JP2019029746A - Video transmission system, video transmitter, video receiver, computer program, video distribution method, video transmission method and video reception method - Google Patents

Abstract

To provide a video transmitter capable of real time distribution of video data maintaining visual identity of recognition object with an original video.SOLUTION: A video transmitter includes an acquisition part for acquiring video data, a receiving part receiving the information for specifying a region of interest in a screen of the video data from a video receiver, a compression section performing compression processing where the transmission rate per unit pixel block in the region of interest is larger than that in the region other than the region of interest, for the video data acquired by the acquisition part, based on the information received by the receiving part, and a transmission section for transmitting the video data compressed by the compression section to the video receiver.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a video transmission system, a video transmission device, a video reception device, a computer program, a video distribution method, a video transmission method, and a video reception method, and in particular, a video transmission system, a video transmission device, and a video reception device that process video data. The present invention relates to a computer program, a video distribution method, a video transmission method, and a video reception method.

  In broadcasting and the like, a technique for transmitting ultra-high definition video data such as 8K UHDTV (Ultra High Definition Television) has been developed.

  For example, Non-Patent Document 1 describes H.264 for compressing video data. H.265 is described.

  H. H.265 (ISO / IEC 23008-2 HEVC) is one of the video compression standards. This is a subsequent format of H.264 / MPEG-4 AVC. H. H.265 has excellent compression efficiency such as optimization of the block size, and is approximately four times the MPEG-2 (H.262) ratio. In comparison with H.264 / AVC, it is said to have about twice the compression performance. H. H.265 is assumed to be used not only for high-resolution video such as Super Hi-Vision (8K, 4320p) but also for video distribution for mobile terminals.

“Wikipedia”, [online], [Search June 21, 2017], Internet <URL: http: // ja. wikipedia. org / wiki / H. 265>

  For example, since ultra-high definition video data such as 8K UHDTV has a transmission rate of several tens of Gbps (gigabits per second) or more, high-speed and large-scale logic circuits and Very large resources such as large capacity memory are required.

  In order to solve this problem, the video signal is compressed before the target processing. In a broadcast system, compressing video before transmission and expanding it when presented on a TV receiver is one typical example. Non-Patent Document 1 used in broadcasting is described in H.264. In order to achieve a high compression rate, compression schemes such as H.265 use intra-frame and inter-frame correlation in addition to complex operations such as spatial frequency processing and advanced coding. In addition, since the batch processing using the information of a plurality of images is necessary, the processing load is very heavy. In addition, the delay time usually exceeds 3 seconds, and it is inevitable that the delay time becomes large.

  On the other hand, the transmitted video data is used for monitoring purposes for monitoring, for example, a suspicious person, the flow of a person, or a visitor. Specifically, a recognition target such as a suspicious person is extracted by performing image recognition processing on the video data. However, H. In a compression method such as H.265, the delay time exceeds 3 seconds. For this reason, H.264 is used for processes that require real-time performance, such as issuing alarm alarms for suspicious persons, monitoring attendees at the entrance gate, and tracking processing of recognition targets. It is difficult to use video data compressed by a compression method such as H.265. That is, since the video data used for the recognition process is a video delayed by about 3 seconds, a delay occurs between the recognition time of the recognition target and the actual time. Note that in this specification, the term image recognition is used to mean both processing for extracting a recognition target from a moving image (video) and processing for extracting a recognition target from a still image (image).

  H. Since the compression method such as H.265 is an irreversible compression method, the sameness between the decompressed video data and the original video data is not maintained. For this reason, it may be difficult to confirm the details of the recognition target that has been image-recognized on the decompressed video data.

  The present invention has been made in view of the above circumstances, and a video transmission system, a video transmission device, and a video reception device capable of real-time distribution of video data that retains the visual identity of the recognition target with the original video An object of the present invention is to provide a computer program, a video distribution method, a video transmission method, and a video reception method.

  To achieve the above object, a video transmission system according to an embodiment of the present invention acquires video data, performs compression processing on the acquired video data, and transmits the compressed video data. A video transmission device that receives the compressed video data from the video transmission device, and decompresses the received video data. The video reception device includes: Information for designating a region of interest in the screen is transmitted to the video transmission device, and the video transmission device per unit pixel block in the region of interest based on the information received from the video reception device. The compression processing in which the transmission rate is larger than the transmission rate per unit pixel block outside the region of interest is performed on the acquired video data.

  A video transmission device according to another embodiment of the present invention includes an acquisition unit that acquires video data, a reception unit that receives information for designating a region of interest in a screen of the video data from the video reception device, Based on the information received by the reception unit, the acquisition unit acquires a compression process in which a transmission rate per unit pixel block in the region of interest is larger than a transmission rate per unit pixel block outside the region of interest. A compression unit that performs the video data, and a transmission unit that transmits the video data that has been compressed by the compression unit to the video reception device.

  According to another aspect of the present invention, there is provided a video reception device having a transmission rate per unit pixel block in a region of interest in a screen larger than a transmission rate per unit pixel block outside the region of interest from the video transmission device. A transmission unit that receives compressed video data, a decompression unit that decompresses the video data received by the reception unit, and a transmission that transmits information for designating the region of interest to the video transmission device A part.

  A computer program according to another embodiment of the present invention is a computer program for causing a computer to function as a video transmission device, the computer from the acquisition unit that acquires video data and the video reception device. A receiving unit that receives information for designating a region of interest in a screen of data, and a transmission rate per unit pixel block in the region of interest outside the region of interest based on the information received by the receiving unit A compression unit that performs compression processing larger than the transmission rate per unit pixel block on the video data acquired by the acquisition unit; and the video data that has been compressed by the compression unit, To function as a transmission unit for transmission to

  A computer program according to another embodiment of the present invention is a computer program for causing a computer to function as a video reception device, wherein the computer is transmitted from the video transmission device to a unit pixel block in a region of interest in a screen. A receiving unit that receives video data subjected to compression processing that is larger than a transmission rate per unit pixel block outside the region of interest, and a decompressing unit that decompresses the video data received by the receiving unit. The information for designating the region of interest is caused to function as a transmission unit that transmits the information to the video transmission device.

  In the video distribution method according to another embodiment of the present invention, the video reception device transmits information for designating a region of interest in the screen to the video transmission device, and the video transmission device transmits the information from the video reception device. , Receiving information for designating the region of interest, the video transmission device acquires video data, and the video transmission device per unit pixel block in the region of interest based on the received information The acquired video data is subjected to a compression process in which a transmission rate is larger than the transmission rate per unit pixel block outside the region of interest, and the video transmission apparatus converts the compressed video data into the video data Transmitted to the video receiving device, the video receiving device receives the compressed video data from the video transmitting device, and the video receiving device has received the compressed processing Decompressing the image data.

