JP2017204767A - Video transmitter and video transmission method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a video transmitter and a video transmission method capable of transmitting a high quality video even in a situation where a wide bandwidth cannot be get, when transmitting a video via a network of IP cameras, or the like.SOLUTION: A transmitter 1 connected with an imaging apparatus 3 including an imaging section 31 for imaging a video, an encode section 32 for generating first stream data by encoding the captured videos, and an output section 33 for outputting the first stream data thus generated, directly or via a network, and transmitting the videos to a reception terminal 6 via a network 4, is further provided with a receiving section 11 for receiving the first stream data from the imaging apparatus 3, a storage section 12 for storing received or generated stream data, a processing section 13 for generating second stream data by re-encoding and compressing the first stream data stored in the storage section 12, and a transmitting section 14 for transmitting the second stream data.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a moving image transmission system for transmitting a moving image via a network, and in particular, a moving image transmission system and a moving image suitable for transmitting a moving image by communication means having a relatively narrow band such as wireless communication. The transmission method.

  In recent years, with the spread of broadband networks, surveillance systems in which IP cameras are installed indoors and outdoors, moving image data is transmitted via the network, and can be viewed and stored at remote locations have become widespread (for example, patents). (See FIG. 6 of Document 1). In a conventional surveillance camera system, captured moving image data is compressed and distributed over a network. As the moving image data compression methods, MPEG2, MPEG4, H.264, and the like are used. H.264 is known.

JP 2012-90172 A

  The conventional technology can transmit moving image data with high image quality and high frame rate in real time stably in an environment where it can be connected to a broadband network with a wide bandwidth such as an optical fiber, but the bandwidth is relatively low. In an environment where only a small and highly variable network can be connected, there is a problem that frames may be dropped or transmission may not be possible.

  Among broadband networks, the development of optical fiber networks with wide and stable bandwidths is concentrated in densely populated areas such as urban areas, and there are many regions that rely on ADSL and wireless communications, which are relatively narrow and unstable. Conventionally, when moving image data with a large data capacity is transmitted in real time in an area where the network bandwidth is relatively narrow and unstable, the image quality of the image data is reduced, the size is reduced, or the frame rate is lowered. Therefore, there has been a demand for a high image transmission technology with a high frame rate.

  Therefore, the present invention is capable of transmitting a high-quality moving image with smooth motion and a clean image even when a wide band cannot be obtained when transmitting a moving image via a network such as an IP camera. A transmission apparatus and a moving image transmission method are provided.

  In order to solve the above-described problem, the present invention provides an imaging unit that captures a moving image, an encoding unit that encodes the captured moving image to generate first stream data, and outputs the generated first stream data A moving image transmission device that is connected to an imaging device including an output unit directly or via a network and transmits a moving image to a receiving terminal via the network, and receives the first stream data from the imaging device Receiving means; storage means for storing received or generated stream data; processing means for generating second stream data compressed by re-encoding the first stream data stored in the storage means; and the second The present invention provides a moving image transmission apparatus having transmission means for transmitting stream data.

  In the moving image transmission apparatus of the present invention, the re-encoding process includes a thinning process for converting the image data of the first stream data into YUV image data including a luminance signal and a color difference signal, and thinning the color difference signal. .

  In the moving image transmission apparatus of the present invention, the first stream data is obtained by converting the captured image data into YUV image data composed of a luminance signal and a color difference signal, and the color difference signal is thinned out YUV 4: 2: 2 format or YUV 4: 2: 0 format, and the re-encoding process includes a thinning process for further thinning out the color difference signal from the image data of the first stream data.

  In the moving image transmission apparatus of the present invention, the second stream data is in a YUV 4: 2: 0 format.

  In the moving image transmission apparatus of the present invention, the re-encoding process includes a reduction process for reducing the size of the image data after the thinning process.

  The moving picture transmission apparatus of the present invention has a router function.

