WO2010079797A1 - 画像変換装置と方法及びプログラム - Google Patents
画像変換装置と方法及びプログラム Download PDFInfo
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- WO2010079797A1 WO2010079797A1 PCT/JP2010/050083 JP2010050083W WO2010079797A1 WO 2010079797 A1 WO2010079797 A1 WO 2010079797A1 JP 2010050083 W JP2010050083 W JP 2010050083W WO 2010079797 A1 WO2010079797 A1 WO 2010079797A1
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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
- H04N19/189—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
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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
- H04N19/189—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
- H04N19/198—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 including smoothing of a sequence of encoding parameters, e.g. by averaging, by choice of the maximum, minimum or median value
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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
- H04N19/40—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
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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
- H04N19/50—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
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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
- H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
- H04N19/59—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
Definitions
- the present invention is based on the priority claim of Japanese Patent Application No. 2009-002989 (filed on Jan. 8, 2009), the entire contents of which are incorporated herein by reference. Shall.
- the present invention relates to an image conversion technique, and more particularly to an image conversion method, apparatus, and program suitable for application to an apparatus that performs re-encoding when converting the size of an encoded moving image compression-encoded bitstream.
- ITU-T International Telecommunication Standardization Sector
- H. ITU-T International Telecommunication Standardization Sector
- MPEG-4 Moving Picture Expert Group Phase 4
- ISO / IEC International Organization for Standardization / International Electrotechnical Commission
- H.264 has been internationally standardized by ITU-T and ISO / IEC.
- H.264 / MPEG-4 AVC Advanced Video Coding
- DCT Discrete Cosine Transform
- DIT Discrete Integral Transform
- inter prediction when an input image frame is encoded, a motion compensation prediction is performed between decoded pixels of past and future frames to obtain a prediction residual signal, and DCT or DIT is performed on the prediction residual signal. Then, motion vectors, DCT coefficients, etc. are variable length encoded.
- the network bandwidth of the connection destination is different, especially when the bandwidth becomes narrow, it is necessary to suppress the bit rate of the encoded data. If the bit rate is simply suppressed, the image quality deteriorates, so it is necessary to consider keeping the code amount for each block in the frame by reducing the screen size or reducing the frame rate.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-142222 discloses a screen size changing device that converts an image compression-coded in the space axis and time-axis directions into a compression-coded image of a different resolution at high speed.
- the variable length decoding means decodes the compressed image, outputs the motion vector information of each frame and the orthogonal transformation image, the orthogonal transformation image is inversely quantized, and the hierarchical inverse orthogonal transformation means changes the number of pixels of the orthogonal transformation image.
- the inverse orthogonal transform is performed according to the rate, and the uncompressed differential image or the uncompressed image after the resolution change is output, and the motion vector correcting unit corrects the decoded motion vector information according to the change rate of the number of pixels.
- the motion vector generation means generates motion vector information after the resolution change using the decoded motion vector information
- the motion compensated uncompressed image generation means performs motion compensation processing of the uncompressed differential image using this, Generate a compressed image.
- the motion compensated non-compressed difference image generation unit generates an uncompressed difference image of the uncompressed image using the motion vector information after the resolution change.
- the uncompressed differential image and the uncompressed image are then compressed. An uncompressed image after the resolution change can be directly generated from the compressed image before the resolution change.
- Patent Document 2 discloses an image supplied as an encoded data image size conversion device that can easily and satisfactorily obtain an image size conversion of data encoded using motion compensation prediction and orthogonal transform.
- Macroblock image data converted from encoded data to a predetermined image size is obtained by an image data converter, and a converted motion vector related to the macroblock image data is converted to a motion vector of supplied image encoded data.
- obtaining a motion vector converter by multiplying the ratio if the conversion ratio is less than 1, an integrated motion vector is obtained according to the variance of a plurality of converted motion vectors necessary for image data conversion, and the integrated motion vector is obtained. This was realized by obtaining the size-converted image encoded data using the obtained macroblock image data.
- Patent Document 3 there is no significant deterioration in image quality even in a portion where movement is intense, and the size of the output image can be changed with a simple configuration that does not require low-pass filtering processing and thinning processing after decoding processing.
- a motion vector conversion unit that converts the size of a motion vector from motion vector information included in a bitstream is provided.
- a configuration is disclosed in which inverse DCT is performed using only the DCT coefficient on the band side, and when the magnitude of the motion vector is large, inverse DCT is performed using the DCT coefficient on the high band side in addition to the DCT coefficient on the low band side. Has been.
- Patent Document 4 in a coding apparatus that performs re-encoding using a coding method that combines motion compensated prediction and DCT, second video encoded data obtained by converting the image size from first video encoded data is obtained.
- an IDCT Inverse DCT
- an IDCT Inverse DCT
- decoding into image data by motion compensation prediction in the spatial domain thereby reducing the computation amount of the IDCT processing and the image size conversion processing and preventing an increase in the computation amount of motion compensation prediction decoding in the DCT region. It is disclosed.
- the biggest problem is the amount of computation during re-encoding. This is because an operation for performing re-prediction is required when re-encoding after converting the image size of the received stream.
- the received stream information is used as it is when re-encoding after converting the image size of the received stream, the image quality deteriorates.
- An object of the present invention is to provide an apparatus, a method, and a program for speeding up the conversion of the image size of input encoded data.
- the invention disclosed in the present application is generally configured as follows in order to solve at least one of the above-described problems.
- an image conversion apparatus including means for reusing at least one of a prediction mode, a block type, a motion vector, and reference frame information for the encoding.
- the received encoded data is decoded into image data, Change the size of the decoded image data;
- a process of decoding received encoded data Processing to change the size of the decoded image data; A process of reusing at least one of a prediction mode, a block type, a motion vector, and reference frame information of the received encoded data for the encoding when encoding the image data after the size change; A program for causing a computer to execute is provided.
- the present invention when the image size of the input encoded data is converted, it can be converted at high speed. In addition, according to the present invention, it is possible to suppress deterioration in image quality when converting the image size of input encoded data.
- means for decoding the received encoded data means for changing the size of the decoded image data, and prediction of the received encoded data when encoding the image data after the size change.
- a reception buffer (102 in FIG. 1) that receives input encoded data (110 in FIG. 1)
- a reception buffer (102) 102) decoding unit (103 in FIG. 1) that decodes the encoded data received from the image into the image data
- a size conversion request (107 in FIG. 1) from the outside of the apparatus and encoding from the decoding unit (103 in FIG. 1)
- the parameter (112 in FIG. 1) is received and input from the conversion control unit (101 in FIG. 1) that controls the size conversion unit (104 in FIG. 1) and the encoding unit (105 in FIG. 1) and the decoding unit (103).
- a size conversion unit (104) for converting the size of the image data based on an instruction from the conversion control unit (101), and an image data input from the size conversion unit (104) according to an instruction from the conversion control unit (101).
- Mark A coding unit (105), a transmission buffer for outputting the encoding unit from (105) receives the encoded data (106 in FIG. 1) for generating data.
- the input encoded data is decoded into image data by the decoding unit (103).
- the size conversion unit (104) converts the size of the image data.
- the prediction mode and the motion vector of the encoding parameter obtained from the decoding unit (103) are expanded / reduced or divided / combined based on the conversion ratio of the size conversion request.
