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WO1999000985A1 - Procedes de codage et de decodage d'images - Google Patents

Procedes de codage et de decodage d'images Download PDF

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Publication number
WO1999000985A1
WO1999000985A1 PCT/JP1998/002835 JP9802835W WO9900985A1 WO 1999000985 A1 WO1999000985 A1 WO 1999000985A1 JP 9802835 W JP9802835 W JP 9802835W WO 9900985 A1 WO9900985 A1 WO 9900985A1
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WO
WIPO (PCT)
Prior art keywords
image
signal
decoding
units
field
Prior art date
Application number
PCT/JP1998/002835
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English (en)
Japanese (ja)
Inventor
Shinya Kadono
Original Assignee
Matsushita Electric Industrial Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co., Ltd. filed Critical Matsushita Electric Industrial Co., Ltd.
Publication of WO1999000985A1 publication Critical patent/WO1999000985A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/112—Selection of coding mode or of prediction mode according to a given display mode, e.g. for interlaced or progressive display mode
    • 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 up-sampling of the image signal DG obtained by the down-sampling is performed, and the up-sampled image signal corresponding to the 1-frame screen having the same resolution as the image signal G 0 corresponding to the 1-frame screen before the down-sampling is performed.
  • the UG is generated, both the image signal UG and the image signals UG 1 and UG 2 corresponding to each field obtained from the image signal UG are displayed on both the field screens FI 1 and FI 2 before down-sampling. It contains information on the image signals G1 and G2.
  • FIG. 22 shows a display image obtained from a down-sampled signal obtained by down-sampling the interlaced image signal in units of one field.
  • the figure shows the arc image as a one-frame image based on the down-sampled signal corresponding to the moving arc image.
  • FIGS. 22 (b) and 22 (c) show the respective images.
  • the arc image is displayed as an image of each field constituting one frame based on the downsampled signal.
  • the figure shows the case where the pixel values of four adjacent pixels are replaced with the pixel values of one pixel, but in actuality, the pixel values of many adjacent pixels and many pixels are averaged, for example, the pixel value of one pixel Is performed.
  • the image signals DG 1 and DG 2 obtained by the down-sampling the information in the image signals 0 1 and G 2 of the first and second field screens FI 1 and? Become. Therefore, the image signals DG 1 and DG 2 obtained by the down-sampling are up-sampled to obtain the image signals of the first and second field screens FI 1 and FI 2 before the down-sampling.
  • the block image signal is down-sampled in field units and the down-sampled signal is
  • the blocked image signal is down-sampled on a frame-by-frame basis and the down-sampled signal is encoded on a frame-by-frame basis to encode an image.
  • a coded signal is generated, and the image coded signal and a model indicating whether the downsample is performed in a frame unit or a field unit. And outputs a mode-coded signal obtained by coding a mode signal.
  • the motion vector coded signal in the image coding method according to claim 5 is decoded to generate a decoded motion vector signal
  • the decoded image signal is upsampled in field units or frame units and output to generate an image decoded signal.
  • upsampling processing suitable for each is performed, so that the image quality is not degraded for both the still image and the moving image without deteriorating the image quality.
  • the decoding process involving the amplifier samples of the encoded signal can be performed, and the downsampling process is switched based on the motion vector. It is possible to save the coded bits of the signal indicating the example.
  • the present invention (claim 7) is an image coding apparatus for coding an image signal, comprising: field down-sampler for down-sampling the image signal in field units; Frame down-sampling means for down-sampling in units; and determining, based on the image signal, whether to down-sample the image signal in units of fields or in units of frames.
  • Determination means for outputting a mode signal; a selection switch for selecting and outputting one of the output of the field downsampling means and the output of the frame downsampling means in accordance with the mode signal; and the selection switch.
  • the output signal of the switch is divided into blocks to correspond to each display block of a predetermined size that divides the display screen.
  • the image encoding apparatus includes: a field downsampler that downsamples an input image signal in units of fields; and a frame downsampler that downsamples the input image signal in units of frames.
  • Input image Since the output of one of the two down-sampling means is coded based on the determination result of whether the down-sampling process on the signal should be performed on a field basis or on a frame basis, the motion of a still image can be improved. Downsampling processing suitable for each video signal is also performed for a certain moving picture, and for both still pictures and moving pictures, image quality degradation due to encoding processing involving downsampling is prevented. Can be.
