Now Video OCR systems. Another problem is the existence

Now a days digital video is very popular as an exchange medium
due to large improvement in video recording and compression techniques and
increasing of network-speed. Therefore audiovisual recordings are used more frequently
in e-learning and e-lecturing systems. OCR from videography is a technique that
can locate any text inside a digital video file via reading and  automatic extraction of any notes and captions
that gives the actual information (like – the names of people, places or
description of objects etc.) about the video being presented. Detecting the video-content
requires many technologies: image detection, language processing, search
strategies, video segmentation and filtration etc. Reading the extracted notes
and captions gives more appropriate information to understand the video-content.
Applying OCR on video and combining the results with various detecting techniques
can improve the detection result. Although integrated character recognition in
text-based videos is needed greatly.

                There
are various research fields which concern
character recognition of videos. In character extraction from
the car license plate using video images is presented and
characters in scene images are segmented and recognized
based adaptive thresholding. While these results are related,
character recognition for the video presents its own
difficulties because of different conditions of title character
size and complex backgrounds. In video caption resolution
of character is lower and the background complexity is
more severe than in other research. The first problem is low
resolution of the characters. The size of an image is limited
by title number of scan lines defined in the National Television System
Committee (NTSC) standard. A character of the video caption is small to avoid
occlusion of interesting objects such as people’s faces. Therefore, the resolution
of characters in the video caption is insufficient to implement stable and
robust Video OCR systems. Another problem is the existence of complex
backgrounds. Characters superimposed on videos often have hue and brightness
similar to the background, making extraction extremely difficult. These
problems in video OCR have opened an area for research.
OCR from videography is a technique that can greatly help to locate the topics
of interest in a large digital video via the automatic extraction and reading
of captions and annotations.

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