- the encoding unit (105) encodes the size-converted image data using the converted prediction mode and motion vector, and transmits the encoded data to the outside of the moving image conversion apparatus via the transmission buffer (106).
- a high-speed conversion method can be provided when converting the image size of input encoded data.
- description will be made with reference to examples.
- FIG. 1 is a diagram showing a configuration of a moving image conversion apparatus 100 according to the first embodiment of the present invention.
- the moving image conversion apparatus 100 includes a conversion control unit 101, a reception buffer 102, a decoding unit 103, a size conversion unit 104, an encoding unit 105, and a transmission buffer 106.
- the conversion control unit 101 Based on the size conversion request 107 from the outside of the apparatus and the encoding parameter 112 from the decoding unit 103, the conversion control unit 101 sends a size conversion request 108 to the size conversion unit 104 and the encoding unit 105. Conversion information 109 is provided.
- the size conversion request 107 for example, ⁇ magnification, ⁇ Image size after conversion, ⁇ bit rate, -Encoding information.
- the conversion control unit 101 When the conversion control unit 101 receives the encoded information as the size conversion request 107 from the outside, the conversion control unit 101 can send the encoded information 117 to the decoding unit 103.
- the size conversion request 108 that is an instruction from the conversion control unit 101 to the size conversion unit 104 will be specifically described.
- the conversion control unit 101 Upon receiving the external size conversion request 107, the conversion control unit 101 issues a size conversion request 108 for input image data to the size conversion unit 104.
- the size conversion request is transmitted to the size conversion unit 104 as it is.
- the conversion control unit 101 When the image size after conversion is input from the outside, the conversion control unit 101 obtains the image size before size conversion from the encoding parameter 112 received from the decoding unit 103, and inputs the magnification or input / output to the size conversion unit. Send image size information. When the image size after size conversion is the same as that before conversion, the conversion control unit 101 instructs the size conversion unit 104 not to convert.
- the conversion control unit 101 uses the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103 to generate conversion information 109 to be sent to the encoding unit 105.
- the conversion information 109 for example, ⁇ Image data size, ⁇ Frame type, ⁇ Prediction mode and direction (prediction direction), ⁇ Motion vector, ⁇ Reference frame information, ⁇ Block size, ⁇ Block type, ⁇ bit rate, There is.
- inter-frame prediction among the conversion information 109, for example, ⁇ Frame type, ⁇ Motion vector, ⁇ Reference frame information, ⁇ Block size, ⁇ Block type, Is used.
- intra-frame prediction among the conversion information 109, for example, ⁇ Frame type, ⁇ Prediction mode and direction, ⁇ Block size, ⁇ Block type, Is used.
- Example 1 When converting the image size to double: If the motion vector of the 8 ⁇ 8 block A of the input encoded data is 5 on the right and 4 on the top, the size is 16 ⁇ 16, 5 on the right, and 5 in order to encode the block A after the size conversion. 4 motion vectors are sent to the encoding unit 105. At this time, the reference frame information uses the same value as the input encoded data.
- the reception buffer 102 receives the input encoded data 110 transmitted from the outside and transmits it to the decoding unit 103.
- the decoding unit 103 uses the encoding information 117 to decode the image data 113 from the input encoded data 111 received from the reception buffer 102, and the image data Is sent to the size converter 104.
- the decoding unit 103 decodes image data from the input encoded data using the encoded information included in the input encoded data 111.
- the decoding unit 103 notifies the conversion control unit 101 of the encoding parameter 112 of the input encoded data obtained when decoding.
- the size conversion unit 104 converts the image size of the image data 113 received from the decoding unit 103 using the magnification or the input / output image size in the information of the size conversion request 108 from the conversion control unit 101, and converts the converted image Data is sent to the encoding unit 105.
- the encoding unit 105 encodes the image data received from the size conversion unit 104 using the information from the conversion control unit 101, and sends the encoded data 115 to the transmission buffer.
- the processing of the conversion control unit 101, the decoding unit 103, the size conversion unit 104, and the encoding unit 105 may be realized by a program that operates on a computer constituting the moving image conversion apparatus 100.
- FIG. 2 is a diagram showing a configuration of the encoding unit 105 of FIG. 1, and the encoding unit 105 will be described with reference to FIG.
- H. H.264 will be described as an example, but it is only an example provided for explaining the present invention, and the present invention is not limited thereto.
- the present invention can also be applied to other moving image compression encoding methods.
- the encoding unit 105 includes an inter-frame prediction data generation unit 201, an intra-frame prediction data generation unit 202, a switch 203, a frame memory 204, a DCT unit 205, a quantizer 206, an inverse quantizer 207, An inverse DCT unit 208, an in-loop filter unit 209, a variable length encoder 210, and a header information generation unit 211 are provided.
- the inter-frame prediction data generation unit 201 performs inter-frame prediction using the conversion information 109 received from the conversion control unit 101 and the image data 213 from the frame memory 204, generates prediction data, and sends the prediction data to the switch 203.
- the conversion information 109 used in the inter-frame prediction data generation unit 201 ⁇ Motion vector, ⁇ Reference frame information, ⁇ Block size, ⁇ Block type, and so on.
- the intra-frame prediction data generation unit 202 performs intra-frame prediction using the conversion information 109 received from the conversion control unit 101 and the image data 114 received from the size conversion unit 104, generates prediction data, and sends the prediction data to the switch 203. send.
- As the conversion information 109 used in the intra-frame prediction data generation unit 202 ⁇ Prediction mode and direction ⁇ Block size ⁇ Block type, and so on.
- the switch 203 converts the prediction data generated by the inter-frame prediction data generation unit 201 or the intra-frame prediction data generation unit 202 according to the conversion information 109 instructed by the conversion control unit 101, into the DCT unit 205, the in-loop filter unit 209, and the frame. It switches so that it can send to the internal prediction data production
- the quantizer 206 determines the quantization step with the bit rate in the conversion information 109 from the conversion control unit 101 as a target. Note that the method for determining the quantization step is the same as that of a normal encoder, and thus the description thereof is omitted.
- the header information generation unit 211 generates header information 212 based on the conversion information 109 received from the conversion control unit 101 and outputs the header information 212 to the variable length encoder 210.
- the conversion information 109 used in the header information generation unit 211 ⁇ Frame type, ⁇ Image size, ⁇ Motion vector, ⁇ Block size, ⁇ Block type, ⁇ Prediction mode and direction, -Reference frame information, etc.
- the transmission buffer 106 outputs the image stream received from the encoding unit 105 to the outside.
- the image size of the input encoded data when the image size of the input encoded data is converted, it can be converted at high speed.
- FIG. 3 is a diagram showing a detailed configuration of the moving image conversion apparatus 300 according to the second embodiment of the present invention.
- the same reference numerals are given to the same elements as those in FIG. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the encoding unit 105 has the same configuration as that shown in FIG.
- the conversion control unit 301 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 109 to the encoding unit 105 based on the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103.
- the procedure for creating the conversion information 109 using the size conversion request 107 and the encoding parameter 112 will be described below.
- the example has been set to 2 ⁇ , but it can be realized with magnifications other than the following.
- Example 1 When converting the image size to double: If the motion vector of the 8x8 block A of the input encoded data is 5 on the right and 4 on the top, when encoding the block A after the size conversion, the size is 16x16, 10 on the right and on the top 8 motion vectors are sent to the encoding unit 105.
- the reference frame information uses the same value as the input encoded data.
