WO2010038587A1 - 動画像符号化装置、動画像復号装置、動画像符号化方法、動画像復号方法、動画像符号化プログラム、動画像復号プログラム、及び動画像符号化・復号システム - Google Patents
動画像符号化装置、動画像復号装置、動画像符号化方法、動画像復号方法、動画像符号化プログラム、動画像復号プログラム、及び動画像符号化・復号システム Download PDFInfo
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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
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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
- H04N19/186—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 a colour or a chrominance component
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
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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
- H04N19/184—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 bits, e.g. of the compressed video 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
- H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
Definitions
- the present invention relates to a moving image encoding device, a moving image decoding device, a moving image encoding method, a moving image decoding method, a moving image encoding program, a moving image decoding program, and a moving image for encoding / decoding a moving image.
- the present invention relates to an encoding / decoding system, and particularly relates to the bit length of each pixel of an image handled in the encoding / decoding process.
- Compressive encoding technology is used to efficiently transmit and store moving image data.
- MPEG1, 2, 4 or H.264 is used.
- 261-H. H.264 is widely used.
- the image to be encoded is divided into a plurality of blocks, and then predictive encoding / decoding processing is performed. Specifically, an image of one frame is divided into block areas each having 16 ⁇ 16 pixels.
- a prediction signal is generated using an adjacent reproduced image signal (reconstructed compressed image data) in the same screen as the target block to be encoded. The difference signal obtained by subtracting it from the signal of the target block is encoded.
- an inter-screen predictive encoding method is also used in which a prediction signal of a target block is generated with reference to another image adjacent on the time axis in a moving image, and a difference between the target block and the prediction signal is encoded.
- motion detection is performed on the target block using another frame that has been encoded and restored as a reference image, a prediction signal with the least error is determined, and a difference value from the prediction signal of the target block is obtained.
- discrete cosine transform and quantization processing are performed on the difference signal obtained by intra-screen or inter-screen prediction.
- the quantized discrete cosine transform coefficient and motion vector and mode information for specifying the prediction signal are entropy-coded to generate encoded data.
- the image data encoded in this way is restored and reproduced once in order to obtain a prediction signal of the next target block, and is temporarily stored in the frame memory as a reference image.
- the conventional encoding / decoding processing performs prediction and conversion processing while maintaining the bit length of each pixel of the input image.
- each pixel of luminance and chrominance components is represented by 8 bits. Therefore, encoding / decoding processing such as prediction / conversion is also performed on the 8-bit pixels.
- the reproduced 8-bit reproduced image signal is stored in the frame memory.
- Patent Document 1 discloses a technique for reducing the size of the frame memory and the bandwidth (memory bandwidth) for accessing the memory in order to reduce downsizing and power consumption.
- an image reproduced before being stored in the frame memory is separately compressed. Specifically, the reproduced 8-bit reproduced image is quantized to 8 bits or less and then stored in the frame memory.
- the compressed reproduction image is expanded and used as a reference image. As described above, since the encoding / decoding process is performed while maintaining the bit length of the input image while reducing the capacity and bandwidth of the frame memory, it is possible to suppress the deterioration of the compression encoding performance.
- the present invention has been made to solve the above-described problems, and is capable of improving the encoding efficiency while suppressing the increase in the capacity and bandwidth of the frame memory, and enables the expansion of the moving image encoding that is easy to expand.
- An object is to provide an apparatus, a method and a program, a moving picture decoding apparatus, a method and a program, and a moving picture encoding / decoding system.
- a moving image encoding apparatus includes an input unit that inputs a target image whose pixel value is represented by a first bit length, and sets each pixel of the target image to a value from the first bit length.
- an extension conversion means for generating an extension target image by converting it so as to be represented by a large second bit length, and a reference image having a pixel value represented by a third bit length smaller than the second bit length
- Storage means for generating a prediction signal from a reference image stored in the storage means, converting the prediction signal to be represented by the second bit length and generating an extended prediction signal, and extended prediction
- a residual signal generating means for generating a residual signal between the signal and the expansion target image; an encoding means for encoding the residual signal generated by the residual signal generating means; and restoring the encoded residual signal Added to the extended prediction signal and extended playback.
- a restoration means for generating an image, and a reduction conversion means for converting a pixel value of the extended reproduction image into a reproduction image represented by a third bit length. The reproduction image is stored in the storage means as a reference image.
- the target image whose pixel value is represented by the first bit length is encoded after the conversion so that each pixel value is represented by the second bit length, and the encoded image is restored.
- the pixel value is converted into a reproduction image represented by a third bit length smaller than the second bit length, and this reproduction image is stored in the storage means (frame memory) as a reference image.
- each pixel of the image signal to be encoded is converted into a bit length longer than the bit length of the target signal, so that the encoding process is performed, thereby enabling high-precision calculation of the encoding process and encoding efficiency. Can be increased.
- bit length is shorter than the bit length at the time of the encoding process and stored in the frame memory, an increase in the capacity and bandwidth of the frame memory can be suppressed. As a result, it is possible to increase the encoding efficiency while suppressing an increase in the capacity and bandwidth of the frame memory.
- both the bit length of the reference image stored in the storage unit and the bit length of the reproduction image are the third bit length, when adding processing for processing the reproduction image using the reference image, It is no longer necessary to add processing to absorb the difference in bit length between the reference image and the playback image, and the implementation and processing costs associated with adding new processing such as image processing processing are reduced, and expansion is easy. Become.
- the moving image encoding apparatus is an image for processing a reproduction image using at least a part of the reference image stored in the storage unit with respect to the reproduction image generated by the reduction conversion unit. It is preferable that a reproduction image including a processing unit and processed by the image processing unit is stored in the storage unit.
- the third bit length has the same value as the first bit length.
- the encoding means encodes at least one of the information regarding the first, second and third bit lengths.
- the moving image decoding apparatus converts the target image having the pixel value represented by the first bit length so as to be represented by the second bit length.
- an input means for inputting a data stream including a residual signal generated by predictive coding and a reference image having a pixel value represented by a third bit length smaller than the second bit length are stored.
- Storage means for extracting the encoded data of the residual signal from the data stream and decoding the encoded data of the residual signal, and the encoded data of the residual signal decoded by the analyzing means
- a prediction signal is generated from a reference signal stored in a storage unit and a residual signal recovery unit that restores a reproduction residual signal
- an extended prediction signal is generated by converting the prediction signal to be represented by the second bit length Prediction signal Generating means, adding the extended prediction signal and the reproduction residual signal, thereby restoring an extended reproduction image, and converting the pixel value of the extended reproduction image into a reproduction image represented by a third bit length First reduced conversion means, and the reproduced image is stored in the storage means as a reference image.
- an extended reproduction image whose pixel value is expressed by a second bit length larger than the first bit length of the target image is restored from the input data stream, and the extended reproduction image has a pixel value of the second value. It is converted into a reproduced image represented by a third bit length smaller in value than the bit length, and this reproduced image is stored in a storage means (frame memory) as a reference image.
- a storage means frame memory
- bit length is converted to a bit length shorter than that at the time of decoding processing and stored in the frame memory, an increase in the capacity and bandwidth of the frame memory can be suppressed. As a result, it is possible to increase the encoding efficiency while suppressing an increase in the capacity and bandwidth of the frame memory.
