JP4417031B2 - Video playback device and video playback system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a moving image playback apparatus, and more particularly, to a moving image playback apparatus that decodes a moving image data stream of a moving image-compatible JPEG 2000 file and reproduces a moving image.
[0002]
[Prior art]
First, among the features of the still image international standard JPEG2000 system used in this type of moving image playback apparatus, a portion related to the present invention will be briefly described. The details of the JPEG2000 system can be referred to according to the JPEG2000 recommendation (ISO / IEC) or the next-generation image encoding system JPEG2000 (Japanese: issued by Trikes).
[0003]
One of the features of the JPEG2000 system is that the original image is biased in terms of color space frequency using a method called wavelet transform before compression encoding in order to further increase the data compression efficiency during image compression. It is in. Further, by repeating the wavelet transform, image data from low resolution to high resolution is configured in order of each resolution level.
[0004]
FIG. 7 is an explanatory diagram for explaining the wavelet transform, and shows an image in which each resolution level is created as a result of repeating the wavelet transform.
[0005]
As shown in FIG. 7, the original image A having the resolution level (0) is converted into four components LL (1) corresponding to the low frequency component L and the high frequency component H in the vertical and horizontal directions of the image by the wavelet transform (1). , HL (1), LH (1), HH (1), and the image shown in the image AW1 is obtained. The image resolution of each of the four components of the image AW1 is ½ in both the vertical and horizontal directions of the original image A. This is called the resolution level (1). In addition, the image portion of the component LL (1) in which the lowest frequency component in the color space frequency is biased is subjected to wavelet transform (2), and an image shown in the image AW2 is obtained. The four components LL (2) , HL (2), LH (2), and HH (2), and further, wavelet transform (3) is performed on the image portion of the component LL (2) in the image shown in the image AW3. is there.
[0006]
In this way, among the four components created by one wavelet transform, only the component LL with the lowest frequency component biased is recursively wavelet transformed, so that a plurality of subordinates from a high resolution to a low resolution can be obtained. A resolution level is created.
[0007]
The order of encoding is generally performed in order from the lowest resolution to the highest resolution, and the encoding unit of one code string includes components LL, HL, LH, and HH of each resolution level. Further, it becomes a minimum coding unit divided into units called code blocks CB, and compression is performed using an entropy coding method called predictive arithmetic coding.
[0008]
FIG. 8 is an explanatory diagram for explaining the code block CB which is the minimum coding unit of the code string, and shows an image of the code block CB.
[0009]
In the JPEG2000 system, as shown in FIG. 8, each code is not assigned to each pixel unit, but first, an image of a code block CB unit is divided into units called bit planes sliced bit by bit in the color resolution direction. Furthermore, a code is assigned to each bit constituting the bit plane. The minimum coding unit as a code string is basically a code block unit, but may be a unit obtained by further dividing a bit plane by the concept of a path.
[0010]
Further, the JPEG2000 system has a feature that the coding order is performed from the upper bit plane toward the lower bit plane. Similarly, the decoding order is also performed from the upper bit plane toward the lower bit plane. Even when decoding is interrupted in the middle, decoding is performed by regarding the value of the subsequent bit planes as 0. It has a feature that it can be displayed as an image having color direction resolution up to the finished bit plane.
[0011]
A moving image data stream of a JPEG 2000 file corresponding to a moving image, which is composed of a plurality of compressed image data streams compressed and encoded by the above-described JPEG 2000 method, is decoded frame by frame by a moving image reproducing device, and a moving image is reproduced.
[0012]
This moving image playback apparatus includes a JPEG2000 decoding unit and an image display unit, continuously decodes a compressed image data stream of a plurality of frames of a moving image data stream in units of frames, and simply displays a still image of a plurality of frames continuously. To play the video.
[0013]
FIG. 9 is an explanatory diagram for explaining the moving image reproduction by the moving image reproducing device. The compressed image data stream of a plurality of frames has a screen resolution in the XY direction corresponding to the still images I1 to I6 of the plurality of frames. The direction resolution is displayed as an image in the Z direction.