  The moving image transmission apparatus of the present invention is controllably connected to the cloud system via the network, and the transmission means includes means for uploading the second stream data to the cloud system.

  The present invention is also a moving image transmission method for transmitting first stream data distributed from a moving image capturing apparatus connected to a network, wherein the first stream data is received from the moving image capturing apparatus. A temporary storage step of temporarily storing the received first stream data, a processing step of generating a second stream data compressed by re-encoding the stored first stream data, and the second stream data Is provided, and a moving image transmission method having a storing step for transmitting the second stream data and a transmitting step for transmitting the second stream data is provided.

  In the moving image transmission method of the present invention, the first stream data includes image data obtained by converting captured image data into YUV image data including a luminance signal and a color difference signal, and thinning out the color difference signal. In the YUV format, the processing step includes a step of further thinning out the color difference signal from the image data of the first stream data and reconverting it to the YUV format.

  In the moving image transmission method of the present invention, the processing step further includes a step of reducing the size of the image data after further thinning out the color difference signal from the image data of the first stream data.

  In the moving image transmission method of the present invention, the communication step uploads the second stream data to a cloud system that is controllably connected via a network, and the request is received from the receiving terminal. Transmitting two stream data.

  The moving image transmission apparatus of the present invention includes an imaging unit that captures a moving image, an encoding unit that encodes the captured moving image to generate first stream data, and an output unit that outputs the generated first stream data A moving image transmission device that is connected directly or via a network to an imaging device, and transmits a moving image to a receiving terminal via the network, and receiving means that receives the first stream data from the imaging device Storage means for storing received or generated stream data, processing means for generating second stream data compressed by re-encoding the first stream data stored in the storage means, and the second stream data And transmitting the first stream data generated by the imaging device such as an IP camera. Since the compressed second stream data is generated and transmitted, there is an effect that a moving image with smooth motion can be transmitted in real time while preventing a frame drop even through a network having a relatively narrow band and not stable. .

  In the moving image transmission apparatus of the present invention, the re-encoding process includes a thinning process for converting the image data of the first stream data into YUV image data including a luminance signal and a color difference signal, and thinning the color difference signal. Compresses the amount of data by thinning out the color difference signal that has a small effect on human vision while maintaining the resolution, size, and frame rate of Y image data that has a large effect on human vision. Thus, it is possible to transmit a high-quality moving image with a clean image.

  In the moving image transmission apparatus of the present invention, the first stream data is obtained by converting the captured image data into YUV image data composed of a luminance signal and a color difference signal, and the color difference signal is thinned out YUV 4: 2: 2 format or YUV4: 2: 0 format, and the re-encoding process includes a thinning process that further thins out the color difference signal from the image data of the first stream data, thereby greatly compressing the YUV4: 2: 2 format. Or, the first stream data in the YUV4: 2: 0 format is further processed by thinning out the color difference signal to compress the data volume, so frames are prevented from dropping even through networks such as wireless communication with narrow bandwidth and instability. On the other hand, there is an effect that a moving image with smooth motion can be transmitted in real time.

  In the moving image transmission apparatus of the present invention, since the second stream data is in the YUV 4: 2: 0 format, there is an effect that a high compression rate can be obtained using human visual characteristics.

  In the moving image transmission apparatus of the present invention, the re-encoding process includes a reduction process for reducing the size of the image data after the decimation process, thereby further minimizing degradation of image quality. Compression rate can be obtained. This moving image transmission apparatus has an effect of transmitting a moving image having a smooth motion in real time while reliably preventing frame dropping, even through a network such as wireless communication, which has a narrow band and is not stable.

  Further, the moving image transmission apparatus of the present invention has a router function, so that the first stream data output from the imaging apparatus is compressed and converted into router equipment that connects the imaging apparatus to a wide area network such as the Internet, A function of transmitting the second stream data can be added. This moving image transmission apparatus can be installed in a place where even an existing IP camera can be connected only to a relatively narrow and unstable network, and can transmit a moving image with smooth motion in real time. There is an effect that can be done.

