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Method and device for evaluating image quality of video sequence

An image quality assessment, video image technology, applied in image communication, digital video signal modification, television and other directions, can solve the problems of long time, not suitable for video images, not applicable

Inactive Publication Date: 2012-08-29
CHINA MOBILE COMM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Subjective evaluation is to directly use the observer's direct reflection on the quality of the measured image to evaluate the image quality. The shortcomings of subjective evaluation are time-consuming, high cost, poor stability and portability, so it is not suitable for real-time video Image quality assessment; and the current mainstream methods of objective measurement include full-reference frame (FR, Full-Reference) measurement method, half-reference frame (RR, Reduced-Reference) measurement method and no-reference frame (NR, No-Reference) measurement method Wait
[0004] In the prior art, the above two evaluation schemes are mainly applicable to standard-definition video images (SD: 720×540 resolution) or high-definition video images (HD: 1920×1080 resolution), but not applicable to H.264 and AVS The format obtained after standard compression coding is QVGA format, and the resolution is only 320×240 mobile phone TV video images

Method used

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  • Method and device for evaluating image quality of video sequence
  • Method and device for evaluating image quality of video sequence

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Experimental program
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Embodiment 1

[0049] In the auto.yuv sequence, there is a jump between the 125th frame image and the 126th frame image (the jump here refers to the large difference in the content of the adjacent two frame images), and, from the 127th frame image, it begins to appear repeatedly The video image that appears from the first frame image, that is, the 127th frame image is the same as the first frame image, the 128th frame image is the same as the first frame image, and so on.

[0050] In Embodiment 1 of the present invention, the specific flow chart of evaluating the image quality of the images in the auto.yuv sequence by using the video image quality evaluation method provided by the embodiment of the present invention is as follows: Figure 2a As shown, it mainly includes the following steps:

[0051] Step 21, for each frame image in the auto.yuv sequence, respectively determine the number of intra-coded macroblocks in each frame image, specifically, for any frame image, first determine all ty...

Embodiment 2

[0059] In the branch.yuv sequence, the picture formed by each frame image in this sequence is actually a close-up picture gradually pushed from the panoramic picture in the first frame image to the close-up picture in the 150th frame image, that is, the 150th frame image is actually the first A close-up close-up of a small frame in a frame image, the branch.yuv sequence is characterized by small differences between images in adjacent frames.

[0060] In Embodiment 2 of the present invention, the specific flowchart of evaluating the image quality of the images in the branch.yuv sequence by using the video image quality evaluation method provided by the embodiment of the present invention is as follows: Figure 3a As shown, it mainly includes the following steps:

[0061] Step 31, for each frame image in the branch.yuv sequence, respectively determine the number of intra-coded macroblocks in each frame image, and in Embodiment 2 of the present invention, the statistics of each f...

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Abstract

The invention discloses a method and a device for evaluating image quality of a video sequence, and the method and device provided disclosed by the invention are used for providing a scheme suitable for evaluating the quality of a video image of a mobile TV (television). The method comprises the following steps: respectively confirming the number of interior coded macro-blocks of each frame videoimage in a video sequence to be evaluated, and respectively confirming the severity value of each frame video image; and evaluating the quality of each frame video image by utilizing the number of the interior coded macro-blocks and the severity values.

Description

technical field [0001] The invention relates to the technical field of computer and communication, in particular to a method and device for evaluating image quality of a video sequence. Background technique [0002] In the field of image compression codec, there are many compression codec standards such as H.264, MPEG-2, MPEG-4, JPEG2000, AVS, etc. Under the premise of image quality, a high compression ratio can be achieved, but it is inevitable that different degrees of image quality damage will be introduced under the high compression ratio. These damages mainly include block effects, image blur, noise, and chromaticity distortion. , ringing, etc., and in order to evaluate the quality of images with damage, the prior art mainly adopts two evaluation schemes, subjective evaluation and objective measurement. [0003] Subjective evaluation is to directly use the observer's direct reflection on the quality of the measured image to evaluate the image quality. The shortcomings ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N17/00H04N7/26H04N19/154
Inventor 梅海波
Owner CHINA MOBILE COMM GRP CO LTD