[0014]
[Problems to be solved by the invention]
As described above, the conventional video playback device using the JPEG2000 system decodes the compressed image data stream of each frame constituting the video data stream of the video JPEG2000 file for video, and simply plays back each still image continuously. This is a method of obtaining a moving image, and it is assumed that a moving image-compatible JPEG2000 file is created according to the reproduction environment such as required resolution and frame rate, and is different from the original moving image-compatible JPEG2000 file. It was impossible to specify the resolution, frame rate, etc. during playback.
[0015]
That is, in the conventional video playback device, if the playback environment is different, it is necessary to prepare video data individually for each environment, and a decoding processing capability of a certain level or higher is required to maintain and play back the video according to the playback environment. It is. In a video playback device that has only a decoding processing capability below a certain level, there is a problem that video playback fails because video playback of each frame cannot catch up.
[0016]
Note that the “failure” mentioned here may have various patterns depending on the error processing of each moving picture reproducing apparatus. For example, when the video playback process cannot catch up, an error display etc. may be displayed on the screen and the video playback itself may be interrupted, and the screen up to the point where the decoding process has been completed is displayed. A pattern in which video playback cannot be continued or interrupted is conceivable. Furthermore, a pattern in which the video playback device itself hangs up is conceivable, which means that stable video playback cannot be continued anyway.
[0017]
Basically, if the playback environment of the video-compatible JPEG2000 file and the video playback device are different, after all the information of the video-compatible JPEG2000 file is played back once, the screen is reduced (resolution change), frame thinning (frame rate) Change), color reduction (changing the resolution in the color direction), etc., it is necessary to prepare a separate conversion device, which is very inefficient and consumes wasted power. .
[0018]
Conventionally, a CPU, a DSP or the like having a necessary capability adapted to the reproduction environment is mostly used alone, and there has been no shortage of the decoding processing capability. There are many systems that execute a plurality of functions including a single CPU and DSP to reduce the size and reduce power consumption, and processing other than decoding processing becomes large, and decoding processing capability may be insufficient. In addition, due to the diversification of systems, it has become more frequent that an optimal video data stream is not prepared for each system. For this reason, such a problem is increasing.
[0019]
As a countermeasure for this, for example, Patent Document 1 discloses an image decoding apparatus that performs decoding after that when decoding of a compressed image data stream is not completed within a specified time by switching to simplified processing. FIG. 10 is a block diagram showing this conventional image decoding apparatus. However, this image decoding apparatus needs to include a dedicated JPEG2000 decoding unit 26 and a simplified unit 27 dedicated to JPEG2000 compatible decoding processing and simplification processing, and a commercially available or standard JPEG2000 decoder cannot be used. Newly occurs. Further, when the simplification-compatible JPEG2000 decoding unit 26 is configured as one of a plurality of software function units that are executed in parallel by a general-purpose CPU and a program, the resolution or display color may be changed during reproduction depending on the decoding processing status. There is a problem that the screen changes from the user's point of view.
[0020]
Accordingly, an object of the present invention is to decode a moving image data stream of a moving image-compatible JPEG 2000 file and reproduce a moving image under a reproduction environment condition different from that of the moving image-compatible JPEG 2000 file.
[0021]
[Patent Document 1]
JP 2002-325257 A (FIG. 2, FIG. 3, claim 1)
[0022]
[Means for Solving the Problems]
Therefore, the present invention provides a JPEG2000 decoding unit that decodes a compressed image data stream of a plurality of frames, each compressed and encoded as a moving image data stream of a moving image-compatible JPEG2000 file, and reproduces a moving image by displaying an image in units of frames. In a video playback device comprising an image display unit
A frame extraction unit for extracting related information of a video data stream from the video JPEG2000 file and extracting a compressed image data stream of a playback frame from the video data stream;
A stream termination unit that inputs a compressed image data stream of the playback frame, adds a termination code at a position corresponding to a termination control signal, and outputs the termination code to the JPEG2000 decoding unit;
Based on the externally set playback environment condition and the related information, the end position of the compressed image data stream of the playback frame is calculated and based on the calculation result Every frame unit And a reproduction control unit that generates the termination control signal.