- both the bit length of the reference image stored in the storage unit and the bit length of the reproduction image are the third bit length, when adding processing for processing the reproduction image using the reference image, It is no longer necessary to add processing to absorb the difference in bit length between the reference image and the playback image, and the implementation and processing costs associated with adding new processing such as image processing processing are reduced, and expansion is easy. Become.
- the moving image decoding apparatus processes the reproduced image using at least a part of the reference image stored in the storage unit with respect to the reproduced image generated by the first reduction conversion unit. It is preferable that the reproduced image processed by the image processing means is stored in the storage means.
- the third bit length has the same value as the first bit length.
- At least one piece of information regarding the first, second, and third bit lengths is included in the data stream, and the processing is performed after being decoded by the analysis unit.
- the moving image decoding apparatus further includes second reduction conversion means for converting the pixel value of the extended reproduction image into a reproduction image represented by the first bit length, and the reproduction image generated by the second reduction conversion means is It is preferable to be transmitted to the display device.
- the moving picture encoding apparatus and moving picture decoding apparatus can also be regarded as an invention relating to a method or an invention relating to a program, and can be described as follows.
- the invention relating to the method or the invention relating to the program has the same actions and effects.
- the moving image encoding method includes an input step of inputting a target image whose pixel value is represented by a first bit length, and each pixel of the target image having a second bit length greater than the first bit length.
- a prediction signal is generated from the image, the prediction signal is converted so as to be represented by the second bit length, and an extended prediction signal is generated, and a residual signal between the extended prediction signal and the expansion target image is generated
- a residual signal generation step, an encoding step for encoding the residual signal generated in the residual signal generation step, and the residual signal encoded in the encoding step is restored and added to the extended prediction signal ,
- Expansion A restoration step for generating a reproduction image, a reduction conversion step for converting a pixel value of the extended reproduction image into a reproduction image represented by a third bit length, and a storage step for storing the reproduction image in a storage
- the moving image coding method according to the present invention is an image in which a reproduced image is processed using at least a part of a reference image stored in a storage unit for the reproduced image generated in the reduction conversion step.
- the storage step includes storing the reproduced image processed in the image processing step in the storage means.
- a moving picture decoding method is generated by predictively encoding an extended target image obtained by converting a target image having a pixel value represented by a first bit length so as to be represented by a second bit length.
- An input step for inputting a data stream including the residual signal to be processed, an analysis step for extracting encoded data of the residual signal from the data stream and decoding the encoded data of the residual signal, and decoding in the analyzing step A residual signal restoring step for restoring the encoded data of the residual signal to a reproduced residual signal, and a reference image having a pixel value represented by a third bit length smaller than the second bit length
- a prediction signal generation step for generating a prediction signal from a reference image stored in the storage means, converting the prediction signal to be represented by the second bit length, and generating an extended prediction signal, and an extended prediction signal
- a reproduction residual signal for generating a prediction signal from a reference image stored in the storage means, converting the prediction signal to be represented by the second bit length, and generating an extended prediction
- the moving image decoding method processes the reproduced image using at least a part of the reference image stored in the storage unit with respect to the reproduced image generated in the first reduction conversion step.
- the storage step stores the reproduced image processed in the image processing step in the storage means.
- the moving image encoding program includes a computer, an input unit that inputs a target image whose pixel value is represented by a first bit length, and a second that has a value larger than the first bit length for each pixel of the target image.
- Extended conversion means for generating an image to be extended by being converted so as to be represented by a bit length, and storage means for storing a reference image having a pixel value represented by a third bit length that is smaller than the second bit length
- a prediction signal generating means for generating a prediction signal from a reference image stored in the storage means, converting the prediction signal to be represented by the second bit length, and generating an extended prediction signal
- an extended prediction signal and an extension target Residual signal generating means for generating a residual signal with an image, encoding means for encoding the residual signal generated by the residual signal generating means, and expanding after restoring the encoded residual signal
- Add to the predicted signal and expand Is a moving image encoding program for functioning as a reconstructing means for generating image data and a reduction conversion means for converting the pixel value of the extended reproduction image into a reproduction image represented by the third bit length, wherein the reproduction image is used as a reference image. It is stored in a storage means.
- the moving image encoding program uses a computer to reproduce a reproduced image using at least a part of the reference image stored in the storage unit with respect to the reproduced image generated by the reduction conversion unit. It is preferable that the replay image processed by the image processing unit is stored in the storage unit so as to function as an image processing unit for processing.
- the moving image decoding program predictively encodes an extended target image obtained by converting a target image having a pixel value represented by a first bit length so as to be represented by a second bit length.
- Input means for inputting a data stream including a residual signal generated by the storage means; storage means for storing a reference image having a pixel value represented by a third bit length smaller than the second bit length; Analyzing means for extracting encoded data of the residual signal from the data stream and decoding the encoded data of the residual signal, and reconstructing the encoded data of the residual signal decoded by the analyzing means into a reproduction residual signal
- a residual signal restoring unit that generates a prediction signal from a reference image stored in the storage unit, converts the prediction signal to be represented by a second bit length, and generates an extended prediction signal;
- Image restoration means for restoring the extended playback image by adding the extended prediction signal and the playback residual signal, and a first reduction for converting the pixel value of the extended playback image into a playback image represented
- the moving picture decoding program reproduces a reproduction image generated by the first reduction conversion means using at least a part of the reference image stored in the storage means. It is preferable that the reproduced image processed by the image processing unit is stored in the storage unit so that the image processing unit functions as an image processing unit.
- the moving image encoding device and the moving image decoding device according to the present invention can also be regarded as an invention related to a moving image encoding / decoding system including the same, and can be regarded as an invention related to a method, and a moving image including the same. It can also be understood as an invention relating to an image encoding / decoding method, and can be described as follows. These inventions have the same operations and effects as the moving image encoding device and the moving image decoding device.
- a moving image encoding / decoding system is a moving image encoding / decoding system for encoding and decoding moving image data, and a moving image encoding device that compresses and encodes moving image data;
- a video decoding device that decodes the video data compressed and encoded by the video encoding device, and the video encoding device inputs a target image whose pixel value is represented by a first bit length.
- a storage unit for storing a reference image having a pixel value represented by a 3-bit length and a prediction signal generated from the reference image stored in the storage unit so that the prediction signal is represented by a second bit length
- a signal generation unit a residual signal generation unit that generates a residual signal between the extended prediction signal and the expansion target image, an encoding unit that encodes the residual signal generated by the residual signal generation unit, and an encoding
- the restored residual signal is restored and added to the extended prediction signal to generate an extended playback image
- the reduction conversion means for converting the pixel value of the extended playback image into a playback image represented by the third bit length
- the reproduced image is stored in the storage means as a reference image
- the moving picture decoding apparatus selects a target image having a pixel value represented by a first bit length as a second bit.
- Input means for inputting a data stream including a residual signal generated by predictive encoding with respect to an extension target image converted as represented by a length, and a third bit length smaller than the second bit length It has a pixel value represented by Storage means for storing the reference image, analysis means for extracting the encoded data of the residual signal from the data stream and decoding the encoded data of the residual signal, and the residual decoded by the analyzing means
- a prediction signal is generated from a residual signal restoring means for restoring the encoded data of the signal to a reproduction residual signal and a reference image stored in the storage means, and the prediction signal is converted to be represented by the second bit length.