  • the present invention provides the image decoding method according to claim 1, wherein the encoded image encoded signal and the mode encoded signal are decoded.
  • a decoding device for decoding the image-encoded signal for each display block to generate an image-encoded signal; and a decoding module for decoding the mode-encoded signal to decode the image-encoded signal.
  • the present invention (claim 9) is an image coding apparatus for coding a block image signal obtained by blocking an image signal so as to correspond to each display block of a predetermined size that divides a display screen.
  • a determination unit that determines whether the block image signal should be encoded in a field unit or a frame unit, and outputs a mode signal corresponding to the determination result;
  • a field down-sampler for down-sampling in units of unit, a field encoder for coding the output of the field-based down-sampler in units of field, and a frame down-sampler for down-sampling the block image signal in frame units
  • a pull unit and a frame for encoding the output of the frame unit down sampling unit in frame units.
  • a mode encoding means for outputting a down-sampled encoded signal from the selection switch and a mode encoded signal from the mode encoding means.
  • the present invention is an image decoding apparatus for decoding an encoded image coded signal and a mode coded signal in the image coding method according to Claim 3.
  • a mode decoding means for decoding the mode coded signal and outputting a decoded mode signal, and a mode decoding means for decoding the image coded signal in field units.
  • Frame up-sampling means for up-sampling the output of the means in frame units; and a selection switch for selecting and outputting one of the outputs of the up-sampling means in accordance with the decoding mode signal.
  • Field-up sampling means for up-sampling the output in field units
  • frame up-sampling means for up-sampling the output of the above-mentioned decoding means in frame units
  • a selection switch for selecting and outputting one output of the sample means, and outputting the output of the selection switch as a decoded image signal.
  • the image decoding method further includes: a motion vector decoding unit that decodes a motion vector encoded signal in the image encoding method according to claim 5.
  • the decoded image signal is upsampled in field units or frame units and output to generate a decoded image signal.
  • upsampling processing suitable for each of them is performed, thereby enabling image encoding without deteriorating image quality for both still images and moving images.
  • decoding processing involving up-sampling of a signal can be performed, and switching of down-sampling processing is performed based on a motion vector, encoding bits of a signal indicating switching of down-sampling processing can be saved. be able to.
  • the mode-encoded signal in the image encoding method according to claim 1 is converted to i-th order, and the down-sampling processing in the image encoding method is performed.
  • the block image signal when the input image signal is encoded with the block image signal divided for each display block of a predetermined size for dividing the display screen, the block image signal is divided into fields or A process of determining in which frame unit coding should be performed, and, in accordance with the determination result, down-sampling the blocked image signal in field units or frame units, and field the down-sampled signal.
  • a program for causing a computer to perform a process of generating an image-encoded signal by encoding in units or frames is stored. By loading the program into the computer, any of a still image and a moving image is stored. Encoding processing that can prevent image degradation due to downsampling It can be realized by a computer.
  • the mode-encoded signal in the image encoding method according to claim 3 is decoded, and the down-sample processing in the image encoding method is performed in field units and frame units.
  • the signal is decoded in units of finale or frame, and upsampled in units of fields or frames to generate a decoded image signal.
  • the above program Since the program to be executed by the computer is stored, the above program is loaded into the computer, so that when decoding the image coded signal corresponding to the still image and the moving image, the appropriate up-sampling is performed. The processing is performed, whereby the decoding processing involving the amplifier samples of the image-encoded signal can be realized by the computer without deteriorating the image quality of both the still image and the moving image.
  • an input image signal is subjected to motion compensation coding processing on a block image signal divided for each display block of a predetermined size which divides a display screen, and an image is formed.
  • the block image signal is downsampled in field units or frame units according to the size of the motion vector obtained from the image signal, and the block image signal is motion compensated. Since a program for causing a computer to perform the encoding process is stored, by loading the program into the computer, it is possible to prevent the deterioration of image quality due to the down-sampling process for both still images and moving images. Encoding that can switch the down-sampling process Management it is possible to achieve by Konbyu Ichita.