  Further, the moving image transmission apparatus of the present invention is controllably connected to the cloud system via the network, and the transmission means includes means for uploading the second stream data to the cloud system. While streaming or streaming distribution of stream data from a moving image transmission device, when the bandwidth on the moving image transmission device side decreases, stream data can be distributed or recorded and distributed from the cloud system, and moving images are always received. There is an effect that can be transmitted to the terminal.

  The moving image transmission method of the present invention is a moving image transmission method for transmitting first stream data distributed from a moving image capturing apparatus connected to a network, wherein the first stream data is transmitted from the moving image capturing apparatus. A temporary storage step for temporarily storing the received first stream data, a processing step for generating a second stream data compressed by re-encoding the stored first stream data, Second stream data obtained by further compressing first stream data generated by an imaging device such as an IP camera by including a storage step for storing the second stream data and a transmission step for transmitting the second stream data. Can be generated and sent in real time. In addition, the present moving image transmission method can record and distribute the stored second stream data when a necessary bandwidth cannot be obtained, and thus has an effect of reliably transmitting a moving image.

  In the moving image transmission method of the present invention, the first stream data includes image data obtained by converting captured image data into YUV image data including a luminance signal and a color difference signal, and thinning out the color difference signal. YUV format, and the processing step further includes the step of thinning out the color difference signal from the image data of the first stream data and reconverting it to the YUV format, so that Y image data having a great influence on human vision can be obtained. Since the data amount is compressed by thinning out the color difference signal that has little effect on human vision while maintaining the resolution, size, and frame rate, it is possible to transmit high-quality moving images with smooth appearance and clean images. it can. This moving image transmission method compresses the amount of data by further thinning out the color difference signal to the first stream data in the YUV format, so frames are dropped even over a network such as a wireless communication with a narrow band that is not stable. It is possible to transmit a moving image that is smooth and beautiful in real time while preventing the image from moving.

  In the moving image transmission method of the present invention, the processing step includes a step of reducing the size of the image data after further thinning out the color difference signal from the image data of the first stream data. An even higher compression ratio can be obtained while minimizing deterioration. This moving image transmission method has an effect that a moving image with smooth and smooth movement can be transmitted in real time while reliably preventing frame dropping even through a network such as wireless communication which is not stable due to a narrow band.

  In the moving image transmission method of the present invention, the communication step uploads the second stream data to a cloud system that is controllably connected via a network, and the request is received from the receiving terminal. Sending the two stream data, and in the normal case, the stream data is directly distributed live or recorded, while the stream data is distributed live from the cloud system when the bandwidth of the connected network decreases. Alternatively, it can be recorded and distributed, and a moving image can be always transmitted to the receiving terminal.

The block diagram which shows one Example of the moving image transmission apparatus which concerns on this invention. The flowchart which shows one Example of the moving image transmission method which concerns on this invention.

  Embodiments of the present invention will be described based on examples shown in the drawings. FIG. 1 is a block diagram showing an embodiment of a moving image transmission apparatus according to the present invention.

  The moving image transmission apparatus 1 of the present invention includes an imaging unit (imaging unit 31) that captures a moving image, an encoding unit (encoding unit 32) that encodes the captured moving image to generate first stream data, An apparatus for transmitting a moving image to the receiving terminal 6 via the network 4 directly or via a network connected to the imaging device 3 including the output means (output unit 33) for outputting the first stream data. , Stored in the receiving means (receiving section 11) for receiving the first stream data from the imaging device 3, the storing means (storage section 12) for storing the received or generated stream data, and the storing means (storage section 12). Processing means (processing unit 13) for generating second stream data obtained by re-encoding and compressing the first stream data, and transmission for transmitting the second stream data Having a means (transmission unit 14), the.