- Prediction signal generation means for generating an extended prediction signal
- image restoration means for restoring the extended reproduction image by adding the extended prediction signal and the reproduction residual signal
- First reduction conversion means for converting into a reproduced image represented, wherein the reproduced image is stored in the storage means as a reference image.
- a moving image encoding / decoding method is a moving image encoding / decoding method for encoding and decoding moving image data, and a moving image encoding method for compressing and encoding moving image data;
- a moving image decoding method for decoding moving image data compressed and encoded in the moving image encoding method, and the moving image encoding method inputs a target image whose pixel value is represented by a first bit length.
- a prediction signal is generated from a reference image stored in a storage unit that stores a reference image having a pixel value represented by a 3-bit length, the prediction signal is converted to be represented by a second bit length, and an extended prediction signal is converted
- Predictive signal generation step to be generated
- a residual signal generation step for generating a residual signal between the extended prediction signal and the expansion target image, an encoding step for encoding the residual signal generated in the residual signal generation step, and an encoding in the encoding step
- the restored residual signal is restored and added to the extended prediction signal to generate an extended playback image, and the reduction conversion for converting the pixel value of the extended playback image into the playback image represented by the third bit length
- a moving image decoding method that converts a target image having a pixel value represented by a first bit length so as to be represented by a second bit length.
- An input step for inputting a data stream including a residual signal generated by predictive encoding of the extended target image, and extracting encoded data of the residual signal from the data stream.
- An analysis step for decoding the encoded data of the residual signal, a residual signal recovery step for recovering the encoded data of the residual signal decoded in the analysis step to a reproduced residual signal, and a value from the second bit length
- a prediction signal generation step for generating an extended prediction signal, an image restoration step for restoring the extended playback image by adding the extended prediction signal and the playback residual signal, and a pixel value of the extended playback image as a third bit length.
- the first reduction conversion step for converting into a reproduced image represented by the following, and the storing step for storing the reproduced image in the storage means.
- the present invention it is possible to increase the encoding efficiency while suppressing an increase in the capacity and bandwidth of the frame memory, and it is easy to expand.
- the present embodiment is a moving image encoding / decoding system for encoding and decoding moving image data, including a moving image encoding device that compresses and encodes moving image data, and a compressed image encoded by the moving image encoding device. And a moving picture decoding device for decoding the converted moving picture data.
- a moving image encoding device that compresses and encodes moving image data
- a compressed image encoded by the moving image encoding device a moving picture decoding device for decoding the converted moving picture data.
- the video encoding device and the video decoding device will be described.
- FIG. 1 shows a block diagram of a moving picture coding apparatus 100 with bit length conversion according to an embodiment of the present invention.
- the moving image coding apparatus 100 includes an input terminal (input unit) 101, a bit length extension converter (extension conversion unit) 102, a block divider 103, a difference unit (residual signal generation unit) 104, a prediction signal generator (prediction).
- Signal generation means 105 prediction method determiner 106, compressor (encoding means) 110, decompressor (restoration means) 111, adder (restoration means) 112, bit length reduction converter (reduction conversion means) 113, frame A memory (storage means) 114, an entropy encoder (encoding means) 115, an image processor (image processing means) 116, and an output terminal 117 are provided.
- bit length of the image to be encoded is N bits (first bit length).
- the input N-bit image is converted by the bit length extension converter 102 into an extension target image having a bit length of M bits (second bit length).
- M is a positive integer greater than N.
- the bit length extension converter 102 converts an N-bit encoding target image into an M-bit extension target image.
- the bit extension method is not limited in the present invention, but there is, for example, a method of shifting an N-bit image signal to the left by (MN) bits.
- the lower (MN) signal value of the M-bit signal may be determined so that the coding efficiency is increased.
- the dynamic range of M bits may be controlled to be ⁇ 2 (M ⁇ 1) to 2 (M ⁇ 1) ⁇ 1 (not a non-negative integer variable but a signed number). Integer variables can be used).
- the block divider 103 divides the image to be encoded into a plurality of small regions (in this case, for example, blocks made up of 16 ⁇ 16 pixels). The following compression / encoding process is executed for each of the divided blocks.
- the prediction method determiner 106 and the prediction signal generator 105 perform the generation process of the M-bit extended prediction signal.
- the prediction method determiner 106 performs intra prediction and inter prediction, and uses a plurality of prediction methods with a small amount of code required for encoding the target block input via the line L103 and a small residual with the target block. Select from candidates.
- an M-bit signal is input via the line L103, and the prediction method determiner 106 also generates an M-bit pre-expanded prediction signal.
- prediction method candidates are not limited in the present invention, for example, a prediction signal is generated using an L-bit reference image stored in the frame memory 114, or is input to the bit length reduction converter 113. A method for generating a prediction signal using a previous M-bit reproduction signal is included.
- a method of generating a prediction signal of P bits (P is a positive number satisfying P> L) such as weighted addition of a plurality of L-bit reproduction pixels may be considered.
- an M-bit extended prediction signal is generated by a rounding method such as rounding off the P-bit prediction signal.
- an M-bit extended prediction signal is generated by shifting the P-bit prediction signal to the left by (MP) bits.
- Prediction mode information indicating the selected prediction method, motion information associated with inter-screen prediction, and the like are output as additional information to the entropy encoder 115 via the line L118.
- this additional information is entropy encoded by a method such as a variable length code or an arithmetic code together with the quantized transform coefficient input via L110.
- the prediction signal generator 105 generates an M-bit extended prediction signal based on the additional information input via the L106, and outputs it to the differencer 104 and the adder 112 via the line L105.
- the prediction signal generator 105 and the prediction method determiner 106 include processing for extending the bit length from L bits to M bits.
- the M-bit extended prediction signal generated by the prediction signal generator 105 is output to the differentiator 104 via the line L105, and the differencer 104 receives the extended prediction signal from the M-bit signal of the target block input via the line L103.
- a residual signal is generated by subtracting.
- the generated residual signal is input to the compressor 110 via L104 and compressed into data (encoded data) with a small amount of information.
- the compressor 110 is generally composed of a converter that converts a difference signal into a frequency domain transform coefficient and a quantizer that quantizes the transform coefficient, but one of them may be omitted, or another structure may be used. Good.
- the bit length of the quantized transform coefficient is M bits, but the intermediate processing in the compressor may be a signal having a bit length longer than M bits. For example, since the residual signal may be a negative value, it usually has a bit length of (M + 1) bits. If the conversion coefficient has a bit length longer than (M + 1) bits, the conversion efficiency increases.
- the quantizer rounds the quantized transform coefficient into an M-bit signal and outputs it to the entropy encoder 115 and the decompressor 111 via L110.
- the entropy encoder 115 converts the quantized transform coefficient into a variable length code and outputs it from the output terminal 117 as a bit stream. Note that arithmetic coding may be applied instead of the variable-length code.
- the decompressor 111 and the adder 112 decode the quantized transform coefficient that has been encoded data, and generate an M-bit extended reproduction signal.
- the decompressor 111 is generally composed of an inverse quantizer that inversely quantizes a quantized transform coefficient into a transform coefficient, and an inverse transformer that inversely transforms the transform coefficient and reproduces a residual signal. Alternatively, another configuration may be used.
- the adder 112 restores the M-bit extended reproduction signal by adding the extended prediction signal to the reproduced residual signal.