  A video transmission method according to another embodiment of the present invention acquires video data, receives information for designating a region of interest in a screen of the video data from a video receiving device, and based on the received information Then, a compression process in which the transmission rate per unit pixel block in the region of interest is larger than the transmission rate per unit pixel block outside the region of interest is performed on the acquired video data, and the compression processing is completed. The video data is transmitted to the video receiving device.

  In the video receiving method according to another embodiment of the present invention, the transmission rate per unit pixel block in the target area in the screen is larger than the transmission rate per unit pixel block outside the target area from the video transmission device. The video data subjected to the compression process is received, the received video data is decompressed, and information for designating the region of interest is transmitted to the video transmission device.

  The present invention can also be realized as a semiconductor integrated circuit that realizes part or all of a video transmission device or a video reception device.

  According to the present invention, real-time distribution of video data that retains the visual identity of the recognition target with the original video is possible.

It is a figure which shows the structure of the video transmission system which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the video transmission apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the structure of the video receiver which concerns on Embodiment 1 of this invention. It is a figure which shows the sequence of the process which a video transmission system performs. It is a figure which shows an example of the image data before a compression process, and an attention area. It is a figure which shows an example of the image data after an expansion process, and an attention area. It is a figure which shows an example of the image data displayed on a display apparatus. It is a flowchart which shows the detail of a compression process (step S3 of FIG. 4). It is a flowchart which shows the detail of an expansion | extension process (step S7 of FIG. 4). It is a figure for demonstrating the compression process of the block data by the high compression part and low compression part which concern on Embodiment 2 of this invention. It is a block diagram which shows the structure of the video receiver which concerns on the modification of this invention.

[Outline of Embodiment of the Present Invention]
First, the outline of the embodiment of the present invention will be listed and described.
(1) A video transmission system according to an embodiment of the present invention includes a video transmission device that acquires video data, performs compression processing on the acquired video data, and transmits the compressed video data. A video reception device that receives the compressed video data from the video transmission device and decompresses the received video data, and the video reception device includes a region of interest in a screen of the video data. Is transmitted to the video transmission device, and the video transmission device determines the transmission rate per unit pixel block in the region of interest based on the information received from the video reception device. The compression processing larger than the transmission rate per unit pixel block outside the region is performed on the acquired video data.

  According to this configuration, the video subjected to the compression processing so that the transmission rate per unit pixel block in the target area designated on the video receiving device side is larger than the transmission rate per unit pixel block outside the target area. Data can be transmitted from the video transmitting device to the video receiving device. As a result, a compression process is performed to maintain the visual identity of the target area of the video data with the original video, while an area outside the target area is maintained regardless of the visual identity with the original video. In addition, the transmission rate can be kept low. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

  (2) Preferably, the video transmission apparatus performs the compression process on the acquired video data in which the compression rate in the region of interest is lower than the compression rate outside the region of interest.

  According to this configuration, it is possible to perform a low compression process with a low compression rate for the region of interest in the video data, and perform a high compression process with a high compression rate for regions outside the region of interest. As a result, a compression process is performed to maintain the visual identity of the target area of the video data with the original video, while an area outside the target area is maintained regardless of the visual identity with the original video. In addition, the transmission rate can be kept low. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

  (3) More preferably, the video transmission apparatus performs block-by-block compression processing on a block in the region of interest among a plurality of blocks obtained by dividing the screen of the video data, and lossless compression processing on video data in the region of interest. Then, the compression processing including at least one processing of non-compression processing for the video data in the region of interest is performed on the acquired video data.

  When compression processing for each block is performed on the region of interest of the video data, the compression processing can be performed without using the intra-frame and inter-frame correlation. For this reason, H.C. Compared to a compression method such as H.265, it is possible to maintain the sameness with the original video at a low compression rate. In addition, when the lossless compression process is performed on the region of interest of the video data, the sameness as the original video can be maintained. Furthermore, even when non-compression processing is performed on the region of interest of the video data, that is, when compression processing is not performed, the sameness as the original video can be maintained.

  (4) The video transmission device may perform the compression process on the acquired video data, in which a frame rate in the region of interest is higher than a frame rate outside the region of interest.

  According to this configuration, the transmission rate per unit pixel block outside the region of interest can be kept low by reducing the frame rate for the region outside the region of interest of the video data. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

  (5) In addition, the video reception device may transmit information for designating the region of interest by a user operation to the video transmission device.

  According to this configuration, the user can view a high-definition video of the region of interest by designating the region of interest for which visual identity is desired to be maintained. That is, when the user designates a region of interest for which high-definition video data is to be viewed with respect to the video reception device, the designation information is transmitted from the video reception device to the video transmission device. The video transmitting apparatus can transmit the video data after the compression processing to the video receiving apparatus after performing a compression process that retains visual identity for the region of interest of the video data.

  (6) Further, the video receiving apparatus performs image recognition processing for recognizing a predetermined target from the video data that has been subjected to the decompression process, and uses the recognized area as the target area as the target area. Information for designating an area may be transmitted to the video transmission apparatus.

  According to this configuration, the region including the target recognized by the image recognition process can be set as the region of interest. Information for designating the region of interest is transmitted from the video receiver to the video transmitter. The video transmitting apparatus can transmit the video data after the compression processing to the video receiving apparatus after performing a compression process that retains visual identity for the region of interest of the video data. For this reason, the user can view a high-definition video of a target included in the region of interest, or perform processing based on high-definition video data on the video receiving device side.

  (7) The video reception device may cut out video data of the region of interest from the video data that has been subjected to the decompression process.

  According to this configuration, the video receiving apparatus can cut out the video data of the region of interest and process the cut out video data. Thereby, for example, only the video data of the region of interest can be displayed on the display device.

  (8) The video receiving apparatus may cut out the video data of the region of interest from the video data that has been subjected to the compression processing, and may perform the expansion processing on the cut out video data.

  According to this configuration, after the video data of the region of interest is cut out, the decompression process can be performed only on the cut out video data. That is, there is no need to perform decompression processing on video data that has not been cut out. For this reason, it is possible to reduce the memory capacity required for the decompression process provided in the video reception device.

  (9) A video transmission device according to another embodiment of the present invention includes an acquisition unit that acquires video data, and reception that receives information for designating a region of interest in the screen of the video data from the video reception device. And the compression processing in which the transmission rate per unit pixel block in the region of interest is larger than the transmission rate per unit pixel block outside the region of interest, based on the information received by the receiving unit and the receiving unit A compression unit that performs the video data acquired by the unit, and a transmission unit that transmits the video data that has been compressed by the compression unit to the video reception device.

