JPWO2008123125A1 - Image quality evaluation system, method and program - Google Patents

Abstract

Reliability of image quality evaluation performed on a terminal that receives an image is determined on an image transmission apparatus. A receiving terminal transmits the image quality evaluation result of a received image performed on the receiving terminal to the image transmitting apparatus side, and simultaneously transmits the received image to the image transmitting apparatus at a predetermined time interval. In the image transmission device, the image quality of the received image frame is evaluated by comparing the received image frame sent from the receiving terminal at a predetermined time interval with the original image frame before transmission. Evaluate the reliability of the image quality evaluation results. [Selection] Figure 1

Description

  The present invention relates to an image quality evaluation system, method, and program, and more particularly to an image quality evaluation system, method, and program for evaluating image quality at the time of reception of transmitted video data.

Conventionally, regarding this type of technology, as described in ITU-T Recommendation J.143 (Non-Patent Document 1), methods for objectively evaluating the image quality of video data are roughly classified into three types. The first method is to directly compare the original image and the degraded image to evaluate the image quality (Full Reference method), and the second is to transmit only the feature quantity of the original image and evaluate the image quality from this feature quantity and the degraded image. (Reduced Reference Method), and the third is a method (No Reference Method) for evaluating image quality only from a degraded image. In an application involving transmission of video data, the transmission path band has an upper limit, and transmission of an original image is impossible, so the Full Reference method cannot be used on the receiving terminal side. Therefore, the receiving terminal side performs image quality evaluation using the Reduced Reference method or the No Reference method, but the image sending apparatus side knows whether the image quality evaluation result measured on the image receiving terminal side is reliable. There was a problem that I could not. A technique for solving this problem is disclosed in Patent Document 1. In the image quality evaluation apparatus described in Patent Document 1, packet loss information of received video data and an error concealment method when an error occurs are transmitted to the image transmission apparatus, and the received video is reproduced on the image transmission apparatus side to transmit the image. The above problem is solved by performing image quality evaluation on the apparatus.
ITU-T Recommendation J.143 (especially PP.4-5) JP 2006-157223 A

  In the image quality evaluation apparatus described in Patent Document 1, since the image quality is always evaluated on the image transmission apparatus side, there is a problem that the load on the image transmission apparatus side becomes high.

  The present invention has been proposed in view of the above-described problems, and an object of the present invention is to evaluate the image quality of video data (hereinafter referred to as received video data) received by an image receiving terminal on the image sending device side. An object of the present invention is to provide an image quality evaluation system, method, and program thereof that can reduce the load on the image transmission apparatus.

  In addition, the present invention provides an image quality evaluation system, method, and program for performing image quality evaluation on an image receiving terminal that has received video data and making it possible to determine the reliability of the evaluation result on an image transmission apparatus. There is to do.

  The present invention for solving the above problems is an image quality evaluation system in which an image receiving device receives video data sent from an image sending device and evaluates the image quality of the video data, and the image receiving device receives the received video. Data is decoded, and the decoded received video data is transmitted to an image sending device at a predetermined time interval, and the image output device performs image quality evaluation using the received video data. This is an image quality evaluation system.

  Further, the present invention for solving the above problems is an image quality evaluation system in which an image receiving device receives video data sent from an image sending device and evaluates the image quality of the video data, the image receiving device receiving the image data The received video data is decoded at a predetermined time interval, and the decoded received video data and the image quality evaluation result obtained by evaluating the image quality of the received video data are transmitted to the image sending device, and the image The output device is an image quality evaluation system that performs image quality evaluation of the received video data using the received video data and the image quality evaluation result.

  In addition, the present invention for solving the above-mentioned problems is an image quality evaluation system in which an image receiving apparatus receives encoded video data transmitted from an image transmitting apparatus via a network and evaluates the image quality of the received video data. The image receiving apparatus receives video data encoded via a network, performs image quality evaluation of the received video data, and an image decoding processing unit that decodes the video data, and performs image quality evaluation. An image quality evaluation processing unit for transmitting the result; and a received image encoding processing unit for encoding an arbitrary video frame of the received video data decoded by the image decoding processing unit and transmitting the video frame at a predetermined time interval. And the image sending device receives the image quality evaluation result and the video frame via a network and decodes the encoded video frame. And an image quality evaluation reliability determination unit that evaluates the reliability of the image quality evaluation result of the image receiving device by comparing the decoded video frame and the image quality evaluation result. It is the image quality evaluation system characterized by being performed.