In addition, the present invention provides a JPEG2000 decoding unit that decodes a compressed image data stream of a plurality of frames, each of which is compression-encoded as a moving image data stream of a JPEG2000 file for moving images, and reproduces a moving image by displaying an image in units of frames. In a video playback device comprising an image display unit
Extract related information of a video data stream from the video JPEG2000 file, and input or skip the video data stream as appropriate for each frame based on an input control signal to extract a compressed image data stream of a playback frame from the video data stream A frame extractor;
A stream termination unit that inputs a compressed image data stream of the playback frame, adds a termination code at a position corresponding to a termination control signal, and outputs the termination code to the JPEG2000 decoding unit;
Based on the externally set playback environment conditions and the related information, the input position and end position of the compressed image data stream of the playback frame are calculated, and based on the calculation result Every frame unit A reproduction control unit that generates the input control signal and the termination control signal.
[0023]
Further, the JPEG2000 decoding unit is one of a plurality of software function means implemented in parallel by a general-purpose CPU and a program, and outputs current decoding capability information,
The reproduction control unit calculates an input position and a termination position of the compressed image data stream of the reproduction frame based on the decoding capability information, and generates the input control signal and the termination control signal based on the calculation result.
[0024]
Also, the moving image playback system of the present invention receives a compressed image data stream of a plurality of frames, each compressed and encoded as a moving image data stream of a JPEG 2000 file for moving images, decodes it in units of frames, displays an image in units of frames, and displays moving images. A stream receiving station to play,
Corresponding to the playback environment condition of the stream receiving station, a stream transmitting station that extracts the compressed image data stream of the playback frame from the moving picture data stream of the moving picture-compatible JPEG 2000 file, adjusts the termination, and transmits the stream to the stream receiving station is provided. Yes.
[0025]
In addition, the stream transmitting station extracts related information of the moving image data stream from the moving image compatible JPEG2000 file, and appropriately inputs or skips the moving image data stream in units of frames based on an input control signal, thereby reproducing a reproduction frame from the moving image data stream. A frame extraction unit for extracting the compressed image data stream of
A stream termination unit that inputs a compressed image data stream of the playback frame, adds a termination code at a position corresponding to a termination control signal, and transmits the stream to the stream receiving station; and based on the playback environment condition and the related information, And a playback control unit that calculates an input position and a termination position of the compressed image data stream and generates the input control signal and the termination control signal based on the calculation result.
[0026]
In addition, as one of a plurality of software function means executed in parallel by a general-purpose CPU and a program, the stream receiving station decodes the plurality of frames of compressed image data streams and outputs the current decoding capability information. A decoding unit,
The reproduction control unit calculates an input position and a termination position of the compressed image data stream of the reproduction frame based on the decoding capability information, and generates the input control signal and the termination control signal based on the calculation result.
[0027]
A plurality of the stream receiving stations are provided.
[0028]
Further, the reproduction environment condition includes a resolution and a frame rate of the reproduction moving image.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing Embodiment 1 of the moving image playback apparatus of the present invention. Referring to FIG. 1, the moving image playback apparatus of the present embodiment includes a frame extraction unit 11, a stream termination unit 12, a playback control unit 13, a JPEG2000 decoding unit 21, and an image display unit 22.
[0030]
The frame extraction unit 11 extracts the related information of the moving image data stream from the moving image-compatible JPEG 2000 file, and uses the compressed image data streams of a plurality of frames that are each compression-coded as the moving image data stream of the moving image-compatible JPEG 2000 file as input control signals. Based on this, the compressed image data stream of the playback frame is extracted from the moving image data stream by appropriately inputting or skipping in units of frames.
[0031]
The stream termination unit 12 receives the compressed image data stream of the playback frame from the frame extraction unit 11, adds a termination code at a position corresponding to the termination control signal, and outputs the result to the JPEG 2000 decoding unit 21.
[0032]
For example, as shown in FIG. 2, the reproduction control unit 13 is configured to include a calculation unit 131 and a signal generation unit 132, and the calculation unit 131 includes externally set reproduction environment conditions and the relationship input from the frame extraction unit 11. Based on the information, the input position and the end position of the compressed image data stream of the playback frame are calculated, and the signal generation unit 132 generates the input control signal and the end control signal at appropriate timing based on the calculation result of the calculation unit 131. The data is output to the frame extraction unit 11 and the stream end unit 12.