  According to this configuration, the video subjected to the compression processing so that the transmission rate per unit pixel block in the target area designated on the video receiving device side is larger than the transmission rate per unit pixel block outside the target area. Data can be transmitted from the video transmitting device to the video receiving device. As a result, a compression process is performed to maintain the visual identity of the target area of the video data with the original video, while an area outside the target area is maintained regardless of the visual identity with the original video. In addition, the transmission rate can be kept low. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

  (10) A video reception device according to another embodiment of the present invention is configured such that a transmission rate per unit pixel block in a region of interest in a screen is a transmission rate per unit pixel block outside the region of interest from the video transmission device. A receiving unit that receives video data that has undergone a larger compression process, an expanding unit that expands the video data received by the receiving unit, and information for designating the area of interest to the video transmitting device. A transmission unit for transmission.

  According to this configuration, the video subjected to the compression processing so that the transmission rate per unit pixel block in the target area designated on the video receiving device side is larger than the transmission rate per unit pixel block outside the target area. Data can be received from the video transmission device. As a result, a compression process is performed to maintain the visual identity of the target area of the video data with the original video, while an area outside the target area is maintained regardless of the visual identity with the original video. In addition, the transmission rate can be kept low. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

  (11) A computer program according to another embodiment of the present invention is a computer program for causing a computer to function as a video transmission device. The computer program includes an acquisition unit that acquires video data and a video reception device. A receiving unit that receives information for designating a region of interest in the screen of the video data, and a transmission rate per unit pixel block in the region of interest based on the information received by the receiving unit. A compression unit that performs compression processing on the video data acquired by the acquisition unit that is larger than a transmission rate per unit pixel block outside the region, and the video data that has been compressed by the compression unit, It is made to function as a transmission part which transmits to a video receiver.

  According to this configuration, the computer can function as the video transmission device described above. For this reason, the same operation and effect as the above-mentioned video transmission device can be produced.

  (12) A computer program according to another embodiment of the present invention is a computer program for causing a computer to function as a video reception device, and the computer is moved from the video transmission device to a unit in a region of interest in a screen. A receiving unit that receives video data subjected to compression processing in which a transmission rate per pixel block is larger than a transmission rate per unit pixel block outside the region of interest, and decompresses the video data received by the receiving unit The expansion unit and information for specifying the region of interest are caused to function as a transmission unit that transmits to the video transmission device.

  According to this configuration, the computer can function as the above-described video receiving device. For this reason, the same operation and effect as the above-described video receiving device can be obtained.

  (13) In the video distribution method according to another embodiment of the present invention, the video reception device transmits information for designating a region of interest in the screen to the video transmission device, and the video transmission device transmits the video. Information for designating the region of interest is received from a receiving device, the video transmitting device acquires video data, and the video transmitting device receives unit information in the region of interest based on the received information. The acquired video data is subjected to a compression process in which a transmission rate per block is larger than a transmission rate per unit pixel block outside the region of interest, and the video transmission device performs the compression-processed video data To the video receiving device, the video receiving device receives the compressed video data from the video transmitting device, and the video receiving device It said decompressing video data.

  According to this configuration, the video subjected to the compression processing so that the transmission rate per unit pixel block in the target area designated on the video receiving device side is larger than the transmission rate per unit pixel block outside the target area. Data can be transmitted from the video transmitting device to the video receiving device. As a result, a compression process is performed to maintain the visual identity of the target area of the video data with the original video, while an area outside the target area is maintained regardless of the visual identity with the original video. In addition, the transmission rate can be kept low. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

  (14) A video transmission method according to another embodiment of the present invention obtains video data, receives information for designating a region of interest in a screen of the video data from a video reception device, and receives the received information. Based on the information, the obtained video data is subjected to compression processing in which the transmission rate per unit pixel block in the region of interest is larger than the transmission rate per unit pixel block outside the region of interest, and the compression The processed video data is transmitted to the video receiver.

  According to this configuration, the processing corresponding to the processing unit included in the video transmission device described above is included as a step. For this reason, the same operation and effect as the above-mentioned video transmission device can be produced.

  (15) In a video receiving method according to another embodiment of the present invention, a transmission rate per unit pixel block in a region of interest in a screen is transmitted from a video transmission device per unit pixel block outside the region of interest. Video data that has been subjected to compression processing larger than that, receives the video data, expands the received video data, and transmits information for designating the region of interest to the video transmission apparatus.

  According to this configuration, the processing corresponding to the processing unit provided in the above-described video reception device is included as a step. For this reason, the same operation and effect as the above-mentioned video receiving device can be produced.

[Details of the embodiment of the present invention]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Numerical values, shapes, components, arrangement positions and connection forms of components, steps, order of steps, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. The invention is specified by the claims. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept of the present invention are not necessarily required to achieve the object of the present invention. It will be described as constituting a preferred form.

  Moreover, the same code | symbol is attached | subjected to the same component. Since their functions and names are also the same, their description will be omitted as appropriate.

(Embodiment 1)
<Overall configuration of video transmission system>
FIG. 1 is a diagram showing a configuration of a video transmission system according to Embodiment 1 of the present invention.
With reference to FIG. 1, the video transmission system 1 includes a video transmission device 10, a video reception device 20, and a display device 40. The video transmission device 10 and the video reception device 20 are connected to each other via a network 50. The display device 40 is connected to the video reception device 20.

  The video transmission device 10 transmits video data obtained by shooting the shooting target to the video reception device 20 via the network 50.

  The video reception device 20 receives video data from the video transmission device 10 and displays the received video data on the display device 40.

  For example, the video transmission device 10 is installed at a position where the monitoring target area 2 can be photographed, and the video reception device 20 and the display device 40 are installed, for example, in a management office.

<Configuration of Video Transmission Device 10>
FIG. 2 is a block diagram showing a configuration of video transmission apparatus 10 according to Embodiment 1 of the present invention.

With reference to FIG. 2, the video reception device 20 includes an imaging unit 11, an acquisition unit 12, a block division unit 13, a data distribution unit 14, a compression unit 15, an encoding unit 16, and a transmission unit 17. The receiving unit 18 is provided.
The compression unit 15 includes a high compression unit 15A and a low compression unit 15B.

Some or all of these processing units are realized by hardware including an integrated circuit such as an application specific integrated circuit (ASIC) or a field-programmable gate array (FPGA). However, all or a part of the processing units other than the imaging unit 11 among these configurations can be realized by a computer. That is, these processing units are realized as functional processing units by executing a computer program on an arithmetic processing device such as a CPU (Central Processing Unit) included in the computer.
Note that the imaging unit 11 may be provided separately from the video transmission device 10.

  The imaging unit 11 captures a high-definition video to be captured. The video includes a plurality of screens. For example, 60 fps (frame per second) video data includes 60 screens per second.

  More specifically, the imaging unit 11 generates video data of a shooting target having a resolution of 8K UHDTV according to, for example, a dual green method or a 4: 2: 2 method. This video data includes screen data for each screen.

  The transmission rate of 60 fps video data generated in accordance with the dual green method is, for example, 23.89 Gbps or 19.91 Gbps. The transmission rate of video data generated according to the 4: 2: 2 system is, for example, 47.78 Gbps or 39.81 Gbps.

