Method for extracting video subtitling

A subtitle and video technology, which is applied in the field of video subtitle extraction, can solve the problems of poor text contrast and limited adaptability, and achieve high recognition rate, improved subtitle recognition results, and good binarization effect

Inactive Publication Date: 2009-11-18
PEKING UNIV
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the effect of extracting the subtitle area with complex background and weak text contrast is poor.
Therefore, the scope of application is not wide, and the extraction effect of video subtitles needs to be improved.

Method used

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  • Method for extracting video subtitling

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0025] In this embodiment, firstly, the subtitle area in the video is detected by a method for locating the video subtitle area, and then the video subtitle extraction method of the present invention is used to extract the subtitle. Of course, the method of the present invention can also be used to extract subtitles from video subtitle regions obtained by any other existing methods.

[0026] 1. Video subtitle area detection, including:

[0027] (1) Extract the video frame and convert the video frame into an edge intensity map.

[0028] Use the improved Sobel edge detection operator to calculate the edge intensity value of each pixel, the formula is as follows:

[0029] S=Max(|S H |, |S V |, |S LD |, |S RD |)

[0030] Among them, S H , S V , S LD , S RD Respectively represent the Sobel edge strength values ​​in the four dire...

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Abstract

The invention provides a method for extracting video subtitles, which belongs to the technical field of video analysis and retrieval. The method comprises the following steps: (1) carrying out subtitle color judgment based on connected area statistics to the video subtitle area, confirming whether the subtitle color is dark or light, and reversing the gray scale picture of the light subtitle simultaneously to be the dark subtitle picture; 2) Binarize the grayscale image obtained in step (1) based on local window analysis; (3) perform OCR software recognition to extract subtitle text results. Compared with the existing method, the present invention uses the subtitle text color judgment and the local threshold method, which can achieve better binarization effect. The present invention can also firstly adjust the gray value of the subtitle area, and perform peripheral fusion and denoising on the obtained binarized picture, thus further improving the subtitle recognition result of the present invention.

Description

technical field [0001] The invention belongs to the technical field of video analysis and retrieval, and in particular relates to a method for extracting video subtitles. Background technique [0002] With the continuous increase of Internet video content, and a large number of multimedia applications such as digital library, video on demand, distance teaching, etc., how to retrieve the required information from the massive video is very important. Traditional video retrieval based on keyword description cannot meet the needs of mass video retrieval due to limited description ability, strong subjectivity, manual annotation and other reasons. Therefore, since the 1990s, content-based video retrieval technology has become a hot topic of research, and the recognition technology of video subtitles is the key technology to realize video retrieval. If the subtitle information in the video can be automatically recognized, efficient Text index structure, so as to realize video retr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/278G06K9/32
Inventor 李鸿彭宇新肖建国
Owner PEKING UNIV
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