- the bit length of the extended reproduction signal is M bits, but the intermediate processing of the decompressor may be a signal having a bit length longer than M bits.
- the residual signal may be a negative value, it normally has a bit length of M + 1 bits.
- the inversely quantized transform coefficient is set to a bit length longer than M + 1 bits.
- the bit length reduction converter 113 converts the M-bit reproduction signal into an L-bit (third bit length) reproduction signal.
- the bit length reduction converter 113 converts the M-bit reproduction signal into an L-bit reproduction signal.
- the method of bit length conversion is not limited in the present invention. For example, a rounding method by rounding off, more specifically, 2 (ML-1) is added to an L-bit reproduction signal, and then (ML) There is a way to shift right by bits. Further, rounding by rounding off may be used instead of quadrupling, or another rounding method may be used. If the dynamic range of the M-bit signal is controlled as ⁇ 2 (M ⁇ 1) to 2 (M-1) ⁇ 1, the dynamic range of the L-bit signal is set to 0 to 0 after rounding processing. It is necessary to perform clipping processing to 2 L ⁇ 1.
- the L-bit reproduction signal is input to the image processor 116 via the line L113.
- the reproduction signal is subjected to image quality improvement processing or H.264 as shown in, for example, US Patent Application Publication No. 2006/153301. Block noise removal processing as defined in H.264 is performed.
- the L-bit reproduction signal restored in this way is stored in the frame memory 114 because it is used as a reference image for encoding the next image. Since the image processor 116 performs signal processing such as the above-described image quality improvement processing and block noise removal processing between the target blocks, in addition to the reproduction signal input via the line L113, the reproduction already stored in the frame memory 114 is performed. Use part or all of the signal.
- the final bit stream is generated by performing these processes on all target blocks.
- the moving picture decoding apparatus needs to know the values of N, M, and L representing the bit length. is there. These values may be determined in advance, but any one, two, or all of them may be determined by the encoding device and encoded in sequence units or frame units.
- the values of N and L are values related to the device configuration, and are usually fixed values.
- the value of M is a value indicating the processing accuracy in the compressor or decompressor, and can be changed in units of frames or blocks. Therefore, the value of M may be determined for each frame or block, and the value may be encoded.
- a plurality of sets of bit length N, M, and L values used in the bit length extension converter 102, the bit length reduction converter 113, the prediction method determiner 106, and the like are prepared in advance in the moving image encoding apparatus 100.
- a set of bit lengths N, M, and L is selected according to a command from a control unit (not shown), and the encoding process is performed.
- This is performed for all sets of bit lengths N, M, and L, and the encoded data in each case is compared by the entropy encoder 115, and the bit length of the encoded data is the shortest and the compression rate is the highest. A good one is selected.
- part or all of the values of the bit lengths N, M, and L are encoded by the entropy encoder 115 and included in the bit stream data together with the encoded data.
- the bit length extension converter 102 converts the target image into an extension target image
- the block splitter 103 divides the extension target block into target blocks.
- the moving image encoding apparatus 100-2 in FIG. 2 divides the extension target block into target blocks by the block divider 103, and then converts the target image to the extension target image by the bit length extension converter 102. This is different from the moving picture coding apparatus 100.
- the prediction signal generator 105 generates an M-bit extended prediction signal using an L-bit reference image.
- the prediction signal generator 105a generates an L-bit prediction signal once, and the bit length extension converter 105b converts the L-bit prediction signal into M It is different from the video encoding apparatus 100 in that it is extended to a bit prediction signal.
- N L is considered.
- the N-bit signal of the target block divided by the block divider 103 is input to the prediction method determiner 106-2 via the line L103.
- the prediction method determiner 106-2 generates a plurality of prediction signals using the N-bit reference image or the N-bit reproduction signal converted by the bit length reduction converter 113, and selects an optimal prediction method. To do.
- the prediction signal generator 105a generates an N-bit prediction signal.
- the generated N-bit prediction signal is input to the bit length extension converter 105b via the line L105a and converted to an M-bit extension prediction signal.
- bit length conversion technique that is a feature of the present invention is also effective in an apparatus configuration having the configurations of the moving image encoding apparatuses 100 and 100-2 shown in FIGS. 1 and 2 at the same time.
- a prediction method candidate by the prediction method determiners 106 and 106-2 a method of directly generating an M-bit extended prediction signal from an L-bit reference image or a once L-bit prediction signal is generated.
- a method of converting into an M-bit prediction signal by a bit length extension converter is included.
- FIG. 3 shows a flowchart of a moving image encoding process with bit length conversion executed by the moving image encoding apparatus 100.
- the bit length extension converter 102 expands the N-bit target image to M bits (M> N).
- M M> N
- the image is converted into a target image, and the block dividing unit 103 further divides the expansion target image into a plurality of small blocks (step 302: extended conversion step).
- step 302 extended conversion step
- the prediction method determiner 106 and the prediction signal generator 105 determine one prediction method from among a plurality of prediction methods using the L-bit reference image stored in the frame memory 114 for each target block. Then, an M-bit extended prediction signal is generated. At the same time, additional information required to generate this prediction signal, such as prediction mode information indicating the selected prediction method and motion information associated with inter-screen prediction, is generated (step 303: prediction signal generation step).
- the prediction signal generation method includes a method of generating an M-bit prediction signal directly from an L-bit signal, or an L-bit prediction signal generated once and then an M-bit by the bit length extension converter 105b. A method for converting to an extended prediction signal is included.
- the differentiator 104 generates a residual image between the M-bit extension target image and the M-bit predicted image (step 304: residual signal generation step), and the compressor 110 converts and quantizes the residual image,
- the encoding information of the difference image is generated (step 305: encoding step).
- the decompressor 111 restores the encoded information by inverse quantization and inverse transform, and the adder 112 adds the restored residual image and the predicted image to generate an M-bit extended reproduction image (step) 306: Restoration step).
- the bit length reduction converter 113 converts the M-bit extended playback image into an L-bit playback image (step 307: reduction conversion step).
- the image processor 116 performs processing on the L-bit reconstructed image by a technique as shown in, for example, US Patent Application Publication No. 2006/153301, and uses the reconstructed image after processing as a reference image when generating a prediction signal. It is stored in the frame memory 114 for use (step 308: image processing step, storage step). At this time, the image processor 116 uses the reproduction signal already stored in the frame memory 114 in addition to the reproduction signal converted into L bits in order to perform signal processing between the target blocks.
- the generated additional information and encoded information are compressed into bit stream data by the entropy encoder 115 (step 309). When it is necessary to encode any of the number of bits N, M, and L, it is encoded by the entropy encoder 115 and included in the bit stream data.
- bit length conversion processing in the present invention is not limited to a specific bit length expansion method, a bit length reduction method, and a prediction method.
- the final bit stream is generated by performing these steps for all target blocks.
- FIG. 4 shows a block diagram of a moving picture decoding apparatus 500 with bit length conversion according to the present invention.
- the moving picture decoding apparatus 500 includes an input terminal (input means) 501, a data analyzer (analysis means) 502, a decompressor (residual signal restoration means) 503, an adder (image restoration means) 504, a prediction signal generator (prediction).
- the input terminal 501 receives a bit stream including additional information required for generating the extended prediction signal of each target block and encoded data of the residual signal of the target block.
