JP5853142B2 - Video transmission system - Google Patents

Video transmission system Download PDF

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JP5853142B2
JP5853142B2 JP2011012328A JP2011012328A JP5853142B2 JP 5853142 B2 JP5853142 B2 JP 5853142B2 JP 2011012328 A JP2011012328 A JP 2011012328A JP 2011012328 A JP2011012328 A JP 2011012328A JP 5853142 B2 JP5853142 B2 JP 5853142B2
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frame data
unit
compression
moving image
data
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JP2012156652A (en
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一彦 五所野尾
一彦 五所野尾
享 伊藤
享 伊藤
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パナソニックIpマネジメント株式会社
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Description

  The present invention relates to a moving image transmission system, and more particularly to a moving image transmission system that transmits a moving image in real time.

  2. Description of the Related Art Conventionally, in moving image transmission systems that transmit moving images in real time, moving image data is generally compressed to reduce the data size. In order to reduce the data size of the frame data, it has been proposed to use a difference from other frame data. As such, there is one using an I picture (intra-frame encoded image) and a P picture (forward prediction encoded image). Here, the I picture is obtained by compressing frame data into a form that can be independently decompressed without any dependency on other frame data. A P picture is obtained by compressing frame data into a form represented by a difference from a previous frame in time series.

  A compression method similar to the compression method described above is employed in MPEG-2 and the like. Unlike an I picture, a P picture cannot be expanded independently, but the data size can be significantly reduced compared to an I picture. Therefore, if the first frame data of moving image data is compressed into an I picture and the subsequent frame data is compressed into a P picture, the data size can be made very small.

  By the way, when decompressing a P picture, it is necessary to refer to the previous frame data. Therefore, when an image is deteriorated due to packet loss or the like, the influence of such deterioration affects all subsequent frame data, and the quality of the displayed moving image is deteriorated. Therefore, a method of suppressing image degradation by periodically compressing and transmitting frame data to an I picture is employed. However, since I pictures are periodically transmitted, relatively large data is periodically transmitted. Will be transmitted. Also, when the frequency band that can be used for moving image data transmission is relatively narrow, it takes a long time to transmit the I picture. Therefore, there is a possibility that a delay occurs in the moving image being displayed.

  As a solution to this, Patent Document 1 discloses a method of dividing frame data into a plurality of divided frame data and compressing at least one of the plurality of divided frame data divided from the same frame data into a P picture. Has been. In the one described in Patent Document 1, the data size after compression of a plurality of frame data included in moving image data can be averaged, and the entire frame data is compressed into a reference picture such as an I picture. It can be set to a smaller value. Therefore, even when the frequency band that can be used for moving image data transmission is narrow, it is not necessary to reduce the compression data rate, frame rate, and number of colors, and it is possible to transmit moving images without degrading the quality. .

JP 2010-081140 A

  However, in the above conventional example, the average value of the data size can be reduced by averaging the data size after compression, but there is a problem that the effect of reducing the transmission amount of necessary data as a whole cannot be expected. It was. For this reason, in the conventional example, relatively large data is transmitted as in the case of regularly transmitting I pictures.

  The present invention has been made in view of the above points, and provides a moving picture transmission system capable of reducing the average value of the data size and reducing the data transmission amount while suppressing deterioration of the quality of the moving picture. The purpose is to do.

The moving image transmission system of the present invention includes a transmitting device and a receiving device that transmit and receive moving image data, and the transmitting device compresses the first frame data among a plurality of time-series frame data included in the moving image data into a reference picture. And a first compression process for compressing the remaining frame data into a differential picture consisting of a difference from other frame data at a constant cycle; and the plurality of frame data at a cycle longer than the fixed cycle. Each of the first compression processing and the second compression processing is received, and the reception device receives the data obtained in each of the first compression processing and the second compression processing, and obtains the data by the first compression processing. A parameter for evaluating the quality of the moving image by analyzing the data and when the parameter falls below a threshold value, Referring to the data obtained by the compression process, characterized in that extension.