- the processing of the conversion control unit 301, the decoding unit 103, the size conversion unit 104, and the encoding unit 105 may be realized by a program that operates on a computer that configures the moving image conversion apparatus 300.
- FIG. 4 is a diagram showing a detailed configuration of the moving image conversion apparatus 400 according to the third embodiment of the present invention.
- the same elements as those in FIG. 1 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the encoding unit 105 has the same configuration as that shown in FIG.
- the conversion control unit 401 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 109 to the encoding unit 105 based on the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103.
- the size is set to 16 ⁇ 16 in order to encode the block B after the size conversion.
- the intra-frame prediction mode of 16 ⁇ 16 blocks it approximates the existing prediction direction. For example, when there are only four directions of left, right, upper, and lower, information on the left direction is sent to the encoding unit 105.
- the processing of the conversion control unit 401, the decoding unit 103, the size conversion unit 104, and the encoding unit 105 may be realized by a program that operates on a computer constituting the moving image conversion apparatus 400.
- FIG. 5 is a diagram showing a detailed configuration of the moving image conversion apparatus 500 according to the fourth embodiment of the present invention.
- the same elements as those in FIG. 1 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the encoding unit 105 has the same configuration as that shown in FIG.
- the conversion control unit 501 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 109 to the encoding unit 105 based on the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103.
- Example 1> When converting the image size to double: If the motion vector of the 16 ⁇ 16 block A of the input encoded data is 5 on the right and 4 on the top, the block A after size conversion is 32 ⁇ 32. At this time, if the maximum unit of the block to be encoded is 16 ⁇ 16, it is necessary to divide the size-converted 32 ⁇ 32 block A into four for encoding. At this time, for each of the four divided 16 ⁇ 16 blocks, 10 motion vectors on the right and 8 motion vectors on the right are sent to the encoding unit. At this time, the reference frame information uses the same value as the input encoded data.
- the most prediction mode / direction among the four is sent to the encoding unit 105. If there are four 2 ⁇ 2 blocks, two on the left and two on the top, and there is a 45 ° direction mode, a mode in the upper left 45 ° direction is selected. The average value mode is used when four 2 ⁇ 2 blocks are left, right, top, and bottom.
- the image size of the input encoded data can be converted at a high speed, and the flexibility of the size conversion can be increased as compared with the third embodiment.
- the processes of the conversion control unit 501, the decoding unit 103, the size conversion unit 104, and the encoding unit 105 may be realized by a program that operates on a computer that configures the moving image conversion apparatus 500.
- FIG. 6 is a diagram showing a detailed configuration of the moving image conversion apparatus 600 according to the third embodiment of the present invention.
- the same reference numerals are given to the same elements as those in FIG. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the conversion control unit 601 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 603 to the encoding unit 602 based on the external size conversion request 107 and the encoding parameter 112 from the decoding unit 103.
- FIG. 7 is a diagram showing a detailed configuration of the encoding unit 602 in FIG.
- the same elements as those in FIG. 2 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the inter-frame prediction encoding unit 701 performs inter-frame prediction code using the conversion information 603 received from the conversion control unit 601. More specifically, reference frame information, a motion vector and frame search range, and a motion vector search range are received as conversion information 603.
- the inter-frame prediction encoding unit 701 When the inter-frame prediction encoding unit 701 receives one image data from the frame memory 204, the inter-frame prediction encoding unit 701 performs inter-frame prediction on the one image data for the motion vector search range starting from the motion vector. .
- a search range for example, a search is made from a motion vector as a starting point to a point that is uniformly spaced up, down, left, and right.
- the inter-frame prediction encoding unit 701 uses the direction of the motion vector and searches for a point away from a certain position by narrowing down in the direction of the motion vector with the motion vector as a starting point.
- the inter-frame prediction encoding unit 701 searches for a motion vector for the frame search range starting from the frame number, and determines the best motion vector and frame number 703. Then, it is sent to the variable length encoder 210.
- the intra-frame prediction encoding unit 702 performs intra-frame prediction code using the conversion information 603 received from the conversion control unit 601. More specifically, a prediction mode and a search range are received as the conversion information 603.
- the intra-frame prediction encoding unit 702 determines the best prediction mode 704 from the prediction modes for the search range starting from the prediction mode, and performs variable-length encoding. To vessel 210.
- the prediction mode received from the information 603 is the left direction and the search range is 2, in addition to the left frame prediction, the upper left 45 ° and lower left 45 ° predictions are performed. And determine the best prediction mode.
- the image data when the image size of the input encoded data is converted, the image data can be converted at a high speed, and the image quality can be improved as compared with the first to fourth embodiments.
- the processes of the conversion control unit 601, the decoding unit 103, the size conversion unit 104, and the encoding unit 602 may be realized by a program that runs on a computer that configures the moving image conversion apparatus 600.
- FIG. 8 is a diagram showing a detailed configuration of the moving image conversion apparatus 800 in the sixth embodiment of the present invention.
- the same elements as those in FIG. 1 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the conversion control unit 801 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 803 to the encoding unit 802 based on the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103.
- the conversion control unit 801 converts the conversion information 803 as, for example, ⁇ Image data size, ⁇ Frame type, ⁇ Prediction mode and direction, ⁇ Motion vector, ⁇ Reference frame information, ⁇ Block size, ⁇ Block type, -Code amount distribution bit rate of input encoded data, -Send a threshold to determine whether to use the prediction mode or motion vector.
- the threshold is, for example, The size of the block to be predicted x the average value of the amplitude of the image data or its square, or -There is a target code amount for each block calculated from the bit rate and the code amount distribution of the input encoded data.
- FIG. 9 is a diagram showing a detailed configuration of the encoding unit 802 in the fifth embodiment of the present invention shown in FIG.
- the same reference numerals are assigned to the same elements as those in FIG. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the inter-frame prediction data generation unit 901 generates inter-frame prediction data using the motion vector and frame number in the conversion information 803 received from the conversion control unit 801. Then, the difference between the inter-frame prediction data and the image data in the frame memory is compared with the threshold value. When the prediction residual is smaller than the threshold, the motion vector and frame number received by the conversion information 803 are adopted.
- the inter-frame prediction encoding unit 902 When the prediction residual is larger than the threshold, the inter-frame prediction encoding unit 902 performs inter-frame prediction, determines a motion vector and a frame number 906, and sends the motion vector and the frame number 906 to the variable-length encoder 210.
- the motion vector and frame number received in the conversion information 803 may be used as a starting point.
- an intra-frame prediction encoding unit 903 may be used instead of the inter-frame prediction encoding unit 902.
- the intra-frame prediction data generation unit 904 generates intra-frame prediction data using the prediction mode received in the conversion information 803. Then, the intra-frame prediction encoding unit 903 compares the threshold between the difference between the intra-frame prediction data generated by the intra-frame prediction data generation unit 904 and the image data near the block.
- the intraframe prediction encoding unit 903 adopts the prediction mode received by the conversion information 803.
- the intraframe prediction encoding unit 903 When the prediction residual is larger than the threshold, the intraframe prediction encoding unit 903 performs intraframe prediction, determines the prediction mode 907, and sends the prediction mode 907 to the variable length encoder 210. At this time, the prediction mode received by the conversion information 803 may be used as a starting point. Further, instead of the intra-frame prediction encoding unit 903, an inter-frame prediction encoding unit 902 may be used.