- a bit stream obtained by processing by the video encoding device 100 in FIG. 1 is input to the video decoding device 500.
- the data analyzer 502 analyzes the input data (input bit stream) and decodes the encoded data (quantized transform coefficient) and additional information of the residual signal. Further, when the input data includes any value of M, N, and L, which is information indicating the bit length, it is decoded and notified to a bit length reduction converter and a prediction signal generator described later. . As a decoding method, variable length decoding or arithmetic decoding is used.
- the encoded data (quantized transform coefficient) of the decoded residual signal is input to the decompressor 503 via the line L502a and restored to the residual signal.
- the decompressor 503 is generally composed of an inverse quantizer that inversely quantizes a quantized transform coefficient into a transform coefficient, and an inverse transformer that inversely transforms the transform coefficient and reproduces a residual signal. Alternatively, another configuration may be used.
- the additional information decoded by the data analyzer 502 is sent to the prediction signal generator 505 via the line L502b.
- the prediction signal generator 505 Based on the additional information, the prediction signal generator 505 generates an M-bit extended prediction signal in the same procedure as the prediction signal generator 105 of the video encoding device.
- the adder 504 generates an M-bit extended reproduction signal by adding the extended prediction signal and the restored residual signal.
- the bit length of the extended reproduction signal is M bits
- an intermediate process such as the decompressor 503 and the adder 504 may be a signal having a bit length longer than M bits.
- the residual signal may be a negative value, it usually has a bit length of (M + 1) bits.
- the inversely quantized transform coefficient may have a bit length longer than (M + 1) bits.
- the bit length reduction converter 506 converts an M-bit reproduction signal into an L-bit reproduction signal.
- the L-bit reproduction signal is input to the image processor 507 via the line L506.
- the reproduction signal is subjected to image quality improvement processing such as shown in US Patent Application Publication No. 2006/153301 or H.264. Block noise removal processing as defined in H.264 is performed.
- the L-bit reproduction signal restored in this way is stored in the frame memory 508 because it is used as a reference image when generating a prediction signal.
- the image processor 507 uses a reproduction signal already stored in the frame memory 508 in addition to the reproduction signal input via the line L506 in order to perform signal processing between blocks.
- the moving image data is restored by repeating these processes until all the data of the bit stream is processed.
- the bit length reduction converter (second reduction conversion means) 506 converts the M-bit reproduction signal into an L-bit reproduction signal
- the bit length reduction converter 510 converts the M-bit reproduction signal into an N-bit reproduction signal.
- FIG. 6 shows a configuration of a moving picture decoding apparatus 500-3 that decodes bitstream data generated by a moving picture encoding apparatus 100-2, which is a modification of the moving picture encoding apparatus 100 described above.
- N L is considered.
- the prediction signal generator 505a an N-bit prediction signal is generated and input to the bit length extension converter 505b via the line L505a.
- the bit length extension converter 505b the N-bit prediction signal is extended to an M-bit extension prediction signal and output to the adder 504 via the line L505.
- bit length conversion technique that is a feature of the present invention is also effective in an apparatus configuration having the configurations of the moving picture decoding apparatuses 500 and 500-3 shown in FIGS. 4 and 6 at the same time.
- a prediction mode in the prediction signal generators 505 and 505a is a method of directly generating an M-bit extended prediction signal from an L-bit reference image, or a bit length after generating an L-bit prediction signal once.
- a method of converting into an M-bit prediction signal by an extension converter is included and is selectively processed according to the decoded additional information.
- FIG. 7 shows a flowchart of a moving picture decoding process with bit length conversion, which is executed by the moving picture decoding apparatus 500.
- the compression-coded data is input to the input terminal 501 (step 701: input step).
- the data analyzer 502 performs entropy decoding on the input data, and extracts encoded information (quantized transform coefficients) and additional information (step 702: analysis step).
- the input data includes M, N, and L values, they are decoded and used for bit length reduction conversion and prediction signal generation processing described later.
- the prediction signal generator 505 decodes the additional information and generates an M-bit extended prediction signal using the L-bit reproduced image (step 703: prediction signal generation step).
- the prediction signal generation method includes a method of generating an M-bit prediction signal directly from an L-bit signal, or an M-bit extension by the bit length extension converter 505b after generating an L-bit prediction signal once. A method for converting to a prediction signal is included.
- the decompressor 503 dequantizes the extracted quantized transform coefficient to restore the transform coefficient, inversely transforms the transform coefficient, and restores the residual signal (step 704: residual signal restoration step).
- the adder 504 adds the extended prediction signal and the restored residual signal to generate an M-bit extended reproduction image (step 705: image restoration step).
- the bit length reduction converter converts the M-bit extended playback image into an L-bit playback image (step 706: first reduction conversion step).
- N L.
- the image processor 507 performs processing on the L-bit reproduced image by a technique as shown in, for example, US Patent Application Publication No. 2006/153301, and uses the processed reproduced image as a reference image when generating a prediction signal. It is stored in the frame memory 508 for use (step 707: image processing step, storage step). In order to perform signal processing between target blocks, the image processor 507 uses a reproduction signal already stored in the frame memory 508 in addition to the reproduction signal converted into L bits.
- the moving image data is restored by repeating these steps until all the data of the bit stream is processed.
- bit length conversion processing in the present invention is not limited to a specific bit length expansion method, a bit length reduction method, and a prediction method.
- the invention relating to the moving image encoding apparatus 100 can be understood as an invention relating to a moving image encoding program for causing a computer to function as a moving image encoding apparatus.
- the moving picture coding method according to the present embodiment can be provided as a program stored in a recording medium.
- the invention relating to the moving picture decoding apparatus 500 can be understood as an invention relating to a moving picture decoding program for causing a computer to function as a moving picture decoding apparatus or a moving picture encoding method.
- the moving picture decoding method according to the present embodiment can be provided as a program stored in a recording medium.
- the moving image encoding program and the moving image decoding program are provided by being stored in a recording medium, for example.
- the recording medium include a recording medium such as a flexible disk, a CD-ROM, a DVD, a recording medium such as a ROM, or a semiconductor memory.
- FIG. 8 is a block diagram showing modules of a program that can execute the moving picture coding method.
- the moving image encoding program P100 includes a block division module P101, a prediction method determination module P102, a prediction signal generation module P103, a storage module P104, a subtraction module P105, a compression module P106, an expansion module P107, an addition module P108, and a bit length extension module P109.
- each module of the image predictive coding program P100 is as follows: block divider 103, prediction method determiner 106, prediction signal generator 105, frame memory 114, subtractor 104, compressor 110, decompressor 111, adder 112, the bit length extension converter 102, the bit length reduction converter 113, the image processor 116, and the entropy encoder 115 have the same functions.
- FIG. 9 is a block diagram showing a module of a program that can execute the moving picture decoding method.
- the moving image decoding program P500 includes a data analysis module P501, a prediction signal generation module 502, a storage module 503, an expansion module P504, an addition module P505, a bit length reduction module P506, and an image processing module P507.
- each module of the moving picture decoding program P500 are the functions of the data analyzer 502, the prediction signal generator 505, the frame memory 508, the decompressor 503, the adder 504, the bit length reduction converter 506, and the image processor 507. It is the same.
- the moving picture encoding program P100 or the moving picture decoding program P500 configured as described above is stored in the recording medium 10 and executed by a computer to be described later.