  In addition, the present invention for solving the above-mentioned problems is an image quality evaluation system in which an image receiving apparatus receives encoded video data transmitted from an image transmitting apparatus via a network and evaluates the image quality of the received video data. An image sending device for receiving the video data received by the image receiving device from the image receiving device and the image quality evaluation result of the video data received by the image receiving device, and the video data Image transmission of an image quality evaluation system comprising an image quality evaluation reliability determination unit that evaluates the reliability of the image quality evaluation result of the image receiving device by comparing with the image quality evaluation result Device.

  In addition, the present invention for solving the above-mentioned problems is an image quality evaluation system in which an image receiving apparatus receives encoded video data transmitted from an image transmitting apparatus via a network and evaluates the image quality of the received video data. An image receiving apparatus for performing image quality evaluation of received video data, sending an image quality evaluation result to the image transmitting apparatus, and encoding an arbitrary video frame of the decoded received video data The image receiving apparatus for the image quality evaluation system includes a received image encoding processing unit that transmits the image to the image transmitting apparatus at predetermined time intervals.

  In addition, the present invention for solving the above-described problem is an image quality evaluation method in which an image reception device receives video data transmitted from an image transmission device and evaluates the image quality of the video data, and the image reception device receives the image data. The decoded video data is decoded, and the decoded received video data is transmitted to the image transmission device at a predetermined time interval, and the image output device performs image quality evaluation using the received video data. Is an image quality evaluation method.

  In addition, the present invention for solving the above-described problem is an image quality evaluation method in which an image reception device receives video data transmitted from an image transmission device and evaluates the image quality of the video data, and the image reception device receives the image data. The received video data is decoded at a predetermined time interval, and the decoded received video data and the image quality evaluation result obtained by evaluating the image quality of the received video data are transmitted to the image sending device, and the image The output device is an image quality evaluation method that performs image quality evaluation of the received video data using the received video data and the image quality evaluation result.

  Further, the present invention for solving the above problems is an image quality evaluation program for receiving video data sent from an image sending device and evaluating the image quality of the video data, wherein the image receiving device receives the image data. The received image data is decoded at a predetermined time interval, and the received image data is transmitted to the image sending device. The image output device performs image quality evaluation using the received image data. It is an image quality evaluation program characterized in that it functions as it does.

  Further, the present invention for solving the above problems is an image quality evaluation program for receiving video data sent from an image sending device and evaluating the image quality of the video data, wherein the image receiving device receives the image data. A function of decoding the received video data and transmitting the decoded received video data and an image quality evaluation result obtained by evaluating the image quality of the received video data to the image transmission device at a predetermined time interval. And the image output device functions to perform image quality evaluation of the received video data using the received video data and the image quality evaluation result.

  An advantage of the present invention is that the reliability of the image quality evaluation result on the terminal that has received the video data can be determined with a low load on the image transmission apparatus.

  The reason is that the received video data input to the image sending device is sent from the image receiving terminal at a predetermined time interval. Further, the image quality evaluation is performed on the image receiving terminal side to reduce the load on the image transmission device, and the image transmission device side also performs the image quality evaluation at a predetermined time interval. Also, by comparing this evaluation result with the image quality evaluation result performed on the image receiving terminal side, the image transmission apparatus side can grasp the reliability of the image quality evaluation result on the receiving terminal side.

