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Method for precisely detecting video and audio synchronous errors of video and audio processing system

A processing system and audio synchronization technology, which is applied to whether the audio is synchronized, accurately measures the synchronization error, and judges the video field. It can solve the problems of insufficient synchronization error accuracy, limited subjectivity, and inability to judge synchronization, achieving high precision and avoiding subjectivity. Effect

Active Publication Date: 2013-04-17
BEIJING DAYANG TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has the following disadvantages: the judgment of video and audio synchronization is limited by human subjectivity, some people think it is synchronized, but some people think it is out of sync; when out of sync occurs, the synchronization error cannot be given quantitatively, Or the accuracy of the synchronization error is not enough; when the synchronization error is less than the subjectively recognizable threshold, it is impossible to judge whether it is synchronized

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  • Method for precisely detecting video and audio synchronous errors of video and audio processing system
  • Method for precisely detecting video and audio synchronous errors of video and audio processing system
  • Method for precisely detecting video and audio synchronous errors of video and audio processing system

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Embodiment 1

[0019] This embodiment is a method for accurately detecting video and audio synchronization errors of an audio-visual processing system. The hardware system used in the method includes: a signal generating unit connected to the input end of the video-audio system under test composed of at least one subsystem connected in series , the output end of the video and audio system under test is connected to the signal detection unit, such as figure 1 shown. The system described in this embodiment includes: a signal generating unit connected to the input end of the tested video and audio system composed of at least one subsystem connected in series, and the output end of the tested video and audio system is connected to the signal detection unit. The signal generating unit includes: a video sequence generating device generating a series of video frame numbers and an audio sequence generating device generating a series of audio frame numbers having the same sequence number as the video...

Embodiment 2

[0030] This embodiment is an improvement of the first embodiment, and is a refinement of the method for calculating the synchronization error in the first embodiment. The method for calculating the synchronization error described in this embodiment is the frame number timing method, and the steps for calculating the synchronization error by the frame number timing method are as follows:

[0031] Record the frame number vi, aj of each video frame and audio frame, and record the occurrence time of each video frame and audio frame , ;

[0032] Find the video frame vn and audio frame an with the same frame number, and set the appearance time of the video frame vn Subtracts the occurrence time of the audio frame an The difference formed by is the synchronization error T. For example, the video frame v150 appears at 2 minutes 40 seconds 35 milliseconds, and the audio frame a150 appears at 2 minutes 40 seconds 38 milliseconds. Synchronization error is equal to -3 millisecond...

Embodiment 3

[0034] This embodiment is an improvement of the first embodiment, and is a refinement of the method for calculating the synchronization error in the first embodiment. The method for calculating the synchronization error described in this embodiment is the frame number comparison method. The steps of calculating the synchronization error by the frame number comparison method are as follows:

[0035] Take the time when a certain video frame vi appears as the time point, detect the frame number aj of the audio frame at this time, and at the same time detect the audio sampling point at this time is the first sampling point of the audio frame, which is recorded as ; The calculation formula of the synchronization error T is . Taking the time when the video frame v150 appears as the time point, it is detected that the frame number of the audio frame at this time is a149, and at the same time it is detected that the audio sampling point at this time is the 20th sampling point of t...

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Abstract

The invention relates to a method for precisely detecting video and audio synchronous errors of a video and audio processing system. The method comprises the following steps of generating synchronous detection sequences by using frame numbers; inputting the synchronous detection sequences into the detected video and audio system; receiving the processed output sequences from the detected video and audio system; and calculating the synchronous errors according to the received synchronous detection sequences. According to the method, firstly, the frame numbers are utilized for generating the synchronous detection sequences, then, the synchronous detection sequences are input into the detected video and audio system, the frame numbers of the video frame and the audio frame are recovered in the output synchronous detection sequences by using the detecting technology at the output side of the detected video and audio system, and the synchronous errors are calculated by using the relationship between the frame number and the time. The method provided by the invention can be used for objectively and quantitatively analyzing the video and audio synchronous errors, the subjectivity caused by subjective judgment method is avoided, and the measured synchronous errors have higher precision.

Description

technical field [0001] The invention relates to a method for accurately detecting video and audio synchronization errors of a video and audio processing system, which is an electronic detection method, a method for judging whether the video and audio are synchronous, and a method for accurately measuring the synchronization error. Background technique [0002] A film and television program usually consists of video and audio, and video content and audio content usually have a certain corresponding relationship in plot. For example, when a news host is broadcasting news, his voice corresponds to his mouth shape, that is, the video and audio are synchronized. If the sound is ahead of the video content or lags behind the video content, the video and audio are out of sync. [0003] From the source to the audience, a program has to go through many links, such as program collection, program editing, program broadcasting, and so on. Here, each link is referred to as an audio-visu...

Claims

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Application Information

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IPC IPC(8): H04N17/00
Inventor 隗功赛王雨王付生
Owner BEIJING DAYANG TECH DEV