  The inventors of the present application have many portions that do not move, such as a background, in a moving image captured when the imaging device 3 such as an IP camera is installed as a surveillance camera. From the YUV format used in the IP camera or the like. Furthermore, we focused on the fact that even if the color difference information is thinned out, the effect on the visual image quality is small. Then, the present inventors have found that image data that has already been irreversibly compressed in the imaging apparatus 3 can be further improved by further reducing the compression rate by thinning out the color difference information and irreversibly compressing the image data.

  The present invention provides a YUV image for general transcode that lowers the resolution or irreversibly compresses interframe prediction information with few operations only when the moving image compression code before and after conversion of moving image data is the same type. By adding compression based on the color difference information of the data, high compression processing that has never been possible has been made possible. The transmission apparatus 1 of the present application can reduce the size of moving image data up to about 500 kbps while maintaining a high-definition image quality and a general frame rate of 30 fps, and can live a visually beautiful moving image while leaving color information. Made it possible to deliver.

[Imaging device]
In the present embodiment, the imaging device 3 is an IP camera installed as a surveillance camera, for example, an imaging unit 31 that captures a moving image, and an encoding unit that encodes the captured moving image to generate first stream data 32 and an output unit 33 that outputs the generated first stream data.

  The imaging unit 31 includes a lens and an imaging element (such as a CCD or CMOS). Light from the subject passes through the lens and forms an image on the image sensor, and is photoelectrically converted by the image sensor to be converted into RGB image data. The imaging unit 31 supplies the RGB image data to the encoding unit 32 according to the setting, or converts the RGB image data into YUV image data including a luminance signal and a color difference signal, and supplies the YUV image data to the encoding unit 32. In this embodiment, the size of the image data is 1980 × 1080 pixels and the frame rate is 30 fps.

  In this embodiment, the encoding unit 32 thins out the color difference signal into the YUV 4: 2: 2 format or the YUV 4: 2: 0 format without changing the size and the frame rate of the image data. The first stream data is generated by compression processing according to the H.264 standard. The generated first stream data is temporarily stored in the internal memory and output from the output unit 33. The output unit 33 outputs stream data requested by RTSP or HTTP to the transmission apparatus 1.

  The encoding unit 32 converts the moving image data to the H.264 format. The compression processing is not limited to the H.264 standard, but MPEG-1, MPEG-2, MPEG-4, and H.264. The compression processing may be performed according to other standards such as the H.263 standard. The imaging device 3 may include a storage device (not shown), and the encoding unit 32 may generate motion JPEG standard moving image data in addition to the first stream data, and store the generated motion image data in the storage device.

  The imaging device 3 only needs to have a configuration capable of outputting captured moving image data in real time, and various cameras capable of capturing moving images such as a widely used IP camera can be used.

[Transmission equipment]
The transmission device 1 includes a receiving unit 11 that receives first stream data from the imaging device 3, a storage unit 12 that stores received or generated stream data, and a re-encoding process for the first stream data stored in the storage unit 12. And a processing unit 13 that generates the compressed second stream data and a transmission unit 14 that transmits the second stream data.

  The transmission apparatus 1 and the imaging apparatus 3 are connected to the imaging apparatus 3 from the transmission apparatus 1 via a communication cable 2 such as PoE connection so that power can be supplied. In the illustrated embodiment, one imaging device 3 is connected to one transmission device 1, but a plurality of imaging devices 3 may be connected to the transmission device 1. Further, when the power supply of the imaging device 3 can be ensured, they may be connected to each other via a general network such as a wired or wireless LAN.

  In the embodiment, the transmission device 1 has a router function and is wirelessly connected to a wide area network 4 such as the Internet. The imaging device 3 is connected to the network 4 via the transmission device 1, and can distribute a moving image to a receiving terminal 6 that can access the network 4. In addition, the imaging apparatus 3 can be set for various settings such as shooting conditions from the receiving terminal 6. The transmission device 1 may be connected to the network 4 by wire, but it is preferable that the transmission device 1 can be connected wirelessly because the installation range of the imaging device 3 is expanded.