In the moving image transmission system, the transmission device compresses moving image data by compressing each of a plurality of time-series frame data included in the moving image data obtained by the input unit and moving image data obtained by the input unit. The first compression unit and the second compression unit that perform compression, and the compressed frame data compressed by each compression unit are transmitted to the reception device in time series, and the command signal transmitted from the reception device is received. and a transceiver for, each compression unit, said a first compression process, and executes each said second compression, the receiving apparatus, the compressed frame data transmitted from the transmitting device And transmitting / receiving the command signal to the transmitting device, and the moving image data compressed by decompressing the compressed frame data obtained by the first compression processing. Determining a decompression unit for performing the extension, and a display unit for displaying the decompressed moving picture data, a parameter for analyzing the compressed frame data obtained by the first compression process to evaluate the quality of a moving image The analysis unit, and when the parameter falls below a threshold value in the analysis unit, the reception device transmits the command signal requesting to switch compression processing in each compression unit to the transmission device, and It is preferable to decompress the frame data with reference to the compressed frame data obtained by the second compression process.

  In this moving image transmission system, it is preferable that the analysis unit analyzes based on color information of frame data obtained by decompressing the compressed frame data.

  In this moving image transmission system, it is preferable that the analysis unit analyzes based on luminance information of frame data obtained by decompressing the compressed frame data.

  In the moving image transmission system, it is preferable that the analysis unit performs analysis based on a data size of the compressed frame data.

  The present invention has an effect that the average value of the data size can be reduced while the deterioration of the quality of the moving image is suppressed, and the data transmission amount can be reduced.

It is a block diagram of an intercom system to which an embodiment of a moving picture transmission system according to the present invention is applied. (A)-(c) is explanatory drawing when the analysis part does not determine with the quality of the moving image having deteriorated in the intercom system same as the above. (A)-(c) is explanatory drawing when the analysis part determines with the quality of a moving image having deteriorated in the intercom system same as the above. (A)-(c) is explanatory drawing of the conventional compression method.

  Hereinafter, an embodiment of a moving picture transmission system according to the present invention will be described based on an example applied to a security intercom system (hereinafter simply referred to as “interphone system”).

  As shown in FIG. 1, this intercom system includes an imaging device 1 installed at the eaves of a house, a display device 2 composed of a master unit (interphone master unit) installed inside the house (indoor), and outside the house ( It is comprised with the subunit | mobile_unit (interphone subunit | mobile_unit) not shown installed in the outdoors. Note that the imaging device 1 and the slave unit are connected to the display device 2 by a transmission line. Moreover, since a conventionally well-known thing can be employ | adopted for a subunit | mobile_unit, detailed description of a subunit | mobile_unit is abbreviate | omitted.

  The imaging device 1 is a transmission device that transmits moving image data, and includes an input unit 10, a storage unit 11, a first compression unit 12, a second compression unit 13, a processing unit 14, and a transmission / reception unit 15. As main components.

  The input unit 10 is an imaging unit having a function of imaging a predetermined imaging region, for example, and includes an imaging device (not shown) made of a solid-state imaging device such as a CCD image sensor or a CMOS image sensor. In addition, the input unit 10 includes a control device (not shown) such as a DSP (Digital Signal Processor) that performs a function as a camera together with the imaging device as a main component. When a CMOS image sensor is used as the image sensor, a one-chip camera in which the image sensor and the control device are integrally configured using system-on-chip (SoC) technology or the like is used as the input unit 10. You can also.

  The control device of the input unit 10 captures the output (charge) of the image sensor at a predetermined frame rate (for example, 30 fps). Then, the control device creates and outputs still image data such as digital data in a predetermined format (for example, YUV format), for example, RAW data, based on the captured output of the image sensor. In this way, still image data representing the image of the imaging region is sequentially output from the control device. Therefore, moving image data representing moving images (moving images) in the imaging region can be obtained by the input unit 10. The moving image data obtained from the input unit 10 is composed of a plurality of still image data in time-series order. In the following description, still-image data in time-series order constituting the moving image data (that is, one frame of the moving image data) Hit data) is called frame data.