  The acquisition unit 12 acquires video data to be imaged taken by the imaging unit 11 from the imaging unit 11 and outputs the video data to the block division unit 13.

  When the block division unit 13 receives video data from the acquisition unit 12 and secures image data for one screen, the block division unit 13 divides one screen indicated by the secured screen data into a plurality of blocks.

  Specifically, the block dividing unit 13 divides the screen indicated by the screen data into a plurality of blocks having the same shape and the same size. More specifically, the block dividing unit 13 divides the screen into blocks that are sliced for each of one or more rows, is divided into blocks that are sliced for each of one or more columns, or is vertically n × horizontal m. Or divided into blocks each having n (where n and m are positive integers) pixels.

  The shape of each block may be any shape. Moreover, the size of each block may be arbitrary. However, it is preferable to unify the shape and size of each block because convenience is enhanced. Further, the compression rate can be increased as the block size increases. However, since the processing load, the processing circuit, the memory capacity required for processing, and the processing time increase, it is preferable to set the size appropriately.

  The block division unit 13 outputs the image data in the block (hereinafter also referred to as block data) to the data distribution unit 14 in the order of the position on the screen of the block.

  Data distribution unit 14 distributes block data received from block division unit 13. More specifically, the data distribution unit 14 refers to information (hereinafter also referred to as “focused area designation information”) for designating a focused area described later, and the block to which each block data belongs becomes the focused area. Determine whether it is included. The attention area is an area in which the video receiving device 20 or the user of the video receiving device 20 is focused. It is also possible to set the entire screen as a region of interest. In some cases, the region of interest does not exist in the screen.

  If the data distribution unit 14 determines that the block is included in the region of interest, that is, if the data distribution unit 14 determines that the block is located in the region of interest, the block data of the block is output to the low compression unit 15B. To do. If the entire screen is the region of interest, the data distribution unit 14 outputs block data of all blocks included in one screen to the low compression unit 15B. On the other hand, when there is no region of interest in the screen, the data distribution unit 14 does not output any data to the low compression unit 15B for the screen.

  If the data distribution unit 14 determines that the block is not included in the region of interest, that is, if the data distribution unit 14 determines that the block is located outside the region of interest, the data distribution unit 14 converts the block data of the block to the high compression unit 15A. Output to. When the entire screen is the region of interest, the data distribution unit 14 does not output any data to the high compression unit 15A for the screen. On the other hand, when there is no region of interest in the screen, the data distribution unit 14 outputs block data of all blocks included in one screen to the high compression unit 15A.

  Note that if a part of the block is included in the region of interest, the data distribution unit 14 can determine that the block is included in the region of interest.

  The high compression unit 15A receives block data from the data distribution unit 14 and compresses the block data according to a compression method with a higher compression ratio than the low compression unit 15B. For example, the high compression unit 15A may compress the block data in accordance with a compression method called JPEG2000. Note that the compression method of the high compression unit 15A is not limited to JPEG2000, and any other method may be used as long as the compression rate is higher than that of the low compression unit 15B.

  The low compression unit 15B receives block data from the data distribution unit 14 and compresses the block data according to a compression method with a lower compression rate than the high compression unit 15A. The low compression unit 15B irreversibly compresses block data using, for example, an algorithm called Visually Loss Compression or Visually Reversible Compression that can set the size after compression. The lossy compression algorithm used in the low compression unit 15B is mounted on, for example, a dedicated semiconductor integrated circuit. Here, irreversible compression is compression that makes it impossible to return the block data after compression to the block data before compression. When the compression process for each block data is performed on the region of interest of the video data, the compression process can be performed without using the intra-frame and inter-frame correlation. For this reason, H.C. Compared to a compression method such as H.265, the compression rate is low, and the visual identity with the original video can be maintained. Here, maintaining the visual identity with the original video means that when the user compares the video before compression with the video after compression and expansion, the difference is hardly known.

  Note that the low compression unit 15B can also compress the block data using a lossless compression algorithm. In this case, identity with the original video can be maintained.

  The low compression unit 15B may perform non-compression processing that does not compress block data. That is, the low compression unit 15B may output the block data received from the data distribution unit 14 without compression. Also in this case, the identity with the original video can be maintained.

  Note that the algorithm used in the high compression unit 15A and the low compression unit 15B is preferably mounted on, for example, a dedicated semiconductor integrated circuit. Note that the high compression unit 15A and the low compression unit 15B may be realized by executing a computer program based on these algorithms on an arithmetic processing unit such as a CPU of a computer or a CPU core of an FPGA.

  The compression unit 15 adds compression information indicating a compression method and compression parameters (hereinafter also referred to as “compression parameters”) to the block data after compression processing. Specifically, the compression unit 15 adds the compression information H to the block data after the compression processing by the high compression unit 15A, and adds the compression information L to the block data after the compression processing by the low compression unit 15B. However, when the video reception device 20 knows the compression parameter in advance, it is not necessary to notify the video reception device 20 of the compression parameter. For this reason, in such a case, the compression unit 15 does not need to include a compression parameter in the compression information H or the compression information L. Further, when the video receiving apparatus 20 further knows the compression method, it is not necessary to add compression information.

  The compression unit 15 outputs the block data to which the compression information is added to the encoding unit 16. Hereinafter, the block data compressed by the high compression unit 15A or the low compression unit 15B is also referred to as “compressed block data”.

  The encoding unit 16 receives the compressed block data to which the compression information is added from the compression unit 15 and encodes the compressed block data. The encoding unit 16 outputs the encoded compressed block data to the transmission unit 17.

  The transmission unit 17 includes a communication interface, receives the encoded compressed block data from the encoding unit 16, and transmits the compressed block data to the video reception device 20 via the network 50.

  The receiving unit 18 includes a communication interface, and receives attention area designation information from the video receiving device 20 via the network 50. The receiving unit 18 outputs the received attention area designation information to the data distribution unit 14.

<Configuration of Video Reception Device 20>
FIG. 3 is a block diagram showing a configuration of video receiving apparatus 20 according to Embodiment 1 of the present invention.

  The video receiver 20 includes a receiving unit 21, a decoding unit 22, a decompression unit 23, a method processing unit 24, a block synthesis unit 25, a cutout unit 26, a display control unit 27, and an image recognition unit 28. The region-of-interest determination unit 29, the position information acquisition unit 30, and the transmission unit 31 are provided. However, some or all of these processing units may be realized by hardware including a semiconductor integrated circuit such as ASIC or FPGA.

  The video receiver 20 can also be realized by a computer including a CPU, a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. Each processing unit is realized as a functional component by executing a computer program on an arithmetic processing unit such as a CPU.