  The receiving unit 11 receives the first stream data from the imaging device 3 via the communication cable 2 in real time, and temporarily stores the stream profile data in the storage unit 12 as it is.

  The storage unit 12 includes a memory such as a ROM or a RAM and a hard disk, for example. The storage unit 12 is assigned with a program area for storing a program for executing various processes of the processing unit 13 and a work area for temporarily storing work data generated during the execution of the program. It has been. The storage unit 12 stores the first stream data received from the imaging device 3 and the second stream data generated by the processing unit 13.

  The processing unit 13 is an electronic circuit such as a processor, and performs control of the transmission apparatus 1 and re-encoding processing of the first stream data stored in the storage unit 12. In the present embodiment, the processing unit 13 performs transcoding processing for re-encoding the first stream data without decoding. The processing unit 13 performs a thinning process for further thinning out the color difference signal from the YUV image data of the first stream data, and then performs a reduction process for reducing the size of the image data. The image data size is reduced to, for example, 1280 × 720 pixels. In this embodiment, the frame rate is not changed from 30 fps for smooth playback of moving images.

  In the color difference signal thinning process, the luminance signal (Y) of the YUV image data is left as it is, and only the color difference signals (U, V) are thinned out. In this embodiment, the image is converted into 4: 2: 0 format in which the horizontal and vertical directions of U and V are thinned in half. The processing unit 13 converts the first stream data to H.264. In addition to the general transcoding process, the color difference signal is thinned out so that the bit rate of the second stream data generated by the re-encoding process according to the H.264 standard is about 500 kbps. For example, moving image data is compressed at level 3 of the baseline profile. Note that moving image data compression processing is H.264 in the current standard. However, the standard or format is not limited to the embodiment, and other standards and formats may be used.

  The processing unit 13 includes a YUV filter that changes components of the YUV image data. In the YUV filter, scale parameters are set for each YUV, the Y parameter adjusts the luminance, the U parameter adjusts the blue color balance, and the V parameter adjusts the red balance.

  When the first stream data received by the receiving unit 11 is in the RGB format, the processing unit 13 converts the image data of the first stream data into YUV image data including a luminance signal (Y) and color difference signals (U, V). Thereafter, a thinning process for thinning out the color difference signals is performed. The processing unit 13 converts the image data into a 4: 2: 0 format in which the horizontal and vertical directions of U and V are thinned in half. The processing unit 13 converts the first stream data to H.264. In addition to the general transcoding process, the color difference signal is thinned out so that the bit rate of the second stream data generated by the re-encoding process according to the H.264 standard is about 500 kbps. It is preferable that the receiving unit 11 generates the second stream data in a progressive format regardless of the format of the first stream data.

  The second stream data generated by the processing unit 13 is stored in the storage unit 12 and is transmitted from the transmission unit 14 to the cloud system 5 and the reception terminal 6 via the network 4.

  The transmission unit 14 has a wireless communication function and is wirelessly connected to a wide area network 4 such as the Internet. The transmission unit 14 transmits the generated second stream data to the reception terminal 6 in real time and simultaneously uploads it to the cloud system. Further, the transmission unit 14 records and distributes the second stream data stored in the storage unit 12 in response to a request from the receiving terminal. The transmission unit 14 may be connected to the network 4 by wire.

[Receiving device]
The cloud system 5 is connected to the transmission apparatus 1 via the network 4 and cooperates using an API (Application Programming Interface). The cloud system 5 stores the second stream data uploaded from the transmission device 1 in the storage device. The cloud system 5 can transmit the second stream data to the receiving terminal in real time, and record and distribute the second stream data in response to a request from the receiving terminal.

  The receiving terminal 6 is a personal computer, a tablet terminal, a smartphone, or the like that can be connected to the wide area network 4 such as the Internet. The receiving terminal 6 can access the transmission apparatus 1 or the cloud system 5 to view a moving image captured by the imaging apparatus 3 live or recorded. Further, the receiving terminal 6 can access the cloud system 5 and perform management such as device management and remote operation of the cloud system 5 and setting change of the transmission apparatus 1.