- the processing of the conversion control unit 801, the decoding unit 103, the size conversion unit 104, and the encoding unit 802 may be realized by a program that runs on a computer constituting the moving image conversion apparatus 800.
- FIG. 10 is a diagram showing a detailed configuration of the moving image conversion apparatus 1000 according to the seventh embodiment of the present invention. 10, the same elements as those in FIG. 1 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the conversion control unit 1001 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 1003 to the encoding unit 1002 based on the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103.
- the conversion control unit 1001 converts the conversion information 1003 as follows: ⁇ Image data size, ⁇ Frame type, ⁇ Prediction mode and direction, ⁇ Motion vector, ⁇ Reference frame information, ⁇ Block size, ⁇ Block type, ⁇ Quantization step size, Send.
- the conversion control unit 1001 is included in the conversion request 107 from the outside. Image data size, It is also possible to convert the quantization step size to N times or 1 / N times compared to the information before conversion for at least one of the bit rates.
- FIG. 11 is a diagram showing a detailed configuration of the encoding unit 1002 in the seventh embodiment of the present invention.
- the same reference numerals are given to the same elements as those in FIG. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the quantizer 1101 performs quantization using the quantization step size included in the conversion information 1003 received from the conversion control unit 1001.
- the processes of the conversion control unit 1001, the decoding unit 103, the size conversion unit 104, and the encoding unit 1002 may be realized by a program that operates on a computer that configures the moving image conversion apparatus 1000.
- FIG. 12 is a diagram showing a detailed configuration of the moving image conversion apparatus 1200 according to the eighth embodiment of the present invention.
- the same elements as those in FIG. 1 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the conversion control unit 1201 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 1203 to the encoding unit 1202 based on the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103.
- the conversion control unit 1201 converts the conversion information 1203 as, for example, ⁇ Image data size, ⁇ Frame type, ⁇ Prediction mode, direction, ⁇ Motion vector, ⁇ Reference frame information, ⁇ Block size, ⁇ Block type, ⁇ bit rate, -Send the distribution of the code amount of the input encoded data.
- FIG. 13 is a diagram showing a detailed configuration of the encoding unit 1202 in the eighth embodiment of the present invention.
- the same reference numerals are given to the same elements as those in FIG. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the quantizer 1301 determines the target code amount of each block using the bit rate and the code amount distribution of the input encoded data included in the conversion information 1203 received from the conversion control unit 1201. The quantization step size is determined and quantization is performed.
- the processing of the conversion control unit 1201, the decoding unit 103, the size conversion unit 104, and the encoding unit 1202 may be realized by a program that runs on a computer constituting the moving image conversion apparatus 1200.
- FIG. 14 is a diagram showing a detailed configuration of a moving image conversion apparatus 1400 in the ninth embodiment of the present invention.
- the same elements as those in FIG. 1 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the conversion control unit 1401 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 1403 to the encoding unit 1402 based on the size conversion request 107 from the outside and the encoding parameter 112 from the decoding unit 103.
- image data size, frame type, prediction mode / direction, motion vector, reference frame information, block size, block type, bit rate, and quantization information are sent.
- the quantization information includes whether to use the quantization step size of the input encoded data and the code amount distribution of the input encoded data, the quantization step size, and the bit rate.
- Whether or not to use the quantization step size of the input encoded data is determined when the size conversion ratio is large, when the ratio of the bit rate of the input encoded data and the bit rate of the output encoded data is large, the size conversion ratio When the difference between the increase / decrease and the increase / decrease in the input / output bit rate ratio is large, the quantization step size of the input encoded data is not used.
- the determination of whether or not to use the code amount distribution of the input encoded data does not use the code amount distribution of the input encoded data when the difference between the target bit rate and the output code amount is large.
- FIG. 15 is a diagram showing a detailed configuration of the encoding unit 1402 in the ninth embodiment of the present invention.
- the same elements as those of FIG. 9 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the quantizer 1501 determines whether to use the quantization step size and code amount distribution of the input encoded data included in the conversion information 1403 received from the conversion control unit 1401, the quantization step size and the code amount distribution. Quantize using the bit rate.
- the quantization step size and code amount distribution of the input encoded data Quantization is performed with the quantization step size calculated by using, and when not used, the quantization step size is determined by itself based on the bit rate and is quantized.
- the image size of the input encoded data can be converted at a high speed, and the image quality can be adjusted more than the seventh and eighth embodiments.
- the processing of the conversion control unit 1401, the decoding unit 103, the size conversion unit 104, and the encoding unit 1402 may be realized by a program that runs on a computer that configures the moving image conversion apparatus 1400.
- FIG. 16 is a diagram showing a detailed configuration of a moving image conversion apparatus 1600 according to the tenth embodiment of the present invention.
- the conversion control unit 1601 outputs the size conversion request 108 to the size conversion unit 104 and the conversion information 1603 to the encoding unit 1602 based on the external size conversion request 107 and the encoding parameter 112 from the decoding unit 103.
- image data size, frame type, prediction mode / direction, motion vector, reference frame information, block size, block type, bit rate, and filtering information are sent.
- Filter processing information refers to whether or not to perform filter processing on image data before encoding or image data that is being encoded, filter strength when filter processing is performed, and information on a region where the filter is to be executed and so on.
- Whether or not to execute the filter processing is based on the output bit rate for the screen size after size conversion, whether the image size conversion is enlarged or reduced, and whether the bit rate of the input encoded data is high or low to decide.
- filtering information included in the input encoded data For example, use filtering information included in the input encoded data, or filter processing when the output bit rate is low or the input encoded data bit rate is low relative to the screen size after size conversion.
- the output bit rate is high with respect to the screen size after the size conversion, or when the bit rate of the input encoded data is high, it is determined that the filter processing is not performed when the image size is reduced.
- FIG. 17 is a diagram showing a detailed configuration of the encoding unit 1602 in the tenth embodiment of the present invention.
- the same elements as those of FIG. 9 are denoted by the same reference numerals. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the in-loop filter unit 1701 performs filter processing based on the conversion information 1603 received from the conversion control unit 1601. When the conversion information 1603 is instructed to perform filter processing, the image data 1702 is filtered.
- the filtering process is performed according to the information 1603.
- the image data 1702 is sent to the frame memory 204 as it is.
- the present invention in the present embodiment, the presence / absence of the filtering process for the image data being encoded has been described. However, this is merely an example presented for the purpose of describing the present invention, and it is needless to say that the present invention is not limited thereto. As is apparent from the principle of the moving image conversion apparatus of the present invention, the present invention can also be applied to the determination of the presence or absence of filter processing for image data before encoding.
- the processing of the conversion control unit 1601, the decoding unit 103, the size conversion unit 104, and the encoding unit 1602 may be realized by a program that runs on a computer that configures the moving image conversion apparatus 1600.
- FIG. 18 is a diagram showing a detailed configuration of the moving image conversion apparatus 1800 in the eleventh embodiment of the present invention.
- the conversion control unit 1801 provides conversion information 1804 to the size conversion unit 104 and provides conversion information 1805 to the encoding unit 1802 based on the conversion request 1803 from the outside and the encoding parameter 112 from the decoding unit 103.
- the conversion control unit 1801 sends conversion information 1804 including a size conversion / frame skip request to the size conversion unit 104 based on the conversion request 1803.
- Conversion information 1804 is ⁇ magnification, ⁇ Image size after conversion, ⁇ bit rate, Encoding information, Includes frame rate information.