  The storage unit 11 is a rewritable storage device (storage device) such as a flash memory, SDRAM, or SRAM, and is mainly used for storage (storage) of moving image data obtained by the input unit 10.

  The compression units 12 and 13 compress moving image data in order to transmit the moving image data obtained by the input unit 10 to the display device 2. Each compression part 12 and 13 consists of microcomputers, for example, and performs the following compression process by running the program memorize | stored in memory. In addition to the microcomputer, a dedicated ASIC (Application Specific Integrated Circuit), FPGA (Field Programmable Gate Array), DSP, or the like can be used for each of the compression units 12 and 13. Of course, each of the compression units 12 and 13 may be constituted by one microcomputer or the like. The compression of the moving image data is performed by compressing each of a plurality of time-sequential frame data constituting the moving image data. Each of the compression units 12 and 13 creates compressed frame data by executing one of the first compression process and the second compression process on the frame data. The compression units 12 and 13 simultaneously perform different compression processes. For example, when the first compression unit 12 is performing the first compression process, the second compression unit 13 performs the second compression process, and vice versa.

  In the first compression processing, first, the first frame data is image-compressed (encoded) into a reference picture such as an I picture (intra-frame encoded image). The reference picture is a still image compressed image that is independent of other frame data and can be expanded independently. As a compression method to the reference picture, a conventionally well-known method (for example, a still image compression method for obtaining JPEG, I picture, or the like) can be adopted, and detailed description thereof is omitted here. Next, in the first compression process, the subsequent frame data is image-compressed into a differential picture such as a P picture (forward prediction encoded image). The difference picture is a compressed moving image obtained from a difference from other frame data. Note that a conventionally known method (for example, a moving image compression method for obtaining a P picture) can be employed as a compression method to a differential picture, and thus detailed description thereof is omitted here.

  The second compression process is a process for compressing the frame data into only the reference picture. As will be described later, the compressed frame data compressed by the second compression processing is transmitted to the display device 2 at a cycle T2 longer than the fixed cycle T1 for transmitting the compressed frame data compressed by the first compression processing. Is done. Therefore, in the second compression process, unlike the first compression process, the compression process is not performed on all frame data, but is performed with a certain interval (see FIG. 2C). .

  For example, the processing unit 14 performs a storage process in which a management identification code (for example, a frame number) is attached to the frame data of the moving image data sequentially output by the input unit 10 and stored in the storage unit 11. Further, the processing unit 14 determines whether or not an object (a person in this embodiment) is captured in a frame based on the frame data of the input unit 10 at a predetermined time interval (that is, a person is within the imaging range of the input unit 10). A detection process for determining whether or not it exists is executed. Such detection processing can be realized by performing image processing on the frame data obtained from the input unit 10. For example, a face authentication process is performed on the input frame data to detect the position of a human face on the entire screen area. In addition, since various methods are conventionally provided for such detection processing, detailed description thereof is omitted. When the processing unit 14 detects an object in the detection process, the processing unit 14 performs a transmission process of transmitting moving image data obtained from the input unit 10 to the display device 2 within a predetermined period including the detection time of the target. In the transmission process, the compression units 12 and 13 start to compress moving image data, and the transmission / reception unit 15 starts transmission of moving image data. For example, a microcomputer is used as the processing unit 14.

  The transmission / reception unit 15 is a communication unit for transmitting the moving image data (compressed moving image data) compressed by the compression units 12 and 13 to the display device 2, and encodes the compressed moving image data (transmission path encoding). Output to the display device 2. Such a transmission / reception unit 15 transmits the compressed moving image data in real time by transmitting the compressed frame data created by the compression units 12 and 13 in chronological order. The transmission / reception unit 15 also has a function as a reception unit that receives a command signal including a switching request command (described later) transmitted from the display device 2 and gives the command signal to the processing unit 14.