  • the present invention (claim 18) is a data storage medium storing a program for performing the image decoding method according to claim 6 by a computer. Decodes an image coded signal and decodes the image. A process of generating an encoded signal and decoding the motion vector coded signal to generate a decoded motion vector signal; and, when the magnitude of the decoded motion vector is equal to or greater than a predetermined value, A process of up-sampling the decoded image signal in field units and outputting it, while upsampling the decoded image signal in frame units and outputting it when the size of the decoded motion vector is smaller than a predetermined value. It is what is done.
  • FIG. 2 is a flowchart showing the operation of the image encoding device according to the first embodiment.
  • FIG. 4 is a flowchart showing the operation of the image decoding apparatus according to the second embodiment.
  • FIG. 5 is a block diagram for explaining a configuration of an image encoding device according to Embodiment 3 of the present invention.
  • FIG. 20 shows an image signal in which an interlaced image signal corresponding to a still image and a moving image is obtained as one frame image and one frame image.
  • FIG. 9 is a diagram showing images of respective frames constituting a program.
  • the image encoding device 110a receives the input image signal S1n, and determines whether to perform the downsampling on a field basis or on a frame basis based on the input image signal Sin, A frame field determination circuit 1 that outputs a mode signal S m corresponding to the determination result, and a mode encoding circuit 2 that encodes the mode signal S m and outputs a mode encoded signal S mc, Further, it has a field unit and frame unit downsampler 1] a, 12a having the same configuration as that of the conventional image coding devices 210a, 220a.
  • FIG. 2 is a flowchart illustrating an encoding process performed by the image encoding device 110a.
  • down-sampling processing is performed on the input image signal S in. That is, as a result of the above determination processing, if downsampling processing in frame units should be performed, the input selection switch 3 is set to the mode signal S m so that the input image signal Sin is supplied to the frame unit downsampler 11a. The input image signal S 1 n is down-sampled in frame units by the down-sampler 11 a (step S 3). On the other hand, as a result of the above determination process, when down sampling processing in the field unit should be performed, the input selection switch 3 is set so that the input image signal S in is supplied to the field unit down sampling unit 12 a.
  • the downsampler 12a downsamples the input image signal S1n in field units (step S4). Further, the mode signal, that is, an identification signal indicating in which unit of the frame or the field the down-sampling has been performed is coded and output as a mode coded signal Smc (step S5).
  • FIG. 3 is a diagram for explaining an image decoding apparatus according to Embodiment 2 of the present invention.
  • the same reference numerals as those in FIG. 18 denote the same components as those of the conventional image decoding device 210 b, and 110 Ob denotes the image coding device 1 of the first embodiment shown in FIG.
  • Decoding process with up-sampling for image coded signal Sc from 10a Is an image decoding device that performs the following.
  • the image decoding device 110b decodes the mode coded signal S me and decodes the down coded signal in a frame unit or a down unit in a field unit in the coding process. It has a mode decoder 6 for outputting the signal S me and an image decoding circuit 4 for decoding the image coded signal, and decodes by integrating the decoded image signal in block units which is the output S e. It has a deblocking circuit 50 that composes an image, and upsamplers 61b and 62b for each field and each frame.
  • the image decoding circuit 40, the inverse processing circuit 50, and the upsamplers 61b and 62b have the same configuration as those of the conventional image decoding devices 210b and 220b2. .
  • the mode coded signal Smc and the coded image signal Sc are input to the image decoding device 110b, the mode coded signal Smc is decoded by the mode coding circuit 6. Then, a decoding mode signal Sme indicating whether the down-sampling processing in the image coding processing is down-sampling processing in fields or down-sampling in frames is output (step S10).
  • the image coded signal Sc is decoded by the image coding circuit 40 in units of blocks (step S11), and is divided into blocks by the inverse blocking circuit 50. The decoded image signals are integrated (step S12). Subsequently, up-sampling processing for the decoded image signal Sc is determined according to the decoding mode signal S me (step S 13).
  • the up-sampling is performed on a field-by-field basis, and the image quality deteriorates in the time direction, that is, the ring of the moving image Prevent blurred or of the moving state is unnatural be able to.
  • the image encoding device 120a includes a field unit downsampler 31a for downsampling the blocked image signal Sb in a field unit, and a downsampled output Sd1 in the field.