- ⁇ Frame rate information of input encoded data and output encoded data ⁇ Number of input encoded data frames to be thinned, ⁇ There is timing information.
- the conversion control unit 1801 upon receiving the encoding parameter 112 from the decoding unit 103, the conversion control unit 1801 sends conversion information 1805 to the encoding unit 1802 based on the conversion request 1803.
- Conversion information 1805 is ⁇ Image data size, ⁇ Frame type, ⁇ Prediction mode and direction ⁇ Motion vector, ⁇ Reference frame information, ⁇ Block size, ⁇ Block type, ⁇ bit rate, ⁇ Quantization information, -Filtering information, -Includes frame skip information.
- the conversion control unit 1801 determines whether to reduce the frame rate, and notifies the encoding unit 1802 of the presence or absence of encoding for each frame.
- a method for generating motion vectors and reference frame information when the frame rate is lowered will be described by taking an example in which frames are thinned every other frame after doubling the screen size. However, as is apparent from the principle of the present invention, other sizes and frame rates can be implemented.
- Example 1 As for the reference frame, when the frame refers to the frame to be thinned out, the past or future output frame is referred to. Further, since it is necessary to thin out the reference frame number, the number of frames to be thinned out is subtracted. When the frame refers to the output frame, the frame is referred to as it is. Also in this case, since it is necessary to thin out the reference frame number, the number of frames to be thinned out is subtracted.
- the motion vector of the input encoded data is doubled.
- the size of the motion vector is kept at the screen size ratio.
- the frame refers to a frame to be thinned out, refer to an output frame of the past or future than that, for example, when the frame to be thinned is one frame before the frame and when referring to two frames before,
- the motion vector is further doubled from the screen size ratio.
- the motion vector is further multiplied by 0.66 from the screen size ratio.
- Example 2 For the reference frame, when the frame refers to a frame to be thinned out, an output frame referred to by the frame to be thinned is referred to. Further, since it is necessary to thin out the reference frame number, the number of frames to be thinned out is subtracted.
- the motion vector of the input encoded data is doubled.
- the size of the motion vector is kept at the screen size ratio.
- the frame refers to a frame to be thinned out
- an output frame of the past or future is referred to, and the motion vector in the input encoded data of the frame is added to the motion vector of the frame to be thinned out.
- the size conversion unit 104 discards the image data 113 input from the decoding unit 103 without performing size conversion, and sends it to the encoding unit 1802. do not send.
- the encoding unit 1802 generates output code data based on the conversion information 1805 and the image data 114. Since the configuration and operation other than those described above are the same as those in the first to tenth embodiments, description thereof will be omitted.
- the image size of the input encoded data can be converted at high speed.
- the processes of the conversion control unit 1801, the decoding unit 103, the size conversion unit 104, and the encoding unit 1802 may be realized by a program that runs on a computer that configures the moving image conversion apparatus 1800.
- FIG. 19 is a diagram showing a detailed configuration of a moving image conversion apparatus 1900 in the twelfth embodiment of the present invention. 19, the same reference numerals are assigned to the same elements as those in FIG. In the following, description of the same elements will be omitted as appropriate to avoid duplication.
- the conversion control unit 1901 outputs a size conversion request 1904 to the size conversion unit 104 and conversion information 1905 to the encoding unit 1903 based on the conversion request 1906 from the outside and the encoding parameter 112 from the decoding unit 1902.
- the conversion request 1904 includes size conversion information, input encoding data encoding method, and output encoded data encoding method information.
- the conversion control unit 1901 Upon receiving the encoding parameter 112 from the decoding unit 1902, the conversion control unit 1901 sends the image data size, frame type, prediction mode / direction, motion vector, reference frame to the encoding unit 1903 based on the conversion request 1904. Send information, block size, block type, bit rate, quantization information, filtering information.
- the conversion control unit 1901 converts the encoding parameter 112 by the method described in the first to eleventh embodiments and sends it to the encoding unit 1903. .
- the conversion control unit 1901 predicts the input encoded data prediction mode / direction, motion vector, reference frame information, block size, block type, picture type, and quantization. Information and filter processing information are converted so as to match the output encoding method.
- the closest prediction mode / direction is approximated.
- the upper and lower limit values and scales are matched with the output encoding method.
- the frame number is expanded / reduced to the maximum / minimum value of the output encoding method.
- reference frame information not related to the output encoding method is not sent to the encoding unit 1903.
- the corresponding part is re-encoded without using the information of the input encoded data.
- the prediction mode / direction and motion vector are synthesized by the method described in the fourth embodiment.
- the corresponding frame is re-encoded, or only the information whose picture type difference is not related to the output coding method is added If so, the information is not sent and the picture type is approximated and sent to the encoding unit 1903.
- conversion is performed according to the upper / lower limit values and the meaning of the scale (for example, logarithm or multiple).
- filter processing information if it is present in the input coding scheme and not present in the output coding scheme, no filtering is performed, or if only information not related to the output coding scheme is added, the information is sent. First, filter processing information is generated.
- the processing of the conversion control unit 1901, the decoding unit 1902, the size conversion unit 104, and the encoding unit 1903 may be realized by a program that runs on a computer constituting the moving image conversion apparatus 1900.
- (Appendix 1) Means for decoding the received encoded data; Means for changing the size of the decoded image data; Means for reusing at least one of a prediction mode, a block type, a motion vector, and reference frame information of the received encoded data for the encoding when encoding the image data after the size change; An image conversion apparatus characterized by that.
- (Appendix 2) When encoding the image data after the size change, a means for expanding or shortening at least one of a motion vector and a block type of the received encoded data in accordance with an image size ratio before and after conversion is provided.
- the image conversion apparatus according to appendix 1, wherein (Appendix 3) The supplementary note 1 according to claim 1, further comprising means for approximating a prediction mode when the prediction mode of the received encoded data cannot be used as it is after the size conversion when encoding the image data after the size change.
- Image conversion device (Appendix 4) The image conversion according to any one of appendices 1 to 3, further comprising means for dividing or combining and reusing at least one of the prediction mode and the motion vector in accordance with the image size ratio before and after the conversion. apparatus. (Appendix 5) The image conversion apparatus according to any one of appendices 1 to 4, further comprising means for performing re-prediction using at least one of the reused prediction mode and motion vector as a starting point.
- the image conversion apparatus according to any one of appendices 1 to 14, wherein the decoding method and the encoding method are different from each other.
- Appendix 16 Decode the received encoded data into image data, Change the size of the decoded image data; When encoding the image data after the size change, at least one of a prediction mode, a block type, a motion vector, and reference frame information of the received encoded data is reused for the encoding.
- Image conversion method (Appendix 17) When encoding the image data after the size change, at least one of the motion vector and block type of the received encoded data is expanded or shortened according to the image size ratio before and after the conversion. The image conversion method according to appendix 16.
- (Appendix 21) The image conversion method according to any one of supplementary notes 16 to 20, wherein a frame rate is converted when the image data after the size change is encoded.
- (Appendix 22) A process of decoding the received encoded data; Processing to change the size of the decoded image data; A process of reusing at least one of a prediction mode, a block type, a motion vector, and reference frame information of the received encoded data for the encoding when encoding the image data after the size change; A program that causes a computer to execute.