It is a block diagram which shows the structure of the 1st Embodiment of this invention. It is a block diagram which shows the structure of the 2nd Embodiment of this invention. It is a figure which shows the operation | movement of the 3rd Embodiment of this invention. It is a figure which shows the operation | movement of the 3rd Embodiment of this invention. It is a block diagram which shows an image transmission system among the computer systems which are the 4th Embodiment of this invention. It is a block diagram which shows an image receiving system among the computer systems which are the 4th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Image encoding process part 102 Image quality evaluation result totaling process part 103 Image decoding process part 104 Image quality value reliability determination process part 301 Image decoding process part 302 Image quality evaluation process part 303 Reception image encoding process part 401 Image encoding process Unit 402 image quality evaluation result totaling processing unit 403 image decoding processing unit 404 image quality value reliability determination processing unit 405 image quality evaluation result accumulation processing unit 501 image decoding processing unit 502 image quality evaluation processing unit 503 received image encoding processing unit 504 received image Data storage processing unit 51 Program control processor 52 Input data buffer 53 Output data buffer 54 Program memory 55 Image encoding process 56 Image quality evaluation result totaling process 57 Image decoding process 58 Quality value reliability determination process 61 Program control processor 62 Input data buffer 63 Output data Buffer 64 program memory 65 the image decoding process 66 image quality evaluation processing 67 receives the image coding process

  The image quality evaluation system of the present invention performs image quality evaluation by sending received video data to the image sending device side at predetermined time intervals. Therefore, it is possible to perform image quality evaluation with a reduced load on the image transmission apparatus.

  In addition, the image quality evaluation is performed on the image receiving terminal, thereby reducing the burden on the image sending apparatus side. At this time, the image transmission device side performs image quality evaluation at predetermined time intervals, and the image transmission device side performs image quality evaluation from the image quality evaluation value and the received video data transmitted from the image receiving terminal. Even in such a case, it is possible to perform image quality evaluation with a reduced load on the image transmission apparatus.

  The received video data sent from the image receiving terminal to the image sending device may be a video frame. Video frames are transmitted after being compressed using, for example, the JPEG method because of the limitation of network bandwidth, but compression is performed at a compression rate that does not impair the image quality at the time of reception. Encoding may be used. On the image sending device side, the image quality of the video frame is evaluated by comparing the video frame sent from the receiving terminal at a predetermined time interval with the original image frame before sending, and sent separately from the receiving terminal. Evaluate the reliability of the image quality evaluation results.

  Hereinafter, embodiments of the present invention will be described.

(First embodiment)
Next, the operation of the image quality evaluation system of the present invention will be described in detail with reference to FIG.

  Referring to FIG. 1, the image quality evaluation system according to the present invention includes an image sending device 1, a transmission path 2, and an image receiving device 3. The image sending device 1 encodes an input image and uses it as video data, an image coding processing unit 101, an image quality evaluation totaling processing unit 102 for totaling image quality evaluation results sent from the image receiving device 3, and an image receiving device 3 includes an image decoding processing unit 103 that decodes the received video data transmitted from the image receiving unit 3 and an image quality value reliability determination processing unit 104 that determines the reliability of the image quality evaluation result transmitted from the image receiving device 3. The

  The image receiving device 3 has an image decoding processing unit 301 that decodes the received video data, an image quality evaluation processing unit 302 that evaluates the image quality of the received video data and transmits the received image data to the image sending device 1, and received video data. And a received image encoding processing unit 303 that encodes the image at a predetermined time interval and transmits the encoded image to the image transmission apparatus 1.

  The image receiving device 3 may be in the form of a receiving terminal used by individual viewers who view the transmitted video data, or a home gateway installed at the entrance of the home network of the receiving home. Form may be sufficient.

  The input original image is encoded by the image encoding processing unit 101, and the encoded video data is transmitted to the image receiving device 3 via the transmission path 2. The transmitted encoded image (video data) is decoded by the image decoding processing unit 301 to obtain received video data. The received encoded image or decoded received video data is sent to the image quality evaluation processing unit 302, and the image quality of the received video data is evaluated. In this evaluation, the image quality is evaluated by the Reduced Reference method or the No Reference method. When the evaluation is performed using the Reduced Reference method, the image encoding processing unit 101 extracts, encodes, and transmits the feature amount of the original image in addition to encoding and transmitting the original image. The image quality value obtained by the image quality evaluation processing unit 302 is sent back to the image quality evaluation result totaling processing unit 102 of the image transmission device 1 via the transmission path 2, so that the image transmission device 1 is received by the image reception device 3. Grasp the image quality of received images (received video data).