  The transmission / reception unit 15 transmits the compressed frame data created by the compression units 12 and 13 to the display device 2 at different periods. That is, the transmission / reception unit 15 transmits the compressed frame data from the compression unit that executes the first compression process among the compression units 12 and 13 at a constant period T1 and from the compression unit that executes the second compression process. The compressed frame data is transmitted at a cycle T2 (T2> T1). Therefore, since the compressed frame data from the compression unit that executes the second compression process is transmitted at a lower bit rate than the compressed frame data from the compression unit that executes the first compression process, the transmission load increases. Can be suppressed.

  The display device 2 is a receiving device having a function of receiving and displaying moving image data transmitted from the imaging device 1. Such a display device 2 includes a transmission / reception unit 20, a storage unit 21, an expansion unit 22, a display unit 23, a processing unit 24, and an analysis unit 25 as main components.

  The transmission / reception unit 20 is a communication unit for receiving the moving image data transmitted from the imaging device 1, and sequentially decodes the signal including the compressed moving image data transmitted from the transmission / reception unit 15 (transmission path decoding). Execute the output process. The transmission / reception unit 20 also has a function as a transmission unit that transmits a command signal including a switching request command described later generated by the analysis unit 25 to the imaging device 1.

  Similar to the storage unit 11, the storage unit 21 is a rewritable storage device such as a flash memory, SDRAM, or SRAM, and is mainly used for storing (storing) compressed moving image data received by the transmission / reception unit 20.

  The decompression unit 22 is for decompressing the compressed moving image data received by the transmission / reception unit 20, and decompresses the compressed moving image data by decompressing each compressed frame data. Here, the decompression unit 22 decompresses the compressed moving image data compressed by the first compression processing in the imaging apparatus 1. Note that, similarly to the compression unit 12, the decompression unit 22 can include a microcomputer, an ASIC, an FPGA, a DSP, and the like as main components.

  The display unit 23 includes a display device (not shown) such as a liquid crystal display device (LCD) or a CRT. The display unit 23 displays the moving image data (reproduces the moving image) by displaying the compressed frame data expanded by the expansion unit 22, that is, the frames based on the frame data in time series order.

  For example, the processing unit 24 performs a recording process of recording the compressed moving image data received by the transmission / reception unit 20 in the storage unit 21. In addition, when the transmission / reception unit 20 receives the compressed moving image data, the processing unit 24 executes display processing for displaying the compressed moving image data on the display unit 23. In this display process, the decompression unit 22 starts decompressing the compressed moving image data, and the display unit 23 starts displaying the moving image data. Such a processing unit 24 uses a microcomputer in the same manner as the processing unit 14.

  The analysis unit 25 analyzes the frame data decompressed by the decompression unit 22 to obtain a parameter for evaluating the quality of the moving image, and executes a process of comparing the parameter with a preset threshold value To do. When the parameter is below the threshold, the analysis unit 25 determines that the quality of the frame data is deteriorated and the video is disturbed, that is, the quality of the moving image is deteriorated. Then, the analysis unit 25 generates a switching request command that requests the imaging apparatus 1 to switch the compression processing in each of the compression units 12 and 13. The generated switching request command is transmitted from the transmission / reception unit 20 to the imaging device 1 as a command signal.

  Hereinafter, the operation of this embodiment will be described. In the following description, an I picture is used as a reference picture, and a P picture is used as a difference picture. In the following description, it is assumed that the first compression unit 12 initially executes the first compression process, and the second compression unit 13 executes the second compression process.

  While the imaging apparatus 1 is activated, the imaging unit 1 always captures a predetermined imaging area with a predetermined frame rate by the input unit 10. The frame data captured by the input unit 10 is sequentially stored in the storage unit 11 by the processing unit 14. The processing unit 14 performs the above-described detection process based on the frame data obtained from the input unit 10. As a result of the detection process, when it is determined that the object is captured, the processing unit 14 causes the compression units 12 and 13 to start compressing the moving image data and causes the transmission / reception unit 15 to start transmitting the moving image data. .