- Appendix 25 The program according to any one of appendices 22 to 24, which causes the computer to execute a process of dividing or synthesizing at least one of a prediction mode and a motion vector in accordance with an image size ratio before and after conversion.
- Appendix 26 Appendices 22 to 25 for causing the computer to execute a process of determining whether to reuse at least one of a quantization step size and a code amount distribution of input encoded data when encoding the image data after the size change.
- Appendix 27 The program according to any one of appendices 22 to 26, which causes the computer to execute a process of converting a frame rate when encoding the image data after the size change.
- a decoding unit for decoding the received encoded data into image data A conversion control unit that receives a size conversion request from the outside of the apparatus or an encoding parameter from the decoding unit, and controls the size conversion unit and the encoding unit; A size conversion unit that performs size conversion on the basis of an instruction from the conversion control unit, the image data input from the decoding unit; An encoding unit that generates encoded data from the image data input from the size conversion unit in accordance with an instruction from the conversion control unit; With The encoding unit reuses at least one of a prediction mode, a block type, a motion vector, and reference frame information of the received encoded data when the image data after the size change is encoded by the size conversion unit.
- An image conversion apparatus characterized by that.
- the conversion control unit gives a size conversion request to the size conversion unit based on a size conversion request input from the outside of the apparatus and an encoding parameter from the decoding unit, and sends the size conversion request to the encoding unit.
- the size conversion unit converts the image size of the image data received from the decoding unit using the magnification or the input / output image size in the size conversion request information from the conversion control unit, and converts the converted image data into the code Given to
- the encoding unit includes: Using the conversion information received from the conversion control unit and the image data from the frame memory, an inter-frame prediction data generation unit that performs inter-frame prediction and generates prediction data and sends it to the switch; An intra-frame prediction data generation unit that performs intra-frame prediction using the conversion information received from the conversion control unit and the image data received from the size conversion unit, generates prediction data, and sends the prediction data to the switch; With The switch generates a prediction data generated by the inter-frame prediction data generation unit or the intra-frame prediction data generation
- Patent Documents 1 to 4 above are incorporated herein by reference.
- the embodiments and examples can be changed and adjusted based on the basic technical concept.
- Various combinations and selections of various disclosed elements are possible within the scope of the claims of the present invention. That is, the present invention of course includes various variations and modifications that could be made by those skilled in the art according to the entire disclosure including the claims and the technical idea.
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Abstract
Description
本発明は、日本国特許出願:特願2009-002989号(2009年 1月 8日出願)の優先権主張に基づくものであり、同出願の全記載内容は引用をもって本書に組み込み記載されているものとする。
本発明は、画像変換技術に関し、特に、符号化された動画像圧縮符号化ビットストリームのサイズを変換するときに再符号化を行う装置に適用して好適な画像変換方法、装置及びプログラムに関する。
前記復号した画像データのサイズを変更し、
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトルと参照フレーム情報の少なくとも1つを、前記符号化に再利用する、画像変換方法が提供される。
復号した画像データのサイズを変更する処理と、
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトルと参照フレーム情報の少なくとも1つを、前記符号化に再利用する処理と、
をコンピュータに実行させるプログラムが提供される。
・倍率、
・変換後の画像サイズ、
・ビットレート、
・符号化情報
などがある。
・画像データサイズ、
・フレームタイプ、
・予測モードと方向(予測方向)、
・動きベクトル、
・参照フレーム情報、
・ブロックサイズ、
・ブロックタイプ、
・ビットレート、
がある。
・フレームタイプ、
・動きベクトル、
・参照フレーム情報、
・ブロックサイズ、
・ブロックタイプ、
が用いられる。
・フレームタイプ、
・予測モードと方向、
・ブロックサイズ、
・ブロックタイプ、
が用いられる。
入力された符号化データの8x8ブロックAの動きベクトルが、右に5、上に4であった場合、サイズ変換後のブロックAを符号化するために、サイズが16x16で、右に5、上に4の動きベクトルを符号化部105へ送る。このとき、参照フレーム情報は、入力符号化データと同じ値を用いる。
入力された符号化データの8x8ブロックBのフレーム内予測モードが左方向であった場合、サイズ変換後のブロックBを符号化するために、サイズが4x4で、フレーム内予測モードが左方向という情報を符号化部105へ送る。
・動きベクトル、
・参照フレーム情報や、
・ブロックサイズ、
・ブロックタイプ、
などがある。
・予測モードと方向や
・ブロックサイズ、
・ブロックタイプ、
などがある。
・フレームタイプ、
・画像サイズ、
・動きベクトル、
・ブロックサイズ、
・ブロックタイプ、
・予測モードと方向、
・参照フレーム情報
などがある。