  The received image encoding processing unit 303 transmits to the image sending apparatus 1 as a video frame obtained by encoding one frame or a plurality of frames or a part of an image of the received video data at a predetermined time interval. At this time, the video frame is transmitted using encoding by lossless compression or encoding by lossy compression so that the compression rate is such that the image quality of the received image is not impaired. The time interval specified in advance is determined by the characteristics of the video and the state of the transmission path 2. The interval may not be constant and may be random. For example, when it is desired to evaluate the image quality with higher accuracy, or when there is a margin in the load of the image sending device 1, the transmission path 2, and the image receiving device 3, the interval is controlled to be short. You may make it control so that may be lengthened.

  The image sending device 1 decodes the received video data (video frame in this example) received from the image receiving terminal 3 by the image decoding processing unit 103 and restores the video frame information received by the image receiving device 3. . The restored video frame is sent to the image quality value reliability determination processing unit 104, and the image quality is evaluated on the image sending device by comparing with the video frame of the original image whose playback time matches the frame. Since the image quality reliability determination processing unit 104 can refer to the original image data, it is possible to evaluate the image quality with relatively high accuracy by the Full Reference method.

  At this time, it is possible to reduce the load on the transmission path 2 by transmitting information of a part of the frame without transmitting the information of the entire frame. In addition, a feature amount representing the feature of the received video data may be used as information on a part of the frame.

  In this case, it is possible to prevent deterioration in image quality evaluation accuracy in the image sending apparatus 1 by changing the portion of the video frame to be transmitted each time the received video data is transmitted. It is also possible to maintain image quality evaluation accuracy by selecting and transmitting a video region in which deterioration is easily noticeable or a video region in which the generated deterioration is likely to propagate through subsequent frames.

  Note that when the received image encoding processing unit 303 extracts the feature amount of the received image without encoding the video frame itself, encodes it, and transmits it to the image sending apparatus 1, the image quality value reliability determination processing unit 104 The image quality is evaluated by the reduced reference method using the original image frame and the feature amount of the received image. The image quality value obtained here is compared with the result of image quality evaluation performed by the image receiving device 3 sent from the image receiving device 3, and the image quality evaluation result sent from the image receiving device 3 is reasonable. It is determined whether or not. For example, if there is no correlation between the image quality evaluation result in the image transmission device 1 and the image quality evaluation result in the image reception device 3, it can be understood that the evaluation result in the image reception device 3 is not reliable.

(Second Embodiment)
Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

  The second embodiment is characterized in that transmission of received video data from the image receiving device 3 to the image sending device 1 is performed in non-real time. By performing non-real time transmission, it is possible to prevent load concentration on the image sending apparatus 1 and the transmission path 2.

  FIG. 2 shows the configuration of the second embodiment. The difference from the first embodiment shown in FIG. 1 is the presence / absence of the image quality evaluation result accumulation processing unit 405 and the received image data accumulation processing unit 504. As the received video data to be transmitted to the image sending device 1, the video frames are not sent in real time, but are once stored in the received image data storage processing unit 504, and are transmitted in a time zone where the load on the image sending device 1 and the transmission path 2 is not high. .

  In the image sending device 1, the image quality evaluation result in the image receiving device 3 that is always sent is stored in the image quality evaluation result storage processing unit 405, and every time the information of the received image is sent from the image receiving device 3, the image sending device 1 The sending apparatus 1 also performs image quality evaluation, and determines whether or not the image quality evaluation result sent from the image receiving apparatus 3 and stored is appropriate.

(Third embodiment)
Next, a third embodiment of the present invention will be described in detail with reference to the drawings.