[0033]
The JPEG2000 decoding unit 21 is a decoder that supports the same still image international standard JPEG2000 as the conventional one. The compressed image data stream of a plurality of frames is input from the stream end unit 12 and decoded in units of frames, and the image data stream of the plurality of frames is converted into an image. Output to the display unit 22. Here, in the still image international standard JPEG2000, a plurality of code strings that constitute an image data portion of a compressed image data stream and are basically generated in units of code blocks are scanned in units of bytes, and “FFFF” is expressed in hexadecimal. That is, if there is a portion where “FF” continues twice, this is used as the terminal code of each code string based on the predicted arithmetic code data, and whether the code string continues or does not continue after this terminal code. In other words, the decoding process is not performed until the start point of the next code string.
[0034]
For example, if there is a code string "... A128C2C0E62784 ..." in hexadecimal, if you want to forcibly terminate decoding up to "... A128C2C0E", use "6278" that follows "... A128C2C0E". By replacing it with “FFFF” or by inserting “FFFF” after “... A128C2C0E” and then inputting it to the JPEG2000 decoder, this image data will be the data of the data terminated with “... A128C2C0E”. It is treated as a code string, and the decoding is completed up to the target decoding interruption position, and the subsequent decoding process is not performed.
[0035]
The image display unit 22 has the same function as the conventional one. The image display unit 22 receives a plurality of frames of image data streams from the JPEG2000 decoding unit 21 and continuously displays a plurality of frames of still images to reproduce a moving image.
[0036]
The moving image playback apparatus according to the present embodiment can play back a moving image by decoding the moving image data stream of the moving image-compatible JPEG 2000 file in a reproduction environment different from that of the moving image-compatible JPEG 2000 file. FIG. 3 is an explanatory diagram for explaining moving image reproduction by the moving image reproducing device of the present embodiment. Here, in each of the divided drawings (A) to (D), examples of moving image reproduction corresponding to the reproduction environment are shown, respectively, and similarly to FIG. 9, a plurality of frames are compressed corresponding to the plurality of still images I1 to I6. The image data stream is displayed as an image with the screen resolution in the XY direction and the color direction resolution in the Z direction, and the hatched part is a part that is deleted from the original image according to each playback environment during playback of the moving image. Indicates.
[0037]
For example, the moving image reproduction example shown in FIG. 3A is an example in which the display portion of the liquid crystal portion used in a small portable TV or the like is small, and the image resolution or image size may be, for example, 1/4 as a reproduction environment. Both the images are controlled by the reproduction control unit 13 and the stream end unit 12 so as to decode and reproduce up to the component LL (1) of the resolution level (1) which is one step lower in resolution than the original image. At this time, the required processing capacity of the decoder is about ¼ that of FULL decoding.
[0038]
The moving image reproduction example shown in FIG. 3B is an example in which the resolution in the color direction of the liquid crystal part used in a mobile phone or the like is low, and the resolution or gradation in the color direction may be, for example, 1/2 as a reproduction environment. Both still images are controlled by the reproduction control unit 13 and the stream termination unit 12 so that the decoding and reproduction of the bit plane group of each code block is terminated to 1/2. For example, the resolution or gradation in the color direction of the original image If each component is 8 bits, the upper 4 bits of each component are decoded and reproduced. At this time, the required processing capacity of the decoder is about ½ that of FULL decoding.
[0039]
In the moving image reproduction examples shown in FIGS. 3C and 3D, key frames to be FULL decoded at intervals of three still images based on the moving image reproduction examples in FIGS. 3A and 3B. In this example, playback control is performed. At this time, the required processing capacity of the decoder is about 1/2, 2/3 of the FULL decoding. However, in the case of FIG. 3A, the resolution is different between the key frame and the others, so it is necessary to separately enlarge the (1/4) image of the low resolution part other than the key frame by a factor of four.
[0040]
Also, although not shown as an example of moving image reproduction in FIG. 3, when the display speed is slow and the frame rate may be, for example, 1/2 with STN liquid crystal or the like, and it is desired to reduce the power consumption of the reproduction processing capacity accordingly, The reproduction control unit 13 and the frame extraction unit 11 are controlled so that one frame of input data is skipped for two still images and a reproduction frame is extracted, and each frame is decoded and reproduced at a half frame rate. At this time, the required processing capacity of the decoder is about ½ that of FULL decoding.