  The receiving unit 21 includes a communication interface. The receiving unit 21 receives video data obtained by dividing one screen into a plurality of blocks and performing compression processing of image data for each block from the video transmission device 10 via the network 50. More specifically, the receiving unit 21 receives encoded compressed block data in order of position.

  The decoding unit 22 receives the compressed block data received by the receiving unit 21 from the receiving unit 21, and decodes the received compressed block data.

  The decoding unit 22 acquires the compressed information H or the compressed information L from the decoded compressed block data, outputs the compressed block data from which the compressed information H or the compressed information L is removed to the decompressing unit 23 in the order of position, and acquires the compressed block data. The compressed information H or the compressed information L is output to the method processing unit 24 in the order of position.

  When receiving the compression information H from the decoding unit 22, the method processing unit 24 acquires the compression method and compression parameters from the received compression information H, and notifies the expansion unit 23 of the acquired compression method and compression parameters. If the decompression unit 23 knows the compression method or compression parameter in advance, the method processing unit 24 needs to acquire the known information from the compression information H or notify the decompression unit 23 of the information. Absent.

  On the other hand, when receiving the compression information L from the decoding unit 22, the method processing unit 24 acquires the compression method and compression parameters from the received compression information L, and notifies the expansion unit 23 of the acquired compression method and compression parameters. If the decompression unit 23 knows the compression method or compression parameter in advance, the method processing unit 24 needs to acquire the known information from the compression information L or notify the decompression unit 23 of the information. Absent.

  The decompression unit 23 decompresses the compressed block data using the compression parameter notified from the method processing unit 24 in accordance with the compression method notified from the method processing unit 24. Note that the algorithm used in the decompression unit 23 is preferably mounted on, for example, an FPGA or a dedicated semiconductor integrated circuit.

  The block synthesizing unit 25 generates a part of the screen from the block data received from the decompression unit 23 and arranges the generated part of the screen in the order received from the decompression unit 23 to complete one screen. The block synthesizing unit 25 outputs image data indicating one completed screen to the cutout unit 26, the display control unit 27, and the image recognition unit 28.

  The cutout unit 26 cuts out image data of a region of interest determined by a region-of-interest determination unit 29 described later from one-screen image data acquired from the block composition unit 25. The cutout unit 26 outputs the image data of the extracted region of interest to the display control unit 27 and the image recognition unit 28. If the entire screen is the region of interest, the clipping unit 26 outputs the image data for one screen to the display control unit 27 and the image recognition unit 28 without performing the above-described clipping process. On the other hand, when there is no region of interest in the screen, the cutout unit 26 does not perform the cutout process described above, and does not output any data to the display control unit 27 and the image recognition unit 28.

  When the display control unit 27 receives the image data from the block synthesis unit 25, the display control unit 27 performs control to display one screen indicated by the received image data on the display device 40 at a predetermined frame period. Further, the display control unit 27 may perform control to display the image data of the region of interest clipped by the cutout unit 26 so as to be superimposed on one screen as necessary. Further, the display control unit 27 may perform control to display only the image data of the region of interest on the display device 40.

  The image recognition unit 28 extracts a recognition target based on one-screen image data acquired from the block synthesis unit 25 or image data of a region of interest received from the cutout unit 26. For example, when extracting a suspicious person from the monitoring target area 2 as a recognition target, the image recognition unit 28 extracts a recognition target using a background difference method or an inter-frame difference method. Note that the image recognition unit 28, in the image data of the frame after the recognition target is extracted, is based on the image data of the region of interest extracted by the cutout unit 26 or the image data around the region of interest including the region of interest. The recognition target may be extracted. As a result, the image around the extracted recognition target can be efficiently recognized. The image recognition unit 28 outputs the extracted recognition target region information to the attention region determination unit 29.

  The attention area determination unit 29 acquires area information to be recognized from the image recognition unit 28, and determines the attention area based on the acquired area information. For example, the attention area determination unit 29 determines a rectangular area including the recognition target indicated by the acquired area information as the attention area. The rectangular area may include a fixed width margin provided between the rectangular area. If the rectangular area including the recognition target is the same as the entire screen, the attention area determination unit 29 determines the entire screen as the attention area. Further, when the recognition target is not extracted as a result of the recognition processing by the image recognition unit 28, the attention area determination unit 29 does not determine the attention area. As a result, there is no region of interest in the screen.

  Note that the attention area determination unit 29 may determine the attention area based on the position information of the attention area specified by the user and acquired by the position information acquisition unit 30. For example, when the information on the upper left corner coordinates and the lower right corner coordinates of the attention area is acquired as the position information, the attention area determination unit 29 uses the rectangular area defined by the acquired upper left corner coordinates and lower right corner coordinates as the attention area. Determine as. Note that the user can designate the entire screen as the region of interest, or can not designate the region of interest.

  The attention area determination unit 29 outputs attention area designation information for designating the determined attention area to the transmission unit 31. For example, the attention area determination unit 29 outputs information on the upper left corner coordinates and lower right corner coordinates of the attention area to the transmission unit 31 as attention area designation information.

  The position information acquisition unit 30 acquires the position information of the attention area specified by the user by operating the mouse, the keyboard, and the like, and outputs the acquired position information to the attention area determination section 29.

  The transmission unit 31 transmits the attention area designation information received from the attention area determination unit 29 to the video transmission device 10 via the network 50.

<Processing sequence of video transmission system 1>
FIG. 4 is a diagram illustrating a sequence of processing executed by the video transmission system 1.
The video transmission system 1 repeatedly executes the sequence process shown in FIG.
The video receiving device 20 transmits the region-of-interest designation information to the video transmission device 10, and the video transmission device 10 receives the region-of-interest designation information from the video receiving device 20 (S1). Note that, when there is no designation of the attention area by the user or when the recognition target is not extracted by the image recognition unit 28 of the video reception device 20, the attention area designation information need not be transmitted and received.

FIG. 5 is a diagram illustrating an example of image data before compression processing and a region of interest.
For example, it is assumed that the receiving unit 18 of the video receiving device 20 has received attention area designation information that designates the attention area 70 in the image data 60 of one screen shown in FIG.

  Referring to FIG. 4 again, the acquisition unit 12 of the video transmission device 10 acquires image data for one screen obtained by the imaging unit 11 capturing an image of the monitoring target area 2 (S2).

  The block division unit 13, the data distribution unit 14, and the compression unit 15 of the video transmission device 10 perform compression processing for each block data on the image data for one screen acquired by the acquisition unit 12 (S3). Details of the compression processing will be described later with reference to FIG.

  The encoding unit 16 of the video transmitting apparatus 10 encodes the compressed block data for one screen (S4).

  The transmission unit 17 of the video transmission device 10 transmits the encoded compressed block data for one screen to the video reception device 20, and the reception unit 21 of the video reception device 20 receives the compressed block data (S5). .

  The decoding unit 22 of the video reception device 20 decodes the received compressed block data for one screen for each compressed block data (S6).

