding processing device 30 includes an acquisition unit 302, an identification unit 304, a calculation unit 306 and an encoding unit 308;
  • the obtaining unit 302 is used to extract the current image to be encoded from the image data
  • an identification unit 304 configured to identify a standard image with a preset compression mode from the current image acquired by the acquisition unit 302;
  • the calculation unit 306 is used to calculate the motion vector and the prediction residual with the standard image identified by the identification unit 304 as the reference frame;
  • the encoding unit 308 is configured to encode the current image according to the motion vector and the prediction residual calculated by the calculating unit 306 to obtain encoded image data, so as to send the encoded image data to the decoder for image decoding, and after encoding
  • the image data of the standard image carries the serial number information of the standard image.
  • the device further includes:
  • a standard image library establishment unit (not shown in FIG. 3 ) is used to establish a standard image library including a variety of standard images before the identification unit 304 identifies a standard image with a preset compression mode from the current image, wherein each A standard image has a corresponding preset compression method.
  • the standard image includes at least one of the following:
  • Standard images consisting of characters in any standard font, standard images including expressions, dynamic standard images consisting of animations, and any standard images with independent image elements.
  • the number of the standard image is generated by using a message digest algorithm, or the number of the standard image is generated by using a cyclic redundancy check algorithm.
  • first coding block which can support the preset coding mode of standard images
  • second coding block which can support inter-frame coding. mode, intra-frame coding mode, and inter-frame and intra-frame joint coding mode.
  • the image coding processing apparatus when the image coding processing apparatus provided in the above embodiments executes the image coding processing method, only the division of the above functional units is used as an example for illustration. In practical applications, the above functions may be allocated to different functions as required Unit completion means dividing the internal structure of the device into different functional units to complete all or part of the functions described above.
  • the image encoding processing apparatus and the image encoding processing method embodiments provided by the above embodiments belong to the same concept, and the implementation process of the image encoding processing method is described in the image encoding processing method embodiments, which will not be repeated here.
  • the acquisition unit is used to extract the current image to be encoded from the image data;
  • the recognition unit is used to recognize the standard image with a preset compression method from the current image acquired by the acquisition unit;
  • the calculation unit uses the recognition unit to recognize The obtained standard image is used as a reference frame, and the motion vector and the prediction residual are calculated; and
  • the coding unit encodes the current image according to the motion vector and the prediction residual calculated by the calculation unit, and obtains the encoded image data to convert the encoded image data.
  • the image data is sent to the decoder for image decoding.
  • the image encoding processing apparatus can use a standard image as a reference frame, calculate a motion vector and a prediction residual, and encode the current image according to the motion vector and the prediction residual, so as to obtain more abundant encoded image data .
  • the encoded image data carries the serial number information of the standard image, so that the standard image can be accurately positioned according to the serial number information.
  • FIG. 4 it is a schematic structural diagram of an image decoding processing apparatus provided by an embodiment of the present disclosure.
  • the image decoding processing apparatus 40 can be implemented as all or a part of the terminal through software, hardware or a combination of the two.
  • the image decoding processing device 40 includes an acquisition unit 402, an extraction unit 404 and a decoding unit 406;
  • the obtaining unit 402 is used to obtain a video code stream including the encoded image data
  • the extraction unit 404 is used to extract the number of the standard image, the prediction residual of the current image and the standard image and the first image data corresponding to the non-standard image area in the current image from the video code stream acquired by the acquisition unit 402;
  • a decoding unit 406 configured to restore the second image data corresponding to the standard image according to the number of the standard image and the prediction residual extracted by the extracting unit 404;
  • the processed image embedded in the high-resolution standard image is restored.
  • the device further includes:
  • the standard image library establishment unit (not shown in FIG. 4 ) is used to extract the number of the standard image, the prediction residual between the current image and the standard image, and the non-standard image area in the current image from the video code stream in the extracting unit 404 Before the corresponding first image data, a standard image library including multiple standard images is established, wherein each standard image has a corresponding preset compression mode.
  • the standard image includes at least one of the following:
  • Standard images consisting of characters in any standard font, standard images including expressions, dynamic standard images consisting of animations, and any standard images with independent image elements.
  • the number of the standard image is generated by using a message digest algorithm, or the number of the standard image is generated by using a cyclic redundancy check algorithm.
  • At least one first decoding block which can support the preset decoding mode of standard images
  • at least one second decoding block which can support inter-frame decoding.
  • the image decoding processing apparatus when the image decoding processing apparatus provided in the above embodiments executes the image decoding processing method, only the division of the above functional units is used as an example for illustration. In practical applications, the above functions may be allocated to different functions as required Unit completion means dividing the internal structure of the device into different functional units to complete all or part of the functions described above.
  • the image decoding processing apparatus and the image decoding processing method provided in the above embodiments belong to the same concept, and the implementation process of the image decoding processing method is described in detail in the image decoding processing method embodiment, which will not be repeated here.
  • the decoding unit is configured to restore the second image data corresponding to the standard image according to the number of the standard image and the prediction residual extracted by the extracting unit; and according to the first image data and the second image data extracted by the extracting unit Image data to recover a processed image embedded with a high-resolution standard image.
  • the processed image finally recovered includes not only an embedded high-resolution standard image, but also a high-resolution image recovered from the first image data in the non-standard image area.
  • FIG. 5 is a structural block diagram of an encoder according to an embodiment of the present invention. As shown in FIG. 5 , the encoder 50 includes the image encoding processing apparatus 30 according to any one of the above.
  • FIG. 6 is a structural block diagram of a decoder according to an embodiment of the present invention. As shown in FIG. 6 , the decoder 60 includes the image decoding processing apparatus 40 according to any one of the above.
  • An electronic device is also provided in an embodiment of the present invention, and the electronic device includes an encoding processing device (eg, the aforementioned encoder 50 ) and/or a decoding processing device (eg, the aforementioned decoder 60 ).
  • an encoding processing device eg, the aforementioned encoder 50
  • a decoding processing device eg, the aforementioned decoder 60
  • the above encoding processing device can use, for example, an implementation method of the aforementioned encoding processing device to process the HDR video (ie, the input original HDR video) to generate an HDR video code stream or a transport stream including an HDR video code stream or media files.
  • the above-mentioned decoding processing device can use, for example, the implementation method of the foregoing decoding processing device to process an HDR video stream, or a transport stream or media file containing an HDR video stream, to generate an HDR restored video suitable for playback.
  • the electronic devices in this embodiment may be related code stream generating devices and receiving and playing devices in video communication applications, such as mobile phones, computers, servers, set-top boxes, portable mobile terminals, digital cameras, television broadcasting system devices, and the like.
  • the above-mentioned units can be implemented by software or hardware, and the latter can be implemented in the following ways, but not limited to this: the above-mentioned units are all located in the same processor; or, the above-mentioned units are located in multiple in the processor.
  • Embodiments of the present invention also provide a storage medium.
  • the above-mentioned storage medium may be configured to store program codes for executing the following steps:
  • the current image is encoded to obtain encoded image data, and the encoded image data is sent to the decoder for image decoding.
  • the encoded image data carries the serial number information of the standard image.
  • the above-mentioned storage medium may include but is not limited to: a USB flash drive, a read-only memory (Read-Only Memory, referred to as ROM), a random access memory (Random Access Memory, referred to as RAM), Various media that can store program codes, such as removable hard disks, magnetic disks, or optical disks.
  • ROM Read-Only Memory
  • RAM Random Access Memory
  • the processor executes the steps in the foregoing method embodiments according to program codes stored in the storage medium.
  • the above-mentioned units or steps of the present invention can be implemented by a general-purpose computing device, and they can be centralized on a single computing device or distributed in a network composed of multiple computing devices Alternatively, they may be implemented in program code executable by a computing device, such that they may be stored in a storage device and executed by the computing device, and in some cases, in a different order than here
  • the steps shown or described are performed either by fabricating them separately as individual integrated circuit units, or by fabricating multiple units or steps of them into a single integrated circuit unit. As such, the present invention is not limited to any particular combination of hardware and software.