- FIG. 10 is a diagram illustrating a hardware configuration of the computer 30 for executing the program recorded on the recording medium 10
- FIG. 11 is a perspective view of the computer 30 for executing the program recorded on the recording medium 10.
- the computer 30 includes a DVD player, a set top box, a mobile phone, and the like that have a CPU and perform processing and control by software.
- a computer 30 includes a reading device 12 such as a flexible disk drive device, a CD-ROM drive device, a DVD drive device, a working memory (RAM) 14 in which an operating system is resident, and a recording medium 10.
- a memory 16 for storing the program stored therein, a display 18, a mouse 20 and a keyboard 22 as input devices, a communication device 24 for transmitting and receiving data and the like, and a CPU 26 for controlling execution of the program. ing.
- the computer 30 can access the moving image encoding program and the moving image decoding program stored in the recording medium 10 from the reading device 12, and the moving image encoding program And the moving picture decoding program enables the computer 30 to operate as a moving picture encoding apparatus and a moving picture decoding apparatus according to the present invention.
- the moving picture encoding program and the moving picture decoding program may be provided as a computer data signal 40 superimposed on a carrier wave via a wired network / wireless network.
- the computer 30 can store the moving image encoding program and the moving image decoding program received by the communication device 24 in the memory 16 and execute the moving image encoding program and the moving image decoding program.
- the target image whose pixel value is represented by the bit length N is converted by the bit length extension converter 102 so that each pixel value has the bit length M.
- the image is encoded by the compressor 110, and the encoded image is restored by the decompressor 111, and the pixel value is converted from the bit length M by the bit length reduction converter 113. It is converted into a reproduction image represented by a bit length L having a small value, and this reproduction image is stored in the frame memory 114 as a reference image.
- each pixel of the image signal to be encoded is converted into a bit length longer than the bit length of the target signal, and then the encoding process is performed in the compressor 110, thereby enabling high-precision calculation of the encoding process.
- Encoding efficiency can be increased.
- the data is converted into the bit length L shorter than the bit length M when the encoding process is performed in the compressor 110 and stored in the frame memory 114, an increase in the capacity and bandwidth of the frame memory can be suppressed.
- the pixel value is converted from the data stream input via the input terminal 501 by the data analyzer 502 and the decompressor 503.
- the extended reproduction image represented by the bit length M larger than the bit length N of the image is restored, and the extended reproduction image is represented by the bit length reduction converter 506 with the bit length L having a pixel value smaller than the bit length M.
- the reproduced image is converted into a reproduced image and stored in the frame memory 508 as a reference image.
- each pixel of the image signal to be encoded is converted into a bit length longer than the bit length of the target signal, and the data analyzer 502 and the decompressor 503 perform the decoding process.
- Precision calculation can be performed, and encoding efficiency can be increased.
- the data analyzer 502 and the decompressor 503 convert the bit length to a bit length shorter than that when the decoding process is performed and store it in the frame memory 508, the increase in the capacity and bandwidth of the frame memory 508 is suppressed. Can do.
- the bit length of the reference image stored in the frame memories 114 and 508 is both the bit length L. For this reason, it is necessary to separately add a process for absorbing the difference in bit length between the reference image and the reproduced image even when the image processor 116 or 507 performs the process of processing the reproduced image using the reference image. Therefore, the mounting and processing costs associated with adding new processing such as image processing processing are reduced, and expansion is easy.
- each pixel of the image signal to be encoded is converted into a bit length longer than the bit length of the target signal without increasing the capacity of the frame memory.
- Decryption processing is performed. Therefore, it is possible to perform encoding / decoding processing with high accuracy without increasing the memory bandwidth to the frame memory and to increase the encoding efficiency.
- the image processors 116 and 507 after converting a reproduction signal having a long bit length into a signal having a short bit length, the image processors 116 and 507 perform image signal processing using the signals stored in the frame memory. Therefore, the processing can be performed without adding a bit length conversion to the signal stored in the frame memory.
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Abstract
Description