  The decompression unit 23, the method processing unit 24, and the block composition unit 25 of the video reception device 20 decompress the compressed block data for one screen for each compressed block data (S7). Details of the decompression process will be described later with reference to FIG.

  The cutout unit 26 of the video reception device 20 cuts out image data of the region of interest from one-screen image data obtained by the decompression process (S8).

FIG. 6 is a diagram illustrating an example of image data after expansion processing and a region of interest.
For example, the cutout unit 26 of the video reception device 20 cuts out the image data of the region of interest 71 from the image data 61 of one screen shown in FIG.

  Referring to FIG. 4 again, the display control unit 27 causes the display device 40 to display image data obtained by superimposing the image data of the region of interest 71 on the image data 61 of one screen (S9).

FIG. 7 is a diagram illustrating an example of image data displayed on the display device 40.
For example, the display device 40 causes the display device 40 to display image data 62 as shown in FIG. That is, the display device 40 causes the display device 40 to display the image data 62 obtained by superimposing the image data of the region of interest 71 as the image data 63 on the image data 61 illustrated in FIG. Image data 63 is obtained by enlarging the image data of the region of interest 71. However, the image data 63 may be the image data of the region of interest 71 itself.

  Referring to FIG. 4 again, the image recognition unit 28 of the video reception device 20 extracts a recognition target based on the extracted image data of the region of interest 71. (S10).

  When the recognition target is extracted (YES in S10), the attention area determination unit 29 of the video reception device 20 updates the attention area according to the position of the recognition target (S11).

  When the attention area is designated by the user (YES in S12), the attention area determination unit 29 of the video receiving device 20 updates the attention area to the designated attention area (S13).

  The region-of-interest designation information for designating the region of interest updated in step S11 or S13 is transmitted from the video reception device 20 to the video transmission device 10 in step S1.

FIG. 8 is a flowchart showing details of the compression process (step S3 in FIG. 4).
2 and 8, the block dividing unit 13 divides the image data for one screen acquired by the acquiring unit 12 into a plurality of block data (S21).

  The video transmitting apparatus 10 performs the processing of steps S22 to S26 described below for each block data after division (loop A).

  That is, the data distribution unit 14 refers to the attention area designation information acquired in the attention area designation information acquisition process (step S1 in FIG. 4), and whether the block to which the block data to be processed belongs is included in the attention area. It is determined whether or not (S22).

  If it is determined that the block is included in the region of interest (YES in S22), the data distribution unit 14 outputs the block data to be processed to the low compression unit 15B, and the low compression unit 15B A compression process is performed on the block data (S23).

  The compression unit 15 adds the compression information L to the compressed block data that is the block data that has been compressed by the low compression unit 15B (S24).

  On the other hand, if it is determined that the block is not included in the region of interest (NO in S22), the data distribution unit 14 outputs the block data to be processed to the high compression unit 15A, and the high compression unit 15A Then, compression processing is performed on the block data (S25).

  The compression unit 15 adds the compression information H to the compressed block data that is the block data that has been compressed by the high compression unit 15A (S26).

  By the compression processing described above (step S3 in FIG. 4 and FIG. 8), the block data included in the attention area 70 in the image data 60 shown in FIG. 5 is lower in compression rate than the block data not included in the attention area 70. The compression method is used. That is, the block data included in the region of interest 70 is compressed by a method that maintains visual identity with the block data before compression when decompressed. On the other hand, block data not included in the region of interest 70 is compressed so as to suppress the transmission rate when decompressed, regardless of whether or not visual identity with the block data before compression is maintained.

FIG. 9 is a flowchart showing details of the decompression process (step S7 in FIG. 4).
Referring to FIGS. 3 and 9, video receiving apparatus 20 executes the processes of steps S31 to S34 described below for each compressed block data constituting one screen (loop B).

  That is, the scheme processing unit 24 receives the compression information added to the compressed block data decoded by the decoding unit 22 from the decoding unit 22, and determines whether or not the compressed information is the compression information L (S31). ).

  If it is determined that the compression information added to the compressed block data is the compression information L (YES in S31), the method processing unit 24 sends the compression method and compression parameter indicated by the compression information L to the decompression unit 23. Is transmitted to the decompression unit 23, and the decompression unit 23 decompresses the compressed block data in accordance with the compression method and compression parameters received from the method processing unit 24 (S32).

  If it is determined that the compression information added to the compressed block data is not the compressed information L (NO in S31), the method processing unit 24 determines whether the compressed information added to the compressed block data is the compressed information H. It is determined whether or not (S33).

  When it is determined that the compression information added to the compressed block data is the compression information H (YES in S33), the method processing unit 24 sends the compression method and compression parameter indicated by the compression information H to the decompression unit 23. Is transmitted to the decompression unit 23, and the decompression unit 23 decompresses the compressed block data according to the compression method and compression parameters received from the method processing unit 24 (S34).

  After the processing of Loop B, the block synthesis unit 25 generates a part of the screen from the block data received from the decompression unit 23, and arranges a part of the generated screen in the order received from the decompression unit 23. Complete (S35).

  Image data 61 as shown in FIG. 6 is generated by the expansion processing described above (step S7 in FIG. 4, FIG. 9). That is, the block data included in the region of interest 71 in the image data 61 retains visual identity with the image data before compression in the video transmission device 10. On the other hand, the block data not included in the region of interest 71 in the image data 61 does not maintain visual identity with the block data before compression in the video transmission device 10. For example, the block data before compression is blurred. An image with reduced resolution can be obtained.

<Effect of Embodiment 1>
As described above, according to Embodiment 1 of the present invention, block data included in the attention area is compressed at a lower compression rate than block data not included in the attention area. As a result, compression processing is performed so that the data amount per unit pixel block (m × n pixels, m and n are natural numbers) in the region of interest is larger than the data amount per unit pixel block outside the region of interest. The That is, the video data subjected to the compression process so that the transmission rate per unit pixel block in the target area designated on the video receiving device 20 side is larger than the transmission rate per unit pixel block outside the target area. The video transmission device 10 can transmit to the video reception device 20. As a result, a compression process is performed to maintain the visual identity of the target area of the video data with the original video, while an area outside the target area is maintained regardless of the visual identity with the original video. In addition, the transmission rate can be kept low. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

  In addition, the user can view a high-definition video of the target area by operating the video receiving device 20 and designating the target area where visual identity is desired to be maintained. That is, when the user designates a region of interest for which high-definition video data is to be viewed with respect to the video reception device 20, the designation information is transmitted from the video reception device 20 to the video transmission device 10. The video transmission device 10 can transmit the video data after the compression processing to the video reception device 20 after performing compression processing that maintains visual identity with respect to the region of interest of the video data.