[Transmission device operation]
Hereinafter, the operation of the transmission apparatus 1 according to the first embodiment will be described with reference to FIG. FIG. 2 is a flowchart showing an embodiment of the moving picture transmission method according to the present invention.

  The moving image transmission method of the present invention is a method for transmitting the first stream data distributed from the moving image imaging device 3 connected to the network 4, and receiving the first stream data from the imaging device 3. A temporary storage step for temporarily storing the received first stream data, a processing step for re-encoding the stored first stream data to generate a compressed second stream data, and a second stream data A storage step of storing, and a transmission step of transmitting the second stream data.

  When the imaging unit 31 captures a moving image, the imaging device 3 converts RGB image data including red (R), green (G), and blue (B) images from the luminance signal (Y) and the color difference signals (U, V). Is converted into YUV image data (step S1). The capturing of moving images by the imaging device 3 can be controlled via the network 4.

  The imaging device 3 thins out the color difference signals (U, V) in the YUV 4: 2: 0 format in the encoding unit 32, and the H.264 format. The first stream data is generated by compression processing according to the H.264 standard (step S2). The first stream data has, for example, image data size of 1980 × 1080 pixels and a frame rate of 30 fps. The first stream data preferably uses a progressive signal at the maximum resolution of the imaging device 3.

  The imaging device 3 temporarily stores the generated first stream data in the internal memory (step S3).

  The imaging device 3 waits for a request from the transmission device 1 (step S4). The transmission device 1 requests the imaging device 3 to output the first stream data according to an instruction from the reception terminal 6 or the cloud system 5. The output unit 33 receives the request from the transmission device 1 and outputs the first stream data in real time (step S5).

  When the receiving unit 11 receives the first stream data, the transmission device 1 temporarily stores the stream profile data in the storage unit 12 as it is (step S6). At this time, the data is stored in the MPEG format.

  In the transmission device 1, the processing unit 13 performs the thinning process on only the color difference signals (U, V) while keeping the luminance signal (Y) of the YUV image data as it is (step S7). The processing unit 13 further performs a color difference signal thinning process on the first stream data on which the color difference signal thinning process is performed, using human visual characteristics.

  The processing unit 13 partially corrects the YUV pixel format using a lookup table YUV filter. The thinning processing of the color difference signals (U, V) can be performed by combining pixel thinning and gradation compression.

  The processing unit 13 performs a reduction process for reducing the size of the image data on which the color difference signal has been thinned (step S8). The size of the image data is reduced to, for example, 1280 × 720 pixels. The frame rate is not changed from 30 fps. Since the first stream data generated by the imaging device 3 includes an interlace signal and a progressive signal, the processing unit 13 generates stream data using the progressive signal.

  The processing unit 13 converts the moving image data to H.264. The second stream data is generated by re-encoding processing according to the H.264 standard (step S9). The processing unit 13 specifies that the bit rate of the generated second stream data is 500 kbps or less, and performs compression processing such as inter-frame prediction and entropy coding.

  The transmission apparatus 1 stores the generated second stream data in the storage unit 12 and simultaneously transmits the second stream data to the reception terminal 6 or the cloud system 5 via the network 4 in the transmission unit 14 (step S10). .

  The moving image transmission method of the present invention enables unprecedented high compression processing while maintaining a visually beautiful moving image of color information. This moving image transmission method can reduce the size of moving image data to 500 kbps or less while maintaining high-definition image quality and a general frame rate. As a result, it has become possible to stably deliver live video data in a stable manner even through a network where the uplink communication speed is only about 1 Mbps. In addition, the moving image transmission method of the present invention can reduce the burden on the imaging device 3 and the cloud system 5 by distributing the compression processing of moving image data.

  As another embodiment of the present invention, the transmission apparatus 1 may be a cloud system. At this time, the transmission device 1 and the imaging device 3 are connected via a network. Other configurations are the same as those of the first embodiment.