[0041]
As described above, the moving image playback apparatus according to the present embodiment adds the frame extraction unit 11, the stream end unit 12, and the playback control unit 13 to the preceding stage of a commercially available or standard JPEG2000 decoding unit, so that it can be used for playback purposes and purposes. Accordingly, the moving image data stream can be decoded and the moving image can be reproduced without editing the moving image corresponding JPEG 2000 file under a reproduction environment condition different from that of the moving image corresponding JPEG 2000 file. Even in a playback environment equipped with a decoder that has only a decoding processing capability below a certain level, although there is a trade-off item in the playback content, video playback continues without failure.
[0042]
FIG. 4 is a block diagram showing Embodiment 2 of the moving image playback apparatus of the present invention. Referring to FIG. 4, the moving image playback device of the present embodiment includes a frame extraction unit 11, a stream termination unit 12, a playback control unit 14, a JPEG2000 decoding unit 23, and an image display unit 22. 12 and the image display unit 22 are the same as the respective blocks in the moving image reproducing apparatus of the first embodiment shown in FIG.
[0043]
For example, as shown in FIG. 5, the playback control unit 14 is configured to include a calculation unit 141 and a signal generation unit 132, and the calculation unit 141 relates to externally set playback environment conditions and the relationship input from the frame extraction unit 11. Based on the information and the decoding capability information input from the JPEG2000 decoding unit 23, the input position and the end position of the compressed image data stream of the playback frame are calculated, and the signal generation unit 132 selects an appropriate value based on the calculation result of the calculation unit 131. An input control signal and a termination control signal are generated at timing and output to the frame extraction unit 11 and the stream termination unit 12.
[0044]
As shown in FIG. 4, the JPEG2000 decoding unit 23 is one of a plurality of software function units that are executed in parallel by a general-purpose CPU and a program. The JPEG2000 decoding unit 23 performs decoding processing compatible with the still image international standard JPEG2000 and A compressed image data stream of a plurality of frames, each compressed and encoded as a moving image data stream of a file, is input from the stream end unit 12 and decoded in units of frames, and the image data stream of a plurality of frames is output to the image display unit 22, Is output to the reproduction control unit 14.
[0045]
The video playback device of the present embodiment does not edit the video JPEG 2000 file in a playback environment different from the video JPEG 2000 file depending on the use and purpose at the time of playback, similar to the video playback device of the first embodiment of FIG. The video data stream can be decoded and the video can be played back, and the general-purpose CPU can execute processes other than JPEG2000 compatible decoding processing in parallel, so that even when the decoding processing capacity of the JPEG2000 decoding unit decreases, the decoding processing capacity decreases. Following this, the playback environment such as resolution and frame rate is adjusted in a timely manner, and although there is a trade-off item in the playback content, video playback is continued without failure.
[0046]
For example, when the current decoding processing capacity drops to 25%, if priority is given to the resolution, the playback frame rate may be controlled to ¼, and if priority is given to the resolution, the resolution will be vertical and horizontal. What is necessary is just to control so that it may become 1/2. In addition, it is possible to make fine adjustments by controlling the frame rate and resolution at the same time, and it is possible to select flicker prevention during playback.
[0047]
FIG. 6 is a block diagram showing an embodiment of the moving image playback system of the present invention. Referring to FIG. 6, the moving image reproduction system of the present embodiment includes a stream transmission station 1 and a stream reception station 2 that are respectively compressed and encoded as a moving image data stream of a moving image-compatible JPEG2000 file.
[0048]
The stream transmission station 1 includes a frame extraction unit 11, a stream termination unit 12, a reproduction control unit 13, and a communication interface 15 in the video reproduction device shown in FIG. The compressed image data stream of the playback frame is extracted from the moving picture data stream of the corresponding JPEG2000 file, and the termination is adjusted and transmitted to the stream receiving station 2.
[0049]
The stream receiving station 2 includes a JPEG2000 decoding unit 21, an image display unit 22, and a communication interface 25 in the moving picture reproducing apparatus shown in FIG. 1, receives a compressed image data stream of a plurality of frames from the stream transmitting station 1, and receives the frame unit. Decodes and displays an image frame by frame to play a moving image.