  In addition, the video reception device 20 can set a region including a target recognized by the image recognition process as a region of interest. Information for designating the region of interest is transmitted from the video receiver 20 to the video transmitter 10. The video transmission device 10 can transmit the video data after the compression processing to the video reception device 20 after performing compression processing that maintains visual identity with respect to the region of interest of the video data. For this reason, the user can view a high-definition image of the target included in the region of interest. Further, processing based on high-definition video data can be performed by the video reception device 20 or a device connected to the video reception device 20.

  In addition, the video receiving device 20 can cut out video data of the region of interest and process the cut out video data. Thereby, for example, only the video data of the region of interest can be displayed on the display device 40.

(Embodiment 2)
In the first embodiment, the transmission rate is suppressed by compressing the image data not included in the region of interest at a higher compression rate than the image data included in the region of interest. In contrast, in the second embodiment, the transmission rate is suppressed by making the frame rate of image data not included in the region of interest lower than the frame rate of image data included in the region of interest.

  The configurations of the video transmission system 1, the video transmission device 10, and the video reception device 20 according to the second embodiment are the same as those of the first embodiment.

  However, the processes executed by the video transmission device 10 and the video reception device 20 are partly different from those in the first embodiment.

  That is, the high compression unit 15A of the video transmission apparatus 10 receives the block data from the data distribution unit 14, thins out the received block data, performs a compression process similar to that of the first embodiment, and outputs the result. For example, the high compression unit 15A compresses block data of one frame per k frames (k is an integer of 2 or more), and discards the block data of the remaining (k−1) frames.

  On the other hand, as in the first embodiment, the low compression unit 15B of the video transmission device 10 performs compression processing on the block data received from the data distribution unit 14 without thinning out the frames.

  FIG. 10 is a diagram for explaining block data compression processing by the high compression unit 15A and the low compression unit 15B according to Embodiment 2 of the present invention.

  Referring to FIG. 10, the low compression unit 15B compresses the block data included in the region of interest 72 without performing frame thinning. On the other hand, the high compression unit 15A compresses the block data not included in the region of interest 72 by thinning out the frames. For example, the high compression unit 15A thins out the frame between the image data 64 and 65, and performs compression processing on the block data that is not included in the focus area 72 of each of the image data 64 and 65.

  The block synthesizing unit 25 of the video receiving device 20 generates a part of the screen from the block data received from the decompressing unit 23 and arranges the generated part of the screen in the order received from the decompressing unit 23 to complete one screen. . However, the block synthesizing unit 25 completes one screen by using the block data of the same block in the past frame as a substitute for the block in which the block data is not present due to frame thinning.

  As described above, according to the second embodiment, the transmission rate per unit pixel block outside the region of interest can be kept low by reducing the frame rate for the region outside the region of interest of the video data. Therefore, since the transmission rate can be kept low for the entire video data, real-time delivery of video data that retains the visual identity of the recognition target with the original video is possible.

(Modification)
The video reception device 20 described in the first and second embodiments decompresses the compressed block data, synthesizes block data for one screen, creates image data, and then cuts out the image data of the region of interest. However, if only the image data of the target area is required and only the image data outside the target area is unnecessary as in the case of displaying only the image data of the target area, only the block data of the necessary target area is expanded. You may make it do.

FIG. 11 is a block diagram showing a configuration of a video receiving apparatus according to a modified example of the present invention.
The video reception device 20 </ b> A can be realized by a computer in the same manner as the video reception device 20.

  However, unlike the video reception device 20, a cutout unit 26 is provided between the decoding unit 22 and the decompression unit 23.

  That is, the cutout unit 26 cuts out the compressed block data included in the region of interest determined by the region of interest determination unit 29 from the compressed block data for one screen decoded by the decoding unit 22, and compresses the compressed block data from the cut out compressed block data. The compressed block data from which the information H or the compressed information L is removed is output to the decompression unit 23 in the order of position. Further, the cutout unit 26 outputs the compression information H or the compression information L removed from the cut out compressed block data to the method processing unit 24 in the order of position.

  The method processing unit 24 acquires the compression method and compression parameters from the compression information H or the compression information L received from the cutout unit 26 and notifies the expansion unit 23 of the acquired compression method and compression parameters.

  The decompression unit 23 decompresses the compressed block data using the compression parameter notified from the method processing unit 24 in accordance with the compression method notified from the method processing unit 24. Thereby, the decompression unit 23 can decompress only the compressed block data included in the region of interest cut out by the cutout unit 26.

  The block synthesizing unit 25 generates a part of the screen from the block data received from the decompressing unit 23 and arranges the part of the generated screen in the order received from the decompressing unit 23 to complete the screen of the region of interest. The block synthesis unit 25 outputs image data indicating the screen of the completed region of interest to the display control unit 27 and the image recognition unit 28.

  When the display control unit 27 receives the image data from the block synthesis unit 25, the display control unit 27 performs control for causing the display device 40 to display the screen of the region of interest indicated by the received image data at a predetermined frame period.

  The image recognition unit 28 extracts a recognition target based on the image data of the region of interest acquired from the decompression unit 23.

  According to this modification, after the video data of the region of interest is cut out, the decompression process can be performed only on the cut out video data. That is, there is no need to perform decompression processing on video data that has not been cut out. For this reason, it is possible to reduce the memory capacity required for the decompression process provided in the video reception device 20.

(Appendix)
Although the video transmission system according to the embodiment of the present invention has been described above, the present invention is not limited to this embodiment.

  In the above-described embodiment and modification, the compression unit 15 includes the two compression units having different compression ratios including the high compression unit 15A and the low compression unit 15B. However, the compression unit 15 has different compression ratios. Three or more compression units may be provided. For example, the compression unit 15 may include an intermediate compression unit having a lower compression ratio than the high compression unit 15A and a higher compression ratio than the low compression unit 15B in addition to the high compression unit 15A and the low compression unit 15B. Good. The compression unit 15 adds the compression information M to the block data after the compression processing by the medium compression unit. Accordingly, the target area determined by the target area determining unit 29 of the video reception device 20 (20A) is the first target area to be compressed by the low compression unit 15B and the first target area to be compressed by the medium compression unit. It may be divided into two regions of interest. For example, for example, by designating a particularly important face portion of the human region as the first region of interest, the image of the face portion is compressed at a low compression rate, and the body portion that is less important than the face portion is secondly focused. By designating as a region, the image of the body part can be compressed at a medium compression rate. As a result, it is possible to maintain visual identity with the original video for important portions while reducing the amount of video data to be distributed.

  Further, some or all of the components constituting the video transmission device and the video reception device included in the video transmission system may be configured by a single semiconductor device such as a system LSI, ASIC, or FPGA. Here, the system LSI is an ultra-multifunctional LSI manufactured by integrating a plurality of components on a single chip. Specifically, the system LSI includes a microprocessor, a ROM, a RAM, and the like. System. A computer program is stored in the RAM. The system LSI achieves its functions by the microprocessor operating according to the computer program. For example, the present disclosure can be realized as Appendix 1 or Appendix 2.