図1に、本発明の一実施形態に係るビット長変換を伴う動画像符号化装置100のブロック図を示す。動画像符号化装置100は、入力端子(入力手段)101、ビット長拡張変換器(拡張変換手段)102、ブロック分割器103、差分器(残差信号生成手段)104、予測信号生成器(予測信号生成手段)105、予測方法決定器106、圧縮器(符号化手段)110、伸張器(復元手段)111、加算器(復元手段)112、ビット長縮小変換器(縮小変換手段)113、フレームメモリ(格納手段)114、エントロピー符号化器(符号化手段)115、画像処理器(画像処理手段)116、及び、出力端子117を備えている。
図3には、動画像符号化装置100により実行される、ビット長変換を伴う動画像符号化処理の流れ図を示す。符号化対象の画像がNビット信号で入力端子101に入力されると(ステップ301:入力ステップ)、ビット長拡張変換器102により、このNビットの対象画像がMビット(M>N)の拡張対象画像に変換され、さらにブロック分割器103により、この拡張対象画像が複数の小ブロックに分割される(ステップ302:拡張変換ステップ)。なお、ビット長拡張変換とブロック分割の処理の順序は逆でもよい。
図4に、本発明によるビット長変換を伴う動画像復号装置500のブロック図を示す。動画像復号装置500は、入力端子(入力手段)501、データ解析器(解析手段)502、伸張器(残差信号復元手段)503、加算器(画像復元手段)504、予測信号生成器(予測信号生成手段)505、ビット長縮小変換器(第1の縮小変換手段)506、画像処理器(画像処理手段)507、フレームメモリ(格納手段)508、及び、画像出力端子509を備えている。
図7には、動画像復号装置500により実行される、ビット長変換を伴う動画像復号処理の流れ図を示す。圧縮符号化されたデータが入力端子501に入力される(ステップ701:入力ステップ)。次に、データ解析器502は、入力されたデータをエントロピー復号し、符号化情報(量子化変換係数)、及び付加情報を抽出する(ステップ702:解析ステップ)。この際、入力データにM、N、Lの値が含まれる場合には、復号され、後述するビット長縮小変換や予測信号生成処理に用いられる。
動画像符号化装置100に係る発明は、コンピュータを動画像符号化装置として機能させるための動画像符号化プログラムに係る発明として捉えることができる。あるいは、本実施形態に係る動画像符号化方法をプログラムとして記録媒体に格納して提供することもできる。また、動画像復号装置500に係る発明は、コンピュータを動画像復号装置あるいは動画像符号化方法として機能させるための動画像復号プログラムに係る発明として捉えることができる。あるいは本実施形態に係る動画像復号方法をプログラムとして記録媒体に格納して提供することもできる。動画像符号化プログラム及び動画像復号プログラムは、例えば、記録媒体に格納されて提供される。記録媒体としては、フレキシブルディスク、CD-ROM、DVD等の記録媒体、あるいはROM等の記録媒体、あるいは半導体メモリ等が例示される。
Claims (19)
- 画素値が第1ビット長で表される対象画像を入力する入力手段と、
前記対象画像の各画素を第1ビット長より値の大きい第2ビット長で表されるように変換し拡張対象画像を生成する拡張変換手段と、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段と、
前記格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成手段と、
前記拡張予測信号と前記拡張対象画像との残差信号を生成する残差信号生成手段と、
前記残差信号生成手段により生成された残差信号を符号化する符号化手段と、
前記符号化された残差信号を復元した上で前記拡張予測信号に加算し、拡張再生画像を生成する復元手段と
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する縮小変換手段と、を備え、
前記再生画像が参照画像として前記格納手段に格納される
ことを特徴とする動画像符号化装置。 - 前記縮小変換手段によって生成された前記再生画像に対して、前記格納手段に格納されている前記参照画像の少なくとも一部を用いて、前記再生画像を加工処理する画像処理手段を備え、
前記画像処理手段により加工処理された再生画像が前記格納手段に格納されることを特徴とする、請求項1に記載の動画像符号化装置。 - 前記第3ビット長は第1ビット長と同じ値を有することを特徴とする、請求項2に記載の動画像符号化装置。
- 前記符号化手段が、前記第1、第2及び第3のビット長に関する情報のうち少なくとも1つを符号化することを特徴とする、請求項1に記載の動画像符号化装置。
- 第1ビット長で表される画素値を有する対象画像を第2ビット長で表されるように変換した拡張対象画像に対し、予測符号化することによって生成される残差信号を含むデータストリームを入力する入力手段と、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段と、
前記データストリームの中から前記残差信号の符号化データを抽出して前記残差信号の符号化データを復号する解析手段と、
前記解析手段により復号された前記残差信号の符号化データを再生残差信号に復元する残差信号復元手段と、
前記格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成手段と、
前記拡張予測信号と前記再生残差信号とを加算することによって、拡張再生画像を復元する画像復元手段と、
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する第1の縮小変換手段と、を備え、
前記再生画像が参照画像として前記格納手段に格納される
ことを特徴とする動画像復号装置。 - 前記第1の縮小変換手段によって生成された再生画像に対して、前記格納手段に格納されている前記参照画像の少なくとも一部を用いて、前記再生画像を加工処理する画像処理手段を備え、
前記画像処理手段により加工処理された再生画像が前記格納手段に格納されることを特徴とする、請求項5に記載の動画像復号装置。 - 前記第3ビット長は第1ビット長と同じ値を有することを特徴とする、請求項6に記載の動画像復号装置。
- 前記第1、第2及び第3のビット長に関する情報の少なくとも1つが前記データストリームに含まれており、前記解析手段によって復号された上で処理を行うことを特徴とする、請求項5に記載の動画像復号装置。
- 前記拡張再生画像の画素値を第1ビット長で表される再生画像に変換する第2の縮小変換手段を備え、前記第2の縮小変換手段で生成された再生画像が表示装置に送信されることを特徴とする、請求項5に記載の動画像復号装置。
- 画素値が第1ビット長で表される対象画像を入力する入力ステップと、
前記対象画像の各画素を第1ビット長より値の大きい第2ビット長で表されるように変換し拡張対象画像を生成する拡張変換ステップと、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納する格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成ステップと、
前記拡張予測信号と前記拡張対象画像との残差信号を生成する残差信号生成ステップと、
前記残差信号生成ステップにおいて生成された残差信号を符号化する符号化ステップと、
前記符号化ステップにおいて符号化された残差信号を復元した上で前記拡張予測信号に加算し、拡張再生画像を生成する復元ステップと、
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する縮小変換ステップと、
前記再生画像を前記格納手段に格納する格納ステップと、
を備えることを特徴とする動画像符号化方法。 - 前記縮小変換ステップにおいて生成された再生画像に対して、前記格納手段に格納されている前記参照画像の少なくとも一部を用いて、前記再生画像を加工処理する画像処理ステップを備え、
前記格納ステップは、前記画像処理ステップにおいて加工処理された再生画像を前記格納手段に格納することを特徴とする、請求項10に記載の動画像符号化方法。 - 第1ビット長で表される画素値を有する対象画像を第2ビット長で表されるように変換した拡張対象画像に対し、予測符号化することによって生成される残差信号を含むデータストリームを入力する入力ステップと、
前記データストリームの中から前記残差信号の符号化データを抽出して前記残差信号の符号化データを復号する解析ステップと、
前記解析ステップにおいて復号された前記残差信号の符号化データを再生残差信号に復元する残差信号復元ステップと、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成ステップと、
前記拡張予測信号と前記再生残差信号とを加算することによって、拡張再生画像を復元する画像復元ステップと、
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する第1の縮小変換ステップと、
前記再生画像を前記格納手段に格納する格納ステップと、
を備えることを特徴とする動画像復号方法。 - 前記第1の縮小変換ステップにおいて生成された再生画像に対して、前記格納手段に格納されている前記参照画像の少なくとも一部を用いて、前記再生画像を加工処理する画像処理ステップを備え、
前記格納ステップは、前記画像処理ステップにおいて加工処理された再生画像を前記格納手段に格納することを特徴とする、請求項12に記載の動画像復号方法。 - コンピュータを、
画素値が第1ビット長で表される対象画像を入力する入力手段と、
前記対象画像の各画素を第1ビット長より値の大きい第2ビット長で表されるように変換し拡張対象画像を生成する拡張変換手段と、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段と、
前記格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成手段と、
前記拡張予測信号と前記拡張対象画像との残差信号を生成する残差信号生成手段と、
前記残差信号生成手段により生成された残差信号を符号化する符号化手段と、
前記符号化された残差信号を復元した上で前記拡張予測信号に加算し、拡張再生画像を生成する復元手段と
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する第1の縮小変換手段
として機能させるための動画像符号化プログラムであって、
前記再生画像が参照画像として前記格納手段に格納される
ことを特徴とする動画像符号化プログラム。 - コンピュータを、さらに
前記縮小変換手段によって生成された前記再生画像に対して、前記格納手段に格納されている前記参照画像の少なくとも一部を用いて、前記再生画像を加工処理する画像処理手段として機能させ、
前記画像処理手段により加工処理された再生画像が前記格納手段に格納されることを特徴とする、請求項14に記載の動画像符号化プログラム。 - コンピュータを、
第1ビット長で表される画素値を有する対象画像を第2ビット長で表されるように変換した拡張対象画像に対し、予測符号化することによって生成される残差信号を含むデータストリームを入力する入力手段と、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段と、
前記データストリームの中から前記残差信号の符号化データを抽出して前記残差信号の符号化データを復号する解析手段と、
前記解析手段により復号された前記残差信号の符号化データを再生残差信号に復元する残差信号復元手段と、
前記格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成手段と、
前記拡張予測信号と前記再生残差信号とを加算することによって、拡張再生画像を復元する画像復元手段と、
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する第1の縮小変換手段
として機能させるため動画像復号プログラムであって、
前記再生画像が参照画像として前記格納手段に格納される
ことを特徴とする動画像復号プログラム。 - コンピュータを、さらに
前記第1の縮小変換手段によって生成された再生画像に対して、前記格納手段に格納されている前記参照画像の少なくとも一部を用いて、前記再生画像を加工処理する画像処理手段として機能させ、