[0050]
As described above, the moving image reproducing system of this embodiment separates each block in the moving image reproducing apparatus shown in FIG. 1 into the stream transmitting station 1 and the stream receiving station 2 and transmits / receives a compressed image data stream of a plurality of frames. Basically, it operates in the same manner as the moving picture reproducing apparatus shown in FIG. 1 is an application example of the video playback device shown in FIG. 1 to a wireless system or a home server system, and the video can be played back by the stream receiving station 2 at a location away from the stream transmitting station 1 that stores the JPEG2000 file corresponding to the video. Have
[0051]
In the video playback system of the present embodiment, the case where there is a single stream receiving station has been described. However, the present invention is not limited to this description. In accordance with the conditions, a modified example in which a compressed image data stream of a reproduction frame is extracted from a moving image data stream of a moving image-compatible JPEG 2000 file, adjusted to be terminated, and transmitted to a plurality of stream receiving stations 2 is possible.
[0052]
In this modification, the compressed image data stream of the playback frame can be extracted and adjusted at a common stream transmission station instead of a plurality of stream reception stations, and the cost of the entire system can be kept low. In addition, transmission of adjusted compressed image data stream reduces communication traffic, shortens communication-related circuit operation time that consumes a relatively large amount of power, and reduces both stream transmission station and stream reception station consumption. Powered.
[0053]
Also in the video playback system of the present embodiment, as in the video playback device described with reference to FIG. 4, the JPEG2000 decoding unit of the stream receiving station includes a plurality of software function means implemented in parallel by a general-purpose CPU and a program. As one example, the compressed image data stream of a plurality of frames is decoded and the current decoding capability information is output, and the playback control unit of the frame transmitting station determines the input position and end of the compressed image data stream of the playback frame based on the decoding capability information A modification in which the position is calculated and the input control signal and the termination control signal are generated based on the calculation result is also possible.
[0054]
【The invention's effect】
As described above, the moving image playback apparatus of the present invention has a resolution, a frame rate, and the like that differ from those of a JPEG 2000 file corresponding to a moving image depending on the use and purpose at the time of playback by adding a frame extraction unit, a stream end unit, and a playback control unit. Under the playback environment conditions, the moving image data stream can be decoded and the moving image can be reproduced without editing the moving image compatible JPEG2000 file. Further, even in a playback environment equipped with a decoder that has only a decoding processing capability below a certain level, video playback continues without failure.
[0055]
In addition, a dedicated or commercially available JPEG2000 decoder can be used without requiring a dedicated JPEG2000 decoder for performing simplification processing, and the degree of freedom in device design is improved.
[Brief description of the drawings]
FIG. 1 is a block diagram showing Embodiment 1 of a moving image playback apparatus of the present invention.
FIG. 2 is a block diagram illustrating a configuration example of a reproduction control unit 13 in FIG.
FIG. 3 is an explanatory diagram for explaining moving image reproduction by the moving image reproducing device of the present embodiment;
FIG. 4 is a block diagram showing a second embodiment of the moving image playback apparatus of the present invention.
5 is a block diagram illustrating a configuration example of a playback control unit 14 in FIG. 4. FIG.
FIG. 6 is a block diagram showing an embodiment of a moving image playback system of the present invention.
FIG. 7 is an explanatory diagram for explaining wavelet transformation in the JPEG2000 system.
FIG. 8 is an explanatory diagram for explaining a code block CB which is a minimum coding unit of a code string in the JPEG2000 system.
FIG. 9 is an explanatory diagram for explaining moving image reproduction by the moving image reproducing device;
FIG. 10 is a block diagram illustrating an example of a conventional image decoding device.