  • a field unit encoder 34 that encodes in units, a frame downsampler 32 a that downsamples the blocked image signal Sb in frame units, and a downsampled output Sd2 in frame.
  • a frame unit encoder 35 for encoding in units.
  • the dual image encoding apparatus 120a according to Embodiment 3 having such a configuration has the following effects.
  • the mode signal for switching between the field unit and the frame unit can be shared for each process, and the mode signal is used for the encoding process and the down sampling process. And save overhead information for separate encoding.
  • the input selection switch 7 b connects the input of the field unit decoder 72 to the output selection switch 8 b Selects the output of the field unit upsampler 6 lb, and if the decoding mode signal S mae indicates down sampling and encoding in frame units, the input selection switch 7 b
  • the input of the frame unit decoder 73 is used as an input, and the output selection switch 8 b is used as a frame unit amplifier.
  • the output of the sampler 62b is selected, and the decoded image signal Su is output as a selected output from the output selection switch 8b.
  • the mode coded signal S mac and the image coded signal Sc are input to the image decoding device 120b, the mode coded signal S mac is decoded by the mode decoding circuit 6b. Then, a decoding mode signal Smae indicating whether the downsampling and the encoding process are performed in the field unit or the frame unit is output (step S30). Then, in accordance with the decoding mode signal S mae, the input selection switch 7 selects one of the inputs of the field unit decoder 72 and the frame unit decoder 73, and the output selection switch 8 One of the outputs of the field unit upsampler 61b and the frame unit upsampler 62b is selected (step S30a).
  • step 3 the data is decrypted in frame units (step S33), and the output Se22 is output in the frame unit upsampler 62b to be upsampled in frame units (step 34). Then, the output of any one of the up-samplers is output as a decoded image signal Su via the output selection switch 8b.
  • the image decoding apparatus 120b decodes the mode coded signal S mac, and performs down-sampling and coding processing for the image coded signal S c on a field-by-field basis.
  • the decoding mode that indicates which unit A mode decoding circuit 6b for outputting a decoded signal S mae, and performs decoding and up-sampling processing on the coded block image signal S mac according to the decoding mode signal S mae in units of fields or frames. Since the encoding is performed in units, the image coded signal corresponding to the still image is correctly decoded without preventing the spatial resolution in the vertical direction by decoding and upsampling in units of frames. An image coded signal corresponding to a moving image is correctly decoded by field-based decoding and assampling without preventing deterioration in image quality in the time direction.
  • FIG. 9 is a block diagram for explaining an image coding apparatus according to Embodiment 5 of the present invention.
  • reference numeral 130a denotes an image coding apparatus according to the fifth embodiment which performs an encoding process with down-sampling on a blocked input image signal (blocked image signal) Sb. .
  • the image encoding apparatus 130a encodes a motion vector Smv indicating a motion of an object on a display processor of a predetermined size that divides a display screen, and generates a motion vector coded signal Cm.
  • a motion vector encoding circuit 9 that outputs V and a motion vector S mv corresponding to each block are input, and the input image signal S b corresponding to each block is downsampled in frame units.
  • a mode determination circuit 8 for determining whether the down sampling should be performed in units of blocks or in units of fields, and outputting a mode signal S mm corresponding to the determination result.
  • the mode determination circuit 8 compares the magnitude of the motion vector S mv with a predetermined value, and if the magnitude of the motion vector is equal to or greater than the predetermined value, the mode is determined in units of fields.
  • a mode signal S mm indicating that sampling should be performed is output. If the size of the motion vector is smaller than a predetermined value, a mode signal S mm indicating that down sampling should be performed in frame units is output.
  • the motion vector corresponding to each of the above blockings may have been detected in advance by the motion vector detecting means outside the present image encoding device.
  • the present image encoding device 130a converts the above-mentioned blocked image signal Sb into a field. It has a field unit downsampler 31a for downsampling in block units and a frame unit downsampler 32a for downsampling the block image signal Sb in frame units.
  • an input selection switch 3c is provided upstream of the downsamplers 31a and 32a, and an output selection switch 4c is provided downstream of the downsamplers.