  In the third embodiment, when the transmission of video data is not one-to-one transmission but one-to-many transmission, the video of the received video data from the image receiving apparatus to the image sending apparatus as shown in FIG. It is characterized in that the frame is transmitted not from all the image receiving apparatuses but only from a predetermined image receiving apparatus. With such a configuration, it is possible to prevent an increase in image quality evaluation processing load in the image transmission apparatus.

  Also, as shown in FIGS. 3 and 4, the received image information from many image receiving apparatuses is changed by changing the image receiving apparatus that transmits the received video data at each timing of transmitting the received video data. Therefore, it is possible to determine whether or not the image quality evaluation results in many image receiving apparatuses are appropriate.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described in detail with reference to FIGS.

  In the fourth embodiment, the image evaluation apparatus shown in the first embodiment described above is realized by a computer system.

  FIG. 5 shows an image transmission system in the computer system according to the fourth embodiment. Referring to FIG. 5, the system is equipped with a program control processor 51. In addition to the input data buffer 52 and the output data buffer 53, the program control processor 51 is connected to a program memory 54 that stores necessary programs. The program module stored in the program memory 54 includes an image encoding process 55, an image quality evaluation result totaling process 56, an image decoding process 57, and an image quality value reliability determination process 58 in addition to the main program. The main program is a main program that executes the program module. The program modules of the image encoding processing 55, the image quality evaluation result totaling processing 56, the image decoding processing 57, and the image quality value reliability determination processing 58 are the image encoding processing unit 101, the image quality evaluation totaling processing unit 102, and the image decoding described above. The image processing unit 103 and the image quality reliability determination unit 104 are functionally realized.

  FIG. 6 shows an image receiving system that receives video data and estimates image quality in a computer system according to the fourth embodiment. The image receiving system is equipped with a program control processor 61. In addition to the input data buffer 62 and the output data buffer 63, the program control processor 61 is connected to a program memory 64 that stores necessary programs. The program module stored in the program memory 64 includes an image decoding process 65, an image quality evaluation process 66, and a received image encoding process 67 in addition to the main program. The main program is a main program that decodes received video data and executes image quality evaluation processing. The program modules of the image decoding process 65, the image quality evaluation process 66, and the received image encoding process 67 function the above-described image decoding process unit 301, image quality evaluation process unit 302, and received image encoding process unit 303, respectively. Realize. By executing the main program and each functional module of the image transmission system and the image reception system by the program control processor 51 and the program control processor 61, the image quality evaluation processing according to the present invention is executed.

  In the present embodiment, an example in which the configuration of the first embodiment is realized in a computer system has been described. However, the second and third embodiments of the present invention can be similarly realized by a computer.

  Next, the configuration / function / operation of the present invention will be described using specific embodiments.

  In this embodiment, moving image data of SDTV size (horizontal 720 pixels, vertical 480 pixels, 29.97 frames per second) is input to the image sending apparatus 1 shown in FIG. 1 as an original image. Here, the image encoding device 101 shown in FIG. 1 encodes moving image data by the MPEG-2 encoding method into video data. Further, when an original image encoded in advance is input to the image sending device 1, the image encoding processing unit 101 does not need to perform further encoding.

  The encoded moving image (video data) is transmitted to the image receiving device 3 via the transmission path (network) 2. In the image receiving device 3 that has received the video data, the video data encoded by the MPEG-2 method is decoded by the image decoding processing unit 301, returned to the video frame, and viewed by the viewer.

  At this time, the received video data or the decoded video frame is sent to the image quality evaluation processing unit 302, and the image quality evaluation processing unit 302 evaluates the image quality of the received video data. For example, image quality evaluation is performed by a method such as disclosed in Patent Document 2 (Japanese Patent Laid-Open No. 2001-25014) in which the number of samples that could not be correctly decoded is used as an image quality evaluation value. It is assumed that half of the pixels cannot be decoded correctly.

  That is, 50% of pixels are correctly decoded, and this value is an image quality score (image quality evaluation result) output from the image quality evaluation processing unit 302.

  This image quality score is transmitted to the image sending apparatus 1 via the transmission path 2. The transmitted image quality score is received by the image quality evaluation result totaling processing unit 102 of the image sending device 1, and the image sending device 1 grasps the received image quality on the image receiving device 3.