  Here, the first compression unit 12 compresses the frame data to be transmitted first into an I picture and compresses the frame data to be transmitted thereafter into a P picture. Therefore, the compressed frame data I1 compressed into an I picture is first transmitted to the display device 2, and then the compressed frame data P1 to P7 compressed into a P picture are sequentially transmitted to the display device 2 at a constant cycle T1. It is transmitted (see FIGS. 2A and 2C). Also, the second compression unit 13 compresses the frame data to be transmitted into an I picture with a certain interval. Therefore, the compressed frame data I2 to I4 compressed into an I picture are transmitted to the display device 2 in the time series in the time series (see FIG. 2C).

  In the display device 2, the compressed moving image data is received by the transmission / reception unit 20. Then, the compressed moving image data is recorded in the storage unit 21 by the processing unit 24. Further, the processing unit 24 causes the decompressing unit 22 to start decompressing the compressed moving image data from the first compressing unit 12 and causes the display unit 23 to start displaying the decompressed moving image data, that is, the moving image data. The decompression unit 22 first decompresses the compressed frame data I1 alone and causes the display unit 23 to display the decompressed frame data A1. The processing unit 24 expands the subsequent compressed frame data P1 to P7 to frame data A2 to A8 with reference to the immediately preceding frame data A1 to A7, and displays the expanded frame data A2 to A8 in time series order. 23 (see FIG. 2B).

  In this way, only the frame data to be transmitted first is image-compressed into an I picture, and the frame data to be transmitted thereafter is image-compressed into a P picture, so that the data transmission amount can be reduced as a whole. That is, the total data size of the compressed frame data to be transmitted can be reduced as compared with the case where the frame data is periodically compressed into an I picture and transmitted (see FIGS. 4A to 4C). it can. The frame data to be transmitted first is compressed into an I picture, but the other frame data is compressed into a P picture, so that the average data size can be reduced (see FIG. 2C).

  By the way, since the reproduction of a moving image using a P picture is based on the premise that the immediately preceding frame data is referred to, there is a possibility that the quality of the displayed moving image is deteriorated when the movement of the object becomes intense. Therefore, the processing unit 24 causes the decompression unit 22 and the display unit 23 to execute the above processing, and causes the analysis unit 25 to analyze the moving image data.

  The analysis unit 25 obtains a parameter from the previous frame data and the current frame data among the decompressed frame data A1 to A8, for example, by calculating a color component dispersion or frequency distribution, and the parameter is set in advance. Compare with the threshold value. Note that the threshold value is obtained experimentally based on the quality of a moving image that is allowed to be viewed from the human eye by, for example, reproducing the moving image in a state where an object is actually present. When the parameter falls below the threshold, the analysis unit 25 determines that the quality of the moving image has deteriorated and generates a switching request command. This switching request command is transmitted from the transmission / reception unit 20 to the imaging apparatus 1 as a command signal.

  In the imaging apparatus 1, when the transmission / reception unit 15 receives the command signal, the processing unit 14 interprets the switching request command included in the command signal. The processing unit 14 switches the compression processing executed by the compression units 12 and 13 by interpreting the switching request command. That is, the processing unit 14 causes the first compression unit 12 to execute the second compression process, and causes the second compression unit 13 to execute the first compression process. Therefore, after receiving the command signal, the first compression unit 12 compresses the frame data into an I picture at a cycle T2, and the second compression unit 13 compresses the frame data into a P picture at a constant cycle T1. In the first compression process after receiving the command signal, the compression process for compressing the first frame data into an I picture is not executed.

  On the other hand, in the processing unit 24 of the display device 2, after the transmission / reception unit 20 transmits a command signal, the compressed moving image data to be expanded by the expansion unit 22 is switched. That is, the processing unit 24 causes the decompression unit 22 to start decompressing the compressed moving image data from the second compression unit 13. Here, the second compression unit 13 executes a compression process for compressing the frame data into an I picture before receiving the command signal. Therefore, the decompression unit 22 can refer to the I picture received immediately before the command signal is transmitted after the command signal is transmitted. Thereafter, as described above, the second compression unit 13 executes a compression process for compressing the frame data into a P picture, so that the decompression unit 22 refers to the I picture received immediately before the command signal is transmitted. The P picture obtained from the second compression unit 13 is expanded.