前記画像処理手段により加工処理された再生画像が前記格納手段に格納されることを特徴とする、請求項16に記載の動画像復号プログラム。 - 動画像データを符号化及び復号するための動画像符号化・復号システムであって、
前記動画像データを圧縮符号化する動画像符号化装置と、
前記動画像符号化装置により圧縮符号化された動画像データを復号する動画像復号装置と、を具備し、
前記動画像符号化装置が、
画素値が第1ビット長で表される対象画像を入力する入力手段と、
前記対象画像の各画素を第1ビット長より値の大きい第2ビット長で表されるように変換し拡張対象画像を生成する拡張変換手段と、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段と、
前記格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成手段と、
前記拡張予測信号と前記拡張対象画像との残差信号を生成する残差信号生成手段と、
前記残差信号生成手段により生成された残差信号を符号化する符号化手段と、
前記符号化された残差信号を復元した上で前記拡張予測信号に加算し、拡張再生画像を生成する復元手段と
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する縮小変換手段と、を備え、
前記再生画像が参照画像として前記格納手段に格納されることを特徴とするものであり、
前記動画像復号装置が、
第1ビット長で表される画素値を有する対象画像を第2ビット長で表されるように変換した拡張対象画像に対し、予測符号化することによって生成される残差信号を含むデータストリームを入力する入力手段と、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段と、
前記データストリームの中から前記残差信号の符号化データを抽出して前記残差信号の符号化データを復号する解析手段と、
前記解析手段により復号された前記残差信号の符号化データを再生残差信号に復元する残差信号復元手段と、
前記格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成手段と、
前記拡張予測信号と前記再生残差信号とを加算することによって、拡張再生画像を復元する画像復元手段と、
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する第1の縮小変換手段と、を備え、
前記再生画像が参照画像として前記格納手段に格納される
ことを特徴とする、動画像符号化・復号システム。 - 動画像データを符号化及び復号するための動画像符号化・復号方法であって、
前記動画像データを圧縮符号化する動画像符号化方法と、
前記動画像符号化方法において圧縮符号化された動画像データを復号する動画像復号方法と、を具備し、
前記動画像符号化方法が、
画素値が第1ビット長で表される対象画像を入力する入力ステップと、
前記対象画像の各画素を第1ビット長より値の大きい第2ビット長で表されるように変換し拡張対象画像を生成する拡張変換ステップと、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納する格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成ステップと、
前記拡張予測信号と前記拡張対象画像との残差信号を生成する残差信号生成ステップと、
前記残差信号生成ステップにおいて生成された残差信号を符号化する符号化ステップと、
前記符号化ステップにおいて符号化された残差信号を復元した上で前記拡張予測信号に加算し、拡張再生画像を生成する復元ステップと、
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する縮小変換ステップと、
前記再生画像を前記格納手段に格納する格納ステップと、を備え、
前記動画像復号方法が、
第1ビット長で表される画素値を有する対象画像を第2ビット長で表されるように変換した拡張対象画像に対し、予測符号化することによって生成される残差信号を含むデータストリームを入力する入力ステップと、
前記データストリームの中から前記残差信号の符号化データを抽出して前記残差信号の符号化データを復号する解析ステップと、
前記解析ステップにおいて復号された前記残差信号の符号化データを再生残差信号に復元する残差信号復元ステップと、
前記第2ビット長より値の小さい第3ビット長で表される画素値を有する参照画像を格納するための格納手段に格納される前記参照画像より予測信号を生成し、前記予測信号を第2ビット長で表されるように変換し拡張予測信号を生成する予測信号生成ステップと、
前記拡張予測信号と前記再生残差信号とを加算することによって、拡張再生画像を復元する画像復元ステップと、
前記拡張再生画像の画素値を第3ビット長で表される再生画像に変換する第1の縮小変換ステップと、
前記再生画像を前記格納手段に格納する格納ステップと、
を備える動画像符号化・復号方法。
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2009
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- 2009-09-08 EP EP20090817624 patent/EP2337357A4/en not_active Ceased
- 2009-09-08 KR KR20107029505A patent/KR20110074957A/ko not_active Application Discontinuation
- 2009-09-08 MX MX2011003499A patent/MX2011003499A/es not_active Application Discontinuation
- 2009-09-08 RU RU2011117204/07A patent/RU2011117204A/ru unknown
- 2009-09-08 CN CN2009801388327A patent/CN102172029A/zh active Pending
- 2009-09-08 BR BRPI0920532A patent/BRPI0920532A2/pt not_active IP Right Cessation
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- 2009-09-08 AU AU2009299222A patent/AU2009299222A1/en not_active Abandoned
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US9532073B2 (en) | 2010-07-13 | 2016-12-27 | Nec Corporation | Video encoding device, video decoding device, video decoding method, video decoding method, and program |
US9936212B2 (en) | 2010-07-13 | 2018-04-03 | Nec Corporation | Video encoding device, video decoding device, video encoding method, video decoding method, and program |
US10097847B2 (en) | 2010-07-13 | 2018-10-09 | Nec Corporation | Video encoding device, video decoding device, video encoding method, video decoding method, and program |
KR101435095B1 (ko) * | 2010-07-13 | 2014-08-28 | 닛본 덴끼 가부시끼가이샤 | 영상 부호화 장치, 영상 복호 장치, 영상 부호화 방법, 영상 복호 방법 및 프로그램을 기록한 컴퓨터 판독 가능한 정보 기록 매체 |
KR101538362B1 (ko) * | 2010-07-13 | 2015-07-22 | 닛본 덴끼 가부시끼가이샤 | 영상 복호 장치, 영상 복호 방법 및 영상 복호 프로그램을 저장한 컴퓨터 판독 가능한 저장 매체 |
US9210427B2 (en) | 2010-07-13 | 2015-12-08 | Nec Corporation | Video encoding device, video decoding device, video encoding method, video decoding method, and program |
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WO2012008130A1 (ja) * | 2010-07-13 | 2012-01-19 | 日本電気株式会社 | 映像符号化装置、映像復号装置、映像符号化方法、映像復号方法及びプログラム |
US8699804B2 (en) * | 2011-01-31 | 2014-04-15 | Korea Electronics Technology Institute | Lossless image compression and decompression method for high definition image and electronic device using the same |
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JP2012195959A (ja) * | 2012-06-15 | 2012-10-11 | Toshiba Corp | 画像符号化装置及び画像符号化方法並びに画像復号化装置及び画像復号化方法 |
JP2020526942A (ja) * | 2017-06-29 | 2020-08-31 | ドルビー ラボラトリーズ ライセンシング コーポレイション | 統合された画像再構成及び映像符号化 |
JP7164535B2 (ja) | 2017-06-29 | 2022-11-01 | ドルビー ラボラトリーズ ライセンシング コーポレイション | 統合された画像再構成及び映像符号化 |
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Also Published As
Publication number | Publication date |
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CA2739304A1 (en) | 2010-04-08 |
CN104135665A (zh) | 2014-11-05 |
JP2010087984A (ja) | 2010-04-15 |
BRPI0920532A2 (pt) | 2015-12-29 |
CN104135665B (zh) | 2018-03-27 |
MX2011003499A (es) | 2011-06-16 |
KR20110074957A (ko) | 2011-07-05 |
US20110249738A1 (en) | 2011-10-13 |
JP5697301B2 (ja) | 2015-04-08 |
CN102172029A (zh) | 2011-08-31 |
TW201036449A (en) | 2010-10-01 |
EP2337357A4 (en) | 2013-05-15 |
EP2337357A1 (en) | 2011-06-22 |
AU2009299222A1 (en) | 2010-04-08 |
US8879627B2 (en) | 2014-11-04 |
RU2011117204A (ru) | 2012-11-10 |
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