  On the other hand, in the image receiving device 3, for example, a video frame is encoded by the received image encoding processing unit 303 at an interval of once every 5 seconds and transmitted to the image sending device 1 via the transmission path 2. At this time, it is assumed that the received image encoding processing unit 303 encodes the received frame using the JPEG method with a low compression rate. The video frame encoded and transmitted in this way is decoded by the image decoding processing unit 103 into data encoded by the JPEG method and restored to frame data. The restored image frame is subjected to image quality evaluation again by the image quality value reliability determination processing unit 104 by comparing with the original image frame corresponding to the image frame. As a result of the image quality evaluation here, it is assumed that the difference between the original image frame and the restored video frame is larger than the threshold value in half of the pixels in one frame. Since this result matches the image quality score in the image receiving device 3 received by the image quality evaluation result totaling processing unit 102, it can be determined that the image quality evaluation result in the image receiving device 3 is reliable. On the other hand, when the difference is smaller than the threshold value, it is determined that the image quality evaluation result of the image receiving device 3 is not reliable. This process is performed every 5 seconds, and the reliability of the image quality evaluation in the image receiving device 3 is verified.

  Further, this embodiment is merely an example. In this example, the video data transmitted through the transmission path 2 is moving image data, but may of course be still image data. In this case, the received video data transmitted by the image receiving device 3 may be a part of the received still image data.

  When network communication quality data on the transmission path 2 can be obtained, the network communication quality data can also be used for reliability evaluation of image quality in the image sending apparatus 1. By using this network communication quality data, it is possible to use it for reliability evaluation of image quality evaluation results. Further, by comparing the network communication quality data and the image quality evaluation result, it is possible to determine whether the cause of the image quality degradation is in the transmission path 2 or in the image receiving device 3.

  Further, in the transmission path 2, the physical networks of the upstream (image receiving apparatus 3 to image transmitting apparatus 1) and the downstream (image transmitting apparatus 1 to image receiving apparatus 3) are different or use different protocols. good. In this case, it is better that the downstream communication band is larger than that of the upstream, and it is desirable to use the upstream communication quality that has been compensated to some extent.

  As described above, the first invention described in the present embodiment is an image quality evaluation system in which an image reception device receives video data transmitted from an image transmission device and evaluates the image quality of the video data. The image receiving device decodes the received video data, and transmits the decoded received video data to the image sending device at a predetermined time interval. The image output device uses the received video data. An image quality evaluation system characterized by performing image quality evaluation.

  According to a second aspect of the present invention, there is provided an image quality evaluation system in which the image receiving apparatus receives the video data transmitted from the image transmitting apparatus and evaluates the image quality of the video data, and the image receiving apparatus receives the received video data. The decoded received video data and the image quality evaluation result obtained by evaluating the image quality of the received video data are transmitted to the image transmission device at a predetermined time interval, and the image output device An image quality evaluation system that performs image quality evaluation of the received image data using the received image data and the image quality evaluation result.

  According to a third aspect of the present invention, in the above invention, the image quality evaluation performed by the image transmission device can grasp the reliability of the image quality evaluation result of the image reception device.

  The fourth invention is characterized in that, in the above invention, the received video data is an arbitrary video frame of the received video data.

  The fifth invention is characterized in that, in the above invention, the received video data is a part of the video frame in an arbitrary video frame of the received video data.

  The sixth invention is characterized in that, in the above invention, the received video data is a video feature amount representing a feature of the received video data.

  The seventh invention is characterized in that, in the above invention, the timing at which the image receiving device transmits the received video data to the image sending device is sent in non-real time.

  According to an eighth aspect of the present invention, in the above invention, there are a plurality of the image receiving devices, the image sending device transmits video data to each of the image receiving devices, and a part of the plurality of the image receiving devices exists. At least the received video data is transmitted to an image sending device.

