Patent Document ID: 7787705
Application ID: 10737209
Patent Status: 1

Claim One:
1. A text change frame detection apparatus that selects a plurality of video frames including text contents from given video frames, said apparatus comprising: a first frame removing unit to remove redundant video frames from the given video frames; a second frame removing unit to remove video frames that do not contain a text area from the given video frames; a third frame removing unit to detect and remove redundant video frames caused by image shifting from the given video frames; and an output unit to output remaining video frames as candidate text change frames, wherein the second frame removing unit includes: a fast and simple image binarization unit to generate a first binary image of a video frame of the given video frames; a text line region determination unit to determine a position of a text line region by using a horizontal projection and a vertical projection of the first binary image; a rebinarization unit to generate a second binary image of every text line region; a text line confirmation unit to determine validity of a text line region by using a difference between the first binary image and the second binary image and a fill rate of a number of foreground pixels in the text line region to a total number of pixels in the text line region; and a text frame verification unit to confirm whether a set of continuous video frames are non-text frames that do not contain a text area by using a number of valid text line regions in the set of continuous video frames.