  • the input selection switch 3c supplies the blocked image signal Sb to one of the downsamplers in accordance with the mode signal Sinm, and the output selection switch 4c c is such that one of the outputs S c1 and S c2 of the both down-samplers is selected according to the mode signal S mm and output as an image coded signal S cc.
  • the output of the output selection switch 4c is input to the image encoding circuit 30a, and the motion vector is output to the image encoding circuit 30a.
  • the motion compensation encoding process with reference to Smv is performed and output as an encoded image signal Sc.
  • FIG. 10 is a flowchart showing the encoding process performed by the image encoding device 130a.
  • a downsample process is performed on the blocked image signal Sb. That is, when the value of the motion vector is larger than the predetermined value, the input selection switch 3c is set on the basis of the mode signal Smm so that the blocked image signal Sb is supplied to the field unit downsampler 31a.
  • the down-sampler 31a down-samples the blocked image signal Sb in field units (step S22).
  • the input selection switch 33 is used so that the above-mentioned blocked image signal Sb is supplied to the frame unit downsampler 32a. a is switched based on the mode signal Smm, and the block image signal Sb is down-sampled in frame units by the downsampler 32a (step S24).
  • the output selection switch 4c selects and selects one of the outputs Sc1, Sc2 of the down-samplers 31a and 32a in accordance with the mode signal Smm.
  • the down-sampled signal is output to the image encoding circuit 30a, and the down-sampled signal is subjected to an encoding process with reference to a motion vector on a block basis in the circuit 30a (Step S). 43) is output as an image coded signal Sc.
  • the image coding apparatus 130a as in the first and third embodiments, whether the down-sampling processing is performed in a field unit or a frame unit based on an input image signal is determined. Instead of determining the size of the motion vector, it estimates whether the image is a still image or a moving image based on the size of the motion vector, and switches between a downsample in units of finolade and a downsample in units of frames. Therefore, as described in the first and third embodiments, the still image signal is down-sampled in frame units, and the moving image signal is down-sampled in field units.
  • the downsampling based on the size of the motion vector By switching on a sample basis, the number of coding bits required for the mode signal can be reduced, and further, the image quality substantially equal to that of the first and third embodiments can be obtained.
  • the fifth embodiment it is determined on a block-by-block basis whether the down-sampling process of the blocked image signal Sb is performed in a field unit or a frame unit.
  • the unit is switched between the down sampling process and the down sampling process.However, the switching of the down sampling process does not necessarily have to be determined and performed in units of blocks.For example, the switching of the down sampling process is determined in units of several blocks. You can do it.
  • FIG. 11 is a block diagram for explaining an image decoding apparatus according to Embodiment 6 of the present invention.
  • 13 Ob is the present embodiment that applies a decoding process with up-sampling to a block image signal Sc encoded by the image encoding device 130a of the fifth embodiment.
  • 20 is an image decoding device according to a sixth aspect.
  • the image decoding apparatus 13 0 b includes a motion vector decoder 10 that decodes the motion vector coded signal C mV and outputs a decoded motion vector E m V.
  • An image decoding circuit 40 that decodes the image coded signal Sc and outputs the image decoded signal Se with reference to the vector E m V, and a decoding motion vector E corresponding to each block. With m V as input, it is determined on a block-by-block basis whether the image coded signal Sc corresponding to each block should be sampled in frames or assembled in fields, and the mode according to the judgment result
  • the signal Sme has a mode determination circuit 11.
  • the mode determination circuit 11 compares the magnitude of the decoding motion vector EmV with a predetermined value, and if the size of the decoding motion vector is equal to or more than the predetermined value, the file A mode signal Sme indicating that upsampling should be performed in units of code is output, and if the magnitude of the decoding motion vector EmV is less than a predetermined value, it indicates that upsampling should be performed in units of frames.
  • the mode signal S me is output.
  • the mode signal S me is the same as that in the image encoding device 130a of the fifth embodiment shown in FIG. Down sample processing If this is done, the up-sampling process in the field unit is also performed in the image decoding device 130b in FIG. 11 and the down-sampling process in the frame unit in the image coding device 130a in FIG. Is performed, the up-sampling process is also performed for each frame in the image decoding apparatus 130b of FIG.
  • the output Se of the image decoding circuit 40 is provided before the two upsamplers 6lb and 62b in the decoding motion vector.