  According to a ninth aspect of the present invention, there is provided an image quality evaluation system in which an image receiving apparatus receives encoded video data transmitted from an image transmitting apparatus via a network and evaluates the image quality of the received video data. The image receiving apparatus receives video data encoded via a network, performs an image decoding processing unit for decoding the video data, performs image quality evaluation of the received video data, and sends an image quality evaluation result An image quality evaluation processing unit, and a received image encoding processing unit that encodes an arbitrary video frame of the received video data decoded by the image decoding processing unit and transmits the video frame at a predetermined time interval, The image transmission device receives the image quality evaluation result and the video frame via a network, and decodes the encoded video frame; An image quality evaluation reliability determination unit that evaluates the reliability of the image quality evaluation result of the image receiving device by comparing the received video frame with the image quality evaluation result. Is an image quality evaluation system.

  According to a tenth aspect of the present invention, there is provided an image quality evaluation system for evaluating an image quality of received video data by an image reception device receiving the encoded video data transmitted from the image transmission device via a network. An image sending device, which receives video data received by the image receiving device from the image receiving device and an image quality evaluation result of the video data received by the image receiving device, and receives the video data and the image quality evaluation An image transmission device of an image quality evaluation system comprising an image quality evaluation reliability determination unit that evaluates reliability of the image quality evaluation result of the image reception device by comparing the result .

  According to an eleventh aspect of the invention, there is provided an image quality evaluation system that receives image data transmitted from an image transmission apparatus and received by an image reception apparatus via a network, and evaluates the image quality of the received video data. An image receiving device that performs image quality evaluation of received video data, sends an image quality evaluation result to the image sending device, encodes an arbitrary video frame of the decoded received video data, An image receiving apparatus for an image quality evaluation system, comprising: a received image encoding processing unit that transmits the image to the image transmitting apparatus at a predetermined time interval.

  A twelfth aspect of the invention is an image quality evaluation method in which the image receiving device receives the video data sent from the image sending device and evaluates the image quality of the video data, and the image receiving device receives the received video data. The decoded image data is transmitted to an image transmission device at a predetermined time interval, and the image output device performs image quality evaluation using the received image data. It is an evaluation method.

  A thirteenth aspect of the invention is an image quality evaluation method in which the image receiving device receives the video data sent from the image sending device and evaluates the image quality of the video data, and the image receiving device receives the received video data. The decoded received video data and the image quality evaluation result obtained by evaluating the image quality of the received video data are transmitted to the image transmission device at a predetermined time interval, and the image output device The image quality evaluation method is characterized in that image quality evaluation of the received video data is performed using the received video data and the image quality evaluation result.

  According to a fourteenth aspect of the present invention, there is provided an image quality evaluation program for receiving video data sent from an image sending device and evaluating the image quality of the video data, wherein the image receiving device receives the received video data. So that the decoded received video data is transmitted to the image transmission device at a predetermined time interval, and the image output device performs image quality evaluation using the received video data. It is an image quality evaluation program characterized by functioning.

  The fifteenth aspect of the invention is an image quality evaluation program for receiving video data sent from an image sending device and for evaluating the image quality of the video data, wherein the image receiving device receives the received video data. And decoding the received video data at a predetermined time interval and the image quality evaluation result obtained by evaluating the image quality of the received video data to function to transmit to the image sending device, The image output device is an image quality evaluation program that functions to perform image quality evaluation of the received video data using the received video data and the image quality evaluation result.

This application claims the priority on the basis of Japanese application Japanese Patent Application No. 2007-75110 for which it applied on March 22, 2007, and takes in those the indications of all here.

Claims (15)

