Digital video processing
Motion Analysis and Image Sequence Processing (The International Series in Engineering and Computer Science)
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Professional film scanners acting in real time (24 frames per second) are still very expensive. In most cases using a slide scanner of medium resolution equipped with additional device for transporting a film reel would be a reasonable solution. The main problem, however is a lack of accurate positioning mechanism in such sort of scanners. Therefore the position of each frame could be to some extent accidental. If frames are scanned separately from each other and this process is performed for all the frames of a movie there is usually a significant jitter in this sequence. This paper presents an efficient and simple method of obtaining jitter-free sequence i.e. finding the precise cinematic frame location in a picture that is the output of the scanning process. The procedure consists of two steps: rough estimation and the fine one. During the rough step the borders of the frame can be detected based on finding area of maximal brightness. In the second step the displacements among frame backgrounds are calculated. Additionally in order to avoid the fixed background problem the local constant component is eliminated in the postprocessing phase. As a final result a jitter is removed almost completely.