  Note that the first compression unit 12 compresses the frame data into an I picture at a cycle T2 by executing a second compression process after receiving the command signal. Therefore, when the next video disturbance occurs, the compression processing executed by the compression units 12 and 13 is switched and the same processing as described above is executed. It can be expanded with reference to the I picture.

  For example, as illustrated in FIGS. 3A to 3C, the analysis unit 25 determines that the video is disturbed (deterioration of moving image quality) at the time when the expanded frame data A3 is displayed on the display unit 23. After that, it is assumed that the transmission / reception unit 15 of the imaging device 1 receives the command signal. In this case, the display device 2 has not completed the reception of the compressed frame data I2 from the second compression unit 13 received before the transmission of the command signal. Therefore, the imaging apparatus 1 completes reception of the compressed frame data I2 in the display apparatus 2 by increasing the transmission speed and transmitting the compressed frame data I2. Moreover, in the imaging device 1, since the 2nd compression part 13 performs a 1st compression process after receiving a command signal, the compression frame data P3-P7 obtained by the said compression process are sequentially with respect to the display apparatus 2. Sent. The decompressing unit 22 of the display device 2 decompresses the compressed frame data P3 with reference to the received compressed frame data I2, and sequentially decompresses the subsequent compressed frame data P4 to P7 with reference to the immediately preceding frame data. As described above, since the frame data displayed after the transmission of the command signal is obtained by expanding the compressed frame data P3 with reference to the compressed frame data I2 transmitted from the imaging device 1, the quality of the moving image is improved again. As a result, it is possible to suppress the deterioration of the quality of the moving image.

  As described above, only the frame data to be transmitted first is compressed into an I picture (reference picture), and the other frame data is compressed into a P picture (difference picture). Therefore, the average value of the data size is reduced, and The amount of data transmission can be reduced. If the analysis unit 25 analyzes the quality of the moving image to be reproduced and determines that the quality of the moving image has deteriorated, the compressed frame data can be expanded with reference to the I picture obtained by the second compression processing. , Degradation of the quality of the moving image can be suppressed. Furthermore, the time required to restore the quality of the moving image can be shortened as compared with the case where the compression units 12 and 13 again compress the frame data into an I picture after the quality of the moving image has deteriorated. .

  By the way, the analysis unit 25 of the present embodiment obtains parameters by calculating the dispersion and frequency distribution of color components, that is, analyzes based on the color information of the expanded frame data. For this reason, in the present embodiment, it is possible to detect the disturbance of the video accompanying the color change. On the other hand, the analysis unit 25 may obtain the parameters by calculating the variance of the luminance component and the frequency distribution from the previous frame data and the current frame data among the expanded frame data. That is, the analysis unit 25 may perform analysis based on the luminance information of the expanded frame data. In this case, similarly to the case of analyzing based on the color information, it is possible to detect the disturbance of the video accompanying the color change. In addition, since the luminance component is a component that tends to feel uncomfortable for humans, it is possible to determine the deterioration of the quality of the moving image at a level close to the human experience.

  Further, the analysis unit 25 may obtain a parameter by calculating the data size of the compressed frame data obtained by the first compression processing, that is, the analysis may be performed based on the data size of the compressed frame data. In this case, since the deterioration of the quality of the moving image can be determined by a one-dimensional number such as the data size, the analysis unit 25 is configured by software with a small processing load or hardware with a small circuit scale (a small number of gates required for processing). Can be configured. Therefore, costs can be reduced as compared with the case of analyzing based on color information and luminance information. As described above, the analysis unit 25 may be configured to analyze based on the compressed frame data, or may be configured to analyze the compressed frame data based on the decompressed frame data.