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Abstract

L'invention concerne un procédé de codage et de décodage d'image, un appareil de codage et de décodage, un codeur et un décodeur. Le procédé de codage d'image consiste à : extraire, à partir de données d'image, une image actuelle à coder ; identifier, à partir de l'image actuelle, une image standard ayant un mode de compression prédéfini ; calculer un vecteur de mouvement et un résidu prédit à l'aide de l'image standard en tant que trame de référence ; et coder l'image actuelle selon le vecteur de mouvement et le résidu prédit pour obtenir des données d'image codées, de façon à envoyer les données d'image codées à un décodeur pour un décodage d'image. Au moyen du procédé de codage d'image décrit dans les modes de réalisation de la présente divulgation, un vecteur de mouvement et un résidu prédit peuvent être calculés à l'aide d'une image standard en tant que trame de référence, et une image actuelle est codée selon le vecteur de mouvement et le résidu prédit pour obtenir des données d'image codées plus enrichies. De plus, les données d'image codées portent des informations de numéro de série de l'image standard, de telle sorte que l'image standard puisse être positionnée avec précision en fonction des informations de numéro de série.
PCT/CN2021/109724 2020-11-27 2021-07-30 Procédé de codage et de décodage d'images, appareil de codage et de décodage, codeur et décodeur WO2022110870A1 (fr)

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