An image receiving device that receives video data sent from an image sending device and evaluates the image quality of the video data,
The image receiving device decodes the received video data, and transmits the decoded received video data to the image sending device at a predetermined time interval,
The image output device performs image quality evaluation using the received video data. An image receiving device that receives video data sent from an image sending device and evaluates the image quality of the video data,
The image receiving apparatus decodes the received video data, and sends out the decoded received video data and an image quality evaluation result obtained by evaluating the image quality of the received video data at a predetermined time interval. To the device,
The image output device performs image quality evaluation of the received video data using the received video data and the image quality evaluation result.   The image quality evaluation system according to claim 2, wherein the image quality evaluation performed by the image transmission apparatus can grasp the reliability of the image quality evaluation result of the image reception apparatus.   The image quality evaluation system according to any one of claims 1 to 3, wherein the received video data is an arbitrary video frame in the received video data.   The image quality evaluation according to any one of claims 1 to 3, wherein the received video data is a part of the video frame in an arbitrary video frame of the received video data. system.   The image quality evaluation system according to any one of claims 1 to 3, wherein the received video data is a video feature amount representing a feature of the received video data.   The image quality evaluation system according to any one of claims 1 to 6, wherein the timing at which the image receiving device transmits the received video data to the image transmitting device is transmitted in non-real time. A plurality of the image receiving devices, and the image sending device transmits video data to each image receiving device;
8. The image quality evaluation system according to claim 1, wherein a part of the plurality of image receiving apparatuses transmits at least the received video data to the image transmitting apparatus. 9. An image quality evaluation system that receives image data transmitted from an image transmission apparatus and received by an image reception apparatus via a network, and evaluates the image quality of the received video data,
The image receiving device includes:
An image decoding processor that receives video data encoded via a network and decodes the video data;
An image quality evaluation processing unit that performs image quality evaluation of the received video data and sends the image quality evaluation result;
A received image encoding processing unit that encodes an arbitrary video frame of the received video data decoded by the image decoding processing unit and transmits the encoded video frame at a predetermined time interval;
The image sending device includes:
An image decoding processing unit that receives the image quality evaluation result and the video frame via a network and decodes the encoded video frame;
An image quality evaluation reliability determination unit that evaluates the reliability of the image quality evaluation result of the image receiving device by comparing the decoded video frame and the image quality evaluation result;
An image quality evaluation system comprising: An image transmission device for an image quality evaluation system that receives image data transmitted from an image transmission device and received by an image reception device via a network, and evaluates the image quality of the received video data,
By inputting the video data received by the image receiving device from the image receiving device and the image quality evaluation result of the video data received by the image receiving device, and comparing the video data and the image quality evaluation result An image transmission apparatus for an image quality evaluation system, comprising: an image quality evaluation reliability determination unit that evaluates reliability of the image quality evaluation result of the image reception apparatus. An image receiving apparatus for an image quality evaluation system that receives image data transmitted from an image transmission apparatus and received encoded image data via a network, and evaluates the image quality of the received video data,
An image quality evaluation processing unit that performs image quality evaluation of the received video data and transmits an image quality evaluation result to the image transmission device;
A received image encoding processing unit that encodes an arbitrary video frame of the decoded received video data and transmits the video frame to the image transmission device at a predetermined time interval;
An image receiving apparatus for an image quality evaluation system. An image quality evaluation method for receiving image data sent from an image sending device and receiving the image data and evaluating the image quality of the image data,
The image receiving device decodes the received video data, and transmits the decoded received video data to the image sending device at a predetermined time interval,
The image output device performs image quality evaluation using the received video data. An image quality evaluation method for receiving image data sent from an image sending device and receiving the image data and evaluating the image quality of the image data,
The image receiving apparatus decodes the received video data, and sends out the decoded received video data and an image quality evaluation result obtained by evaluating the image quality of the received video data at a predetermined time interval. To the device,
The image output device performs image quality evaluation of the received video data using the received video data and the image quality evaluation result. An image quality evaluation program for receiving video data sent from an image sending device and evaluating the image quality of the video data,
The image receiving device decodes the received video data and functions to transmit the decoded received video data to the image sending device at a predetermined time interval,
An image quality evaluation program causing the image output device to function to perform image quality evaluation using the received video data. An image quality evaluation program for receiving video data sent from an image sending device and evaluating the image quality of the video data,
The image receiving apparatus decodes the received video data, and sends out the decoded received video data and an image quality evaluation result obtained by evaluating the image quality of the received video data at a predetermined time interval. Function to send to the device,
The image output device causes the image output device to function to perform image quality evaluation of the received video data using the received video data and the image quality evaluation result.

Images