  The above-described configuration of the moving image transmission system of the present embodiment is merely an embodiment of the present invention, and is not intended to limit the technical scope of the present invention to the above example, and does not depart from the spirit of the present invention. Can be changed to a degree. For example, in the above example, a P picture is adopted as the differential picture, but a B picture (bidirectional predictive coded image) may be used instead of or together with the P picture.

  In the present embodiment, the processing unit 14 of the imaging device 1 executes a detection process, and when an object is detected by the detection process, transmission of moving image data is started. However, transmission of moving image data may be started when moving image data is obtained from the imaging apparatus 1 regardless of the presence or absence of an object. That is, the timing for starting transmission of moving image data can be appropriately set according to the purpose of use of the moving image transmission system.

  In the present embodiment, the imaging device 1 and the display device 2 constitute the moving image transmission system of the present invention. Here, in the interphone system, since a device with a camera is often used as the slave unit, such a slave unit with a camera and the display device 2 may constitute the moving picture transmission system of the present invention. In this case, the slave unit is a transmission device, and the display device 2 is a reception device.

  In this embodiment, the moving image transmission system of the present invention is applied to an intercom system. However, the moving image transmission system of the present invention can also be applied to a system such as a monitoring system. That is, the moving image transmission system of the present invention is applicable as long as moving image data is transmitted in real time.

1 Imaging device (transmitting device)
DESCRIPTION OF SYMBOLS 10 Input part 12 1st compression part 13 2nd compression part 15 Transmission / reception part 2 Display apparatus (reception apparatus)
20 transmitting / receiving unit 22 decompressing unit 23 display unit 25 analyzing unit A1 to A8 frame data I1 to I4 I picture (reference picture)
P1 to P7 P picture (difference picture)

Claims (5)

  1. A transmitter and a receiver for transmitting and receiving moving image data;
    The transmitting device compresses the first frame data among a plurality of time-series frame data included in the moving image data into a reference picture, and converts the remaining frame data into a differential picture that is a difference from other frame data. Performing a first compression process for compressing at a constant period and a second compression process for compressing the plurality of frame data into the reference picture at a period longer than the constant period ;
    The receiving device receives data obtained by each of the first compression processing and the second compression processing, decompresses the data obtained by the first compression processing, analyzes the data, and analyzes a moving image. A video transmission system characterized in that a parameter for evaluating the quality of an image is obtained, and when the parameter falls below a threshold value, the image is decompressed with reference to the data obtained by the second compression processing.
  2. The transmission apparatus includes: an input unit for obtaining moving image data; and a first compression unit that compresses moving image data by compressing each of a plurality of time-series frame data included in the moving image data obtained by the input unit. A compression unit and a second compression unit; and a transmission / reception unit that transmits the compressed frame data compressed by each compression unit to the reception device in time series and receives a command signal transmitted from the reception device. And
    Wherein each compression unit includes a first compression process, and the second compression process executed respectively,
    The receiving device receives the compressed frame data transmitted from the transmitting device, and expands the compressed frame data obtained by the first compression processing, and a transmitting / receiving unit that transmits the command signal to the transmitting device a decompression unit for performing decompression of the video data compressed by a display unit for displaying the decompressed moving picture data, the moving image by analyzing the compressed frame data obtained by the first compression An analysis unit for obtaining parameters for evaluating quality,
    When the parameter falls below a threshold value in the analysis unit, the reception device transmits the command signal for requesting to switch the compression processing in each compression unit to the transmission device, and obtains the command signal in the second compression processing. 2. The moving picture transmission system according to claim 1, wherein the compressed frame data is decompressed with reference to the compressed frame data.
  3.   The moving image transmission system according to claim 2, wherein the analysis unit analyzes the compressed frame data based on color information of decompressed frame data.
  4.   The moving image transmission system according to claim 2, wherein the analysis unit analyzes the compressed frame data based on luminance information of decompressed frame data.
  5.   The moving image transmission system according to claim 2, wherein the analysis unit analyzes based on a data size of the compressed frame data.
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