  When the transmission device 1 is a cloud system, the transmission load of the first stream data from the imaging device 3 to the transmission device 1 cannot be reduced, but the storage capacity and the storage speed of the cloud system are reduced. be able to. Also, live viewing can be performed from the receiving terminal 6 in a narrow band without dropping frames.

DESCRIPTION OF SYMBOLS 1 Transmission apparatus 2 Communication cable 3 Imaging apparatus 4 Network 5 Cloud system 6 Receiving terminal 11 Receiving part 12 Storage part 13 Processing part 14 Transmitting part 31 Imaging part 32 Encoding part 33 Output part

Further, in the moving image transmission method of the present invention, the transmission step uploads the second stream data to a cloud system that is controllably connected via a network, and the request is received from the receiving terminal. Transmitting two stream data.

Further, in the moving image transmission method of the present invention, the transmission step uploads the second stream data to a cloud system that is controllably connected via a network, and the request is received from the receiving terminal. Sending the two stream data, and in the normal case, the stream data is directly distributed live or recorded, while the stream data is distributed live from the cloud system when the bandwidth of the connected network decreases. Alternatively, it can be recorded and distributed, and a moving image can be always transmitted to the receiving terminal.

Claims (11)

Directly or networked to an imaging apparatus including an imaging unit that captures a moving image, an encoding unit that encodes the captured moving image to generate first stream data, and an output unit that outputs the generated first stream data Is a moving image transmission apparatus that transmits a moving image to a receiving terminal via a network,
Receiving means for receiving the first stream data from the imaging device;
Storage means for storing received or generated stream data;
Processing means for generating second stream data obtained by re-encoding and compressing the first stream data stored in the storage means;
Transmitting means for transmitting the second stream data;
A moving image transmission apparatus.   The moving image transmission apparatus according to claim 1, wherein the re-encoding process includes a thinning process in which the image data of the first stream data is converted into YUV image data including a luminance signal and a color difference signal, and the color difference signal is thinned out. The first stream data is in YUV 4: 2: 2 format or YUV 4: 2: 0 format in which captured image data is converted into YUV image data composed of a luminance signal and a color difference signal, and the color difference signal is thinned out. ,
The moving image transmission apparatus according to claim 1, wherein the re-encoding process includes a thinning process for further thinning out the color difference signal from the image data of the first stream data.   The moving image transmission apparatus according to claim 2 or 3, wherein the second stream data is in a YUV 4: 2: 0 format.   The moving image transmission apparatus according to claim 2, wherein the re-encoding process includes a reduction process for reducing a size of the image data after the thinning process.   6. The moving image transmission apparatus according to claim 1, wherein the moving image transmission apparatus has a router function.   The moving image transmission apparatus according to claim 6, which is controllably connected to the cloud system via the network, and wherein the transmission unit includes a unit that uploads the second stream data to the cloud system. A moving image transmission method for transmitting first stream data distributed from a moving image imaging device connected to a network,
A receiving step of receiving the first stream data from the moving image capturing device;
A temporary storage step of temporarily storing the received first stream data;
A process for generating a second stream data obtained by re-encoding and compressing the stored first stream data;
A storing step of storing the second stream data;
A transmission step of transmitting the second stream data;
A moving picture transmission method comprising: The first stream data is a YUV format consisting of image data in which captured image data is converted into YUV image data composed of a luminance signal and a color difference signal, and the color difference signal is thinned out;
The moving image transmission method according to claim 8, wherein the processing step includes a step of further thinning out the color difference signal from the image data of the first stream data and reconverting it into a YUV format.   The moving image transmission method according to claim 9, wherein the processing step includes a step of reducing the size of the image data after further thinning out the color difference signal from the image data of the first stream data.   The communication step includes a step of uploading the second stream data to a cloud system that is controllably connected via a network, and a step of transmitting the second stream data in response to a request from a receiving terminal. The moving image transmission method according to claim 10.

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