入力された符号化データの8x8ブロックAの動きベクトルが右に5、上に4であった場合、サイズ変換後のブロックAを符号化するときは、サイズが16x16で、右に10、上に8の動きベクトルを符号化部105へ送る。参照フレーム情報は、入力符号化データと同じ値を使う。
入力された符号化データの4x4ブロックBのフレーム内予測モードが左上方向(角度が30度)であった場合、サイズ変換後のブロックBを符号化するために、サイズを16x16にする。このとき、16x16ブロックのフレーム内予測モードに、左上方向(角度が30度)がなかった場合、存在する予測方向に近似する。例えば左、右、上、下の4方向しか無かった場合には、左方向という情報を符号化部105へ送る。
入力された符号化データの16x16ブロックAの動きベクトルが右に5、上に4であった場合、サイズ変換後のブロックAは32x32になる。このとき、符号化するブロックの最大の単位が16x16であるものとすると、符号化するためには、サイズ変換後の32x32のブロックAを4分割する必要がある。このとき、分割した4つの16x16ブロック各々に対して、右に10、上に8の動きベクトルを符号化部へ送る。このとき、参照フレーム情報は、入力符号化データと同じ値を使う。
入力された符号化データの4x4ブロックBのフレーム内予測モードが左方向であった場合、サイズ変換後のブロックBは2x2になる。このとき、符号化するブロックの最小単位が4x4であるものとすると、符号化するためにサイズ変換後の2x2のブロックBの周りの2x2ブロックと合成して、4x4ブロックにする必要がある。このとき、2x2ブロック各々の予測モード・方向を合成して、1つの予測モードを決定する。
・画像データサイズ、
・フレームタイプ、
・予測モードと方向、
・動きベクトル、
・参照フレーム情報、
・ブロックサイズ、
・ブロックタイプ、
・ビットレート、
を送る。
・画像データサイズ、
・フレームタイプ、
・予測モードと方向、
・動きベクトル、
・参照フレーム情報、
・ブロックサイズ、
・ブロックタイプ、
・入力符号化データの符号量分布ビットレート、
・予測モードや動きベクトルを使用するか判断するための閾値
を送る。
・予測するブロックのサイズx画像データの振幅の平均値もしくはその2乗、または、
・ビットレートや入力符号化データの符号量分布から算出する各ブロックにおける目標符号量
などがある。
・画像データサイズ、
・フレームタイプ、
・予測モードと方向、
・動きベクトル、
・参照フレーム情報、
・ブロックサイズ、
・ブロックタイプ、
・量子化ステップサイズ、
を送る。
画像データサイズ、
ビットレート
の少なくとも1つについて変換前の情報と比較して、量子化ステップサイズをN倍、1/N倍に変換することも可能とする。
・画像データサイズ、
・フレームタイプ、
・予測モード、方向、
・動きベクトル、
・参照フレーム情報、
・ブロックサイズ、
・ブロックタイプ、
・ビットレート、
・入力符号化データの符号量の分布
を送る。
・倍率、
・変換後の画像サイズ、
・ビットレート、
・符号化情報、
・フレームレート情報
を含む。
・入力符号化データ、出力符号化データ各々のフレームレート情報や、
・入力符号化データのフレームを間引く枚数や、
・タイミングの情報
などがある。
・画像データサイズ、
・フレームタイプ、
・予測モード・方向、
・動きベクトル、
・参照フレーム情報、
・ブロックサイズ、
・ブロックタイプ、
・ビットレート、
・量子化情報、
・フィルタ処理情報、
・フレームスキップ情報
を含む。
・入力符号化データ、出力符号化データ各々のフレームレート情報や、
・入力符号化データのフレームを間引く枚数や、
・タイミングの情報
などがある。
参照フレームについては、当該フレームが間引くフレームを参照している場合、その過去、もしくは未来の出力フレームを参照する。また、参照フレーム番号も間引く必要があるため、フレームを間引く数だけ減算する。当該フレームが出力するフレームを参照している場合、そのままのフレームを参照する。この場合も、参照フレーム番号も間引く必要があるため、フレームを間引く数だけ減算する。
参照フレームについては、当該フレームが間引くフレームを参照している場合、間引くフレームが参照している出力フレームを参照する。また、参照フレーム番号も間引く必要があるため、フレームを間引く数だけ減算する。
(付記1)
受信した符号化データを復号する手段と、
復号した画像データのサイズを変更する手段と、
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトルと参照フレーム情報の少なくとも1つを、前記符号化に再利用する手段を備える、ことを特徴とする画像変換装置。
(付記2)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの動きベクトル、ブロックタイプの少なくとも1つを、変換前後の画像サイズ比に合わせて、伸張又は短縮する手段を備える、ことを特徴とする付記1記載の画像変換装置。
(付記3)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モードがサイズ変換後にそのまま使えない場合に予測モードを近似する手段を備える、ことを特徴とする付記1記載の画像変換装置。
(付記4)
変換前後の画像サイズ比に合わせて、予測モード、動きベクトルの少なくとも1つを分割又は合成して再利用する手段を備える、ことを特徴とする付記1乃至3のいずれか一に記載の画像変換装置。
(付記5)
再利用した予測モード、動きベクトルの少なくとも1つを起点として、再予測する手段を備える、ことを特徴とする付記1乃至4のいずれか一に記載の画像変換装置。
(付記6)
前記再利用した動きベクトルを起点として再予測する場合に、前記動きベクトルの方向を利用する手段を備える、ことを特徴とする付記5記載の画像変換装置。
(付記7)
予測誤差が予め定められた閾値以上の場合に、予測し直す手段を備える、ことを特徴とする付記1乃至6のいずれか一に記載の画像変換装置。
(付記8)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの量子化ステップサイズを再利用する手段を備える、ことを特徴とする付記1乃至7のいずれか一に記載の画像変換装置。
(付記9)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの符号量の分布を再利用する手段を備える、ことを特徴とする付記1乃至7のいずれか一に記載の画像変換装置。
(付記10)
前記サイズ変更後の画像データを符号化する際に、量子化ステップサイズ、入力符号化データの符号量の分布の少なくとも1つを再利用するかを判断する手段を備える、ことを特徴とする付記8又は9記載の画像変換装置。
(付記11)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データのビットレートを変える手段を備える、ことを特徴とする付記1乃至10のいずれか一に記載の画像変換装置。
(付記12)
前記サイズ変更後の画像データを符号化する際に、前記サイズ変換後の画像データ、符号化中の画像データの少なくとも1つにフィルタをかけるか否かを判断する手段を備える、ことを特徴とする付記1乃至11のいずれか一に記載の画像変換装置。
(付記13)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データのピクチャタイプを再利用する手段を備える、ことを特徴とする付記1乃至12のいずれか一に記載の画像変換装置。
(付記14)
前記サイズ変更後の画像データを符号化する際に、フレームレートを変換する、ことを特徴とする付記1乃至13のいずれか一に記載の画像変換装置。
(付記15)
復号方式と符号化方式が互いに別の方式である、ことを特徴とする付記1乃至14のいずれか一に記載の画像変換装置。
(付記16)
受信した符号化データから画像データに復号し、
前記復号した画像データのサイズを変更し、
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトルと参照フレーム情報の少なくとも1つを、前記符号化に再利用する、ことを特徴とする画像変換方法。
(付記17)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの動きベクトル、ブロックタイプの少なくとも1つを、変換前後の画像サイズ比に合わせて、伸張又は短縮する、ことを特徴とする付記16記載の画像変換方法。
(付記18)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モードがサイズ変換後にそのまま使えない場合に予測モードを近似する、ことを特徴とする付記16記載の画像変換方法。
(付記19)
変換前後の画像サイズ比に合わせて、予測モード、動きベクトルの少なくとも1つを分割又は合成して再利用する、ことを特徴とする付記16乃至18のいずれか一に記載の画像変換方法。
(付記20)
前記サイズ変更後の画像データを符号化する際に、量子化ステップサイズ、入力符号化データの符号量の分布の少なくとも1つを再利用するかを判断する、ことを特徴とする付記16乃至19のいずれか一に記載の画像変換方法。
(付記21)
前記サイズ変更後の画像データを符号化する際に、フレームレートを変換する、ことを特徴とする付記16乃至20のいずれか一に記載の画像変換方法。
(付記22)
受信した符号化データを復号する処理と、
復号した画像データのサイズを変更する処理と、
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトルと参照フレーム情報の少なくとも1つを、前記符号化に再利用する処理と、
をコンピュータに実行させるプログラム。
(付記23)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの動きベクトル、ブロックタイプの少なくとも1つを、変換前後の画像サイズ比に合わせて、伸張又は短縮する処理を前記コンピュータに実行させる付記22記載のプログラム。
(付記24)
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モードがサイズ変換後にそのまま使えない場合に予測モードを近似する処理を前記コンピュータに実行させる付記22記載のプログラム。
(付記25)
変換前後の画像サイズ比に合わせて、予測モード、動きベクトルの少なくとも1つを分割又は合成して再利用する処理を前記コンピュータに実行させる付記22乃至24のいずれか一に記載のプログラム。