<Appendix 1>
The video data received from the video transmission device, wherein the transmission rate per unit pixel block in the target area in the screen is compressed higher than the transmission rate per unit pixel block outside the target area A decompression unit for decompressing video data;
A semiconductor device comprising: a transmission unit that transmits information for designating the region of interest to the video transmission device.

<Appendix 2>
An acquisition unit for acquiring video data;
Based on the information for designating the target area in the screen of the video data received from the video receiver, the transmission rate per unit pixel block in the target area is the transmission per unit pixel block outside the target area. A semiconductor device comprising: a compression unit that performs compression processing greater than a rate on the video data acquired by the acquisition unit.

  Further, the present invention may be the method described above. Further, the present invention may be a computer program that realizes these methods by a computer.

  Furthermore, the present invention may be a computer-readable non-transitory recording medium such as an HDD, a CD-ROM, or a semiconductor memory.

Further, the computer program or the digital signal may be transmitted via an electric communication line, a wireless or wired communication line, a network represented by the Internet, a data broadcast, or the like.
Each of the above devices may be realized by a plurality of computers.

In addition, some or all of the functions of each of the above devices may be provided by cloud computing. That is, some or all of the functions of each device may be realized by the cloud server. For example, the function of the image recognition unit 28 of the video reception device 20 is realized by a cloud server, and the video reception device 20 transmits the image data extracted by the extraction unit 26 to the cloud server, and the image recognition result is received from the cloud server. The structure which acquires may be sufficient.
Furthermore, the above embodiment and the above modification examples may be combined.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the meanings described above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 1 Video transmission system 2 Monitoring object area 10 Video transmission apparatus 11 Imaging part 12 Acquisition part 13 Block division part 14 Data distribution part 15 Compression part 15A High compression part 15B Low compression part 16 Encoding part 17 Transmission part 18 Reception part 20 Video reception Device 20A Video receiving device 21 Receiving unit 22 Decoding unit 23 Decompression unit 24 Method processing unit 25 Block composition unit 26 Extraction unit 27 Display control unit 28 Image recognition unit 29 Region of interest determination unit 30 Position information acquisition unit 31 Transmission unit 40 Display device 50 network

Claims (15)

A video transmission device that acquires video data, performs compression processing on the acquired video data, and transmits the compressed video data;
A video reception device that receives the compressed video data from the video transmission device and performs a decompression process on the received video data;
The video reception device transmits information for designating a region of interest in the screen of the video data to the video transmission device,
The video transmission device, based on the information received from the video reception device, the transmission rate per unit pixel block in the region of interest is larger than the transmission rate per unit pixel block outside the region of interest. A video transmission system for performing processing on the acquired video data. The video transmission system according to claim 1, wherein the video transmission device performs the compression process on the acquired video data, in which a compression rate in the region of interest is lower than a compression rate outside the region of interest. The video transmission device includes: a block-by-block compression process for blocks in the target area among a plurality of blocks obtained by dividing the screen of the video data; a lossless compression process for video data in the target area; and a video in the target area The video transmission system according to claim 2, wherein the compression processing including at least one of non-compression processing for data is performed on the acquired video data. The said video transmission apparatus performs the said compression process with a frame rate in the said attention area higher than a frame rate outside the said attention area with respect to the acquired said video data. The video transmission system described in 1. The video transmission system according to any one of claims 1 to 4, wherein the video reception device transmits information for designating the region of interest by a user operation to the video transmission device. The video receiving apparatus performs image recognition processing for recognizing a predetermined target from the decompressed video data, and designates the target area as a target area that includes the recognized target. The video transmission system according to claim 1, wherein the information is transmitted to the video transmission device. The video transmission system according to any one of claims 1 to 6, wherein the video reception device cuts out video data of the region of interest from the video data that has been subjected to the decompression process. The video receiving device cuts out video data of the region of interest from the compressed video data, and performs the expansion processing on the cut out video data. The video transmission system described in 1. An acquisition unit for acquiring video data;
A receiving unit that receives information for designating a region of interest in a screen of the video data from a video receiving device;
Based on the information received by the reception unit, the acquisition unit acquires a compression process in which a transmission rate per unit pixel block in the region of interest is larger than a transmission rate per unit pixel block outside the region of interest. A compression unit for performing the video data;
A video transmission device comprising: a transmission unit that transmits the video data that has been subjected to the compression processing by the compression unit to the video reception device. A receiving unit that receives, from a video transmission device, video data that has been subjected to compression processing in which a transmission rate per unit pixel block in a region of interest in a screen is greater than a transmission rate per unit pixel block outside the region of interest; ,
A decompression unit for decompressing the video data received by the reception unit;
A video reception device comprising: a transmission unit that transmits information for designating the region of interest to the video transmission device. A computer program for causing a computer to function as a video transmission device,
The computer,
An acquisition unit for acquiring video data;
A receiving unit that receives information for designating a region of interest in a screen of the video data from a video receiving device;
Based on the information received by the reception unit, the acquisition unit acquires a compression process in which a transmission rate per unit pixel block in the region of interest is larger than a transmission rate per unit pixel block outside the region of interest. A compression unit for performing the video data;
A computer program that causes the video data that has been compressed by the compression unit to function as a transmission unit that transmits the video data to the video reception device. A computer program for causing a computer to function as a video receiving device,
The computer,
A receiving unit that receives, from a video transmission device, video data that has been subjected to compression processing in which a transmission rate per unit pixel block in a target area in a screen is greater than a transmission rate per unit pixel block outside the target area; ,
A decompression unit for decompressing the video data received by the reception unit;
A computer program that causes information for designating the region of interest to function as a transmission unit that transmits to the video transmission device. The video receiving device transmits information for designating the region of interest in the screen to the video transmitting device,
The video transmission device receives information for designating the region of interest from the video reception device,
The video transmission device acquires video data,
Based on the received information, the video transmission device has acquired a compression process in which a transmission rate per unit pixel block in the target area is larger than a transmission rate per unit pixel block outside the target area. For video data,
The video transmission device transmits the compressed video data to the video reception device;
The video reception device receives the compressed video data from the video transmission device;
A video delivery method in which the video receiving device decompresses the compressed video data. Get video data,
Receiving information for designating a region of interest in the screen of the video data from the video receiver;
Based on the received information, compression processing is performed on the acquired video data in which the transmission rate per unit pixel block in the region of interest is larger than the transmission rate per unit pixel block outside the region of interest. ,
A video transmission method for transmitting the compressed video data to the video receiver. From the video transmission device, receives video data subjected to compression processing in which the transmission rate per unit pixel block in the target area in the screen is larger than the transmission rate per unit pixel block outside the target area,
Decompress the received video data,
A video reception method for transmitting information for designating the region of interest to the video transmission device.

Images