  • An input selection switch 7c is provided to supply one of the two up-samplers based on the current Em V, and the outputs S u1, S of the two up-samplers are provided based on the decoding motion vector Em V.
  • An output selection switch 8c for selecting and outputting one of u2 is provided.
  • the switches 7 c and 8 c select the input and output of the field unit upsampler 6 lb when the decoding motion vector Em V indicates downsampling in the field unit.
  • the input and output of the upsampler 62b in frame unit are selected.
  • FIG. 12 is a flowchart illustrating an image decoding process performed by the image decoding apparatus 130b according to the sixth embodiment.
  • the motion vector decoding circuit 10 performs the motion vector decoding.
  • the toll coded signal CmV is decoded, and a decoded motion vector EmV is generated (step S50).
  • the image decoding circuit 40 the decoded image signal S e is output in a block unit with reference to the image coded signal S c power decoding operation vector Em V and a decoded image signal Se is output (step S 51).
  • the mode determining circuit 11 determines the magnitude of the motion of the image of each block from the decoded motion vector Em V (step S41), and determines whether the magnitude of the motion is larger than a predetermined value. They are compared (step S42).
  • the input selection is performed so that the output S e of the image decoding circuit is supplied to the field unit upsampler 6 1 b.
  • the switch 7c is switched based on the decoding motion vector Emv, and the image decoding output Se is up-sampled in field units by the upsampler 61b (step S32).
  • the input selection switch 7c is used to set the decoding motion vector so that the output Se of the image decoding circuit is supplied to the frame unit upsampler 62b.
  • the image decoding output Se is up-sampled in frame units by the up-sampler 62b (step S34).
  • the configuration of the image coding device or the image decoding device described in each of the above embodiments is described.
  • the processing described in each of the above embodiments can be easily performed by an independent computer system. It can be implemented.
  • FIG. 13 shows a case where the image encoding process or the image decoding process of the first to sixth embodiments is performed by a computer system using a floppy disk storing the encoding or decoding program.
  • Fig. 13 (b) shows the external appearance, cross-sectional structure, and floppy disk of the floppy disk as viewed from the front
  • Fig. 13 (a) shows the physical format of the floppy disk, which is the main body of the recording medium.
  • the floppy disk FD is built in the case F.
  • On the surface of the disk a plurality of tracks Tr are formed concentrically from the outer circumference toward the inner circumference, and each track has 16 sectors in the angular direction. It is divided into S e. Therefore, in the floppy disk storing the program, data as the program is recorded in an area allocated on the floppy disk FD.
  • the image encoding method, the image decoding method, and the image encoding apparatus perform the compression or decompression processing of the interlaced image signal with high coding efficiency while suppressing the image deterioration of both still images and moving images. This is extremely useful as a means of realizing image coding and image decoding in a system for transmitting and storing image signals. Suitable for decompression processing.

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Abstract

L'invention porte: sur des procédés de codage et de décodage d'images (voir la figure) comportant un circuit (1) de décision trame/champ décidant si l'échantillonnage des signaux d'entrée d'image (Sin) s'effectue pour chacune des trames ou pour chacun des champs, et émettant un signal de mode (Sm) en fonction du résultat de la décision; sur un dispositif (11a) qui prélève des d'échantillons du signal d'entrée d'image (Sin) pour chaque trame; et sur un dispositif (11a) qui prélève des d'échantillons du signal d'entrée d'image (Sin) pour chaque champ, et sélectionne le signal de sortie de l'un ou l'autre (11a) et (12a) des dispositifs de prélèvement en fonction du signal de mode (Sm) pour assurer le groupage et le codage de l'image. On peut donc après codage des signaux entrelacés d'image sélectionner l'échantillonnage adéquat des signaux en fonction du type d'image, fixe ou animée, de manière à éviter les détériorations de l'image dues au codage accompagné par l'échantillonnage.
PCT/JP1998/002835 1997-06-27 1998-06-25 Procedes de codage et de decodage d'images WO1999000985A1 (fr)

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JP9/171973 1997-06-27
JP17197397A JPH1118092A (ja) 1997-06-27 1997-06-27 画像符号化方法および画像復号化方法

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WO1999000985A1 true WO1999000985A1 (fr) 1999-01-07

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