(付記26)
前記サイズ変更後の画像データを符号化する際に、量子化ステップサイズ、入力符号化データの符号量の分布の少なくとも1つを再利用するか判断する処理を前記コンピュータに実行させる付記22乃至25のいずれか一に記載のプログラム。
(付記27)
前記サイズ変更後の画像データを符号化する際に、フレームレートを変換する処理を前記コンピュータに実行させる付記22乃至26のいずれか一に記載のプログラム。
(付記28)
受信した符号化データを画像データに復号する復号部と、
装置外部からのサイズ変換要求又は前記復号部からの符号化パラメータを受け取り、サイズ変換部や符号化部を制御する変換制御部と、
前記復号部から入力された画像データを前記変換制御部の指示に基づいてサイズ変換を行うサイズ変換部と、
前記変換制御部の指示に従って、前記サイズ変換部から入力された画像データから符号化データを生成する符号化部と、
を備え,
前記符号化部は、前記サイズ変換部でサイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトル、参照フレーム情報の少なくとも1つを再利用する、ことを特徴とする画像変換装置。
(付記29)
前記変換制御部は、装置外部から入力されたサイズ変換要求と、前記復号部からの符号化パラメータとを基に、前記サイズ変換部に対してサイズ変換要求を与え、前記符号化部に対して変換情報を与え、
前記サイズ変換部は、前記変換制御部からのサイズ変換要求情報にある倍率又は入出力画像サイズを用いて、前記復号部から受け取った画像データの画像サイズを変換し変換後の画像データを前記符号化部へ与え、
前記符号化部は、
前記変換制御部から受け取った変換情報とフレームメモリからの画像データを用いて、フレーム間予測を行い予測データを生成してスイッチに送るフレーム間予測データ生成部と、
前記変換制御部から受け取った変換情報と前記サイズ変換部から受け取った画像データとを用いてフレーム内予測を行い、予測データを生成して前記スイッチに送るフレーム内予測データ生成部と、
を備え、
前記スイッチは、前記変換制御部からの指示に従って前記フレーム間予測データ生成部又は前記フレーム内予測データ生成部で生成した予測データを、離散コサイン変換器、ループ内フィルタ器、前記フレーム内予測データ生成部に送ることが出来るように切り替え、
前記変換制御部からの指示のビットレートを目標にして量子化ステップを決定する量子化器と、
前記変換制御部から受け取った変換情報を基にヘッダ情報を生成するヘッダ情報生成部と、
前記ヘッダ情報生成部からのヘッダ情報を基に前記量子化器の出力を可変長符号化する可変長符号化器と、
を備えている、ことを特徴とする付記28記載の画像変換装置。
101 変換制御部
102 受信バッファ
103 復号部
104 サイズ変換部
105 符号化部
106 送信バッファ
107 サイズ変換要求
108 サイズ変換要求
109 変換情報
110 入力符号化データ
111 入力符号化データ
112 符号化パラメータ
113 画像データ
114 画像データ
115 符号化データ
116 符号化データ
117 符号化情報
201 フレーム間予測データ生成部
202 フレーム内予測データ生成部
203 スイッチ
204 フレームメモリ
205 DCT(Discrete Cosine Transform)器
206 量子化器
207 逆量子化器
208 逆DCT器
209 ループ内フィルタ器
210 可変長符号化器
211 ヘッダ情報生成部
212 ヘッダ情報
213 画像データ
300 動画像変換装置
301 変換制御部
400 動画像変換装置
401 変換制御部
500 動画像変換装置
501 変換制御部
600 動画像変換装置
601 変換制御部
602 符号化部
603 変換情報
701 フレーム間予測符号化部
702 フレーム内予測符号化部
703 動きベクトル、参照フレーム情報
704 予測モード
800 動画像変換装置
801 変換制御部
802 符号化部
803 変換情報
901 フレーム間予測データ生成部
902 フレーム間予測符号化部
903 フレーム内予測データ生成部
904 フレーム内予測符号化部
905 スイッチ
906 動きベクトル、参照フレーム情報
907 予測モード
1000 動画像変換装置
1001 変換制御部
1002 符号化部
1003 変換情報
1101 量子化器
1200 動画像変換装置
1201 変換制御部
1202 符号化部
1203 変換情報
1301 量子化器
1400 動画像変換装置
1401 変換制御部
1402 符号化部
1403 変換情報
1501 量子化器
1600 動画像変換装置
1601 変換制御部
1602 符号化部
1603 変換情報
1701 ループ内フィルタ器
1702 画像データ
1800 動画像変換装置
1801 変換制御部
1802 変換要求
1803 サイズ変換・フレームスキップ要求
1804 変換情報
1900 動画像変換装置
1901 変換制御部
1902 復号部
1903 符号化部
1904 変換要求
1905 変換情報
Claims (16)
- 受信した符号化データを復号する手段と、
復号した画像データのサイズを変更する手段と、
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトルと参照フレーム情報の少なくとも1つを、前記符号化に再利用する手段を備える、ことを特徴とする画像変換装置。 - 前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの動きベクトル、ブロックタイプの少なくとも1つを、変換前後の画像サイズ比に合わせて、伸張又は短縮する手段を備える、ことを特徴とする請求項1記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モードがサイズ変換後にそのまま使えない場合に予測モードを近似する手段を備える、ことを特徴とする請求項1記載の画像変換装置。
- 変換前後の画像サイズ比に合わせて、予測モード、動きベクトルの少なくとも1つを分割又は合成して再利用する手段を備える、ことを特徴とする請求項1乃至3のいずれか1項に記載の画像変換装置。
- 再利用した予測モード、動きベクトルの少なくとも1つを起点として、再予測する手段を備える、ことを特徴とする請求項1乃至4のいずれか1項に記載の画像変換装置。
- 前記再利用した動きベクトルを起点として再予測する場合に、前記動きベクトルの方向を利用する手段を備える、ことを特徴とする請求項5記載の画像変換装置。
- 予測誤差が予め定められた閾値以上の場合に、予測し直す手段を備える、ことを特徴とする請求項1乃至6のいずれか1項に記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの量子化ステップサイズを再利用する手段を備える、ことを特徴とする請求項1乃至7のいずれか1項に記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの符号量の分布を再利用する手段を備える、ことを特徴とする請求項1乃至7のいずれか1項に記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、量子化ステップサイズ、入力符号化データの符号量の分布の少なくとも1つを再利用するかを判断する手段を備える、ことを特徴とする請求項8又は9記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データのビットレートを変える手段を備える、ことを特徴とする請求項1乃至10のいずれか1項に記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、前記サイズ変換後の画像データ、符号化中の画像データの少なくとも1つにフィルタをかけるか否かを判断する手段を備える、ことを特徴とする請求項1乃至11のいずれか1項に記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データのピクチャタイプを再利用する手段を備える、ことを特徴とする請求項1乃至12のいずれか1項に記載の画像変換装置。
- 前記サイズ変更後の画像データを符号化する際に、フレームレートを変換する、ことを特徴とする請求項1乃至13のいずれか1項に記載の画像変換装置。
- 復号方式と符号化方式が互いに別の方式である、ことを特徴とする請求項1乃至14のいずれか1項に記載の画像変換装置。
- 受信した符号化データから画像データに復号し、
前記復号した画像データのサイズを変更し、
前記サイズ変更後の画像データを符号化する際に、前記受信した符号化データの予測モード、ブロックタイプ、動きベクトルと参照フレーム情報の少なくとも1つを、前記符号化に再利用する、ことを特徴とする画像変換方法。
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WO2019053932A1 (ja) * | 2017-09-13 | 2019-03-21 | 株式会社Jvcケンウッド | トランスコード装置、トランスコード方法及びトランスコードプログラム |
JP2019054335A (ja) * | 2017-09-13 | 2019-04-04 | 株式会社Jvcケンウッド | トランスコード装置、トランスコード方法及びトランスコードプログラム |
US11375216B2 (en) | 2017-09-13 | 2022-06-28 | Jvckenwood Corporation | Transcoding apparatus, transcoding method, and transcoding program |
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US20120014432A1 (en) | 2012-01-19 |
JPWO2010079797A1 (ja) | 2012-06-21 |
JP2013158060A (ja) | 2013-08-15 |
US9319699B2 (en) | 2016-04-19 |
JP5648709B2 (ja) | 2015-01-07 |
CN102273207A (zh) | 2011-12-07 |
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