[Explanation of symbols]
1 Stream transmission station
2 Stream receiving stations
11 Frame extractor
12 Stream end
13, 14 Playback control unit
15, 25 Communication interface
21,23 JPEG2000 decoder
22 Image display
26 Simplified JPEG2000 decoding unit
27 Simplified unit

Claims (10)

A JPEG2000 decoding unit that decodes a compressed image data stream of a plurality of frames, each compressed and encoded as a moving image data stream of a JPEG2000 file for moving images, and an image display unit that displays an image in units of frames and reproduces a moving image. In the video playback device provided,
Extract related information of a video data stream from the video JPEG2000 file, and input or skip the video data stream as appropriate for each frame based on an input control signal to extract a compressed image data stream of a playback frame from the video data stream A frame extractor;
A stream termination unit that inputs a compressed image data stream of the playback frame, adds a termination code at a position corresponding to a termination control signal, and outputs the termination code to the JPEG2000 decoding unit;
The input position and the end position of the compressed image data stream of the playback frame are calculated based on the externally set playback environment condition and the related information, and the input control signal and the end control signal are generated for each frame based on the calculation result. And a playback control unit. The JPEG2000 decoding unit is one of a plurality of software function means executed in parallel by a general-purpose CPU and a program, and outputs current decoding capability information,
The reproduction control unit calculates an input position and a termination position of a compressed image data stream of the reproduction frame based on the decoding capability information, and generates the input control signal and the termination control signal based on a calculation result. Video playback device. A JPEG2000 decoding unit that decodes a compressed image data stream of a plurality of frames, each compressed and encoded as a moving image data stream of a JPEG2000 file for moving images, and an image display unit that displays an image in units of frames and reproduces a moving image. In the video playback device provided,
A frame extraction unit for extracting related information of a video data stream from the video JPEG2000 file and extracting a compressed image data stream of a playback frame from the video data stream;
A stream termination unit that inputs a compressed image data stream of the playback frame, adds a termination code at a position corresponding to a termination control signal, and outputs the termination code to the JPEG2000 decoding unit;
A playback control unit that calculates the end position of the compressed image data stream of the playback frame based on externally set playback environment conditions and the related information, and generates the end control signal for each frame unit based on the calculation result. A featured video playback device. The JPEG2000 decoding unit is one of a plurality of software function means executed in parallel by a general-purpose CPU and a program, and outputs current decoding capability information,
4. The moving image playback apparatus according to claim 3, wherein the playback control unit calculates the end position of the compressed image data stream of the playback frame based on the decoding capability information and generates the end control signal based on the calculation result.   The moving image reproducing apparatus according to claim 1 or 3, wherein the reproduction environment condition includes a resolution and a frame rate of the reproduced moving image. A stream receiving station that receives a compressed image data stream of a plurality of frames, each of which is compressed and encoded as a moving image data stream of a JPEG2000 file corresponding to a moving image, decodes the frame by frame, displays an image by the frame, and reproduces the moving image;
Corresponding to the playback environment conditions of the stream receiving station, a stream transmission is performed in which a compressed image data stream of a playback frame is extracted from a moving picture data stream of a JPEG2000 file corresponding to a moving picture, and is terminated for each frame unit and transmitted to the stream receiving station A video playback system comprising a station. The stream transmitting station extracts the relevant information of the video data stream from the video JPEG2000 file and compresses the playback frame from the video data stream by appropriately inputting or skipping the video data stream in units of frames based on an input control signal. A frame extraction unit for extracting an image data stream;
A stream termination unit that inputs a compressed image data stream of the reproduction frame, adds a termination code at a position corresponding to a termination control signal, and transmits the termination code to the stream reception station;
Reproduction control for calculating the input position and the end position of the compressed image data stream of the reproduction frame based on the reproduction environment condition and the related information and generating the input control signal and the end control signal for each frame unit based on the calculation result The moving image reproduction system according to claim 6, further comprising: a unit. The JPEG2000 decoding unit which decodes the compressed image data stream of the plurality of frames and outputs the current decoding capability information as one of a plurality of software function means executed in parallel by a general-purpose CPU and a program by the stream receiving station With
The reproduction control unit calculates an input position and a termination position of the compressed image data stream of the reproduction frame based on the decoding capability information, and generates the input control signal and the termination control signal for each frame based on the calculation result. The moving image reproduction system according to claim 7.   The moving image reproduction system according to claim 6, wherein the reproduction environment condition includes a resolution and a frame rate of the reproduced moving image.   The moving image reproduction system according to claim 6, 7, 8, or 9, comprising a plurality of the stream receiving stations.

Images